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Journal articles on the topic 'Maintenance; Structural repair'
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1
Comisu, Cristian-Claudiu, and Gheorghita Boaca. "Structural identification of bridges: Monitoring, Maintenance and Repair." IABSE Symposium Report 97, no. 24 (January 1, 2010): 46–51. http://dx.doi.org/10.2749/222137810796025032.
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Pan, Nai-Hsin, and Kuei-Yen Chen. "Facility Maintenance Traceability Information Coding in BIM-Based Facility Repair Platform." Advances in Civil Engineering 2020 (August 8, 2020): 1–12. http://dx.doi.org/10.1155/2020/3426563.
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The importance of facility management (FM) has gradually been recognized in the life cycle of a building. Both new and existing buildings require a more efficient approach and advanced technology to improve the efficiency of the FM. The study is aimed to enhance the facility repair process. Thus, the study presents a building information modeling (BIM)-based facility repair platform framework, which enables expedited reporting for repairs and a comprehensive listing of the status, location, and maintenance record facilities. To effectively facilitate the FM information transfer among stakeholders, firstly, the study presents a facility traceability coding structure for building facilities, the proposed platform framework. The proposed facility traceability information coding in QR code format can help general users and FM personnel identify and locate the specific or abnormal facility quickly. Secondly, the study demonstrates that how to apply the proposed code in QR code format in the BIM-based facility repair platform with a case test. The research findings showed that the proposed method enables FM personnel to significantly improve the efficiency of FM, which can help FM personnel make preliminary facility repair judgments and schedule maintenance plan to track the status of the facility repair which can help improve the efficiency of facility management and simplify the repair process.
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Hammett, Michael. "The repair and maintenance of brickwork." Structural Survey 9, no. 2 (February 1991): 153–60. http://dx.doi.org/10.1108/eum0000000003248.
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Litina, Chrysoula, and Abir Al-Tabbaa. "Development of sustainable concrete repair materials via microencapsulated agents." MATEC Web of Conferences 289 (2019): 11002. http://dx.doi.org/10.1051/matecconf/201928911002.
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Identification of non-structural damage in concrete infrastructure and actuation of preventive repair solutions is an established approach to avoid further structural damages and more expensive repair regimes. However the repair of concrete itself is not infallible with 55% of reported repairs in the EU failing within 5 years of service. Thus the already once repaired concrete structure is then subject to a constant cycle of repeated repair and a cumulative associated life cycle cost. The development of external repair material with self-healing capabilities, can affect a real step-change on the life-cycle costs and maintenance of existing and new infrastructure. Developed polymeric microcapsules containing liquid sodium silicate were used to impart autonomic self-healing to readily available commercial repair mortars for the first time. These materials cover a range of potential real time repair applications. Initially the compatibility between the developed self-healing agents and commercial products was established and the self-healing performance of the novel composite system was then evaluated. The results underlined the huge potential for the proposed composite systems as a stepping stone toward commercial uptake of self-healing microcapsule-based cementititious materials.
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Umeda, Yasushi, Tetsuo Tomiyama, and Hiroyuki Yoshikawa. "A Design Methodology for Self-Maintenance Machines." Journal of Mechanical Design 117, no. 3 (September 1, 1995): 355–62. http://dx.doi.org/10.1115/1.2826688.
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This paper proposes a design methodology for self-maintenance machines. The self-maintenance machine is a machine that can maintain its functions for a while, even though faults happen. In order to achieve capabilities for diagnosing and repair planning, a model based approach that employs qualitative physics is proposed. Regarding repair execution, two types of repair strategies are proposed; viz., control type and functional redundancy type which is a strategy to add redundancy to a machine from a viewpoint of function. A prototype of the self-maintenance machine is developed. Because this machine uses the control type of repair strategy, it succeeded to maintain its functions as far as its structure does not change. A promising candidate for dealing with faults that involve structural changes is the functional redundancy type of repair.
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Boyles, Stephen D., Zhanmin Zhang, and S. Travis Waller. "Optimal Maintenance and Repair Policies under Nonlinear Preferences." Journal of Infrastructure Systems 16, no. 1 (March 2010): 11–20. http://dx.doi.org/10.1061/(asce)1076-0342(2010)16:1(11).
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Avent, R. Richard, and Bruce L. Brakke. "Anatomy of Steel Bridge Heat-Straightening Project." Transportation Research Record: Journal of the Transportation Research Board 1561, no. 1 (January 1996): 26–36. http://dx.doi.org/10.1177/0361198196156100104.
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Heat-straightening repair of damaged steel girders has been conducted on a number of bridges over the years. However, little documentation is available on repair methodology and response to such repairs. Such documentation for the field repair of a bridge in Iowa is provided. The Iowa Department of Transportation (IDOT) decided to train its maintenance personnel to perform heat-straightening repairs. The training program consisted of 2 days of classroom and laboratory tutorial training and a field heat-straightening project. The field project was a bridge spanning I-80 near Davenport. The repair was successfully completed and demonstrated the practicality of implementing recent advances in heat-straightening research. The response of the damaged girder to the heat-straightening process was also measured and compared with theoretical models.
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Al-Refaie, Abbas, Heba Al-Shalaldeh, and Natalija Lepkova. "PROPOSED PROCEDURE FOR OPTIMAL MAINTENANCE SCHEDULING UNDER EMERGENT FAILURES." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 26, no. 4 (April 21, 2020): 396–409. http://dx.doi.org/10.3846/jcem.2020.12315.
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Production lines are usually subjected to emergent machine failures. Such emergent failures disrupt pre-established maintenance schedules, which challenge maintenance engineers to react to those failures in real time. This research proposes an optimization procedure for optimizing scheduling repairs of emergent failures. Three optimization models are developed. Model I schedules failures in newly idle repair shops with the objective of maximizing the number of scheduled repairs. Model II maximizes the number of assigned repairs to untapped ranges. Model III maximizes both the number of assigned failure repairs and satisfaction on regular and emergency repairs by resequencing regular and emergent failures in the shop that contains the largest free margin. A real case study is provided to illustrate the proposed optimization procedure. Results reveal that the proposed models efficiently scheduled and sequenced emergent failures in the idle maintenance shops, the untapped ranges between repairs of regular failures, and in the maintenance shop with the largest free margin. In conclusions, the proposed models can greatly support maintenance engineers in planning repairs under unexpected failures.
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Ayling, James, Adam Bowler, Gregory Brick, and Mladen Ignjatovic. "Practical Application of Structural Repair Fatigue Life Determination on the AP-3C Orion Platform." Advanced Materials Research 891-892 (March 2014): 1065–70. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1065.
