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Journal articles on the topic 'Maintenance – Mathematical models'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Scarf, Philip A. "On the application of mathematical models in maintenance." European Journal of Operational Research 99, no. 3 (1997): 493–506. http://dx.doi.org/10.1016/s0377-2217(96)00316-5.

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2

Christer, A. "Editorial. Third IMA International Conference on Mathematical Models in Maintenance." IMA Journal of Management Mathematics 9, no. 2 (1998): 89–90. http://dx.doi.org/10.1093/imaman/9.2.89.

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3

Minaev, V. A., V. M. Pizengolts, A. O. Faddeev, A. Y. Bystryakov, E. V. Savenkova, and E. V. Kruglikova. "Modern information and mathematical models in construction industry." E3S Web of Conferences 116 (2019): 00051. http://dx.doi.org/10.1051/e3sconf/201911600051.

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Building information modelling (BIM) – new technology of construction object information maintenance. It allows specifying influence of changes and risks made in it (including geodynamic) at all stages of lifecycle. Objects include products, building equipment, technological platform, the building, engineering, transportation networks and systems of building communication. The model expands possibilities of innovative technologies implementation, allowing creating reasoned economic decisions.

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4

Aberšek, Boris, and Jože Flašker. "Mathematical Modelling of Service Life Prediction as a Part of the Maintenance Process." Key Engineering Materials 417-418 (October 2009): 913–16. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.913.

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In this paper, the concepts of preventive maintenance are pres¬ented in first part, and second part of the paper present several mathematical models for prediction service life as a base for preventive maintenance forecasting. These models aid in determining the frequency of inspec¬tions that will allow the condition of a piece of equipment to be determined in order to plan an appropriate maintenance action. The problem of determination of the service life is directly related to geometry, multiaxial loadings, materials and appropriate models for prediction of the failure propagation. The more

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5

Samulenkov, Yu I., Ya A. Filatova, and A. D. Gruzd. "Aircraft maintenance system simulation mathematical model construction." Civil Aviation High Technologies 24, no. 4 (2021): 38–49. http://dx.doi.org/10.26467/2079-0619-2021-24-4-38-49.

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The development of the aviation transport system is characterized by sophistication of interacting objects, the multi-criteria nature of the tasks to be solved and difficulties in making management decisions. For example, modern medium haul aircraft are fitted with up to 25,000 sensors to monitor the performance capabilities of functional systems components. Numerous ground-based instrumental methods and means of diagnosing the technical condition are used. This requires the development of methods and algorithms for determining and monitoring the criteria of limiting state of the monitored com

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Bai, Yong Sheng, Xi Sheng Jia, Yan Tian, and Zhong Hua Cheng. "The Optimal Cost Model of Compound Maintenance for Multi-Component Systems." Applied Mechanics and Materials 26-28 (June 2010): 886–91. http://dx.doi.org/10.4028/www.scientific.net/amm.26-28.886.

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The maintenance tasks in present studies for the maintenance optimization of multi-component systems are mostly simplex, while the compound maintenance that integrates several kinds of maintenance types existing in practice are seldom studied. To optimize the compound maintenance intervals of multi-component systems, the group maintenance strategy was introduced in this paper, the maintenance cost structure and composition were analyzed from system point of view, and the mathematical models were established for expected maintenance cost per unit time. Finally, a numerical example was illustrat

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7

Nguyen, Th, and T. Nguyen. "MATHEMATICAL MODELS FOR THE MATERIAL SUPPLY MANAGEMENT BASED ON THE INTEGRATED LOGISTICS SUPPORT APPROACH." National Association of Scientists 1, no. 69 (2021): 22–27. http://dx.doi.org/10.31618/nas.2413-5291.2021.1.69.457.

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Integrated Logistics Support (ILS) is disciplined and unified management including activities in product life cycle management to create a product maintenance system (MS) to support the product throughout its intended life cycle at an acceptable cost. Along with information models combining product descriptions such as breakdowns, fault trees and methods of restorations, etc., mathematical models considered effective tools to get optimal results are proposed. The paper will present mathematical models, which play important roles in assessing and estimating material demand (spare parts), for th

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Raza, Ahmed, and Vladimir Ulansky. "Optimization of Condition Monitoring Decision Making by the Criterion of Minimum Entropy." Entropy 21, no. 12 (2019): 1193. http://dx.doi.org/10.3390/e21121193.

