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1
Haidvogel, Robert F. "The Afloat maintenance Command: organizational and funding issues in Navy ship maintenance, repair, and modernization." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23521.
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Approved for public release; distribution is unlimitedThe goal of current Navy surface ship maintenance and repair strategy is to sustain readiness and to maximize both combat capability and the amount of time ships are available for employment during their lifetime. The established organizational framework of the Navy to perform this task includes a complex array of activities that are effective overall, but at the expense of efficiency. The current drawdown in budget resources requires that the goals of ship maintenance and modernization be met with improved efficiency. The Afloat Maintenance Command is a proposal to restructure the existing maintenance hierarchy. Improvements in the process of maintenance and modernization are incorporated in the Afloat Maintenance Command through the elimination of redundancies in capabilities and the improvement of funding flows to enhance organizational efficiency and effectiveness. This thesis will provide an overview of the Afloat Maintenance Command and its possible organization in consolidating assets from existing maintenance activities. Additionally, funding alternatives for the Afloat Maintenance Command will be developed and assessed.
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Ng, Peter Yip-Chuen. "Cooperative teamwork for quality customer service in the Hong Kong shiprepair yards environment." Thesis, Curtin University, 2003. http://hdl.handle.net/20.500.11937/2468.
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During the turbulent times facing contemporary organisations, managers and employees need a precise understanding of the nature of team dynamics that develops quality service to customers. Extensive literature searches reveal few research studies focused on the nature of teamwork, which develops value to customers. The purpose of this study is to examine the value of teamwork for providing quality service within the Hong Kong shiprepair industry, outline the insight gleaned and recommend future research. This study aims to link empirically the Western developed Deutsch's (1949a, 19496, 1973, 1980, 1985, 1990) Theory of Cooperation and Competition with the innovation of teamwork and to assist in understanding the variance in the performance of these teams. Literature suggests that the relationships and interaction within the work teams can very much impact the overall performance of these work teams. The extent that these work teams are able to develop cooperative goals can promote productive and constructive communication and problem solving (constructive controversy) in their interactions. A constructive interaction leads to team members' perception of high team confidence. With trust, strong work relationship, team morale and perceived confidence, team effectiveness is enhanced on quality customer service (Alper, Tjosvold and Law, 1998; Tjosvold, Hui and Law, 1998; Tjosvold, Moy and Sasaki, 1996, 1999; Wong et al., 1999). The research also tests the extent of impact of traditional Chinese values of power distance and collectivism as contributing to cooperative goals and encourages an openminded discussion of opposing views (constructive controversy). It proposes that by adopting cooperative goals, shiprepair yard management in Hong Kong may meet the twin challenges of involving employees fully into the organisation and providing quality service to customers.The result suggests that the Western derived Theory of Cooperation and Competition, if appropriately and skillfully expressed, might have the potential as one alternative to understand the goal interdependence dynamics as experienced by the Hong Kong Chinese in the shiprepair industry. Nevertheless, the result is not confirmatory to the main hypothesis of the study that team confidence is significantly related to quality customer service. Findings of this study question whether a Western theory or research instrument derived is appropriate for application to a Chinese work setting (Bond and Wang, 1983). Although it is useful to test concepts developed in one culture to another, yet theories from the West cannot be assumed to apply in the East (Hofstede, 1993; Triandis, 1983). An important finding of this research is, however, that this Western derived theory might not be suitable to be applied in a work group of very low levels of education and/or low exposure to the modern workplace practice and Western influences.
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Hart, David T. "Ship shock trial simulation of USS Winston S. Churchill (DDG-81) : surrounding fluid effect /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FHart.pdf.
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Ng, Peter Yip-Chuen. "Cooperative teamwork for quality customer service in the Hong Kong shiprepair yards environment." Curtin University of Technology, Graduate School of Business, 2003. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=15097.