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The AP-3C Orion aircraft is the oldest aircraft in the Royal Australian Air Force (RAAF) inventory. The planned fleet withdrawal has been extended far beyond the original design service objective. Continued safe and effective operation has required the development of a robust ageing aircraft management approach. A fundamental aspect was supplementing the structural certification basis with appropriate standards in the form of fatigue management requirements from Federal Aviation Regulations (FAR) 25.571 and Federal Aviation Administration Advisory Circular (FAA AC) 120-93. To develop and underpin the ageing aircraft management plan and transition to the supplementary fatigue management standards, the RAAF collaborated with the Original Equipment Manufacturer, Lockheed Martin Aeronautics Company, the United States Navy (USN) and other operators to form the P-3C Service Life Assessment Program (SLAP). This program provided Full Scale Fatigue Test (FSFT) data, associated analyses and analysis tools to support management in accordance with FAR 25.571. An important element of the ageing aircraft management plan included the introduction of a rigorous Safety By Inspection (SBI) maintenance regime to assure structural airworthiness. FAA AC 120-93 requires assessment of structural repairs to determine revised fatigue management and inspection requirements. Often, this information is derived using tailored analysis tools and detailed models on a case-by-case basis. This approach is specialized, expensive and usually occurs after the repair has been designed and installed. To avoid these limitations, the AP-3C Repair Assessment Manual (RAM) was developed to provide the repair designer with a design handbook approach to fatigue analysis. In conjunction with some simple Finite Element (FE) models, the RAM supports complete repair analysis prior to an aircraft leaving the maintenance venue. This paper will present the history of the SBI program, the genesis of the RAM and actual examples of assessing structural repairs on the P-3 platform using the RAM.
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Carr, Bruce A., Thomas M. Houlihan, and Michael A. Polini. "CAD/CAM in Phased Maintenance." Journal of Ship Production 7, no. 04 (November 1, 1991): 234–47. http://dx.doi.org/10.5957/jsp.1991.7.4.234.
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The authors' company is a medium-sized engineering company specializing in naval ship repair. The bulk of corporate work centers on the Phased Maintenance (PM) of three classes of ships. Typically, each PM contract covers three to five different ships per class scheduled for 90-day Availabilities at approximately one-year intervals over a period of five years. The type of work to be performed during each Phased Maintenance Availability (PMA) falls into one of two categories: ship alterations or ship repairs. The first group, ship alterations, is characterized by detailed, long-lead engineering and planning efforts, typically beginning 540 days prior to the vessels's arrival. The second group, ship repairs, makes up the other end of the spectrum with short lead times and compressed service details. The majority of repair items are identified 60 days prior to an Availability, while some are not determined until after the vessel has arrived in the shipyard. The engineering department that services PMA work is composed of three disciplines: structural, mechanical and electrical. The mechanical discipline is further subdivided into the areas of machinery and piping/HVAC. While the nature of PMA work within each discipline is peculiar to the application, the process is similar in each. Reference information is gathered and verified, technical analysis is provided where necessary, and detailed drawings are prepared and submitted for Navy approval prior to shipyard production. All drawings are developed using two-dimensional drafting techniques at various sites by teams of computer-aided design (CAD) input operators utilizing color graphic workstations on a multi-shift basis as required by the workload. Completed drawings are transferred to the engineering site over a network link, where additional workstations are available for engineers to check and correct them as necessary
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Kayan, Brit Anak, Alan M. Forster, and Phillip F. G. Banfill. "Green Maintenance for historic masonry buildings: an option appraisal approach." Smart and Sustainable Built Environment 5, no. 2 (July 4, 2016): 143–64. http://dx.doi.org/10.1108/sasbe-05-2015-0010.
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Purpose – Sustainability is well understood to encapsulate economic, environmental and societal parameters. The efficiency of maintenance interventions for historic buildings is no exception and also conforms to these broad factors. Recently, environmental considerations for masonry repair have become increasingly important and this work supports this growing area. The purpose of this paper is to give insight on how an option appraisal approach of “Green Maintenance” modelling for historic masonry buildings repair practically determine and ultimately substantiate the decision-making process using a calculation procedures of life cycle assessment, within delineated boundaries. Design/methodology/approach – Calculation procedures of the model enables an assessment of embodied carbon that is expended from different stone masonry wall repair techniques and scenarios for historic masonry buildings during the maintenance phase. Findings – It recognises the importance roles Green Maintenance model can play in reducing carbon emissions and underpins rational decision making for repair selection. Practical implications – It must be emphasised that the calculation procedures presented here, is not confined to historic masonry buildings and can be applied to any repair types and building form. The decisions made as a result of the utilisation of this model practically support environmentally focused conservation decisions. Social implications – The implementation of the model highlights the efficacy of repairs that may be adopted. Originality/value – The paper is a rigorous application and testing of the Green Maintenance model. The model relays the “true” carbon cost of repairs contextualised within the longevity of the materials and its embodied carbon that consequently allows rational appraisal of repair and maintenance options.
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Anisya, Anisya, and Fajar Nugroho. "Design of Structural Damage Identification Applications Web-Based." MATEC Web of Conferences 215 (2018): 01032. http://dx.doi.org/10.1051/matecconf/201821501032.
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The current building construction and maintenance Note well, certainly will be utilized as desired. If a building is experiencing interference, then all activities will be obstructed so that the building requires maintenance activities. Building maintenance activities include the maintenance of the structure, architectural, mechanical, electrical, and outer space. On systems that are running now the surveyor directly monitor to location which requires a fee and take a long time. Technology websites that are built can be used for building maintenance activities in the form of a data string entered by the Manager of the building and the response of the Contracting Party. With this technology produces a system that can help in the process of monitoring a building that suffered damage and need repair.
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Jain, Nikunj Kumar, Alok Kumar Singh, and Kapil Kaushik. "Evaluating service quality in automobile maintenance and repair industry." Asia Pacific Journal of Marketing and Logistics 32, no. 1 (June 26, 2019): 117–34. http://dx.doi.org/10.1108/apjml-07-2018-0277.
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Purpose The purpose of this paper is to analyse service quality in the automobile maintenance and repair industry. A conceptual structural model is developed to investigate the impact of service quality, perceived service fairness and convenience on customer service satisfaction. The impact of service satisfaction and brand trust on word of mouth (WOM) is also explored, and the study assesses the mediating effect of customer service satisfaction on the relationship between service quality and WOM. Design/methodology/approach Data from a questionnaire-based survey of 259 users of automobile maintenance and repair centres were analysed using covariance-based structural equation modelling. Findings The findings indicate that service quality dimensions (reliability, responsiveness and empathy), perceived service fairness and convenience are positively associated with customer service satisfaction, and that service satisfaction and trust positively influence WOM. The findings support the mediating effect of service satisfaction on the relationship between reliability and responsiveness and WOM. Research limitations/implications The study’s main limitation is the cross-sectional design, which limits the generalisability of the findings. Practical implications To ensure customer satisfaction and generate trust and WOM, automobile maintenance and repair service centres should improve reliability, responsiveness and empathy, as well as perceived service fairness and convenience. Originality/value The study demonstrates that the reliability and responsiveness dimensions of service quality are the most significant predictors of customer service satisfaction in the automobile maintenance and repair industry.