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Condition-based maintenance (CBM) is a promising technique for a wide variety of deteriorating systems. Condition-based maintenance’s effectiveness largely depends on the quality of condition monitoring. The majority of CBM mathematical models consider perfect inspections, in which the system condition is assumed to be determined error-free. This article presents a mathematical model of CBM with imperfect condition monitoring conducted at discrete times. Mathematical expressions were derived for evaluating the probabilities of correct and incorrect decisions when monitoring the system conditio

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9

Cheng, Yuan. "Predictive Analysis on Maintenance of Mining Dump Truck." Applied Mechanics and Materials 340 (July 2013): 848–51. http://dx.doi.org/10.4028/www.scientific.net/amm.340.848.

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Collected a large number of data from 2003to 2011 of maintenance cost for mining dump truck, established the mathematical models of maintenance cost and forecast of economic life of mining dump truck through the method of mathematical statistics regression analysis, found the rule of operation, maintenance cost overhaul and renew, forecasted the economic life of mining dump truck scientifically for 11 years, according to the economic principle of overhaul , judged whether need third overhaul and provided a basis for evaluating the economic life of domestic mine use electric wheel trucks.

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10

Merizalde, Yuri, Luis Hernández-Callejo, Oscar Duque-Perez, and Víctor Alonso-Gómez. "Maintenance Models Applied to Wind Turbines. A Comprehensive Overview." Energies 12, no. 2 (2019): 225. http://dx.doi.org/10.3390/en12020225.

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Wind power generation has been the fastest-growing energy alternative in recent years, however, it still has to compete with cheaper fossil energy sources. This is one of the motivations to constantly improve the efficiency of wind turbines and develop new Operation and Maintenance (O&M) methodologies. The decisions regarding O&M are based on different types of models, which cover a wide range of scenarios and variables and share the same goal, which is to minimize the Cost of Energy (COE) and maximize the profitability of a wind farm (WF). In this context, this review aims to identify

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11

Raza, Ahmed, and Vladimir Ulansky. "Optimal Preventive Maintenance of Wind Turbine Components with Imperfect Continuous Condition Monitoring." Energies 12, no. 19 (2019): 3801. http://dx.doi.org/10.3390/en12193801.

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Among the different maintenance techniques applied to wind turbine (WT) components, online condition monitoring is probably the most promising technique. The maintenance models based on online condition monitoring have been examined in many studies. However, no study has considered preventive maintenance models with incorporated probabilities of correct and incorrect decisions made during continuous condition monitoring. This article presents a mathematical model of preventive maintenance, with imperfect continuous condition monitoring of the WT components. For the first time, the article intr

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Seyr, Helene, and Michael Muskulus. "Decision Support Models for Operations and Maintenance for Offshore Wind Farms: A Review." Applied Sciences 9, no. 2 (2019): 278. http://dx.doi.org/10.3390/app9020278.

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This paper reviews the state of the art in offshore wind farm operations and maintenance with a focus on decision support models for the scheduling of maintenance. Factors influential to maintenance planning are collected from the literature and their inclusion in state-of-the-art models is discussed. Methods for modeling and optimization are presented. The methods currently used and possible alternatives are discussed. The existing models are already able to aid the decision-making process. They can be improved by applying more advanced mathematical methods, including uncertainties in the inp

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13

RAHMAN, ANISUR. "MAINTENANCE CONTRACT MODEL FOR COMPLEX ASSET/EQUIPMENT." International Journal of Reliability, Quality and Safety Engineering 21, no. 01 (2014): 1450002. http://dx.doi.org/10.1142/s0218539314500028.

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Maintenance contracts received significant attentions in the past 15 to 20 years as it has huge potential to reduce the upfront investments in maintenance infrastructure, specialized maintenance facilities, and risks to the owners through expert services provided by the original equipment manufacturers and/or specialist maintenance providers. To make maintenance contracts more effective, there is a need to develop mathematical models and understand future costs that could be built into the contract price. In this paper, a conceptual model is developed for estimating cost of outsourcing mainten

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Kovalev, M. A., A. N. Koptev, and S. Zh Kurtayev. "STRUCTURAL METHODS FOR MODELING ORGANIZATIONAL STRUCTURES AND AIRCRAFT MAINTENANCE PROCESSES." Izvestiya of Samara Scientific Center of the Russian Academy of Sciences 22, no. 5 (2020): 8–13. http://dx.doi.org/10.37313/1990-5378-2020-22-5-8-13.

