Academic literature on the topic 'Operation based on technical condition'
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Journal articles on the topic "Operation based on technical condition"
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SAKNO, O. P., and T. M. KOLESNIKOVA. "VARIABILITY MANAGEMENT OF EFFICIENT VEHICLE OPERATION BASED ON FUNCTIONAL RESONANCE ANALYSIS METHOD." Ukrainian Journal of Civil Engineering and Architecture, no. 1 (June 24, 2021): 80–88. http://dx.doi.org/10.30838/j.bpsacea.2312.230221.80.721.
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Raising of problem. The methodology presented in this study is aimed at modeling the variability of the technical condition when operating a car in a complex social and technical system "car − person − environment". This allows you to simulate the change in the operational properties of the car depending on its operation, affecting the change in the technical condition by the Functional Resonance Analysis Method (FRAM). Purpose. The variability of the technical operation of the car needs to be managed, and not reduced or eliminated, since this is an advantage, as well as conditions for the safety and functioning of complex socio-technical systems. To control it, you must first monitor the variability of the vehicle's technical operation. A set of relevant indicators needs to be identified and developed. Their interpretation makes it possible to draw conclusions about the level of technical condition, operational properties of the vehicle and traffic safety and supports the prediction of the occurrence of future events (failure occurrence). Conclusion. Thus, the basic principles of the FRAM for modeling the variability of the technical condition when operating a car in a complex social and technical system "car − person − environment" have been determined. The relationship has been established between the definition of traffic safety, the FRAM model and the performance indicators of the vehicle. The developed model of the FRAM for maintenance of the undercarriage of cars, consisting of a set of functions that describe the actions taken to maintain cars to ensure their good condition. A block diagram of the implementation of functionally oriented technologies for the maintenance and repair of cars has been developed, taking into account the design features and the level of technology for technical influences. This allows you to objectively determine the required scope of maintenance work, depending on the results of diagnostics and the availability of technological equipment.
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Grądzki, Rafał. "Parametric evaluation of the technical object suitability based on analyze the quality of its maintenance and use taking into account the initial conditions." MATEC Web of Conferences 182 (2018): 01006. http://dx.doi.org/10.1051/matecconf/201818201006.
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In this paper, the comparison of three various technical objects (engines of public transport buses) exploitation research for different initial conditions are presented. Object researches were carried out in 2012 and then repeated in 2013. Gathered operational data is presented in three sets (1 – concerning object, 2 – concerning driving conditions, 3 – concerning driver, where set 1 is the collection of diagnostic information Dk, and sets 2 and 3 are the information about object environment U) in form of conventional points (experts numerical assessments). Relation between point information of object and point information of environment was described by coupled equations of state (describing relations between operation condition and technical condition including initial conditions for each analyzed exploitation period). That method allows to determine parameters of technical condition aT and operation condition aR and next, from the course of aT parameter, set of parametrical damage mT(t) and from course of parameter aR – set of momentary damage aR(t). Thus it is possible to evaluate exploitation, technical and operation conditions of each object (bus engine). Received reliability parameters allows to properly control exploitation and service of particular objects and set of objects (fleet of buses) and its elements.
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Kuzin, Evgeny, Vladimir Bakin, and Dmitriy Dubinkin. "Mining Equipment Technical Condition Monitoring." E3S Web of Conferences 41 (2018): 03020. http://dx.doi.org/10.1051/e3sconf/20184103020.
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The Earth, being the main object and operational basis for mining, is exposed to the greatest impact because of extracting minerals. Protection of elements of the biosphere, including subsoil, should provide for the provision of scientifically based and economically justified completeness and complexity of use. The article discusses the need to monitor the technical condition of mining equipment, as applied to assessing its technical condition and reducing energy consumption by this equipment. The dependence of energy consumption on vibration parameters and temperature of equipment surfaces is shown. The data of the results of vibration parameters monitoring are given. Criteria are given for estimating the energy efficiency of operation of process equipment and, accordingly, the influence of these parameters on the environment.
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Levin, Vladimir M., and Ammar A. Yahya. "Adaptive management of technical condition of power transformers." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 4 (2020): 3862. http://dx.doi.org/10.11591/ijece.v10i4.pp3862-3868.
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Ensuring reliable operation of power transformers as part of electric power facilities is assigned to the maintenance and repair system, whose important components are diagnostics and monitoring of the technical condition. Monitoring allows you to answer the question of whether the transformer abnormalities and how to do they manifest, while diagnostics allow determining the nature, the severity of the problem, determine the cause and possible consequences. The article presents the results of the authors ' research on creating an algorithm for adaptive control of the technical condition of power transformers using diagnostic and monitoring data. The developed algorithm implements the decision-making procedure for ensuring the reliable operation of oil-filled transformer equipment as part of the substations of electric power facilities. The decision-making procedure is based on the method of statistical Bayesian identification the states of a transformer based on the results of dissolved gas analysis (DGA) in oil. The method is characterized by high reliability of recognizing defects in the transformer and the ability to adapt the probabilities of the obtained solutions to the newly received diagnostic information. These results illustrate the effectiveness of the developed approach and the possibility of its application in the operation of oil-filled transformer equipment.
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V., M. Levin, and A. Yahya A. "Adaptive management of technical condition of power transformers." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 4 (2020): 3862–68. https://doi.org/10.11591/ijece.v10i4.pp3862-3868.
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Ensuring reliable operation of power transformers as part of electric power facilities is assigned to the maintenance and repair system, whose important components are diagnostics and monitoring of the technical condition. Monitoring allows you to answer the question of whether the transformer abnormalities and how to do they manifest, while diagnostics allow determining the nature, the severity of the problem, determine the cause and possible consequences. The article presents the results of the author’s research on creating an algorithm for adaptive control of the technical condition of power transformers using diagnostic and monitoring data. The developed algorithm implements the decision-making procedure for ensuring the reliable operation of oil-filled transformer equipment as part of the substations of electric power facilities. The decision-making procedure is based on the method of statistical Bayesian identification the states of a transformer based on the results of dissolved gas analysis (DGA) in oil. The method is characterized by high reliability of recognizing defects in the transformer and the ability to adapt the probabilities of the obtained solutions to the newly received diagnostic information. These results illustrate the effectiveness of the developed approach and the possibility of its application in the operation of oil-filled transformer equipment.
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Aulin, Viktor, Ivan Rogovskii, Oleh Lyashuk, et al. "Comprehensive assessment of technical condition of vehicles during operation based on Harrington’s desirability function." Eastern-European Journal of Enterprise Technologies 1, no. 3 (127) (2024): 37–46. http://dx.doi.org/10.15587/1729-4061.2024.298567.
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The object of research is the process of changing the technical condition of vehicles during their operation. The study solved the problem of comprehensive evaluation of change in the technical condition based on Harrington’s desirability function. The essence of the results is as follows. A scale of desirability was built and a set of criteria for assessing the technical condition of vehicles was clarified. A general desirability index is proposed as a convolution of partial Harrington desirability functions. When solving the investigated problem, the characteristics and properties of the partial and generalized Harrington’s desirability function and their graphical representation were taken into account. Using an example of the technical condition of the chassis and braking system of vehicles, a set of controlled parameters was formed. Based on the values of the controlled parameters, the regression equation of the partial Harrington desirability functions was obtained. The value of the weighting coefficients of each of the criteria was determined and the generalized desirability function was calculated. As a result of the study, it was established that if the generalized criterion of desirability is D<0.37, then individual nodes, systems, and units of the vehicle are in a pre-accident condition, if 0.37£D£0.63 – in a satisfactory condition, and if D>0.63 – in a good condition and cannot be the cause of a traffic accident. An applied aspect of the results is the implementation of the technique of comprehensive assessment of the technical condition of the vehicle. This causes an increase in the productivity of the expert (specialist), will shorten the period of the auto technical examination, and improve its quality. The results could be used by insurance companies and investigators, investigators and judges when considering traffic accidents
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Mashoshin, O. F., and I. G. Kharmats. "Application of the method of insignificant divergences to diagnose the technical aircraft gas turbine engine state under the transient-state conditions of its operation." Civil Aviation High Technologies 26, no. 5 (2023): 81–95. http://dx.doi.org/10.26467/2079-0619-2023-26-5-81-95.
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The article deals with issues related to the use of parametric information of the transient-state gas turbine engines (GTE) operation conditions for diagnosing their technical condition during the operation. A review of general approaches to computational algorithms for the recognition and classification of the condition applicable to aircraft GTE has been carried out. The significance of analytical models in modern algorithms for assessing the technical GTE condition is emphasized. The construction of a linearized mathematical model for the transient-state condition of the generalized-scheme aircraft GTE operation has been considered. It represents a system of equations analytically combining the relative parameter divergences measured during the engine operation with the relative divergences of unmeasured thermogasdynamic parameters and geometric gas-air flow duct parameters allowing for the technical condition of gas-air channel elements to be classified. A method for constructing mathematical and diagnostic engine models, using the transient response data, has been formulated. The capability of employing a method of insignificant divergences, used to build linear (linearized) mathematical and diagnostic GTE models for the steady-state conditions of its operation, has been demonstrated as well. It is shown that, despite the structural similarity of linear models of the steady and transient-state processes, diagnostics by means of the stated above processes is based on completely different principles – under the steady-state condition, the classification of a technical condition is determined by the variation in the value of the group of controlled responses, and under the transient-state condition, this operation is based on correlating the change in the transient-state behavior. To ensure the versatility of employing proposed methods regarding various GTE designs installed on modern civil aircraft, a generalized-design aircraft GTE model – a three-shaft bypass turbojet engine with mixing flows in a common jet nozzle, has been considered.
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Dunaev, A. V., and M. N. Kostomakhin. "Planning engine repairs based on qualitative signs of technical condition." Sel'skohozjajstvennaja tehnika: obsluzhivanie i remont (Agricultural Machinery: Service and Repair), no. 4 (April 30, 2024): 41–47. http://dx.doi.org/10.33920/sel-10-2404-02.
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Due to the significant weakening of the technical operation service of MTP (aging equipment, loss of qualified personnel), the rise in prices of spare parts and fuel and materials, the increase in work on servicing equipment and monitoring its condition by organoleptic methods by the machine owners themselves is becoming increasingly important. Here, centuries of practice have accumulated rich experience. Therefore, novice diagnosticians used all available devices, while experienced ones made do with the minimum. The article describes their experience in identifying diesel malfunctions and preventing their intensive wear and failure.