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Kim, Jimyong, Sangguk Yum, Seunghyun Son, Kiyoung Son, and Junseo Bae. "Modeling Deep Neural Networks to Learn Maintenance and Repair Costs of Educational Facilities." Buildings 11, no. 4 (April 15, 2021): 165. http://dx.doi.org/10.3390/buildings11040165.
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Educational facilities hold a higher degree of uncertainty in predicting maintenance and repair costs than other types of facilities. Moreover, achieving accurate and reliable maintenance and repair costs is essential, yet very little is known about a holistic approach to learning them by incorporating multi-contextual factors that affect maintenance and repair costs. This study fills this knowledge gap by modeling and validating deep neural networks to efficiently and accurately learn maintenance and repair costs, drawing on 1213 high-confidence data points. The developed model learns and generalizes claim payout records on the maintenance and repair costs from sets of facility asset information, geographic profiles, natural hazard records, and other causes of financial losses. The robustness of the developed model was tested and validated by measuring the root mean square error and mean absolute error values. This study attempted to propose an analytical modeling framework that can accurately learn various factors, significantly affecting the maintenance and repair costs of educational facilities. The proposed approach can contribute to the existing body of knowledge, serving as a reference for the facilities management of other functional types of facilities.
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Sobrino, Juan A. "An Introduction: Operations, Maintenance and Repair of Structures." Structural Engineering International 17, no. 4 (November 2007): 328. http://dx.doi.org/10.2749/101686607782359191.
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Nooririnah, O., A. Y. Khalil, M. S. Aludin, A. Rohana, and R. R. Zuraidah. "Overview Potential Applications of Cold Spray Process for Aviation Industry in Malaysia." Advanced Materials Research 701 (May 2013): 375–77. http://dx.doi.org/10.4028/www.scientific.net/amr.701.375.
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Malaysia plans to become a regional hub for aircraft maintenance and repairs. The country was currently ranked fifth in Asia and tenth in the world in terms of aircraft maintenance, repair and overhaul.It show a positive sign for aviation industry in Malaysia.Maintenance or repair technique play a major role in increasing useful life of the aerospace part and it increase the confident level of the user. This paper is an outcome to discuss Cold spray process as potential repair technique which is widely acclaimed for its ability to perfom a bonding with the underlying material without the creation of heat affected zones which are typical of other deposition processes (thermal spray) and are undesirable in many structural applications. One of potential application for Cold spray process is dimensional restoration or tooling repair like chipped area, if the defect exceed repairable limit that provided by OEM, that part considered scrap. Cold spray can provided environmental friendly solution to thick deposit for dimensional restoration or tooling repair without creation heat affected zone.There is no application yet of this repair technology in Malaysia and on top of that,re-use of material will contribute to cost saving and in-haze the environmet.
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Kayan, Brit Anak. "Conservation plan and “green maintenance” from sustainable repair perspectives." Smart and Sustainable Built Environment 4, no. 1 (May 18, 2015): 25–44. http://dx.doi.org/10.1108/sasbe-08-2014-0042.
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Purpose – It is well recognised that Conservation Plan has attracted attention to the maintenance of historic buildings; despite diverse array of issues, particularly associated with “Green Maintenance” concept and methodology and sustainable repair approach. The theory of these three concepts currently exists, but fails to be realised in practical integration. The purpose of this paper to ask why this failure is occurring and how it influences sustainable historic environment. Design/methodology/approach – The paper is composed of a critical review of existing literature and an argument built based on the concept of a Conservation Plan, “Green Maintenance” concept and methodology and sustainable repair approach for historic buildings. Findings – Despite the need of maintenance of historic buildings, this review suggests that a Conservation Plan often mitigates against its own association with “Green Maintenance”. Conversely, this could be improved by transforming the integration to be more pronounced in achieving sustainable repair for historic buildings. Practical implications – An integration of the concept of a Conservation Plan, “Green Maintenance” and sustainable repair approach could be utilised to form the basis of decision-making process for achieving sustainable historic environment. Social implications – An integration of Conservation Plan, “Green Maintenance” and sustainable repair approach will be positively welcomed as our society moves towards a low carbon economy and materials as well as “green” procurement. Originality/value – Unless integration between of a Conservation Plan, “Green Maintenance” and sustainable repair is improved, much of our culturally significant historic buildings will not be repaired in sustainable ways and our future generation may lose their historic environment.
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Dutta, Utpal, and T. H. Maze. "Model for Comparing Performance of Various Transit Maintenance Repair Policies." Journal of Transportation Engineering 115, no. 4 (December 1989): 450–56. http://dx.doi.org/10.1061/(asce)0733-947x(1989)115:4(450).
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Prastowo, Ichwan. "REVIEW OF BUILDING MAINTENANCE AND MAINTENANCE MANAGEMENT SYSTEM AT THE SUNAN HOTEL SOLO." astonjadro 9, no. 2 (November 21, 2020): 145. http://dx.doi.org/10.32832/astonjadro.v9i2.3389.
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<p>The purpose of this study is to find out how the building repair and maintenance management system of the building on the hotel and to know how the repairment and maintenance of the building on the hotel, and to review the condition of the existing damage of structural components, architecture, mechanical and electrical, exterior space and housekeeping categorized in heavy, medium and light damage. This study's methodology is qualitative and quantitative scripted research with observation methods, bibliography, qualitative, and documentation. The population and samples used are all Engineering Department employees because there are only fewer than 100 people. The results of the review of the data obtained are data on the Engineering Department's Organization Structure, Employee Job Description, and Workflow. In the implementation of repair and maintenance, 76% of employees already carried out, the largest massive damage review for the field of housekeeping is polishing granite marble 39.23 %. For the largest moderate damage is on the outer space field 30.85 %, then the largest minor damage is in the field of architecture of 58.71 %. These results serve as a guide in the planning of the annual work program.</p>
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MISHINA, ZOYA. "ORGANIZATIONAL AND TECHNOLOGICAL PRINCIPLES FOR CREATION INNOVATION CENTERS." Tekhnicheskiy servis mashin 4, no. 141 (December 2020): 40–46. http://dx.doi.org/10.22314/2618-8287-2020-58-1-40-46.