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The article considers a systematic approach to modeling the composition and relationship of elements of the structure of the service production complex and their interaction, due to the unity of goals and functions performed by them. When solving these problems, the main problem is choosing the best solution. The article implements a method based on constructing sufficiently adequate mathematical models of real objects and their functioning processes and comparing the results of research of these models.

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YEH, RUEY HUEI, and MING-YUH CHEN. "OPTIMAL PREVENTIVE-MAINTENANCE WARRANTY POLICIES FOR REPAIRABLE PRODUCTS WITH AGE-DEPENDENT MAINTENANCE COSTS." International Journal of Reliability, Quality and Safety Engineering 12, no. 02 (2005): 111–25. http://dx.doi.org/10.1142/s0218539305001720.

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This paper develops a mathematical model to derive the optimal preventive maintenance warranty (PMW) policy for repairable products with age-dependent maintenance costs. Under a PMW, any product failures are rectified by minimal repair, and additional preventive maintenance actions are carried out within the warranty period. When the costs for preventive maintenance and minimal repair are age-dependent, the optimal number of preventive maintenance actions, corresponding maintenance degrees, and the maintenance schedule for designing a PMW policy are derived here such that the expected total wa

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16

CHRISTER, A. H., R. DEKKER, and L. THOMAS. "Second IMA Mathematical Models in Maintenance Conference Issue on Mathematics Applied in Business and Industry." IMA Journal of Management Mathematics 6, no. 1 (1995): 1–3. http://dx.doi.org/10.1093/imaman/6.1.1.

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17

Xu, Dehua, Aihua Liu, and Dar-Li Yang. "Mathematical Programming Models for Competitive Two-Agent Single-Machine Scheduling with Flexible Periodic Maintenance Activities." Arabian Journal for Science and Engineering 39, no. 5 (2014): 3715–22. http://dx.doi.org/10.1007/s13369-014-1003-0.

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18

Rogers, D. M. "Network analysis models – the secret for success." Water Supply 4, no. 5-6 (2004): 383–88. http://dx.doi.org/10.2166/ws.2004.0129.

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Water is a fundamental necessity of life. Yet water supply and distribution networks the world over are old and lacking in adequate maintenance. Consequently they often leak as much water as they deliver and provide an unacceptable quality of service to the customer. In certain parts of the world, water is available only for a few hours of the day. The solution is to build a mathematical model to simulate the operation of the real network in all of its key elements and apply it to optimise its operation. To be of value, the results of the model must be compared with field data. This process is

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19

Kovalev, M. A., and I. V. Poddubniy. "Problems of modern aircraft maintenance." VESTNIK of Samara University. Aerospace and Mechanical Engineering 18, no. 2 (2019): 138–45. http://dx.doi.org/10.18287/2541-7533-2019-18-2-138-145.

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The paper presents a comparison of the legal framework and the legal work carried out in the USSR, the European Union and in the post-Soviet period in Russia. The current state of the Russian civil aviation fleet, the systems of aircraft maintenance and the main problems of civil aviation development in Russia are considered. From this consideration it follows that the number of aircraft in Russia is increasing every year, alongside with the need for their maintenance. However, the construction of maintenance systems in accordance with outdated rules and regulations makes them unviable. On the

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Da’ie, Abdul Basit. "Developing mathematical models for global solar radiation intensity estimation at Shakardara, Kabul." International Journal of Innovative Research and Scientific Studies 4, no. 2 (2021): 133–38. http://dx.doi.org/10.53894/ijirss.v4i2.68.

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Solar energy properties such as Global Solar Radiation (GSR) intensity could be determined in either methods, experimentally or theoretically. Unfortunately, in most countries including Afghanistan, the first method which is more acceptable, but due to the high cost, maintenance and calibration requirements is not available. Therefore, an alternative widely used way is the second one which is model developments based on the meteorological (atmospheric) data; specially the sunny hours. The aim of this study at Shakardara area is to estimate atmospheric transparency percentage on 2017, determini

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21

Tieu, Kevin S., Ryan S. Tieu, Julian A. Martinez-Agosto, and Mary E. Sehl. "Stem Cell Niche Dynamics: From Homeostasis to Carcinogenesis." Stem Cells International 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/367567.