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During the turbulent times facing contemporary organisations, managers and employees need a precise understanding of the nature of team dynamics that develops quality service to customers. Extensive literature searches reveal few research studies focused on the nature of teamwork, which develops value to customers. The purpose of this study is to examine the value of teamwork for providing quality service within the Hong Kong shiprepair industry, outline the insight gleaned and recommend future research. This study aims to link empirically the Western developed Deutsch's (1949a, 19496, 1973, 1980, 1985, 1990) Theory of Cooperation and Competition with the innovation of teamwork and to assist in understanding the variance in the performance of these teams. Literature suggests that the relationships and interaction within the work teams can very much impact the overall performance of these work teams. The extent that these work teams are able to develop cooperative goals can promote productive and constructive communication and problem solving (constructive controversy) in their interactions. A constructive interaction leads to team members' perception of high team confidence. With trust, strong work relationship, team morale and perceived confidence, team effectiveness is enhanced on quality customer service (Alper, Tjosvold and Law, 1998; Tjosvold, Hui and Law, 1998; Tjosvold, Moy and Sasaki, 1996, 1999; Wong et al., 1999). The research also tests the extent of impact of traditional Chinese values of power distance and collectivism as contributing to cooperative goals and encourages an openminded discussion of opposing views (constructive controversy). It proposes that by adopting cooperative goals, shiprepair yard management in Hong Kong may meet the twin challenges of involving employees fully into the organisation and providing quality service to customers.The result suggests that the Western derived Theory of Cooperation and Competition, if appropriately and skillfully expressed, might have the potential as one alternative to understand the goal interdependence dynamics as experienced by the Hong Kong Chinese in the shiprepair industry. Nevertheless, the result is not confirmatory to the main hypothesis of the study that team confidence is significantly related to quality customer service. Findings of this study question whether a Western theory or research instrument derived is appropriate for application to a Chinese work setting (Bond and Wang, 1983). Although it is useful to test concepts developed in one culture to another, yet theories from the West cannot be assumed to apply in the East (Hofstede, 1993; Triandis, 1983). An important finding of this research is, however, that this Western derived theory might not be suitable to be applied in a work group of very low levels of education and/or low exposure to the modern workplace practice and Western influences.
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Drake, Roy. "Cost benefit analysis of pier refueling versus barge refueling at the Fleet Industrial Supply Center /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FDrake.pdf.
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Thesis (M.B.A.)--Naval Postgraduate School, June 2003."MBA professional report."--Cover. Thesis advisor(s): Raymond Franck, Donald Eaton. Includes bibliographical references (p. 41). Also available online.
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Dearey, William M. "The effect of funding scheme on the performance of Navy repair activities." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FDearey.pdf.
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Marchbanks, Keith Lynn. "Ships maintenance, repair and modernization overseas : requirement concepts and funding issues in maintaining material readiness of deployed forces." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24035.
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Mischaniuk, Mykhailo. "Usage of Social Network Platforms for Business Support in the Field of Car Repair Services." Master's thesis, Vysoká škola ekonomická v Praze, 2015. http://www.nusl.cz/ntk/nusl-261965.
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The diploma thesis deals with the problem of using social networks in the field of car repair services. The primary aim is to provide the recommendations for businesses in a structured way on how to better utilize these networks to get better competitiveness. This work is divided into three parts. The first theoretical part deals with basic description of networks and their statistics. This part also covers some basic tools that we can use to analyze and maintain social network platforms. The second analytical part deals with competitive analysis in car repair services and gives an overview of the most popular Runet social network platforms. The third practical part provides structured view on all important aspects of social platform maintenance and behaviour. In this section, you can find the description of various views and the recommendations I give to the specific car repair service.
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Савчук, Андрій Володимирович, and Andrii Volodymyrovych Savchuk. "Проект дільниці ремонтного цеху для відновлення кулькової опори 1103-2304024 передньої підвіски автомобіля ЗАЗ 1103 з дослідженням зовнішніх швидкісних характеристик автомобіля." Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2020. http://elartu.tntu.edu.ua/handle/lib/33558.
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Роботу виконано на кафедрі автомобілів Тернопільського національного технічного університету імені Івана Пулюя Міністерства освіти і науки України. Захист відбудеться 23 грудня 2020 р. о 14:00 годині на засіданні екзаменаційної комісії № 10 у Тернопільському національному технічному університеті імені Івана Пулюя за адресою: 46001, м. Тернопіль, вул. Текстильна, 28, навчальний корпус № 9, ауд. 106.В кваліфікаційній роботі розроблено технологію відновлення кулькової опори 1103-2304024 передньої підвіски автомобіля ЗАЗ 1103, а також досліджено зовнішні швидкісні характеристики автомобіля.
The qualification work developed the technology of restoration of ball support 1103-2304024 front suspension of zaz 1103 car, as well as investigated external speed characteristics of the car.