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Kostomakhin, M. N. "Evaluation of Agricultural Machinery Operation Modes." Agricultural Machinery and Technologies 14, no. 4 (2020): 78–83. http://dx.doi.org/10.22314/2073-7599-2020-14-4-78-83.
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The author presented material on the evaluation of agricultural machines operating modes and operating conditions using the technical condition monitoring system developed by scientists of the Federal Scientifi c Agroengineering Center VIM. He showed an example of proximity sensors use on the Kioti CK22 tractor to assess the emergency mode of operation, which could subsequently lead to premature failure. The author considered the possibilities of the most rational application of the remote monitoring algorithm to diagnostics – to identify the causes of malfunctions.(Research purpose) To improve the existing and develop new technologies for remote evaluation of the machines current technical condition throughout the entire operation.(Materials and methods) It was confi rmed that the remote monitoring system algorithm developed by the VIM scientists made it possible to provide automated control of the units and machine assemblies technical condition parameters. The system was operated on the basis of documenting the facts of the machine's operation in emergency or pre-emergency modes. The parameters control within the acceptable limits was provided.(Results and discussion) After analyzing the failure reasons, the author established the initial nomenclature of the studied processes. An algorithm for remote parameters monitoring was developed, which made it possible to assess the machine operating modes. He tested the algorithm functionality using the example of installing proximity sensors and an on-board computer on a Kioti CK22 tractor.(Conclusions) Using the installed on-board system and 8 sensors,information was obtained that made it possible to assess the current technical condition of the Kioti CK22 tractor based on the dynamics of 8 monitored parameters characterizing a gradual change in the functionality of the machine/system and aff ecting technical and environmental safety
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Smolkin, Kirill Anatolyevich, Pavel Petrovich Gamayunov, and Sergey Alexandrovich Alekseev. "CHANGING THE TECHNICAL CONDITION OF PASSENGER CAR ENGINES UNDER OPERATING CONDITIONS." SCIENTIFIC LIFE 19, no. 3 (2024): 434–42. http://dx.doi.org/10.35679/1991-9476-2024-19-3-434-442.
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This study presents the results of collecting and analyzing statistics on the wear of pistons of budget-class passenger car engines during active operation. The devices and methods of collecting experimental data on the wear of the cylinder-piston group of engines are described. The main ones were: measuring piston wear in four projections with a micrometer MK-100 GOST 6507-90 with a measurement error of ± 0.005 mm and measuring the compression properties of engines with a compressor, the latter showed low accuracy of displaying the technical condition according to the results of the study. The purpose of the study was to verify the effectiveness of common methods of diagnosing internal combustion engines, as well as to identify the dependence of wear on the frequency of oil change, the design features of the engine lubrication system (the presence of oil nozzles cooling pistons). As a result of the study, the inefficiency of the diagnostic method by measuring compression with various devices was revealed, since when the cylinder-piston group wears out with simultaneous wear of the rubber seals of the valves, the oil acts as an additional seal in the engine cylinder and "masks" the actual compression index of the internal combustion engine. In addition, the results of the study confirmed the effectiveness of the presence in the design of the lubrication system of piston cooling oil injectors designed to supply oil when a certain pressure in the lubrication system is reached to a more loaded cylinder wall and piston bottom – based on the revealed fact, it becomes possible to make recommendations on the refinement of the engine design during major repairs at automobile enterprises, service stations by introducing oil injectors into the engine block, which will lead to an increase in the life of the cylinder-piston group and longer trouble-free operation of the engines.
Dissertations / Theses on the topic "Operation based on technical condition"
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Eastwood, Paul Graham. "Diesel engine condition monitoring : laser-based diagnostic techniques." Thesis, University of Southampton, 1989. https://eprints.soton.ac.uk/52246/.
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Nazari, Masoud Honarvar. "Making the Most out of Distributed Generation without Endangering Normal Operation: A Model-Based Technical-Policy Approach." Research Showcase @ CMU, 2012. http://repository.cmu.edu/dissertations/141.
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In this dissertation we introduce a model-based approach for efficiently locating and operating distributed generation (DG) without endangering stable system operation. The proposed approach supports quantifiable policy making based on technical design. The model used is structural and it comprises local models of DGs and loads interconnected via distribution grid system. While similar model structure can be used to represent meshed transmission grids, identifying model properties unique to distribution systems sets the basis for interpreting power delivery losses as the key measure of the overall system efficiency. It furthermore sets the basis for designing decentralized control specifications necessary to ensure system-wide stability. Once the underpinnings of the technical design are understood, the findings are used to propose a model-based quantifiable policy design to support process of integrating and operating DGs in distribution systems.
We first investigate efficient integration of distributed generation on the distribution side of electric energy systems. We introduce a notion of efficiency in distribution systems which is uniquely determined by the fact that DG units are clean and inexpensive; because of this DGs are always scheduled and there is no need for economic dispatch. This points to the fact that the main measure of efficiency is loss minimization. This notion helps us in streamlining specific methods for optimizing losses both in planning and operation. At the planning stage the best location is found, and in operation optimal voltage dispatch is done to reduce losses. We show that a 10% penetration of DG units can reduce up to 50% of distribution losses, if DG units are strategically located and optimally operated in distribution systems.
One possible problem with optimal placement of DG units may be an overly high sensitivity of their response to even small perturbations from normal conditions. Therefore, a very efficient distribution system with optimally-placed DG units may not be robust in operations. In order to assess robustness of distribution energy systems with respect to small disturbances, we model distribution systems as dynamical systems. We show that because of the strongly coupled voltage/real-power interdependencies in power flows of distribution systems, it is no longer possible to use a decoupled real-power dynamic model which neglects the effects of voltage dynamics. This conclusion is a direct consequence of a non-negligible resistance-reactance ratio in distribution systems which differentiate them from the typical transmission systems. Therefore, only coupled models should be used for stability analysis and for control tuning of DGs in distribution systems.
Using such a dynamic model we show that distribution systems with high penetration of DG units can exhibit frequency- and/or voltage-instabilities when power plants have conventionally tuned control. Such instabilities are particularly pronounced when the DG units are electrically close. Gerschgorin circle theorem and participation factor-based methods are used to identify the main cause of instabilities as being the interactions of the local DG dynamics through the distribution power grid. Since the proposed dynamical model structure allows us to represent any type of DG plant and its local control, stability analysis can be performed for a general type of a DG using these methods to determine bounds on interactions between each specific DG and the rest of the system so that no interactions occur.
These bounds are dependent on the machine type and parameters, the local control and the grid parameters. Some DGs may not have sufficient control as measured in terms of these bounds, and, these are the ones which require enhanced control to ensure system-level stability without unstable interactions, as discussed next.
The severity of dynamical problems in specific distribution systems with DGs depends on the technology and control of DGs and on the electrical distances between the DGs. Typical DGs are either synchronous machines or induction machines whose inertia may be much smaller than the inertia of large generators. Their local control may range from no control, through well-understood governor-excitation control of synchronous machines, through power electronically controlled inverters of synchronous and/or induction machine type DGs (power system stabilizers (PSS) and/or doubly fed induction machines (DFIG)).
In this dissertation we have studied stability problems in systems with DGs being small and/or medium size synchronous machines controlled by governor-excitation systems and/or by pitch control combined with PSS control. We assess possible instabilities in such systems when controllers are tuned on a stand-alone machine connected to the impedance representing the rest of the system (today's practice). We show that a more systematic fully decentralized, and, therefore, simple, control design proposed, in this dissertation, could stabilize synchronous machine-type DGs, such as diesel and hydro plants, without inverter control. Moreover, synchronous machine-type wind power plants can be stabilized in a decentralized way by combining advanced pitch control and/or PSS control.
Based on the above technical findings we propose a policy-making process for giving guidelines: (1) to best locate candidate DG units; (2) to dispatch set points on the voltage controllers of DGs in coordination with dispatching set points of other voltage-controllable equipment for ensuring minimal losses in operations; and, (3) to enhance the existing control of the DGs and/or deploy new enhanced decentralized control. Because the solutions are system-dependent, simple one-size-fits-all policies are no longer viable; instead, policy decisions must be supported by software for placing the DGs and for designing their voltage dispatch and control. This approach leads to systematic institutional agreements and policies needed to support large penetration of DG units while ensuring both efficiency and robustness of distribution energy systems.
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Nazari, Masoud Honarvar. "Making the most out of distributed generation without endangering normal operation: A model-based technical-policy approach." Doctoral thesis, Research Showcase @ CMU, 2012. https://repositorio-aberto.up.pt/handle/10216/75829.
Full textAbstract:
In this dissertation we introduce a model-based approach for efficiently locating and operating distributed generation (DG) without endangering stable system operation. The proposed approach supports quantifiable policy making based on technical design. The model used is structural and it comprises local models of DGs and loads interconnected via distribution grid system. While similar model structure can be used to represent meshed transmission grids, identifying model properties unique to distribution systems sets the basis for interpreting power delivery losses as the key measure of the overall system efficiency. It furthermore sets the basis for designing decentralized control specifications necessary to ensure system-wide stability. Once the underpinnings of the technical design are understood, the findings are used to propose a model-based quantifiable policy design to support process of integrating and operating DGs in distribution systems.
We first investigate efficient integration of distributed generation on the distribution side of electric energy systems. We introduce a notion of efficiency in distribution systems which is uniquely determined by the fact that DG units are clean and inexpensive; because of this DGs are always scheduled and there is no need for economic dispatch. This points to the fact that the main measure of efficiency is loss minimization. This notion helps us in streamlining specific methods for optimizing losses both in planning and operation. At the planning stage the best location is found, and in operation optimal voltage dispatch is done to reduce losses. We show that a 10% penetration of DG units can reduce up to 50% of distribution losses, if DG units are strategically located and optimally operated in distribution systems.
One possible problem with optimal placement of DG units may be an overly high sensitivity of their response to even small perturbations from normal conditions. Therefore, a very efficient distribution system with optimally-placed DG units may not be robust in operations. In order to assess robustness of distribution energy systems with respect to small disturbances, we model distribution systems as dynamical systems. We show that because of the strongly coupled voltage/real-power interdependencies in power flows of distribution systems, it is no longer possible to use a decoupled real-power dynamic model which neglects the effects of voltage dynamics. This conclusion is a direct consequence of a non-negligible resistance-reactance ratio in distribution systems which differentiate them from the typical transmission systems. Therefore, only coupled models should be used for stability analysis and for control tuning of DGs in distribution systems.