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The stem cell microenvironment is involved in regulating the fate of the stem cell with respect to self-renewal, quiescence, and differentiation. Mathematical models are helpful in understanding how key pathways regulate the dynamics of stem cell maintenance and homeostasis. This tight regulation and maintenance of stem cell number is thought to break down during carcinogenesis. As a result, the stem cell niche has become a novel target of cancer therapeutics. Developing a quantitative understanding of the regulatory pathways that guide stem cell behavior will be vital to understanding how the

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22

Bazargan, Massoud. "Airline maintenance strategies – in-house vs. outsourced – an optimization approach." Journal of Quality in Maintenance Engineering 22, no. 2 (2016): 114–29. http://dx.doi.org/10.1108/jqme-08-2015-0038.

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Purpose – The purpose of this paper is to offer a new mathematical modeling approach to help airlines identify which types of heavy aircraft maintenance checks be performed in-house or outsourced. Design/methodology/approach – This study offers a mathematical model to minimize the total cost of heavy maintenance programs over a planning period subject to performing all maintenance programs on time and other side constraints. Findings – The results are very encouraging and somewhat counter-intuitive. The solutions recommend that more expensive and labor intensive checks be outsourced. A detaile

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23

Golovin, Sergey. "Representation of replacement rules in the form of a matrix." Journal of Quality in Maintenance Engineering 22, no. 2 (2016): 164–79. http://dx.doi.org/10.1108/jqme-06-2015-0022.

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Purpose – The purpose of this paper is to represent replacement policies (rules) in the form of a matrix. Visualization of replacement rules is useful for maintenance records. Matrix representation is more effective than the verbal description usually provided, as it allows better understanding of the specifics of the different replacement rules without careful research of their mathematical models. Design/methodology/approach – This approach employs mathematical models to investigate the simple conditions (requirements) for replacement of system component with illustrative examples. When comp

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Nachimuthu, Sathishkumar, Ming J. Zuo, and Yi Ding. "A Decision-making Model for Corrective Maintenance of Offshore Wind Turbines Considering Uncertainties." Energies 12, no. 8 (2019): 1408. http://dx.doi.org/10.3390/en12081408.

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Maintenance optimization has received special attention among the wind energy research community over the past two decades. This is mainly because of the high degree of uncertainties involved in the execution of operation and maintenance (O&M) activities throughout the lifecycle of wind farms. The increasing complexity in offshore maintenance execution demands applied research and brings forth a need to develop problem-specific maintenance decision-making models. In this paper, a mathematical model is proposed to assist wind farm stakeholders in making critical resource- related decisions

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McKnight, Leslie L., Secundino Lopez, Anna Kate Shoveller, and James France. "Models for the Study of Whole-Body Glucose Kinetics: A Mathematical Synthesis." ISRN Biomathematics 2013 (May 28, 2013): 1–16. http://dx.doi.org/10.1155/2013/120974.

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The maintenance of blood glucose homeostasis is complex and involves several key tissues. Most of these tissues are not easily accessible, making direct measurement of the physiological parameters involved in glucose metabolism difficult. The use of isotope tracer methodology and mathematical modeling allows indirect estimates of in vivo glucose metabolism through relatively noninvasive means. The purpose of this paper was to provide a mathematical synthesis of the models developed for describing glucose kinetics. As many of the models were developed using dogs, example data from the canine li

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Ahac, Maja, and Stjepan Lakušić. "TRAM TRACK MAINTENANCE-PLANNING BY GAUGE DEGRADATION MODELLING." TRANSPORT 30, no. 4 (2015): 430–36. http://dx.doi.org/10.3846/16484142.2015.1116464.

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Tram track system management is a complex, costly and interdisciplinary process. It involves construction, monitoring and maintenance of track infrastructure and rolling stock, and public transport organization. Track management cost reduction requires development of a modern management system that is based on integration and mutual complementarity of engineering and maintenance activities. The first step of its establishment is increasing the proportion of planned predictive-preventive track maintenance at the expense of corrective maintenance. This requires creation of a maintenance-planning

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Kontrec, Nataša, Stefan Panić, Biljana Panić, Aleksandar Marković, and Dejan Stošović. "Mathematical Approach for System Repair Rate Analysis Used in Maintenance Decision Making." Axioms 10, no. 2 (2021): 96. http://dx.doi.org/10.3390/axioms10020096.