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Timely conducting of all types of maintenance and routine repairs is possible only in the conditions of an innovative service center, equipped with the necessary equipment and having a complex of facilities to ensure favorable conditions for technical service. (Research purpose) The research purpose is in identifying opportunities for updating the technical service system in the agro-industrial complex by creating innovative service centers to ensure highly efficient operation of agricultural machinery and equipment. (Materials and methods) The system of maintenance in agriculture is characterized by a significant decrease in efficiency due to physical and moral wear of equipment of repair and technical enterprises, low level and insufficient qualification of personnel and managers of enterprises of the agro-industrial complex. The availability of existing enterprises of the agro-industrial complex with production areas is no more than 50 percent, technological equipment is no more than 47 percent, and technological equipment and equipment for jobs are 15 and 40 percent. (Results and discussion) The modernization of the infrastructure of technical service of agricultural machinery is aimed at updating the technological base of machine repair. Repair and technical enterprises do not have the necessary equipment to perform a number of maintenance and routine repairs. The process of developing technical service infrastructure is significantly behind the level of structural and technological complexity of agricultural machinery. Due to technological requirements, complex components and assemblies, such as engines, hydraulic equipment, fuel pumps of domestic and imported agricultural machinery should not be repaired in the conditions of farms. (Conclusions) The high technological level of innovative technical service centers serves as a condition for efficient operation of production, ensuring its stability and reliability of operation, flexibility and adaptability, high intensity and waste-free operation.
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Mbantenkhu, MacMillan, Sara Wierzbicki, Xiaowen Wang, Shangdong Guo, Stephan Wilkens, and Xin Jie Chen. "A short carboxyl-terminal tail is required for single-stranded DNA binding, higher-order structural organization, and stability of the mitochondrial single-stranded annealing protein Mgm101." Molecular Biology of the Cell 24, no. 10 (May 15, 2013): 1507–18. http://dx.doi.org/10.1091/mbc.e13-01-0006.
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Mgm101 is a Rad52-type single-stranded annealing protein (SSAP) required for mitochondrial DNA (mtDNA) repair and maintenance. Structurally, Mgm101 forms large oligomeric rings. Here we determine the function(s) of a 32–amino acid carboxyl-terminal tail (Mgm101238–269) conserved in the Mgm101 family of proteins. Mutagenic analysis shows that Lys-253, Trp-257, Arg-259, and Tyr-268 are essential for mtDNA maintenance. Mutations in Lys-251, Arg-252, Lys-260, and Tyr-266 affect mtDNA stability at 37°C and under oxidative stress. The Y268A mutation severely affects single-stranded DNA (ssDNA) binding without altering the ring structure. Mutations in the Lys-251–Arg-252–Lys-253 positive triad also affect ssDNA binding. Moreover, the C-tail alone is sufficient to mediate ssDNA binding. Finally, we find that the W257A and R259A mutations dramatically affect the conformation and oligomeric state of Mgm101. These structural alterations correlate with protein degradation in vivo. The data thus indicate that the C-tail of Mgm101, likely displayed on the ring surface, is required for ssDNA binding, higher-order structural organization, and protein stability. We speculate that an initial electrostatic and base-stacking interaction with ssDNA could remodel ring organization. This may facilitate the formation of nucleoprotein filaments competent for mtDNA repair. These findings could have broad implications for understanding how SSAPs promote DNA repair and genome maintenance.
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McGugan, M., G. Pereira, B. F. Sørensen, H. Toftegaard, and K. Branner. "Damage tolerance and structural monitoring for wind turbine blades." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2035 (February 28, 2015): 20140077. http://dx.doi.org/10.1098/rsta.2014.0077.
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The paper proposes a methodology for reliable design and maintenance of wind turbine rotor blades using a condition monitoring approach and a damage tolerance index coupling the material and structure. By improving the understanding of material properties that control damage propagation it will be possible to combine damage tolerant structural design, monitoring systems, inspection techniques and modelling to manage the life cycle of the structures. This will allow an efficient operation of the wind turbine in terms of load alleviation, limited maintenance and repair leading to a more effective exploitation of offshore wind.
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Zhang, X. Q., P. W. M. Tam, and W. Zheng. "Construction, operation, and maintenance of rubber dams." Canadian Journal of Civil Engineering 29, no. 3 (June 1, 2002): 409–20. http://dx.doi.org/10.1139/l02-016.
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Rubber dams are inflatable and deflatable hydraulic structures. Thousands of rubber dams have been installed worldwide for various purposes: irrigation, water supply, power generation, tidal barrier, flood control, environmental improvement, and recreation. Furthermore, rubber dams have been used in cold areas where the temperature is as low as 40°C. The simplicity and flexibility of the rubber dam structure and its proven reliability are key considerations in its wide scope of applications. Based on the management practices of 20 rubber dams in Hong Kong in the past 35 years, interviews with rubber dam experts and practitioners, and the investigation to the construction of a recent rubber dam, this paper provides a detailed discussion on various issues related to the construction, operation, maintenance, and repair of rubber dams.Key words: construction, hydraulic structure, maintenance, operation, repair, rubber dam.
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Fan, Hongqin, Hyoungkwan Kim, and Osmar R. Zaïane. "Data warehousing for construction equipment management." Canadian Journal of Civil Engineering 33, no. 12 (December 1, 2006): 1480–89. http://dx.doi.org/10.1139/l06-108.
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Equipment logistics, maintenance, and repair are important aspects of construction equipment management. A well-managed equipment fleet helps reduce downtime, as well as total maintenance and repair costs. With quickly growing fleets of equipment, large contractors tend to divert the maintenance and repair of equipment from equipment managers to project managers. As a result, the equipment managers shift their attention from operational-level decision-making to corporate-level strategic decision-making regarding equipment management, which is often a challenging job with the current equipment management system. This paper presents an equipment data warehouse and a prototype decision support system (DSS). The proposed equipment data warehouse enables equipment managers to visually analyze the equipment fleet data from different perspectives and at various level of details. The data-warehouse-based DSS facilitates high-level, fact-based decision-making regarding equipment logistics, supplies, maintenance, repair, and replacement and has higher levels of performance and flexibility than the current equipment management system.Key words: data warehouse, decision support system, equipment management, multidimensional modeling.
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Wang, Yiwei, Christian Gogu, Nicolas Binaud, Christian Bes, Raphael T. Haftka, and Nam-Ho Kim. "Predictive airframe maintenance strategies using model-based prognostics." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 232, no. 6 (March 1, 2018): 690–709. http://dx.doi.org/10.1177/1748006x18757084.
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Aircraft panel maintenance is typically based on scheduled inspections during which the panel damage size is compared to a repair threshold value, set to ensure a desirable reliability for the entire fleet. This policy is very conservative since it does not consider that damage size evolution can be very different on different panels, due to material variability and other factors. With the progress of sensor technology, data acquisition and storage techniques, and data processing algorithms, structural health monitoring systems are increasingly being considered by the aviation industry. Aiming at reducing the conservativeness of the current maintenance approaches, and, thus, at reducing the maintenance cost, we employ a model-based prognostics method developed in a previous work to predict the future damage growth of each aircraft panel. This allows deciding whether a given panel should be repaired considering the prediction of the future evolution of its damage, rather than its current health state. Two predictive maintenance strategies based on the developed prognostic model are proposed in this work and applied to fatigue damage propagation in fuselage panels. The parameters of the damage growth model are assumed to be unknown and the information on damage evolution is provided by noisy structural health monitoring measurements. We propose a numerical case study where the maintenance process of an entire fleet of aircraft is simulated, considering the variability of damage model parameters among the panel population as well as the uncertainty of pressure differential during the damage propagation process. The proposed predictive maintenance strategies are compared to other maintenance strategies using a cost model. The results show that the proposed predictive maintenance strategies significantly reduce the unnecessary repair interventions, and, thus, they lead to major cost savings.