Using such a dynamic model we show that distribution systems with high penetration of DG units can exhibit frequency- and/or voltage-instabilities when power plants have conventionally tuned control. Such instabilities are particularly pronounced when the DG units are electrically close. Gerschgorin circle theorem and participation factor-based methods are used to identify the main cause of instabilities as being the interactions of the local DG dynamics through the distribution power grid. Since the proposed dynamical model structure allows us to represent any type of DG plant and its local control, stability analysis can be performed for a general type of a DG using these methods to determine bounds on interactions between each specific DG and the rest of the system so that no interactions occur.
These bounds are dependent on the machine type and parameters, the local control and the grid parameters. Some DGs may not have sufficient control as measured in terms of these bounds, and, these are the ones which require enhanced control to ensure system-level stability without unstable interactions, as discussed next.
The severity of dynamical problems in specific distribution systems with DGs depends on the technology and control of DGs and on the electrical distances between the DGs. Typical DGs are either synchronous machines or induction machines whose inertia may be much smaller than the inertia of large generators. Their local control may range from no control, through well-understood governor-excitation control of synchronous machines, through power electronically controlled inverters of synchronous and/or induction machine type DGs (power system stabilizers (PSS) and/or doubly fed induction machines (DFIG)).
In this dissertation we have studied stability problems in systems with DGs being small and/or medium size synchronous machines controlled by governor-excitation systems and/or by pitch control combined with PSS control. We assess possible instabilities in such systems when controllers are tuned on a stand-alone machine connected to the impedance representing the rest of the system (today's practice). We show that a more systematic fully decentralized, and, therefore, simple, control design proposed, in this dissertation, could stabilize synchronous machine-type DGs, such as diesel and hydro plants, without inverter control. Moreover, synchronous machine-type wind power plants can be stabilized in a decentralized way by combining advanced pitch control and/or PSS control.
Based on the above technical findings we propose a policy-making process for giving guidelines: (1) to best locate candidate DG units; (2) to dispatch set points on the voltage controllers of DGs in coordination with dispatching set points of other voltage-controllable equipment for ensuring minimal losses in operations; and, (3) to enhance the existing control of the DGs and/or deploy new enhanced decentralized control. Because the solutions are system-dependent, simple one-size-fits-all policies are no longer viable; instead, policy decisions must be supported by software for placing the DGs and for designing their voltage dispatch and control. This approach leads to systematic institutional agreements and policies needed to support large penetration of DG units while ensuring both efficiency and robustness of distribution energy systems.
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Ebrahimi, Ali. "Effect analysis of Reliability, Availability, Maintainability and Safety (RAMS ) Parameters in design and operation of Dynamic Positioning (DP) systems in floating offshore structures." Thesis, KTH, Industriell produktion, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102787.
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The objective of this thesis is to identify, which hazards and failures in operation process will affect Reliability, Availability, Maintainability and Safety of floating offshore structures. The focus is on Dynamic Positioning (DP) system that has the responsibility of keeping the offshore structure in the upright position operation. DP system is one of the most critical subsystems on these types of structures in terms of safety of operation and failure risk costs. Reliability of the system in this thesis has been analyzed in qualitative and quantitativeb methods. In qualitative method to find the effective parameters on the reliability of the DPb system, Reliability Centered Maintenance (RCM ) and its application as a main tool have been used. To achieve the aim it has been tried to define the events and accidents which could be generated by the identified hazards then tried to determine the consequences of the realized accidents. In this step three categories are taken in to account including, safety, operation, and equipment. Next phase should be concentrated on considering and analyzing the relevant processes and the root causes which result in the identified hazard. After clarifying all probable root causes it has been tried to prioritize the root causes and specifying the necessary preventive actions. The aim of this step is either decreasing the occurrence of root causes or increasing the detectability of hazards. In the last part quantitative method has been used to measure the amounts of Reliability, Availability and Maintainability of the system, based on MTBF and MTTR of different components of the system and it has been tried to present the solutions to improve system reliability based on components RCM tables. Further, assuming DP system as human- machine system safety assessment has been included to indicate human factors in the reliability of the system beside probable failure of the components of the system.
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LIU, Yongqian. "Contributions to the Methodologies and Technologies for the Intelligent Control-Maintenance-technical Management Systems (ICMMS) in Hydropower Plants." Phd thesis, Université Henri Poincaré - Nancy I, 2002. http://tel.archives-ouvertes.fr/tel-00003396.
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Les travaux présentés contribuent à un des enjeux majeurs de l'Entreprise Etendue liée au domaine de la production d'énergie électrique. L'objectif est de maintenir en dynamique la qualité des services rendus par les processus de production. Ces travaux ont ainsi pour objet, en se référant au cadre de modélisation d'Entreprise GERAM, de proposer une méthodologie réutilisable pour l'automatisation intégrée des centrales hydroélectriques. Ces dernières étant structurellement des systèmes stables, cette méthodologie est basée sur une approche orientée processus et aboutit au développement de modèles pérennes et réutilisables. Le point central de cette méthodologie consiste en la définition d'un modèle de référence ICMMS (Intelligent Control-Maintenance-technical Management Systems) formalisant la connaissance générique, de niveau terrain, applicable à l'automatisation de toute centrale hydroélectrique. La mise en œuvre de ce modèle de référence conduit à la proposition d'une architecture HSAS (Hybrid Smart Automation System) qui intègre en un tout cohérent sur les points de vue Contrôle, Maintenance et Gestion Technique, les différents composants d'automatisation distribués, supportés par des actionneurs, capteurs, ou contrôleurs conventionnels de niveau terrain. Par rapport à cette architecture, les concepts innovants de "Surveillance Conditionnelle" pour l'îlot Maintenance et d' "Atténuation de Perturbations" pour l'îlot Contrôle sont définis et étudiés afin d'être intégrés au système ICMMS. De plus, nous proposons, pour la Gestion Technique, des concepts, critères et outils pour l'évaluation de performances des HGUs (Hydroelectric Generating Units). Cette contribution est basée sur la définition d'un système d'évaluation des performances économiques utilisant des descripteurs quantitatifs mesurant l'état d'efficacité, le niveau de gestion de l'exploitation et l'état de maintenance de ces unités. Une nouvelle stratégie en lien avec la maintenance, intitulée EBM (Economic performance Based Maintenance), est ainsi formalisée. L'ensemble de nos propositions est validée sur une étude de cas.
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Gjordeni, Kejsi, and Ayca Kaya. "Digitizing the Maintenance Management Operation : Exploring the Opportunities of an Information System in a Railway Maintenance Organization." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264090.
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The phenomenon of digitization is transforming industries worldwide by introducing new valueproducing opportunities. In the railway industry, market liberalization has resulted in increased competition. To remain profitable in this new market environment, rail operators need to transform and acquire new digital capabilities and tools. By digitizing information-intensive processes with an information system, railway companies can reduce loss of operation time and reduce total maintenance costs. At the same time, the limited research exploring information systems in maintenance management has made it challenging for companies wanting to digitize. Significant attention has been devoted to the separate topics, however research overlapping the two areas of study has been inadequate. The thesis aims to contribute with knowledge to bridge this gap in literature by investigating the opportunities a maintenance organization potentially can capture with an information system and the success factors needed to succeed. By conducting the thesis in collaboration with the Swedish railway maintenance company MTR Tech AB the potential uses of an information system have been identified and assessed. Findings indicate that there are three main business opportunities to obtain from an information system: support of the troubleshooting process, better planning of reactive maintenance and enabling the performance of condition-based maintenance. At the same time, the profitability of an information system was found to be directly linked to its degree of utilization. Our findings have therefore allowed us to conclude that the business opportunity to pursue is the one that is most likely to be carried out fully and successfully in the prevailing circumstances. Lastly, the findings conclude that the success factors needed to capture the desired business opportunities are a dedicated project group, clear communication and information sharing, as well as adequate personnel.<br>Digitalisering har påverkat och transformerat företag över hela världen genom att erbjuda nya värdeproducerande möjligheter. För att bibehålla konkurrenskraft i en föränderlig omvärld måste järnvägsoperatörer transformera sina företag och förvärva nya digitala lösningar och verktyg kopplade till järnvägsteknologier. Genom att digitalisera informationsintensiva processer med hjälp av informationssystem, blir det möjligt för järnvägsföretag att minska förlust av drifttid samt minska den totala underhållskostnaden. Samtidigt har den begränsade forskningen gällande användning av informationssystem i underhållsorganisationer försvårat digitaliseringsförsöken. Litteratur och tidigare studier har behandlat de två ämnena separat, dock har överlappande forskning varit otillräcklig. Denna studie syftar till att bidra med kunskap för att överbrygga gapet i litteraturen genom att undersöka de vinningar en underhållsorganisation kan erhålla med hjälp av ett informationssystem och de framgångsfaktorer som krävs för att uppnå dem. Genom att utföra denna studie i samarbete med det svenska underhållsbolaget MTR Tech AB har de potentiella användningsområdena av ett informationssystem identifierats. De tre huvudsakliga affärsmöjligheterna som kan erhållas från ett informationssystem är: stödjande av felsökningsprocessen, bättre planering av avhjälpande underhåll, samt möjliggörandet av tillståndsbaserat underhåll. Samtidigt har det visat sig att lönsamheten av ett informationssystem är direkt kopplat till dess utnyttjandegrad. Vi har således dragit slutsatsen att den affärsmöjlighet som bör eftersträvas är den som med största sannolikhet kommer att genomföras framgångsrikt under rådande omständigheter. Slutligen visar våra resultat att de framgångsfaktorer som krävs för att uppnå affärsmöjligheterna är en dedikerad projektgrupp, tydlig kommunikation och informationsdelning, samt lämplig personal.
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Krupa, Miroslav. "Metody technické prognostiky aplikovatelné v embedded systémech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233568.