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Reliability, the number of spare parts and repair time have a great impact on system availability. In this paper, we observed a repairable system comprised of several components. The aim was to determine the repair rate by emphasizing its stochastic nature. A model for the statistical analysis of the component repair rate in function of the desired level of availability is presented. Furthermore, based on the presented model, the approach for the calculation of probability density functions of maximal and minimal repair times for a system comprised of observed components was developed as an im

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Sychenko, Viktor G., and Dmytro V. Mironov. "Development of a mathematical model of the generalized diagnostic indicato on the basis of full factorial experiment." Archives of Transport 43, no. 3 (2017): 125–33. http://dx.doi.org/10.5604/01.3001.0010.4230.

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Purpose. The aim of this work is to develop a mathematical model of the generalized diagnostic indicator of the technical state of traction substations electrical equipment. Methodology. The main tenets of the experiment planning theory, methods of structural-functional and multi-factor analysis, methods of mathematical and numerical modeling have been used to solve the set tasks. Results. To obtain the mathematical model of the generalized diagnostic indicator, a full factorial experiment for DC circuit breaker have been conducted. The plan of the experiment and factors affecting the change o

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Seda, Pavel, Milos Seda, and Jiri Hosek. "On Mathematical Modelling of Automated Coverage Optimization in Wireless 5G and beyond Deployments." Applied Sciences 10, no. 24 (2020): 8853. http://dx.doi.org/10.3390/app10248853.

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The need to optimize the deployment and maintenance costs for service delivery in wireless networks is an essential task for each service provider. The goal of this paper was to optimize the number of service centres (gNodeB) to cover selected customer locations based on the given requirements. This optimization need is especially emerging in emerging 5G and beyond cellular systems that are characterized by a large number of simultaneously connected devices, which is typically difficult to handle by the existing wireless systems. Currently, the network infrastructure planning tools used in the

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Gimaltdinov, Il'dus, Bulat Ziganshin, Ilgiz Galiev, Andrey Dmitriev, Al'bert Muhametshin, and Aleksandr Gricenko. "PREVENTIVE MAINTENANCE STRATEGY FOR CRUSHING EQUIPMENT." Vestnik of Kazan State Agrarian University 15, no. 3 (2020): 71–76. http://dx.doi.org/10.12737/2073-0462-2020-71-76.

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The research was carried out in order to develop a mathematical model and a diagnostic complex to determine the residual life of the rotor bearings of hammer crushers. Residual life information is essential for proactive maintenance and to prevent equipment crashes. To achieve this goal, Kazan State Agrarian University (Republic of Tatarstan) carried out calibration studies of the dependence of the diagnostic parameters of vibration on the value of the radial clearances of the bearings. 3610 bearings with different radial clearances (0.02 mm, 0.08 mm, 0.13 mm, 0.2 mm, 0.27 mm) were alternately

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Alhamad, Khaled, Rym M’Hallah, and Cormac Lucas. "A Mathematical Program for Scheduling Preventive Maintenance of Cogeneration Plants with Production." Mathematics 9, no. 14 (2021): 1705. http://dx.doi.org/10.3390/math9141705.

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This paper considers the scheduling of preventive maintenance for the boilers, turbines, and distillers of power plants that produce electricity and desalinated water. It models the problem as a mathematical program (MP) that maximizes the sum of the minimal ratios of production to the demand of electricity and water during a planning time horizon. This objective encourages the plants’ production and enhances the chances of meeting consumers’ needs. It reduces the chance of power cuts and water shortages that may be caused by emergency disruptions of equipment on the network. To assess its per

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Milković, Vili, Dragutin Lisjak, and Davor Kolar. "New reliability-based model of stock optimisation for railroad passenger wagon maintenance." FME Transactions 48, no. 4 (2020): 914–21. http://dx.doi.org/10.5937/fme2004914m.

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Today's railroad passenger wagons experience a large frequency of failures due to a large number of usage hours, and consequently planning maintenance is complex and expensive. Due to high maintenance costs, special attention should be given to the planning of part storage. This study develops a model which by using the data collected in the maintenance process, serves in optimising the costs of stock parts for a set level of reliability. The data on drive schedules and wagon repairs, mean time between failures and maintenance costs were collected over a year by a rail carrier for its entire r

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Stodola, Petr, and Jiří Stodola. "Model of Predictive Maintenance of Machines and Equipment." Applied Sciences 10, no. 1 (2019): 213. http://dx.doi.org/10.3390/app10010213.