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Lechtreck, Karl F., Ilaria Mengoni, Batare Okivie, and Kiersten B. Hilderhoff. "In vivo analyses of radial spoke transport, assembly, repair and maintenance." Cytoskeleton 75, no. 8 (August 2018): 352–62. http://dx.doi.org/10.1002/cm.21457.
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Dai, Jing Tao, Pei Zhong Zhao, Hong Bo Su, Hao Dong Liu, Yu Bo Wang, and Shi Kang Dong. "Optimal Design of Composite Material Maintenance Structure for Aircraft Based on ANSYS Workbench." Key Engineering Materials 871 (January 2021): 216–21. http://dx.doi.org/10.4028/www.scientific.net/kem.871.216.
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Composite material is widely used to maintain damaged structures of aircraft. The 3D finite element model of composite cement maintenance for aircraft is established by finite element method software ANSYS Workbench. The structural characteristics and usage status of the composite cement maintenance model is analyzed, and then the optimal structural parameters of the composite patch are obtained, including the length, width and thickness. The results show that the composite cement maintenance method could effectively restore the rigidity, and improve the strength of the structure. Furthermore, the optimal design for composite patch ensures safety of aircraft, economics of maintenance, and operability of repair methods.
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Molent, Lorrie. "Managing Fatigue from Corrosion Pits in Aircraft Structures." Advanced Materials Research 891-892 (March 2014): 261–66. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.261.
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Despite corrosion prevention or protection schemes/treatments and corrosion prevention and control plans, in-service corrosion does occur and has the potential to impact the structural integrity of aircraft. Whilst the fatigue management of the aircraft is generally well understood as reflected in typical Aircraft Structural Integrity Management Plans (ASIMP), which in some cases contain environmental degradation plans, limited provision beyond find and fix exists for corrosion repair. Thus the repair of corrosion can be a major through life cost driver as well as an aircraft availability degrader. This find and fix policy exists largely because tools are currently considered too immature to accurately assess the structural significance of corrosion when it is detected. In this paper a process is described which should allow an alternative to the current find (corrosion) and fix philosophy for pitting corrosion. The method is intended to maintain a probability of failure consistent with ASIMP structural certification requirements for fatigue cracks initiating from corrosion pits for a specific period. Unanticipated maintenance costs significantly more than planned maintenance. Thus delaying the repair of pitting corrosion until the next scheduled maintenance, should save considerable resources and improve aircraft availability. The development of analytical tools capable of accurately assessing the effect of corrosion on the durability of a structure would be considered a major advance for the ASIMP.
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Sun, Jianzhong, Dan Chen, Chaoyi Li, and Hongsheng Yan. "Integration of scheduled structural health monitoring with airline maintenance program based on risk analysis." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 232, no. 1 (November 24, 2017): 92–104. http://dx.doi.org/10.1177/1748006x17742777.
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The aerospace industry is striving to reduce the aircraft operating costs while maintaining required safety level. Emerging technologies such as the structural health monitoring to reduce long-term maintenance cost and increase aircraft availability are promoted by the manufacturers. To successfully integrate the structural health monitoring technology into the current maintenance process of modern commercial aviation, a clear definition of the structural-health-monitoring-based maintenance operational concept and the system level requirements is required. This article proposed a structural health monitoring operational concept and the associated maintenance cost modeling and risk assessment methods for the implementation of the structural health monitoring in commercial aviation industry. The developed methodology provides a tool to determine the optimal scheduled structural health monitoring inspection interval and repair decision thresholds for approved scheduled structural health monitoring task. A simulated case study is carried out to demonstrate the structural health monitoring operational concept and how an optimal maintenance strategy can be determined using the proposed methodology. Preliminary results show that the integration of the structural health monitoring into the existing maintenance process can reduce the maintenance cost compared to that of the current practice using the traditional Non-Destructive Evaluation (NDE) techniques while maintaining the risk below an acceptable level.
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Shi, Xiaoli, Bingbing Zhao, Yuling Yao, and Feng Wang. "Prediction Methods for Routine Maintenance Costs of a Reinforced Concrete Beam Bridge Based on Panel Data." Advances in Civil Engineering 2019 (June 11, 2019): 1–12. http://dx.doi.org/10.1155/2019/5409802.
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In order to make informed decisions on routine maintenance of bridges of expressways, the hierarchical regression analysis method was used to quantify factors influencing routine maintenance cost. Two calculation models for routine maintenance cost based on linear regression and time-series analysis were proposed. The results indicate that the logarithm of the historical routine maintenance cost is the dependent variable and the bridge age is the independent variable. The linear regression analysis was used to obtain a cost prediction model for routine maintenance of a beam bridge, which was combined with the quantity and price, and verified by a physical engineering example. In order to cope with the cost changes and future demands brought about by the emergence of new maintenance technologies, the time-series analysis method was used to obtain a model to predict the engineering quantities for the routine maintenance of a bridge based on standardized minor repair engineering quantities. Taking into account the actual cost of the minor repair project as well as the time-series analysis’ sample size demands, the annual engineering quantity was randomly decomposed into four quarterly data quantities, and the time-series analysis result was verified by physical engineering. These results can improve the calculation accuracy of the routine maintenance costs of reinforced concrete beam bridges. Furthermore, it can have a certain application value for improving the cost measurement module of bridge maintenance management systems.
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Ding, Qing Xin, Xiao Meng Liu, Xiao Zhong Lou, Zai Ming Han, Shi Min Zhang, Ying Cheng Tian, and Kun Liang Hui. "The Research on the Cutting Property and Structural Optimization on Tooth of Oil and Gas Pipeline Tapping Cutter." Advanced Materials Research 201-203 (February 2011): 1335–41. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1335.
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The tap cutter is one of the key equipment for the pipeline maintenance and rush repair, which in intended to solve broken tooth due to continuous cutting and impact during tapping. Three kinds of tap cutter optimization schemes are put forward and the finite element design and cutting experiment are applied to study its cutting property. The results show that, the optimized tooth can improve the tapping effect, largely enhance the cutting property, which has reached the level of the most advanced TDW tap cutter; thus, it is of great importance on the efficiency improvement and cost saving of the domestic pipeline maintenance and rush repair.