Full textAbstract:
Hlavní cílem dizertace je poskytnutí uceleného pohledu na problematiku technické prognostiky, která nachází uplatnění v tzv. prediktivní údržbě založené na trvalém monitorování zařízení a odhadu úrovně degradace systému či jeho zbývající životnosti a to zejména v oblasti komplexních zařízení a strojů. V současnosti je technická diagnostika poměrně dobře zmapovaná a reálně nasazená na rozdíl od technické prognostiky, která je stále rozvíjejícím se oborem, který ovšem postrádá větší množství reálných aplikaci a navíc ne všechny metody jsou dostatečně přesné a aplikovatelné pro embedded systémy. Dizertační práce přináší přehled základních metod použitelných pro účely predikce zbývající užitné životnosti, jsou zde popsány metriky pomocí, kterých je možné jednotlivé přístupy porovnávat ať už z pohledu přesnosti, ale také i z pohledu výpočetní náročnosti. Jedno z dizertačních jader tvoří doporučení a postup pro výběr vhodné prognostické metody s ohledem na prognostická kritéria. Dalším dizertačním jádrem je představení tzv. částicového filtrovaní (particle filtering) vhodné pro model-based prognostiku s ověřením jejich implementace a porovnáním. Hlavní dizertační jádro reprezentuje případovou studii pro velmi aktuální téma prognostiky Li-Ion baterii s ohledem na trvalé monitorování. Případová studie demonstruje proces prognostiky založené na modelu a srovnává možné přístupy jednak pro odhad doby před vybitím baterie, ale také sleduje možné vlivy na degradaci baterie. Součástí práce je základní ověření modelu Li-Ion baterie a návrh prognostického procesu.
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Нагорний, Володимир В`ячеславович, Владимир Вячеславович Нагорный та Volodymyr Viacheslavovych Nahornyi. "Контроль динамического поведения металлообрабатывающих технологических систем и метод определения их ресурса". Thesis, Изд-во СумГУ, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42598.
Full textAbstract:
Робота присвячена актуальній проблемі розвитку методів контролю
динамічної поведінки металообробних технологічних систем та розробки методу
визначення їх ресурсу. У роботі вперше поставлене і вирішене науково-технічне
завдання визначення ресурсу обробної системи безпосередньо в процесі її роботи в умовах, коли «Норми…» , яки регламентують ступінь критичності динамічної поведінки для даних систем, відсутні. Це завдання вирішене за рахунок того, що розроблена у роботі прогнозна модель вигідно відрізняється від прийнятих тим, що ресурс, який шукається, включено до її математичної структури і визначається в процесі ідентифікації моделі за результатами моніторингу тренда звуку, супроводжуючого роботу обробних систем. Це дозволило визначати індивідуальний ресурс обробної системи, який відповідає даним технологічним умовам її експлуатації. Для здійснення оперативного контролю динамічної поведінки обробної системи був розроблений алгоритм контролю та його програмна реалізація, яка за допомогою мікропроцесорного пристрою дозволила автоматизувати процес контролю динамічної поведінки обробної системи та визначення її ресурсу. Методи досліджень: теорії коливань, ідентифікації та математичної статистики. Розроблення алгоритму контролю здійснювалося на основі методів інформаційних технологій. Аналіз експериментальних даних проводився на основі теорії цифрової обробки сигналів, для вирішення завдань визначення ресурсу використані методи випадкового пошуку.<br>Работа посвящена актуальной проблеме контроля в режиме реального
времени динамического поведения обрабатывающих систем и развитию методов определения их ресурса. В работе впервые поставлена и решена научно-техническая задача расчётно-экспериментального исследования динамического поведения обрабатывающих систем в зависимости от изменения технического состояния их элементов(станка, режущего инструмента и детали). Это позволило получить новое решение научно-технической задачи контроля динамического поведения обрабатывающих систем и определения их ресурса в условиях, когда «Нормы…», регламентирующие степень критичности их динамического поведения отсутствуют. В качестве информационного сигнала, косвенно характеризующего качество функционирования обрабатывающих систем, выбран звук, сопровождающий процесс их работы. Как показали исследования, тренд звукового сигнала подобен кривой износа режущего инструмента, а его временная реализация и частотный спект, совпадают с профилем шероховатости и ее частотным спектром, что позволяет звуку наиболее полно отражать динамическое поведение обрабатывающих систем.
Разработана прогнозная модель, особенность которой заключается в том,
что искомый ресурс обрабатывающей системы включен в ее математическую
структуру и определяется при идентификации модели по результатам
мониторинга тренда звука, сопровождающего процесс работы обрабатывающей
системы. Получены расчетные зависимости для показателей состояния,
позволяющих в понятиях теории нечетких множеств отнести с точки зрения
динамики разнообразные технологические условия работы обрабатывающих
систем к ряду стандартних, что послужило основой для разработки алгоритма
контроля динамического состояния обрабатывающей системы. Процесс контроля был автоматизирован за счет использования микропроцессорного устройства, содержащего программный модуль, формализующий указанный алгоритм контроля. Автоматизация процесса контроля позволила реализовать в практике реального производства результаты диссертационной работы, что обеспечило в режиме реального времени контроль качества обработки детали и технического состояния режущего инструмента и станочного оборудования.
Методы исследований: методы теории колебаний, идентификации и
математической статистики. Разработка алгоритма контроля динамического
поведения обрабатывающих систем и определения на этой основе их ресурса
осуществлялось на основе методов информационных технологий. Анализ
экспериментальных данных проводился на основе теории цифровой обработки
сигналов. Для решения задач определения ресурса использованы методы
случайного поиска.<br>The work is devoted to the actual problem of control dynamic behavior of metalprocessing systems and method of determining their life. For the first time solved the scientific and technical problem of forecasting resource of the metal-processing systems in the course of their work turning without the use of statistical data on the working time of the metal-processing systems to replace it. This problem is solved with the help of a predictive model, in the mathematical structure, which enabled the desired metalprocessing systems life. A resource is defined in the identification process model, based on the results of monitoring the trend of information parameter, accompanying the working process. In order to implement operational control of the mashinig developed forecasting system was automated with the help of specially developed for this purpose microprocessor-based controlo - prognostic system, that allows simultaneous with forecasting control the quality of machining and diagnosis the technical state of the tool and machine.
Methods: cutting theory, oscillation theory, identification and mathematical
statistics. System design, was based on the methods of information technology.
Experimental data, were analyzed, based on the theory of digital signal processing. To
solve the problems prediction used methods of random search.
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Horák, Vít. "Analýza vlivu polohy a technického stavu na obvyklou cenu vybraných rodinných domů ve Valašském Meziříčí a okolí." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-232913.
Full textAbstract:
This diploma thesis is describing extent of impact of location on real estate placed in town Valašské Meziříčí and comparing it with other real estates located near town Valašské Meziříčí. This diploma thesis is also solving question if is area of town Valašské Meziříčí so much significant that can balance better technical conditions or other positive technical distinctions of compared real estates. For solving this question will be evaluated five real estates. For the evaluations will be used these ways of evaluation: evaluation based on costs, comparing of real estates based on valid price regulation and direct comparing.
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Kluzová, Ivana. "Návrh soustavy CZT a tepelných zdrojů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378717.
Full textBooks on the topic "Operation based on technical condition"
1
Cevelev, Aleksandr. Strategic development of railway transport logistics. INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1194747.
Full textAbstract:
The monograph is devoted to the methodology of material and technical support of railway transport. According to the types of activities, the nature of the material and technical resources used, technologies, means and management systems, Russian railways belong to the category of high-tech industries that must have high quality and technical level, reliability and technological efficiency in operation. For this reason, the logistics system itself, both in structure and in the algorithm of the functions performed as a whole, needs a serious improvement in the quality of its work. The economic situation in Russia requires a revision of the principles and mechanisms of management based on the corporate model of supply chain management, focused on logistics knowledge. In the difficult economic conditions of the current decade, it is necessary to improve the quality of the supply organization of enterprises and structural divisions of railway transport, directly related to the implementation of the process approach, the advantage of which is a more detailed regulation of management actions and their mutual coordination. In order to increase the efficiency of its activities and develop the management system, Russian Railways is developing a lean production system aimed at further expanding the implementation of the principles of customer orientation, ideology and corporate culture.
 At the present time, the solution of many issues is impossible without a cybernetic approach to the formulation of problems of material and technical support and logistics analysis of information technologies, to the implementation of the developed algorithms and models of development strategies and concepts for improving the business processes of the production system. The management strategy, or the general plan for the implementation of activities for the management of material resources, is based on a fundamental assessment of the alignment and correlation of forces and factors operating in the economic and political field, taking into account the impact on the specific form of the management strategy.
 The materials will be useful to the heads and specialists of the directorates of the MTO, CDZs and can be used in the scientific research of bachelors, masters and postgraduates interested in the economics of railway transport and supply logistics.
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Bukov, Valentin, Andrey Ageev, Aleksandr Evgenov, and Vladimir Shurman. Redundancy management of technical systems. A supervisory way to manage configurations. INFRA-M Academic Publishing LLC., 2023. http://dx.doi.org/10.12737/1959232.
Full textAbstract:
The monograph is devoted to the issue of redundancy management of technical systems in the interests of giving them the properties of survivability, fault tolerance, fault safety, adaptation to changing operating conditions and rational use of available resources. Attention is focused on the supervisory approach to the redundancy management of technical systems based on specially introduced software and logic structures — configuration supervisors. Ideas and solutions on the information structure and control algorithms for reconfiguring avionics complexes with redundancy of heterogeneous non-universal components are systematically presented.
 Designed for students and postgraduates of technical universities, as well as researchers and designers specializing in the development, research and testing of reconfigurable technical systems.
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Ivanov, Anatoliy. Flexible modular assembly lines on a single structural basis. INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1196558.
Full textAbstract:
The textbook discusses topical issues of automating the assembly of an extensive range of machine and instrument-making products based on highly efficient robotic reconfigurable systems of a new generation built on a single structural basis. The possibility of fast organization of automated assembly of new types of products, which is provided by the presence of a flexible basic set as part of the complex (line), is shown. A complete set of original technical means for basic and service operations of assembly and control of products is described. Analytical conditions of automatic assembly are given, and recommendations on optimization of design solutions and modeling of projected assembly systems are given.
 It is intended for students studying under the bachelor's degree programs, certified specialists and masters, teachers of technical universities, as well as designers, technologists and scientists dealing with the problem of complex assembly automation.
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Leonovich, Sergey, and Vitaliy Gurinovich. Organizational and technological solutions for reconstruction and modernization of industrial housing construction enterprises. INFRA-M Academic Publishing LLC., 2025. https://doi.org/10.12737/2180374.