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This paper presents selected possibilities for mathematical models in predictive maintenance of equipment. This model includes automatic classification of machines by labor intensity, determination of labor intensity standards, and drawing up monthly and yearly maintenance plans for manufacturing lines and technical equipment in an engineering company. This model reduces human error, clarifies accounting and operational records of machines, evaluates the actual maintenance labor intensity, eliminates routine administrative work, enables the use of cloud storages, and includes automatic reporti

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Old, Carl A., Ian J. Lean, and Heidi A. Rossow. "Mathematical absurdities in the California net energy system." Translational Animal Science 3, no. 3 (2019): 1018–28. http://dx.doi.org/10.1093/tas/txz020.

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Abstract Net energy systems, such as the California Net Energy System (CNES), are useful for prediction of input:output relationships not because of fidelity to the laws of thermodynamics, but because they were designed to predict well. Unless model descriptions of input:output relationships are consistent with the laws of thermodynamics, conclusions regarding those relationships may be incorrect. Heat energy (HE) + recovered energy (RE) = ME intake (MEI) is basic to descriptions of energy utilization found in the CNES and is consistent with the laws of thermodynamics; it may be the only relat

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Karima, Halim Qista, and Fauzan Romadlon. "Optimizing the Preventive Maintenance Scheduling Based on Dynamic Deterministic Demand in The Cement Manufacturing." Jurnal Ilmiah Teknik Industri 20, no. 1 (2021): 109–18. http://dx.doi.org/10.23917/jiti.v20i1.13894.

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Preventive maintenance is a planned and scheduled maintenance method that is carried out before a machine failure occurs. The maintenance schedule can be determined based on experience, historical data, or recommendations. Selecting the maintenance schedule greatly affects the production system. The Clin machine in cement manufacturing has an important role in the cement production process. During treatment, the client machine cannot produce clinker, so it is necessary to plan a production system to meet the demand. This paper aims to design an optimization model for determining the preventive

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Dulesov, Aleksander, Denis Karandeev, and Natalia Dulesova. "Improving the operation quality of technical systems using information theory models." MATEC Web of Conferences 224 (2018): 04006. http://dx.doi.org/10.1051/matecconf/201822404006.

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Improving the operation quality of the technical system performance while designing and operating is considered through the application of information theory models. The models are based on the mathematical description of the probabilistic state of system elements and the possibility of determining the information entropy. To implement the model, the role of the stochastic behavior of a technical object is emphasized. This role determines its probability state. The basis for the determining of the entropy of object state based on a series of scientific and conceptual positions, developments of

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Aboura, Khalid, Johnson I. Agbinya, and Ali Eskandarian. "Weibull Decision Support Systems in Maintenance." Organizacija 47, no. 2 (2014): 81–89. http://dx.doi.org/10.2478/orga-2014-0008.

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Abstract Background: The Weibull distribution is one of the most important lifetime distributions in applied statistics. Weibull analysis is the leading method in the world for fitting and analyzing lifetime data. We discuss one of the earliest decision support system for the assessment of a distribution for the parameters of the Weibull reliability model using expert information. We then present a different approach to assess the parameters distribution. Objectives: The studies mentioned in this paper aimed to construct a distribution of the parameters of the Weibull reliability model and app

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Muradian, L. A., I. V. Pitsenko, and V. Y. Shaposhnyk. "Mathematical Model of Risks in Railway Transport During Diagnostics of Axle Boxes of Freight Cars." Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, no. 1(91) (February 15, 2021): 94–103. http://dx.doi.org/10.15802/stp2021/230223.

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Purpose. The research is aimed at developing a mathematical model for determining the risks in railway transport during the diagnostics of axle boxes of freight cars, which will provide an assessment of traffic safety in the case of freight transportations. Methodology. To develop a mathematical model for determining the risks in railway transport, a continuous static model of the dependence of the level of individual approach of service personnel on the level of common interests (crew, shift) was used. Three types of dependencies were considered: optimistic, neutral, pessimistic. Findings. A

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Chen, Zhang, Liyuan Liu, Li Li, and Hui Li. "A Two-Stage Model for Project Optimization in Transportation Infrastructure Management System." Mathematical Problems in Engineering 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/914515.