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Repin, Sergey, Sergey Maximov, Andrei Zazykin, and Nikolay Voropaev. "Development of strategy for ensuring operability of transport and technological machines." E3S Web of Conferences 164 (2020): 03046. http://dx.doi.org/10.1051/e3sconf/202016403046.
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The article presents the results of research in the field of ensuring the performance of complex technical objects on the example of transport and technological machines (TTM), which include transport equipment, as well as technological machines (excavators, loaders and other equipment that performs a technological process). The strategy of forming a system of maintenance and repairs taking into account the technical condition of TTM elements is described. The strategy provides for the division of structural elements of machines into four groups, depending on the principle approach to calculating the frequency of their repair. The criterion for determining the frequency of repairs is the probability of reaching the maximum values of characteristics during the inter-repair period, as well as the degree of criticality of the consequences of possible failure of the element.
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Andreeva, Liudmila. "Choosing a strategy for mining equipment repair service." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, no. 4 (June 25, 2021): 83–91. http://dx.doi.org/10.21440/0536-1028-2021-4-83-91.
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Relevance. The traditional practice of increasing production efficiency with a focus on technical reequipment and increase in the unit capacity of the equipment in operation, carried out without proper changes in the organization of production and for equipment repair service strategy leads to inefficient use of resources and loss of working time, which in turn affects the volume of output of the final product. Research aim is to select the optimal combination of planning strategies for mining equipment repair service. Research methodology includes the methods of structural and functional analysis, scientific generalization, and production experiment. Results. The advantages and disadvantages of planning repairs in the traditional system of planned preventive repairs and maintenance system based on technical diagnostics are presented. The main reasons for the increase in the number of emergency repairs are identified. The main components of effective preparation of repair impacts and methods for calculating the repair cycle on the example of an excavator fleet are given. The results obtained when considering the choice of strategy at one of the mining enterprises in the Urals are presented. Conclusions. To ensure the high performance of mining machinery and equipment during its operation, the effect can be obtained only by using the strategy of “condition-based” repair service with the use of technical diagnostics, condition monitoring of each unit, and repair actions planning that prevent sudden equipment failure.
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Câmara, A. S., D. Pereira, A. Fonseca, and S. Sequeira. "Maintenance Strategies for Sewerage Systems." Water Science and Technology 19, no. 3-4 (March 1, 1987): 603–11. http://dx.doi.org/10.2166/wst.1987.0240.
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The problem of decaying sewerage systems is a timely topic in many urban areas, due to its importance to societal needs and to the large amounts of capital expeditures needed to bring the concerned systems to an adequate level of serviceability. Thus, there is a need for better maintenance decision-making related to periodic inspection and cleaning, repair, rehabilitation or replacement of the equipment. In this paper, an approach offering integrated solutions to upgrade such systems, taking into account existing and foreseen structural and hydraulic conditions, is presented. The methodology relies upon a heuristic algorithm scheduling maintenance events. An application to the Almada sewerage network illustrates the method. Future improvements including the use of statistical maintenance theoretic concepts and artificial intelligence approaches are also discussed.
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Centeno, Grisselle, Rajesh Chaudhary, and Paula Lopez. "Developing Standard Times for Repair Activities for Transit Vehicles." Transportation Research Record: Journal of the Transportation Research Board 1927, no. 1 (January 2005): 112–22. http://dx.doi.org/10.1177/0361198105192700113.
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This paper presents a systematic method for determining repair time standards for transit vehicles. Most approaches typically used for time and motion study are designed mainly for manufacturing processes and thus find limited applications in transit environments. The methodology developed in this study is comprehensive and incorporates relevant factors such as maintenance procedures and work bay components and design, which are particular to the transit industry. This methodology has been employed on two systems: brake repair and preventive maintenance on buses. A major component of the methodology pertains to restructuring procedures, not only to improve work flow but also to normalize the operative assignments across transit shops. That focus facilitates productivity control and allows managers to assess training needs better. Outcomes reveal that the proposed methodology serves as a framework to develop valid standards that could have an impact on the efficiency of technicians while reducing total job completion time. Results are enhanced by the development of an information system that allows tracking of the time technicians take to complete the tasks and that represents, graphically, the performance rating based on the time standards developed. This tool assists supervisors during complex management decisions for resource allocation and scheduling. This project was initiated by the Florida Department of Transportation and the Center of Urban Transportation Research (CUTR). The research is part of the Florida Maintenance Training and Technical Assistance Program in CUTR and is guided by the committee of Transit Maintenance Consortium. The committee includes the managers and supervisors of the transit agencies throughout Florida.
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Durango-Cohen, Pablo L. "Maintenance and Repair Decision Making for Infrastructure Facilities without a Deterioration Model." Journal of Infrastructure Systems 10, no. 1 (March 2004): 1–8. http://dx.doi.org/10.1061/(asce)1076-0342(2004)10:1(1).
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Kung, C. J., and P. H. Wirsching. "Fatigue and Fracture Reliability and Maintainability of TLP Tendons." Journal of Offshore Mechanics and Arctic Engineering 115, no. 2 (May 1, 1993): 137–41. http://dx.doi.org/10.1115/1.2920103.
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A tension leg platform (TLP) tendon system experiences oscillatory tensile stresses, and therefore is vulnerable to fatigue and fracture. Because design factors have significant uncertainty, a reliability analysis to quantify structural performance is appropriate. A maintenance program of periodic inspection and repair shows promise for improving system reliability and enhancing structural integrity. The performance of a TLP tendon system was simulated in order to study the relationship of design factors to system reliability. Effects on system reliability and maintenance performance (repair and replacement rates) can be studied as a function of (a) number of joints, J; (b) number of members, M; (c) inspection frequency; (d) inspection sensitivity as defined by the POD (probability of detection) curve; (e) ultimate strength; (f) repair policy; etc. The performance of an initially damaged or flawed tendon system is investigated. The reliability of a system that uses pressurized tendons to detect through-thickness cracks is studied, as is the vulnerability of the tendon system before replacement of broken tendons.
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(Gray)Byrd, L. G. "Service Life and Life of Service: The Maintenance Commitments." Transportation Research Record: Journal of the Transportation Research Board 1650, no. 1 (January 1998): 5–9. http://dx.doi.org/10.3141/1650-01.
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The magnitude of today’s highway maintenance challenge, the impact of research on maintenance, basic objectives that should drive a maintenance program, and the progress made in meeting them over the last 4 decades are discussed. Highway maintenance should include the objectives of providing a consistently safe, comfortable, and efficient travel way for highway users and a safe environment for maintenance crews; providing optimum service life; maintaining as-built capacity and reliability; inviting, supporting, and using research and innovation; and performing with professionalism, competence, and diligence. Some of the challenges in meeting these objectives today are accelerating rates of deterioration, limited time available to work, complex interchanges and crowded rights-of-way, environmental restrictions, a litigious society, and public skepticism about all government functions. Three categories of responses are technologies, policies, and professionalism. A significant array of new, innovative tools and other products of research are making maintenance technology more effective. Maintenance managers need to be activists in promoting progressive policies in providing as-built capacity while performing maintenance and repair work and in procuring products and services. Maintenance policies should include recognition of user costs, use of performance specifications, fabrication of off-site repair components, design of repairable highway systems, use of corrosion-resistant materials, privatization of segments of the maintenance program, and establishment of an international maintenance technology reference program. Individual professionals must embrace continuing education, environmental sensitivity, community service, research and development, innovative management, and societal and political responsibilities.