Full textAbstract:
The monograph presents organizational and technological solutions for the technical re-equipment of industrial housing construction enterprises, taking into account the totality of operating production conditions, the methodology for assigning reserves of production capacities for the production of a wide range of products and changing demand for products, and production optimization solutions. The organizational and technological solutions for the development of the production base of industrial housing construction based on flexible production technology are considered in detail. For the first time, methods have been developed to improve the technological level of industrial housing construction enterprises without stopping the main production. The dependence of the production capacity of enterprises on the parameters of the product range has been established. The recommendations of assigning reserves to the production capacity of enterprises in the context of the production of a wide range of products and changes in demand for products are substantiated. The optimization of production was carried out by ensuring the rhythm of production based on the criteria of complexity of products in the nomenclature of the production program of enterprises. It will be useful for specialists to make design, organizational and managerial decisions for the production of basic types of flat precast concrete products at industrial housing construction enterprises.
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Ishkov, Aleksandr, Mihail Vikulov, and Yuriy Bochkarev. Operation of mining and transport vehicles in the quarries of the North. INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1077325.
Full textAbstract:
The textbook discusses the features of the operation of mining and transport machines in open-pit mining in a cold climate zone, highlights previously unexplored problems of operation of this type of equipment, and describes methods for determining the operational reliability of equipment.
 The proposed methods of operation are based on the analysis of a significant amount of statistical material on failures of equipment operating at large mining enterprises of the Republic of Sakha (Yakutia). The influence of low temperatures on the reliability indicators and technical and economic results of the operation of mining and transport machines was determined quantitatively and qualitatively.
 Meets the requirements of the federal state educational standards of higher education of the latest generation.
 It is intended for students of higher educational institutions studying in the specialty 21.05.04 "Mining", it can also be useful for graduate students, researchers and practitioners specializing in the technical operation of mining and transport machines.
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Zhukov, Aleksey, Ekaterina Bobrova, Igor' Bessonov, and Elizaveta Mednikova. Energy efficiency of building systems. INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1856852.
Full textAbstract:
The monograph summarizes and systematizes the results of experimental and theoretical studies of thermal insulation systems of building structures, technological facilities, transport facilities, and cold preservation.
 The criterion for the effectiveness of system insulation solutions is energy efficiency as a criterion for a comprehensive assessment, including both taking into account the direct reduction of energy costs during the operation of insulation shells, and the costs of installation, maintenance of structures in working condition, evaluation of the operational resistance of materials and durability of system solutions as a whole.
 Modern types of thermal insulation materials based on gas-filled plastics, foamed glass, foamed rubber and products based on mineral fibers are considered: stone wool, glass wool and glass fiber, basalt fiber.
 It is intended for researchers, specialists in the field of materials science, technologists — developers of new types of thermal insulation materials and constructors, designing products from them, as well as for teachers and university students. It can be useful for a wide range of people interested in construction and energy saving problems.
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Gavrilov, Leonid. Pulse circuits and devices. INFRA-M Academic Publishing LLC., 2025. https://doi.org/10.12737/2125014.
Full textAbstract:
The textbook discusses unit and pulse functions in relation to the analysis of processes in electrical circuits and generalized functions used in the approximation of multiphase pulse functions. The paper describes the operator and spectral methods used in the analysis of pulse circuits, as well as electronic devices whose operation is based on the use of pulse functions. Meets the requirements of the latest generation of federal state educational standards for higher education. It will be useful for students of technical universities studying such disciplines as the theoretical foundations of electrical engineering, pulse circuits, converter technology, and power electronics.
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Bashkatov, Aleksandr. Simulation of accidents on route transport. INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1860140.
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The monograph is devoted to the study of accidents in the operation of fixed-route vehicles and the development of organizational measures that increase the safety of its functioning within the city. Based on the collected and systematized statistical data, an integrated approach to solving transport security problems has been applied. Within the framework of the study, mathematical models and methods for assessing factors affecting the accident rate of route vehicles are proposed, a statistical assessment of their significance is carried out and technological techniques for improving safety on highways are proposed.
 It is intended for specialists of management services, dispatchers of transport companies, and may also be of interest to engineering, technical and scientific workers involved in the safety and organization of route transport in cities.
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Osincev, Nikita, and Aleksandr Rahmangulov. Sustainable development of logistics chains of cargo flows. INFRA-M Academic Publishing LLC., 2025. https://doi.org/10.12737/2133677.
Full textAbstract:
The monograph presents an approach to solving the problem of formation and management of logistics chains of cargo flows to achieve the goals of sustainable development. The toolkit for managing cargo flow chains is described in detail, based on the use of principles and tools of green logistics and multi-criteria decision-making methods. The monograph material is illustrated with examples of the implementation of the proposed approach. It is intended for managers of transport and logistics companies, engineering and technical staff involved in solving problems in the field of logistics, supply chain management, transport system management, and sustainable development. In addition, it is recommended to students in the following programs: 2.9.1 Transport and transport technology systems of the country, its regions and cities, organization of production in transport, 2.9.8 Intelligent transport systems and 2.9.9 Logistics transport systems; 04/23/2011 "Technology of transport processes (Organization of transportation and management in a single transport system)"; 05/23/04 "Operation of railways"; 03/38/02 "Management (Logistics)" and 03/23/2011 "Technology of transport processes".
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Bogumil, Veniamin, and Sarango Duke. Telematics on urban passenger transport. INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1819882.
Full textAbstract:
The monograph discusses the application of telematics in dispatch control systems in urban passenger transport. The role of telematics as a technological basis in automating the solution of control tasks, accounting and analysis of the volume and quality of transport work in modern dispatch control systems on urban passenger transport is shown. Analytical models have been developed to estimate the capacity of a high-speed bus transportation system on a dedicated line. Mathematical models and algorithms for predicting passenger vehicle interior filling at critical stages of urban passenger transport routes are presented. The issues of application of the concept of the phase space of states introduced by the authors to assess the quality of the passenger transportation process on the route of urban passenger transport are described. The developed classification of service levels and their application in order to inform passengers at stopping points about the degree of filling of the passenger compartment of the arriving vehicle is described. The material is based on the results of theoretical research and practical work on the creation and implementation of automated control systems for urban passenger transport in Russian cities. The material of M.H. Duque Sarango's dissertation submitted for the degree of Candidate of Technical Sciences in the specialty 05.22.10 "Operation of motor transport" was used.
 It will be useful to specialists in the field of telematics on urban passenger transport.
Book chapters on the topic "Operation based on technical condition"
1
Semko, Volodymyr, and Nataliia Mahas. "Assessment of Existing Structures for Elongation of the Buildings Lifecycle Based on Ukrainian Experience and Codes." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57800-7_13.
Full textAbstract:
AbstractOne of the effective ways to increase the efficiency of the circular economy is the reuse of existing structures and parts of buildings or extending the life cycle of existing buildings. Assessing the technical condition of existing systems is the basis for reliable and safe operation, both of structures and buildings as a whole. The paper analyses the history and development of Ukrainian standards (codes). It compares methods for evaluating the technical condition of existing structures presented in Ukrainian standards with those shown in the international standard for assessing existing members. Over the past 30 years, Ukraine has actively developed methods for assessing the technical condition of existing steel, reinforced concrete and composite structures. The basis of the results of the analyzed works is theoretical, experimental, and full-scale studies of existing structures. Much work is devoted to assessing the reliability of existing and damaged building structures. Methods of reliability theory have been applied to evaluate enclosure structures, for which a new term - thermal reliability of enclosure structures - has been introduced. Based on the analysis of codes and research, recommendations have been prepared for implementing sustainable practices into European standards.
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Wang, Chonglin, Sizhen Liang, Jingjie Feng, Ran Li, and Gaolei Zhao. "The Variation of Hydrological Regime According to the Daily Operation of a Complementary Hydro-Photovoltaic Reservoir and Its Impact." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_41.
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AbstractDaily operation of a hydropower station is conducted to meet the energy requirement. The hydraulic parameters of the downstream are significantly affected by the dam operation, which has a negative impact on the aquatic system. When the multi energy complementary method is used, such as hydro-photovoltaic (hydro-PV) combined power generation, the problem will worsen. Hydropower station A (HSA) on River X was selected to investigate the impact of daily operation. HSA is a part of hydro-PV complementary power generation. The spawning and breeding period of typical fish, April to July, was selected as the study period. According to various scheduling, the changes of hydrological regime were analyzed. The results show that the maximum flow variation was 334 m3/s, and the variations in water surface width and velocity during reservoir operation were between natural conditions. The maximum daily water level variations under the two operating scenarios were 1.6 m and 3.5 m respectively. The remarkable change of water level may have a negative impact on aquatic organisms. Considering the daily variation limit of 1.2 m under natural condition, the relationship between the allowable daily variation of reservoir outflow and the reference base flow was proposed. The results in this paper serve as a technical reference for studying changes in the hydrological regime and lessening their impacts on aquatic organisms in hydro-photovoltaic complementary development.
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Fomin, Oleksij, Gregori Boyko, Andrii Lytvynenko, and Vladyslav Bezlutsky. "Analysis of the temperature effect on the stress-strain state of the tank car boiler during steaming." In ASSESSMENT OF TECHNICAL CONDITION: MEANS OF MEASUREMENT, SAFETY, RISKS. TECHNOLOGY CENTER PC, 2024. https://doi.org/10.15587/978-617-8360-05-4.ch1.
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Uninterrupted transportation of bulk fuel and lubricant cargoes is one of the main tasks facing the railway transport of Ukraine. At the same time, the nomenclature (light and dark petroleum products, fuel oils) of bulk cargoes and the limited number (due to the obsolescence of the existing fleet of tank cars and the inability to renew them in military conditions) of the corresponding rolling stock require constant and high-quality cleaning of tank car boilers. This is due to the need for prompt use of tank cars for the transportation of various types of cargo. Modern boiler cleaning technologies are associated with the application of temperature loads to their boilers, namely with washing and steaming operations. This directly affects the stress-deformed state of tank car boilers. Which, in turn, determines the need for scientific research to determine the temperature effect on the stressed-deformed state of the tank car boiler during washing and steaming operations. It was the solution of such a scientific and applied task that became the goal of research, the results of which are presented in this section of the monograph. To achieve the set goal, the following scientific and applied tasks were defined and solved. The existing information sources on the relevant topic were analyzed. Next, the technical description and requirements for modern designs of tank cars and their boilers are presented. Then, the used and adapted moment theory of shells is presented. On the basis of this mathematical theory, the load values at the control points of the tank car boiler are determined. Based on these results, the calculation model built in a modern computer computing and software complex was adjusted. Which was calculated using the finite element method and brought to an adequate level. The developed adequate finite element model includes the optimal number of finite elements and nodes: 10 182 768 elements and 18 655 084 nodes. Tetrahedrons and triangles are used as finite elements. With the use of the developed adequate finite-element model, temperature load calculations and simulation of the application of hot steam were carried out. At the same time, the temperature of hot steam is 160 °C, and the calculation period is 20 minutes. As a result of the calculations, it was found that the maximum heating temperature of the boiler is 71.3 °C when the temperature is loaded with steam. On the basis of the obtained results of temperature simulations, the input data for determining the stress-strain state of the tank car boiler were formed. The results of the calculations made it possible to establish that the maximum stress values are 173 MPa and do not exceed the permissible values. That is, when washing and steaming operations are carried out, the strength condition is fulfilled. The obtained results of simulations of temperature loads and the stress-strain states corresponding to them will be useful in conducting further research and development works on the selected topic. In addition, the obtained results and achievements can be used in educational activities in the preparation of students of various levels of education.