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Mathematical optimization is very important for project decision in the Transportation Infrastructure Management System (TIMS). However, it has not been widely employed in TIMS due to poor performance of conventional optimization models in calculation speed and practical application. Therefore, it is necessary to improve the performance of optimization models. According to the process of decision-making in transportation management, a novel two-stage project optimization model, including budget allocation and project distribution, was proposed in this paper. Moreover, the methods of dynamic pr

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Adams, S. Keith, and Xianqiang Ma. "Predictive Models of Hand Torque Strength for Circular Electrical Connectors." Proceedings of the Human Factors Society Annual Meeting 33, no. 11 (1989): 737–41. http://dx.doi.org/10.1177/154193128903301124.

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Maintenance and its associated costs have become a serious problem for nearly all military and civilian organizations using aircraft and other complex hardware. This paper describes extensions of development work designed to provide basic elemental task configuration versus strength data for tightening and loosening circular electrical connectors by proposing a mathematical formulation of the problem, showing a model relating hand torque strength to specific task variables and dimensions, and giving the results of predictive tests in which predicted hand torque strength was compared against va

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Lee, Sangyum, Sungho Mun, and Hyungchul Moon. "Determination of Pavement Rehabilitation Activities through a Permutation Algorithm." Journal of Applied Mathematics 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/252808.

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This paper presents a mathematical programming model for optimal pavement rehabilitation planning. The model maximized the rehabilitation area through a newly developed permutation algorithm, based on the procedures outlined in the harmony search (HS) algorithm. Additionally, the proposed algorithm was based on an optimal solution method for the problem of multilocation rehabilitation activities on pavement structure, using empirical deterioration and rehabilitation effectiveness models, according to a limited maintenance budget. Thus, nonlinear pavement performance and rehabilitation activity

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Transeth, Aksel Andreas, Kristin Ytterstad Pettersen, and Pål Liljebäck. "A survey on snake robot modeling and locomotion." Robotica 27, no. 7 (2009): 999–1015. http://dx.doi.org/10.1017/s0263574709005414.

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SUMMARYSnake robots have the potential to make substantial contributions in areas such as rescue missions, firefighting, and maintenance where it may either be too narrow or too dangerous for personnel to operate. During the last 10–15 years, the published literature on snake robots has increased significantly. The purpose of this paper is to give a survey of the various mathematical models and motion patterns presented for snake robots. Both purely kinematic models and models including dynamics are investigated. Moreover, the different approaches to biologically inspired locomotion and artifi

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Layan, Maylis, Simon Dellicour, Guy Baele, Simon Cauchemez, and Hervé Bourhy. "Mathematical modelling and phylodynamics for the study of dog rabies dynamics and control: A scoping review." PLOS Neglected Tropical Diseases 15, no. 5 (2021): e0009449. http://dx.doi.org/10.1371/journal.pntd.0009449.

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Background Rabies is a fatal yet vaccine-preventable disease. In the last two decades, domestic dog populations have been shown to constitute the predominant reservoir of rabies in developing countries, causing 99% of human rabies cases. Despite substantial control efforts, dog rabies is still widely endemic and is spreading across previously rabies-free areas. Developing a detailed understanding of dog rabies dynamics and the impact of vaccination is essential to optimize existing control strategies and developing new ones. In this scoping review, we aimed at disentangling the respective cont

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Niyamosoth, Thanawath, and Supachai Pathumnakul. "Joint determination of preventive maintenance and buffer stock for a production unit under lease." Journal of Industrial Engineering and Management 11, no. 3 (2018): 497. http://dx.doi.org/10.3926/jiem.2578.

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Purpose: The purpose of this work is to develop a mathematical model for simultaneously determining the optimal period of preventive maintenance actions and the optimal size of buffer stock for a production unit that is owned by a lessor and leased to a lessee under a lease contract.Design/methodology/approach: A mathematical model is formulated and a numerical procedure is developed for finding the optimal period of preventive maintenance actions and the optimal size of buffer stock to minimize the total expected costs considering both a lessor and a lessee over a lease period.Findings: The p

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Goncharenko, Andriy. "AIRCRAFT OPERATION DEPENDING UPON THE UNCERTAINTY OF MAINTENANCE ALTERNATIVES." Aviation 21, no. 4 (2017): 126–31. http://dx.doi.org/10.3846/16487788.2017.1415227.