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Shischenko, Elena, Anton Alekseev, and Vera Novikova. "COMPOSITIONAL MODEL DEVELOPMENT OF DC DRIVE MOTOR RELIABILITY ESTIMATE FOR TRAM-CARS." Bulletin of Bryansk state technical university 2020, no. 8 (August 2, 2020): 39–46. http://dx.doi.org/10.30987/1999-8775-2020-8-39-46.
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The investigation purpose is to develop a method for the assessment of reliability values of dc drive motors for tram cars the life of which approaches its completion which will allow correcting the maintenance and repair system in order to decrease the number of sudden failures and hence the number of unscheduled repair operations. According to the available rolling-stock (trams) repair statistics, a considerable part of unscheduled repair works is determined by failures of dc drive motors.
Reasoning from the investigation purpose one of the problems consists in the development of the simulator allowing the accurate definition of quantitative characteristics of reliability during the operation. The operation reliability of dc drive motors of tram-cars is affected considerably by the interaction of design structure elements and it raises a question of combined structural-functional patterns use during the formation of a compositional simulator for reliability estimate.
The results obtained show that the account of structural-functional ties of dc drive motors design elements in tram-cars during the simulator formation for reliability assessment allows obtaining more correct data for the definition of maintenance terms and repair works.
In such a way, the compositional model for reliability assessment of dc drive motors installed in tram-cars allows obtaining more exact dependences of their trouble-free operation probability that gives an opportunity to correct terms for scheduled-preventive repair, so that to decrease the number of sudden failures becoming more often, as it is seen in practice, at the approach of tram-car operation completion and decrease the number of unscheduled repair works.
The model offered for reliability assessment is urgent for the term correction of maintenance and repair works of tram-car dc drive motors the life of which comes to the completion and also for motors which run out of power.
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Sobanjo, J. O., Paul D. Thompson, Mathew Lewis, and Richard Kerr. "Estimating Agency Cost of Maintenance, Repair, and Rehabilitation for Florida Bridges." Transportation Research Record: Journal of the Transportation Research Board 1795, no. 1 (January 2002): 66–73. http://dx.doi.org/10.3141/1795-09.
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Sime, Muluneh, Gary Bailey, Elie Y. Hajj, and Rami Chkaiban. "Road Load Based Model for Vehicle Repair and Maintenance Cost Estimation." Transportation Research Record: Journal of the Transportation Research Board 2674, no. 11 (September 10, 2020): 490–97. http://dx.doi.org/10.1177/0361198120945977.
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A techno-economic model is developed based on road-load simulation results expressed in relation to slip energy (SE) at the tire–pavement interface and the repair and maintenance (R&M) cost obtained from published sources and data from state agencies. Tire SE allows for the consideration of aggressive acceleration and deceleration, high torque conditions (for instance, driving an upslope grade), and roadway curvature. Tire SE data used in this effort were generated using physics-based simulation models of different vehicle types for arrays of road conditions (e.g., grades, curvatures) and driving cycles (i.e., vehicle speed profiles). R&M costs were estimated for various vehicle categories and accumulated vehicle mileage. The approach is based on relating the probability density functions (PDFs) of SE and R&M costs. Asymptotic series expansion for an incomplete gamma function was used to approximate the gamma functions and to determine the gamma ratio function that is used as the coefficient to SE to estimate R&M costs. The average R&M cost per mile results from the model compared with the arithmetic mean R&M cost data from fleet operators and published data. The model can serve as a method for predicting R&M cost as a function of road load to vehicle fleet.
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Sprouse, John B., and Alessandra Bianchini. "Optimization of Pavement Repair Construction Activities." Transportation Research Record: Journal of the Transportation Research Board 2674, no. 1 (January 2020): 160–67. http://dx.doi.org/10.1177/0361198119898114.
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Transportation infrastructures are essential for supporting any community activity, from economical function to emergency services. The importance of maintaining the infrastructure in serviceable conditions must be evaluated in relation to the impact that maintenance activities may induce to the communities served by roadways. Pavement repair is composed of different activities characterized by time, efficiencies, performance, and personnel availability, and the optimization of such activities can definitely limit the impact on the overall roadway service. The methodology proposed in this study is centered on fuzzy reasoning and aims to quantify the repair rate and, therefore, the impact of the overall activity. As in the examples proposed in the analysis, based on the repair size and thicknesses, road classification, and traffic, the maintenance agency has the possibility of making a sound choice in road closure or establishing a detour for a limited period of time. Combining the model results with additional knowledge about the repair location and roadway service level at the moment of the repair, agencies have the ability to reassign equipment, crews, or other element, with the objective of minimizing the construction activity impact on the community. The model’s results are promising; successive steps consist of tailoring such a model with each agency-specific scenarios, equipment fleet and related performance, crew skill level, and lastly, roadway network configuration.
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Pelt, Maurice, Konstantinos Stamoulis, and Asteris Apostolidis. "Data analytics case studies in the maintenance, repair and overhaul (MRO) industry." MATEC Web of Conferences 304 (2019): 04005. http://dx.doi.org/10.1051/matecconf/201930404005.
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Data analytics seems a promising approach to address the problem of unpredictability in MRO organizations. The Amsterdam University of Applied Sciences in cooperation with the aviation industry has initiated a two-year applied research project to explore the possibilities of data mining. More than 25 cases have been studied at eight different MRO enterprises. The CRISP-DM methodology is applied to have a structural guideline throughout the project. The data within MROs were explored and prepared. Individual case studies conducted with statistical and machine learning methods, were successfully to predict among others, the duration of planned maintenance tasks as well as the optimal maintenance intervals, the probability of the occurrence of findings during maintenance tasks.
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Filippov, Dmitry, and Elena Grigoryeva. "Federal and regional standards for highways maintenance and repair costs." SHS Web of Conferences 112 (2021): 00042. http://dx.doi.org/10.1051/shsconf/202111200042.