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Zhu, Long, Xiaodong Wang, Yue Huang, Benqin Liu, and Zhonghua Li. "Study on Classification Arrangement and Hydraulic Characteristics of Water-Saving Ship Lock Under Ultra-high Head." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_137.
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AbstractThe ship lock with water saving basins can store part of water during the operation, which has the outstanding advantage of saving water resources. At the same time, the water-saving ship lock can divide the total water head into stages, significantly reduce the operating head of each stage, which can provide technical conditions for simplifying the ship lock’s filling & emptying system and improving the operating conditions of lock’s valves. For ship lock with high head and large water level variation, the layout of the saving basins and the division of water level are very important. They determine the overall layout, operation efficiency and safety performance of the ship lock. With the increase of water head and water level variation, the classification arrangement of water-saving ship lock will become very complex. Therefore, based on the Baishi water-saving ship lock project (60 m-class, ultra-high head), the analysis and calculation research are carried out in this paper. First of all, the influence laws of key factors such as water-saving rate, number of water saving basins, area of water saving basins and operating head on water level division are obtained. On this foundation, a reasonable water level classification scheme for 60m-class ship lock is proposed, and the hydraulic characteristics of ship lock under different operating conditions are analyzed, and the feasibility of ship lock layout scheme is demonstrated. The research results can provide direct technical support for Baishi ship lock project, and provide reference for the design and construction of similar water-saving ship lock projects.
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Aliev, Telman, and Naila Musaeva. "Techniques for Determining the Operational and Non-operation Condition of a Technical Facility Based on Estimates of the Relationship Between the Useful Signal and the Noise." In Communications in Computer and Information Science. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-73417-5_2.
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Geiger, Franz, Peter Rutschmann, and Ulli Stoltz. "Measures to Improve Fish Passage Through a Turbine." In Novel Developments for Sustainable Hydropower. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99138-8_10.
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AbstractThis chapter focuses on the topic of measures to improve the fish passage through a turbine. Based on applications at the bulb units of the FIThydro Testcases of Guma, Bannwil and Obernach cost efficient and simple to apply measures are analysed. In the following two methods are presented. Applying a numerical analysis of the downstream fish passage typical physical stressor variables as strike, shear and barotrauma can be identified and correlated to the biological impact on the fish. In the FIThydro project, Voith applied the method to a wide range of operating conditions to derive fish-passage hill-charts. These allow a judgment of the physical impact on fish, dependent on the operating condition of the turbine. The studies at the Obernach lab performed by the team of the Technical University of Munich, show another method to improve fish survival rates by influencing fish pathways through the turbine. These promising results can be used for the Induced Drift Application (IDA), which are described in detail.
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Stefaniak, Pawel K., Radoslaw Zimroz, Pawel Sliwinski, Marek Andrzejewski, and Agnieszka Wyłomanska. "Multidimensional Signal Analysis for Technical Condition, Operation and Performance Understanding of Heavy Duty Mining Machines." In Applied Condition Monitoring. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20463-5_15.
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Zhang, Tieling, Richard Dwight, and Khaled El-Akruti. "Condition Based Maintenance and Operation of Wind Turbines." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09507-3_87.
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Liu, X. F., N. P. Li, Y. G. Lei, and M. Y. Wang. "Condition monitoring of bearings based on optimal weight impulse extraction." In Equipment Intelligent Operation and Maintenance. CRC Press, 2025. https://doi.org/10.1201/9781003470076-19.
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Loktev, Alexey, Petr Sychev, Vladimir Aksenov, Alexander Pikalov, and Vyacheslav Sychev. "Simulation of the Track Machinery Technical Condition to Ensure Safe Operation." In Lecture Notes in Networks and Systems. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11051-1_13.
Full textConference papers on the topic "Operation based on technical condition"
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Ismail, D. "Integrated Process Safety Tools for Managing Risk of Abnormal Operations Condition in Medco E&P." In Digital Technical Conference. Indonesian Petroleum Association, 2020. http://dx.doi.org/10.29118/ipa20-f-233.
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Process safety is paramount for the oil and gas industry including Medco E&P. Process Safety is essential to prevent major incidents that may have significant impacts in terms of economic loses, environmental damage, and even human loss. Having a strong Asset and Operating integrity programs is a key to carrying out a strong process safety in day-to-day operations. One element in asset and operations integrity that contributes to delivering a safe operations is managing abnormal operation conditions. Abnormal operation condition is defined as operations with process/system/equipment anomaly because they are outside the safe operating limit (SOL), safety critical equipment (SCE) performance degradation, SCE integrity failure, and disable safety protected function. In Medco E&P, abnormal operations risk have been assessed and managed by several tools or systems such as Safety Critical Element Abnormal Risk Assessment (SCEARA), Integrated Anomaly Alert Notification (IAAN) and SCE Preventive and Corrective Maintenance (SCE PM & CM) deferment process. These tools are made as an effort in case of continuous operations under abnormal conditions is intended by minimizing residual risk to a tolerable level. These tools are implemented by online system in Medco E&P’s enterprise resource planning, known as Business Process Management (BPM). The findings reported from the audit and self-assessment showed that it is perplexing to monitor and track between the correlated systems. This later encouraged the integration of the above tools for better abnormal operation risk management. The integration of the system then introduced as Integrated Process Safety Tools. The Integrated Process Safety Tools adds values to the management of abnormal conditions by reducing overlapping processes in the business process flow, facilitating monitoring and mitigation control, and aligning the SCE deviation mitigation periods based on risks; ranging from report initiation, work order planning until deferment processes and also clear commitment to complete abnormality. Integrated Process Safety Tools are designed to be one of the foundations in building awareness and culture of Process Safety within the Company. This paper shares the experience in managing abnormal operation condition in Medco E&P offshore operations assets both surface facility and subsurface facility that associated with Safety Critical Equipment (SCE) and its enhancement through The Integrated Process Safety Tools. The Integrated Process Safety Tools adds values to the management of abnormal conditions by reducing overlapping processes in the business process flow, simplify monitoring and mitigation control, and aligning the SCE deviation mitigation periods based on risks; ranging from report initiation, work order planning until deferment processes, also clear commitment to complete abnormality.
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Vladova, A. "Identification Method of Oil Pipelines Technical Condition Based Upon Multigraph Models." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33429.
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The problem of technical condition identification of aging oil pipelines in Russian Federation and in the world is relevant, since a significant number of them have been in service for over 30 years. More and more of them are getting closer to running out of normative resources. Within a method for reducing the size of task of identifying the technical condition of oil pipelines there were created special types of multigraph models (MGM) with interval-valued states of geometric characteristic of metallic shell defects. Depending on oil pipelines operation time, the behavior of proposed models has been examined and operating performance with due account for technical condition identification has been determined, also the possibility of diminishing scope of inspections and repair works was shown. Multigraph models proposed here contain a set of states, which were singled out for the first time according to the analogue variable and are connected with multidirectional arcs with intensities of damage calculated on the relative amount of defects in the states.
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Lauer, Martin, Jens Färber, Frank Reiß, and Jaman El Masalme. "Model Based Prediction of Off-Design Operation Condition NOx Emission From DLE Gas Turbine Combustors." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63063.
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In this paper a semi-empirical method is presented to predict the NOX emission of a pilot stabilized, technically premixed gas turbine combustor for arbitrary combustor inlet conditions. The method is based on measurement data for a reference operation cycle and ISO ambient condition. A model based correction function is used to account for the change of NOX emission, which results from combustor inlet condition and/or operation cycle deviating from reference data. The proposed method assumes that a pilot stabilized, technically premixed flame can be simplistically modeled as two separate combustion regimes: An assumed perfectly premixed regime, and an assumed diffusion flame regime. The emission of the combustor is then modeled as a superposition of the emissions from both individual combustion regimes. The emissions from the diffusion flame regime are the dominant contribution, although only a comparably small share of fuel is burnt in this regime. The emission of the perfectly premixed combustion regime can be modeled as a sole function of flame temperature. On the other hand, the emissions from the diffusion regime are strongly affected by combustor inlet pressure and temperature, which are in turn a function of the gas turbine operation cycle and inlet conditions. To simplify matters, only the change in NOX emission from the diffusion regime, which results from deviation of combustor inlet pressure and/or temperature from values expected for a reference operation cycle and ISO ambient condition, is modeled. NOX emission data for this reference operation cycle is necessary experimental input for the method. The proposed method can — with minimum experimental input — predict the NOX emission of a pilot stabilized, technically premixed combustor with good accuracy for arbitrary engine operation cycles and inlet conditions. It is aimed at providing reliable NOX emission estimates without the need for time intensive CFD or expensive experimental investigations. Typical applications are the assessment of a gas turbine’s NOX potential for feasibility studies of new operation or engine concepts with a proven combustor design, and for NOX estimates for out-of-experience ambient or site conditions for existing engines.
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Mauricio, Alexandre, Shuangwen Sheng, and Konstantinos Gryllias. "Condition Monitoring of Wind Turbine Planetary Gearboxes Under Different Operating Conditions." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91136.