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The paper considers the theoretical explanation and construction of some mathematical models of the aircraft operational process in reference to maintenance organizations preferred by aviation experts and aircraft operators. The uncertainty of such operational multi-alternativeness is evaluated on the basis of subjective entropy of preferences demonstrated by aircraft operators and aviation experts. When applying the maximum principle of subjective entropy, the optimal distributions of the preferences are obtained. The proposed concept allows finding the optimal distribution of the aircraft fl

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Lienkov, S. V., I. V. Tolok, G. V. Banzak, R. Yu Koltsov, E. S. Lenkov, and S. V. Dobrovolskaya. "JUSTIFICATION OPTIMAL PARAMETERS OF REGULATED MAINTENANCE STRATEGY." Collection of scientific works of the Military Institute of Kyiv National Taras Shevchenko University, no. 69 (2020): 13–22. http://dx.doi.org/10.17721/2519-481x/2020/69-02.

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A characteristic feature of complex technical objects for special purposes is the presence in their composition of a large number (tens, hundreds of thousands) of different types component parts that have different levels of reliability, different patterns of their wear and tear processes. This feature requires a more subtle approach to the organization and planning maintenance in the course of their operation. The problem is that in the development of such facilities, all issues related to maintainability and maintenance should be addressed already at the early stages of facility design. If y

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Ozturkoglu, Yucel, and Omer Ozturkoglu. "Propose a Polynomial Time Algorithm for Total Completion Time Objective." International Journal of Mathematical, Engineering and Management Sciences 6, no. 3 (2021): 932–43. http://dx.doi.org/10.33889/ijmems.2021.6.3.055.

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In this study, we integrate deteriorate jobs with repair&maintenance activity on a single machine scheduling subject to total completion time. This work has more than one motivation. First, jobs are assigned to machines in an automated production line. Later, to schedule the maintenance activities, if needed, to prevent machinery from breaking down later. There are some important mathematical models to solve this combination. However, due to the complexity of the problem which is Np-hard, a polynomial algorithm should be needed for solving large problems. Therefore, this article introduces

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Omar, Noor S., Wadhah A. Hatem, and Hafeth I. Najy. "Predictive Modeling for Developing Maintenance Management in Construction Projects." Civil Engineering Journal 5, no. 4 (2019): 892–900. http://dx.doi.org/10.28991/cej-2019-03091297.

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Maintenance is one of the most important global issue and it taking an increasing recognition in numerous study field. Meanwhile, in Iraq with the absence of an efficient building maintenance management and a lack of appropriate predictive maintenance tool of the current buildings can have a significant negative impact on future building development. Currently, there is a paradigm shift in management of building maintenance from corrective to preventive and predictive approaches that is attainable through creating of an evaluative model to evaluate a variety of alternative decisions. This pape

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RAHMAN, ANISUR, and GOPINATH CHATTOPADHYAY. "REVIEW OF LONG-TERM WARRANTY POLICIES." Asia-Pacific Journal of Operational Research 23, no. 04 (2006): 453–72. http://dx.doi.org/10.1142/s021759590600108x.

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A large number of products are now being sold with long-term warranty policies. This is mainly due to fierce competition in the market and customer demand. Offering long-term warranty results in additional complexities in estimating costs associated with warranty servicing due to the uncertainties associated with usage, preventive maintenance and warranty servicing strategies. This paper reviews various long-term warranty policies and mathematical models for estimation of warranty servicing costs.

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Arena, Simone, Irene Roda, and Ferdinando Chiacchio. "Integrating Modelling of Maintenance Policies within a Stochastic Hybrid Automaton Framework of Dynamic Reliability." Applied Sciences 11, no. 5 (2021): 2300. http://dx.doi.org/10.3390/app11052300.

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The dependability assessment is a crucial activity for determining the availability, safety and maintainability of a system and establishing the best mitigation measures to prevent serious flaws and process interruptions. One of the most promising methodologies for the analysis of complex systems is Dynamic Reliability (also known as DPRA) with models that define explicitly the interactions between components and variables. Among the mathematical techniques of DPRA, Stochastic Hybrid Automaton (SHA) has been used to model systems characterized by continuous and discrete variables. Recently, a

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