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The current conditions of Russian territories road infrastructure, regional budgetary funding, differences in economic potential and the economy structure of the constituent entities of the Russian Federation determine the relevance of the development and improvement of the regional regulatory base. This is important in the field of tariff policy, one of the elements of which is the approval of basic standards and rules for calculating the amount of budgetary funds for capital repairs, repairs and maintenance of regional road network. This article is devoted to the study of the regional practice that has developed in the Russian Federation for the establishment of standard costs for capital repairs, repairs and maintenance of regional and intermunicipal roads in comparison with federal ones. The work consists of two logically related structural elements: an overview and an analytical part. The review revealed the differentiation of the size of budgetary allocations in the context of subjects and federal districts. In the analytical part, an attempt is made to determine the closeness between federal and regional standards and, as a result, to identify the range of regions that practice linking regional standards to federal ones.
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Et al., Z. G. Mukhamedova. "RESOURCE-SAVING MAINTENANCE AND REPAIR OF SPECIAL SELF-PROPELLED ROLLING STOCK." Psychology and Education Journal 58, no. 1 (January 15, 2021): 3550–55. http://dx.doi.org/10.17762/pae.v58i1.1305.
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The article provides the issues of improving the models of reliability and optimization of maintenance and repair of special self-propelled rolling stock (SPRS) with a compatible system of diagnostics. A new maintenance strategy is proposed, taking into account the new requirements of the self-propelled rolling stock. Examples of solving practical problems of reliability indices are considered.
The study of the reliability of SPRS, as an object, is advisable to start with its presentation in the form of a system of assembly units. In this sense, the level of consideration is important. Figure 1 gives a structural diagram of SPRS, as a system consisting of elements. for several possible levels of consideration. SPRS, as a system of elements, makes it possible to concretize the task of analyzing and improving the reliability model and developing measures to perfect it.
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Muda, M. K. H., Faizal Mustapha, K. D. Mohd Aris, and Mohamed Thariq Hameed Sultan. "Fabrication Technique for Bio-Composite Patch Repair on Laminated Structures of CFRP Plate." Applied Mechanics and Materials 564 (June 2014): 366–71. http://dx.doi.org/10.4028/www.scientific.net/amm.564.366.
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Laminated structures are assembled so that the fibre orientation provides most of desired mechanical properties and the matrix largely determines the environmental performance. Composites laminate structures are used in a wide range of applications in aerospace, marine, automotive, surface transport and sports equipment markets. Damage to composite components is not always visible to the naked eye and the extent of damage is best determined for structural components by suitable Non Destructive Test (NDT) methods. Alternatively the damaged areas can be located by simply tapping the composite surface and listening to the sound. The damaged areas give a dull response to the tapping, and the boundary between the good and damaged composite can easily be mapped to identify the area for repair. Awareness of and inspection for composite damage should be included in the regular maintenance schedules for composite structures. Particular attention would be made to areas which are more prone to damage. The repair can be done by using composite itself or bio-composite. Bio-composite is a reinforcement of natural fibre such as plant and a material that formed by matrix or resin. Then repairs to aircraft structures are controlled and should be carried out according to the Aircraft Structural Repair Manual (SRM). For other applications the repaired components would normally be expected to meet the original specifications and mechanical performance requirements. This paper presents the fabrication technique including patch repair by using bio-composite which is kenaf and its aim to give a general approach to composite fabrication on patch repair in all applications. Through the described approach, the life of the structure is expanded and met the properties requirements such as low cost, fairly good mechanical properties, high specific strength, non-abrasive, eco-friendly and bio-degradability characteristics.
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Yan, Ji Hong, Yu Yan Wang, and Xu Zhang. "Genetic Algorithm Based Methodology for Optimal Maintenance Scheduling of Multi-Unit Systems." Key Engineering Materials 450 (November 2010): 539–43. http://dx.doi.org/10.4028/www.scientific.net/kem.450.539.
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This paper presents a novel methodology for optimal maintenance scheduling of multi-unit systems under predictive maintenance (PdM) environment. A maintenance scheduling model for multi-unit system is established considering performance degradation of units, dynamic characteristics of the system, economic dependence and structural dependence between units, and constraints of maintenance resources. The deterioration of units is modeled by Weibull distribution. Three maintenance actions, as minor repair, imperfect overhaul and replacement are considered to arrange the PdM schedule of a system. The genetic algorithm based methodology is employed to obtain the near optimal scheduling which results in a relatively minimal maintenance cost rate. The scheduling results demonstrate that the proposed methodology is feasible and effective.
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Zhao, Fengjun, Yuhang Tang, Jianjun Wu, Zhi Huang, Mingyue Gao, and Yanliang Long. "Mechanical Characteristics of Asphalt Pavement Pothole Maintenance." Journal of Engineering 2021 (July 7, 2021): 1–11. http://dx.doi.org/10.1155/2021/6653786.
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Traditionally, potholes are mainly paved for maintenance, and the asphalt mixture needs to be compacted. But due to the construction quality problem, the compacting degree of asphalt mixture may not be enough and the void ratio of asphalt mixture may not meet the requirements, resulting in the premature damage of the potholes after repair. If the repair material can be prefabricated, this problem will be well solved. So, based on the structure form of the prefabricated rapid maintenance of asphalt pavement, this paper aims to determine the most unfavorable loading position in pothole repair, which was established by the ANSYS software with the finite element model. The results show that the most unfavorable loading position of tensile stress for patch materials and joint filling material is C1-1 (A2-2) and the most unfavorable loading position of shear stress for joint filling material and leveling layer is B2-1 and C1-5. Subsequently, the influences of the material modulus, size, thickness, and modulus of the old pavement material on the potholes are calculated by using the finite element model under the most unfavorable loading position.
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Raja, Sripriya, and Bennett Van Houten. "The Multiple Cellular Roles of SMUG1 in Genome Maintenance and Cancer." International Journal of Molecular Sciences 22, no. 4 (February 17, 2021): 1981. http://dx.doi.org/10.3390/ijms22041981.
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Single-strand selective monofunctional uracil DNA glycosylase 1 (SMUG1) works to remove uracil and certain oxidized bases from DNA during base excision repair (BER). This review provides a historical characterization of SMUG1 and 5-hydroxymethyl-2′-deoxyuridine (5-hmdU) one important substrate of this enzyme. Biochemical and structural analyses provide remarkable insight into the mechanism of this glycosylase: SMUG1 has a unique helical wedge that influences damage recognition during repair. Rodent studies suggest that, while SMUG1 shares substrate specificity with another uracil glycosylase UNG2, loss of SMUG1 can have unique cellular phenotypes. This review highlights the multiple roles SMUG1 may play in preserving genome stability, and how the loss of SMUG1 activity may promote cancer. Finally, we discuss recent studies indicating SMUG1 has moonlighting functions beyond BER, playing a critical role in RNA processing including the RNA component of telomerase.
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Hegazy, Tarek. "Computerized System for Efficient Delivery of Infrastructure Maintenance/Repair Programs." Journal of Construction Engineering and Management 132, no. 1 (January 2006): 26–34. http://dx.doi.org/10.1061/(asce)0733-9364(2006)132:1(26).
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