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Abstract Digitally enhanced services for wind power could reduce Operations and Maintenance (O&M) costs as well as the Levelised Cost Of Energy (LCOE). Therefore, there is a continuous need for advanced monitoring techniques which can exploit the opportunities of Internet of Things (IoT) and Big Data Analytics, revolutionizing the future of the energy sector. The heart of wind turbines is a rather complex epicyclic gearbox. Among others, extremely critical gearbox components which are often responsible for machinery stops are the rolling element bearings. The vibration signatures of bearings are rather weak compared to other components, such as gears, and as a result an extended number of signal processing techniques and tools have been proposed during the last decades, focusing towards accurate, early, and on time bearing fault detection with limited false alarms and missed detections. Envelope Analysis is one of the most important methodologies, where an envelope of the vibration signal is estimated usually after filtering around a frequency band excited by impacts due to the bearing faults. Different tools, such as Kurtogram, have been proposed in order to accurately select the optimum filter parameters (center frequency and bandwidth). Cyclic Spectral Correlation and Cyclic Spectral Coherence, based on Cyclostationary Analysis, have been proved as very powerful tools for condition monitoring. The monitoring techniques seem to have reached a mature level in case a machinery operates under steady speed and load. On the other hand, in case the operating conditions change, it is still unclear whether the change of the monitoring indicators is due to the change of the health of the machinery or due to the change of the operating parameters. Recently, the authors have proposed a new tool called IESFOgram, which is based on Cyclic Spectral Coherence and can automatically select the filtering band. Furthermore, the Cyclic Spectral Coherence is integrated along the selected frequency band leading to an Improved Envelope Spectrum. In this paper, the performance of the tool is evaluated and further extended on cases operating under different speeds and different loads. The effectiveness of the methodology is tested and validated on the National Renewable Energy Laboratory (NREL) wind turbine gearbox vibration condition monitoring benchmarking data set which includes various faults with different levels of diagnostic complexity as well as various speed and load operating conditions.
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Ivanov, Sergey A., and Alexander I. Rybnikov. "Fatigue Strength and Metal Condition in the Context of Gas Turbine Buckets Life Extension." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-70121.
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Criteria for remaining life estimation and methods for enhancing fatigue resistance of heavy-duty gas turbine bucket metal are based on the analysis of changes in the structure and properties of metal after long-term operation. High-cycle fatigue (HCF) resistance is shown to be a decisive characteristic in the residual life estimation of turbine buckets after operation over 100,000 hours. The tests of the buckets from cast and wrought nickel-based alloys after long-term operation demonstrated decreasing of fatigue strength by up to 25%. The metal structure in operation undergoes notable deterioration mainly in phase redistribution. The size and configuration of metal phases are changing also. It caused the changes in metal properties. The decrease of the bucket fatigue strength correlates with the decrease of metal ductility. The reconditioning heat treatment resulted in restoring mechanical properties of metal. The fatigue resistance also increased nearly to the initial level. The influence of operational factors on bucket fatigue strength deterioration has been established. The mechanical damages on bucket airfoil may decrease the fatigue resistance. We found the correlation of endurance limit and damages depth. The procedures for metal properties recovering and buckets service life substantial extension have been developed. It has resulted in the extension of the buckets service life by up to 50% over the assigned life in gas turbines operated by Gazprom.
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Mauricio, Alexandre, Linghao Zhou, David Mba, and Konstantinos Gryllias. "Vibration Based Condition Monitoring of Helicopter Gearboxes Based on Cyclostationary Analysis." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91150.
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Abstract The core of a helicopter drivetrain is a complex planetary main gearbox (MGB) which reduces the high input speed generated by the engines in order to provide the appropriate torque to the main rotors and to other auxiliary systems. The gearbox consists of various shafts, planetary gears and bearings and operates under varying conditions under excessive friction, heat and high mechanical forces. The components are vulnerable to fatigue defects and therefore Health and Usage Monitoring Systems (HUMS) have been developed in order to monitor the health condition of the gearbox, focusing towards early, accurate and on time fault detection with limited false alarms and missed detections. The main aim of a HUM System is by health monitoring to enhance the helicopters’ operational reliability, to support the maintenance decision making, and to reduce the overall maintenance costs. The importance and the need for more advanced and accurate HUMS have been emphasized recently by the post-accident analysis of the helicopter LN-OJF, which crashed in Norway in 2016. During the last few decades various methodologies and diagnostic indicators/features have been proposed for the monitoring of rotating machinery operating under steady conditions but still there is no global solution for complex structures. A new tool called IESFOgram has been recently proposed by the authors, based on Cyclostationary Analysis, focusing on the accurate selection of a filtering band, under steady and varying speed conditions. Moreover the Cyclic Spectral Coherence is integrated along the selected frequency band leading to an Improved Envelope Spectrum. In this paper the performance of the tool is tested on a complex planetary gearbox, with several vibration sources. The method is tested, evaluated and compared to state of the art methods on a dataset captured during experimental tests under various operating conditions on a Category A Super Puma SA330 main planetary gearbox, presenting seeded bearing defects of different sizes.
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Turner, Cameron J., Abiola M. Ajetunmobi, and Richard H. Crawford. "Fault Detection With NURBs-Based Metamodels." In ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/detc2006-99637.
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Developing the ability for a system to self-monitor its condition is a desirable feature in many modern engineering systems. This capability facilitates a maintenance-as-needed rather than a maintenance-as-scheduled paradigm, offering potential efficiency improvements and corresponding cost savings. By using continuously updated Non-Uniform Rational B-spline (NURBs) metamodels of system performance to monitor the system condition, the onset of incipient faults can be detected by comparison to a self-generated as-built system metamodel, providing a basis for determining off-normal operating conditions. This capability is demonstrated for three distinct fault conditions prevalent in brushless DC motors. The results show that this technique can be used to develop an as-built system metamodel, develop a current system model during system operation, and detect the presence of an incipient fault condition despite the compensation provided by a feedback control system.
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Sivaraman, P., P. Ilakiya, M. K. Prabhu, and Adarsh Ajayan. "Real-Time Gearbox Defect Detection Using IIoT-Based Condition Monitoring System." In Automotive Technical Papers. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-5057.
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<div class="section abstract"><div class="htmlview paragraph">In order to guarantee the dependability and effectiveness of industrial machinery, real-time gearbox malfunction detection is extremely important. Traditional approaches to condition monitoring systems sometimes rely on time-consuming human inspections or routine maintenance, which can result in unanticipated failures and expensive downtime. The rise of the industrial Internet of things (IIoT) in recent years has paved the way for more sophisticated and automated monitoring methods. An IIoT-based condition monitoring system is suggested in this study for real-time gearbox failure detection. The gearbox health state is continually monitored by the system using sensor data from the gearbox, such as temperature, vibration, and oil analysis. Real-time transmission of the gathered data is made to a central monitoring hub, where sophisticated analytics algorithms are used to look for any flaws.</div><div class="htmlview paragraph">This study’s potential to improve the dependability and operational effectiveness of industrial gear is what makes it so significant. Real-time defect identification makes it possible to undertake maintenance tasks preemptively, avoiding catastrophic failures and cutting down on downtime. This reduces not just the expenses of unanticipated maintenance but also boosts general productivity and client happiness. The uniqueness of this study comes from the way sophisticated analytics and IIoT technologies were used to find gearbox defects. Despite the literature’s exploration of IIoT-based condition monitoring systems, this work focuses especially on gearbox defect detection, which presents special difficulties because of complicated mechanical dynamics and the existence of several failure scenarios. The suggested methodology provides a thorough and automated method that can precisely identify and diagnose gearbox faults, leading to timely maintenance actions and increased operational reliability. Overall, employing IIoT-based condition monitoring, this work offers a unique and useful method for real-time gearbox failure diagnosis. The results of this study can help improve industrial maintenance procedures, which will enhance machinery performance and decrease downtime across a variety of industries, including manufacturing, energy, and transportation.</div></div>
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Witz, Grégoire, and Hans-Peter Bossmann. "Determination of Thermal Barrier Coatings Average Surface Temperature After Engine Operation for Lifetime Validation." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68122.
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Assessment of ex-service parts is important for power generation industry. It gives the opportunity to correlate part conditions to specific operating conditions like fuel used, local atmospheric conditions, operating regime, and temperature load. For assessment of thermal barrier coatings, one of the most valuable information is the local thermal condition. A method has been developed in Alstom, allowing determination of a thermal barrier coating average surface temperature after engine operation. It is based on the analysis of the phase composition of the thermal barrier coating by the acquisition of an X-Ray diffraction spectrum of the coating surface, and its analysis using Rietveld refinement. The method has been validated by comparing its outcome to thermal models and base metal temperature mapping data. It is used for assessment of combustor and turbine coatings with various purposes: determination of remnant coating life, building of lifing models, or determination of the coating degradation mechanisms under some specific operating conditions. Examples will be presented showing applications of this method.
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Ghazi Mir Saied, S. Ahmad, S. Ali Jazayeri, and Amir H. Shamekhi. "Modeling of Variable Intake Valve Timing in SI Engine." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1411.
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In internal combustion engines valve events and timings are among the most important parameters which have a major influence on the engine’s operation and volumetric efficiency. By using camless valvetrain strategy, improvement in fuel economy as well as an increase in entering air charge is found throughout the engine map with the largest benefits arising from low speed operating conditions. The system offers a continuously variable and independent control of virtually all parameters of valve motion. This permits optimization of valve events for each operating condition without any compromise. In this paper we describe a phenomenological model for an unthrottled operation of a camless intake process of spark-ignited (SI) engine. Initially the cylinder breathing dynamics is modeled and results are validated with experimental data of a conventional engine with cam-driven valve profile during unthrottled operation. Then we determine the most optimized intake valve profile in order to have the most volumetric efficiency and proper operation for each operating condition based on the existing model and using numerical techniques.
Reports on the topic "Operation based on technical condition"
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Leech, James. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers : Red and Atchafalaya Rivers AdH model. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45165.
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The Red River, Atchafalaya River, and the Old River Control Complex (ORCC) Outflow Channel Adaptive Hydraulics two-dimensional depth averaged sediment model (AdH-2D-SED) was used to evaluate the short-term and system-wide sedimentation effects of modifying the operation schedule at ORCC. The changes evaluated were increasing and decreasing the percentage of flow that is diverted to the Atchafalaya River from the Mississippi River at the ORCC and modifying the distributions through four ORCC structures. Sedimentation effects for several operation scenarios were compared to a Base condition for each water year that represented the existing operation protocols. Four dredging scenarios were developed and analyzed. Additionally, two structure options were developed and analyzed. The scenario analyses presented in this report are intended to identify large trends and to make gross assessments of the potential impacts of various proposed operational changes to the ORCC.
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Copeland, Ronald, and James Lewis. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers: Mississippi River HEC-6T model. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45160.
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The HEC-6T 1D numerical sedimentation model was used to evaluate the long-term and system-wide sedimentation effects of modifying the operation schedule at the Old River Control Complex (ORCC). The changes evaluated were the increase and decrease of the percentages of flow diverted from the Mississippi River at the ORCC and the modification of the distributions through the four ORCC structures. Also evaluated were dredging scenarios that removed sediment from the bed of the Mississippi River at the ORCC. Sedimentation effects for several operation and dredging scenarios were compared to a Base Condition that represented the existing operation protocols. The predictive simulations extended for 50 years. The model was used to calculate and compare sand transport past various gages along the Mississippi River and in the Outflow Channel. Dredging volumes at the deep-draft crossings and in Southwest Pass and above Head of Passes were compared. Differences in water-surface profiles in the vicinity of ORCC were determined.
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Donohue, Patrick, Ronald Copeland, and James Lewis. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers : Atchafalaya River HEC-6T model. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45161.
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The HEC-6T one-dimensional numerical sedimentation model was used to evaluate the long-term and system-wide sedimentation effects of modifying the operation schedule at the Old River Control Complex (ORCC). The changes evaluated were increasing and decreasing the percentage of flow that is diverted to the Atchafalaya River from the Mississippi River at the ORCC and modifying the distributions through the four ORCC structures. Sedimentation effects for several operation scenarios were compared to a Base Condition that represented the existing operation protocols. Additionally, a dredging scenario was developed and analyzed. This scenario featured dredging material from the Mississippi River and depositing it into the Outflow Channel, downstream of the ORCC. The predictive simulations extended for 50 years. The model was used to calculate and compare sand transport past various gages along the Atchafalaya River. Also, the model compared differences in water surface elevations and bed elevations using a specific gage analysis at several gages along the Atchafalaya River. Last, the effects of the various scenarios on annual dredging requirements in Berwick Bay were also determined.
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Lindig, Sascha, Julien Deckx, Magnus Herz, et al. Technical Key Performance Indicators for Photovoltaic Systems: Challenges and Best Practices. International Energy Agency Photovoltaic Power Systems Programme, 2024. https://doi.org/10.69766/luzi3108.
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Key Performance Indicators (KPIs) are an important set of metrics used to assess various aspects of photovoltaic (PV) systems, including their long-term performance, economic viability and carbon footprint. Technical KPIs support data-driven and informed decision-making when optimizing PV systems and provide a comprehensive overview of how PV systems operate across different conditions and climates. Different KPIs are commonly employed throughout the entire value chain of PV projects and can be categorized into technical, economic and sustainability aspects. In this work, a set of best practices for handling PV system data to reliably calculate relevant KPIs is discussed. While most technical KPIs are generally well-known among asset owners, EPCs, O&M providers and consultants, not all stakeholders in the financing-to-operation chain are equally aware of the nuances and consequences of certain decisions, which are based on how technical KPIs are operationalized, i.e. translated from contracts to how and where raw data are stored, which data cleaning and imputation techniques are used, to how the technical KPIs are calculated and used for subsequent decision-making. In many cases, the decisions made in the development-to-construction phase, will affect the asset for a significant part of its lifetime. For example, the resolution at which data is measured, which data are stored, or whether data back-ups are on-site or in the cloud, can all affect how KPIs are calculated, affect future modifications to contractual clauses, or the need for SCADA upgrades. Hence, this work aims to provide all stakeholders deeper insights and a shared understanding of the most important technical KPIs. The work is divided into three parts, each addressing different aspects of KPIs, data management, and their mapping potential
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Li, Honghai, Mitchell Brown, Lihwa Lin, et al. Coastal Modeling System user's manual. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48392.
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The Coastal Modeling System (CMS) is a suite of coupled 2D numerical models for simulating nearshore waves, currents, water levels, sediment transport, morphology change, and salinity and temperature. Developed by the Coastal Inlets Research Program of the US Army Corps of Engineers, the CMS provides coastal engineers and scientists a PC-based, easy-to-use, accurate, and efficient tool for understanding of coastal processes and for designing and managing of coastal inlets research, navigation projects, and sediment exchange between inlets and adjacent beaches. The present technical report acts as a user guide for the CMS, which contains comprehensive information on model theory, model setup, and model features. The detailed descriptions include creation of a new project, configuration of model grid, various types of boundary conditions, representation of coastal structures, numerical methods, and coupled simulations of waves, hydrodynamics, and sediment transport. Pre- and post-model data processing and CMS modeling procedures are also described through operation within a graphic user interface—the Surface- water Modeling System.
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Goss, Nicholas, Brad Diggans, Francis Lukaczyk, et al. Integrated Risk-Informed Condition Based Maintenance Capability and Automated Platform: Technical Report 1. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/2204687.
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Peterson, Warren. PR-663-19600-Z01 Develop Guidance for Calculation of HCDP in Pipelines. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011659.
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To maintain the integrity and reliability of natural gas transportation systems, system operators ensure that products in transit remain in the gas phase under foreseeable operating conditions. Compliance with pipeline hydrocarbon dew point (HCDP) specifications are demonstrated though in-situ testing or predictive models based on Equations of State (EOS) calculations. Numerical prediction of HCDP is a product of contributing elements, including gas chromatography, calibration gas quality, thermophysical science and the experimental data that underpins equations of state. Some hydrocarbon mixtures, such as those from non-traditional gas supplies, are more difficult to sample and assess than others. The methods described in this paper and accompanying spreadsheet examples are designed to assist persons in making technically defendable decisions with respect to predictive methods and the operational impacts of liquid dropout. The primary focus of this work is to connect the over-all performance of HCDP prediction to its operational implications. The secondary objective of the work is to provide tools for assessing the potential benefit from using C9+ versus C6+ gas chromatographs.
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Kharkivska, Alla A., Liudmyla V. Shtefan, Muntasir Alsadoon, and Aleksandr D. Uchitel. Technology of forming future journalists' social information competence in Iraq based on the use of a dynamic pedagogical site. [б. в.], 2020. http://dx.doi.org/10.31812/123456789/3853.
Full textAbstract:
The article reveals scientific approaches to substantiating and developing technology to form social information competence of future Iraqi journalists based on using a dynamic pedagogical site. After pre-interviewing students of the Journalism Faculty at Al-Imam Al-Kadhim University College for Islamic Sciences in Baghdad, the authors came to the conclusion there are issues on defining the essence of social information competences. It is established that the majority of respondents do not feel satisfied with the conditions for forming these competences in the education institutions. At the same time, there were also positive trends as most future journalists recognized the importance of these professional competences for their professional development and had a desire to attend additional courses, including distance learning ones. Subsequently, the authors focused on social information competence of future journalists, which is a key issue according to European requirements. The authors describe the essence of this competence as an integrative quality of personality, which characterizes an ability to select, transform information and allows to organize effective professional communication on the basis of the use of modern communicative technologies in the process of individual or team work. Based on the analysis of literary sources, its components are determined: motivational, cognitive, operational and personal. The researchers came to the conclusion that it is necessary to develop a technology for forming social information competence of future journalists based on the use of modern information technologies. The necessity of technology implementation through the preparatory, motivational, operational and diagnostic correction stages was substantiated and its model was developed. The authors found that the main means of technology implementation should be a dynamic pedagogical site, which, unlike static, allows to expand technical possibilities by using such applications as photo galleries, RSS modules, forums, etc. Technically, it can be created using Site builder. Further research will be aimed at improving the structure of the dynamic pedagogical site of the developed technology.
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David, Gabrielle, D. Somerville, Julia McCarthy, et al. Technical guide for the development, evaluation, and modification of stream assessment methods for the Corps Regulatory Program. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42182.
Full textAbstract:
The U.S. Army Corps Regulatory Program considers the loss (impacts) and gain (compensatory mitigation) of aquatic resource functions as part of Clean Water Act Section 404 permitting and compensatory mitigation decisions. To better inform this regulatory decision-making, the Regulatory Program needs transparent and objective approaches to assess the function and condition of aquatic resources, including streams. Therefore, the Regulatory Program needs function-based stream assessments (1) to characterize a stream’s condition or function, (2) to improve understanding of the impact of a proposed action on an aquatic resource, and/or (3) to inform the development of stream compensatory mitigation tools rooted in stream condition and/or function. A function-based stream assessment can provide regulatory decision makers with the resources to objectively consider alternatives, minimize impacts, assess unavoidable impacts, determine mitigation requirements, and monitor the success of mitigation projects. A multiagency National Committee on Stream Assessment (NCSA) convened to create these guidelines to inform the development of new methods and evaluation of both national-level and regional methods currently in use. The resulting guidelines present nine phases, including rationale and recommendations to facilitate work efforts. The NCSA hopes that this technical guide promotes transparency, technical defensibility, and consistent application of stream assessments in the Regulatory Program.
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Hellwig, Runa T., Despoina Teli, Marcel Schweiker, et al. Guidelines for low energy building design based on the adaptive thermal comfort concept - Technical report: IEA EBC Annex 69: Strategy and Practice of Adaptive Thermal Comfort in Low Energy Buildings. Aalborg University, 2022. http://dx.doi.org/10.54337/aau510903564.
Full textAbstract:
The adaptive thermal comfort concept has been developed over many years and proven in numerous field studies (e.g. Webb 1964, Nicol and Humphreys 1973, Auliciems 1981b, de Dear et al. 1997, McCartney and Nicol 2002, Manu et al. 2016), showing that people are satisfied with a wide range of thermal conditions. Prerequisite is that people are provided with means to make themselves comfortable, that they know which opportunities they have, that it is socially acceptable to use these opportunities and that they are willing to use them (Hellwig, 2015). However, the overall understanding of how to design for such opportunities enabling the occupant to make themselves comfortable in relation to climate and building type, thus how to convert the adaptive thermal comfort concept into building design and concepts for operating buildings, is still limited. There are still common misunderstandings in the interpretation of the adaptive comfort approach among building planners and operators e.g. regarding the amount of control, the seriousness of this topic or the level of information needed by occupants for which reason guidance (e.g. CIBSE 2010, Cook et al. 2020) and knowledge transfer (e.g. Hellwig and Boerstra 2017, 2018) is absolutely essential. Consequently, there is still a gap between scientific research and real-world-application, which this report aims to diminish.