ВСТУП 6 1 ЗАГАЛЬНО-ТЕХНІЧНИЙ РОЗДІЛ 1.1 Опис конструкції й призначення складального вузла. Аналіз технологічності 7 1.2 Аналіз результатів випробувань на плавність ходу 8 1.3 Основні вимоги до підвіски 9 1.4 Вибір конструкції підвіски 9 1.4.1 Підвіски на подвійних поперечних важелях 10 1.4.2 Підвіска на поздовжніх важелях 10 1.4.3 Підвіска на поздовжніх і поперечних важелях 11 1.4.4 Підвіска Макферсон 12 1.4.5 Амортизатори зі змінним демпфіруванням 12 1.5 Висновки та постановка задачі на кваліфікаційну роботу 13 2 ТЕХНОЛОГІЧНИЙ РОЗДІЛ 2.1 Вибір типу виробництва й форми організації складальних робіт 14 2.2 Розробка й нормування технологічного процесу складання 14 2.3 Вибір методу забезпечення заданої точності при складанні. Розрахунки розмірного ланцюга 16 2.4 Технологія виготовлення кулькової опори 18 2.4.1 Опис умов роботи й конструкції кулькової опори 18 2.4.2 Визначення типу виробництва виготовлення кулькової опори 19 2.4.3 Вибір методу одержання заготовки й економічне обґрунтування способу її одержання 19 2.5 Розробка маршруту обробки заготовки. Вибір устаткування 22 2.6 Розрахунки припусків і міжопераційних розмірів 23 2.7 Проектування технологічної операції 26 3 КОНСТРУКТОРСЬКИЙ РОЗДІЛ 3.1 Вибір вертикальної пружної характеристики підвіски 30 3.2 Аналіз кінематики підвіски 32 3.3 Розрахунки пружини 34 3.4 Вибір і розрахунки амортизатора 36 3.5 Розрахунки навантажувальних режимів 39 3.6 Розрахунки деталей підвіски на міцність і довговічність 45 4 НАУКОВО-ДОСЛІДНИЙ РОЗДІЛ 4.1 Тяговий розрахунок автомобіля 47 4.1.1 Швидкісна зовнішня характеристика двигуна 47 4.1.2 Передаточні числа трансмісії. Передаточне число головної передачі 51 4.1.3 Передаточні числа коробки передач 52 4.1.4 Коректування передаточних чисел трансмісії 53 4.1.5 Тяговий баланс автомобіля 54 4.1.6 Динамічна характеристика автомобіля 55 4.1.7 Характеристика прискорення автомобіля 56 5 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ 64 ЗАГАЛЬНІ ВИСНОВКИ 72 ПЕРЕЛІК ПОСИЛАНЬ 73 ДОДАТКИ
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DeWitt, Amy Murphy. "Surface ship maintenance planning process." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28580.
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Jackson, Michele R. D. "Tender and repair ship load list forecasting." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA309850.
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Alhouli, Yousef Mohammed. "Development of ship maintenance performance measurement framework to assess the decision making process to optimise in ship maintenance planning." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/development-of-ship-maintenance-performance-measurement-framework-to-assess-the-decision-making-process-to-optimise-in-ship-maintenance-planning(3056c2a2-7301-4223-990c-e23432b550bb).html.
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Effective maintenance planning is essential and important in any organisation that is responsible for procuring and managing complex assets. In the marine shipping industry maintenance planning is very significant due to its complexity and the obligations on shipping organisations to comply with certain regulations and requirements. Moreover, improper planning can reduce the ship's availability, which may in turn, be reflected in the revenue of the company. Another issue that requires attention in this field is the cost of maintenance, since improper or inadequate planning could result in breakdowns that could increase the cost of maintenance.This research aims to identify the key factors that affect ship maintenance planning and to provide a framework that can help the decision maker to identify and choose optimum decisions regarding ship maintenance. The research is divided into four stages in order to achieve its objectives and to address the research problem.The first stage is the review of the literature to identify the need for maintenance and to select the key factors that affect maintenance planning. The findings indicate that: maintenance scheduling, selection of maintenance strategy, ship construction, crew compensation, and shipyard selection are the most important factors.The second stage is to evaluate maintenance performance measurements for the marine shipping industry by conducting case study and interviews with professionals involved in the mercantile industry. Semi-structured interviews were conducted with six senior staff experts from three different organisations. The results show that: dry docking scheduling, maintenance costs and budgets, customer satisfaction, employees' satisfaction, classification requirements, and the ship's maintenance requirements are the main factors that have great influence on maintenance planning.The third stage is to develop new methodology to measure the maintenance performance in the marine shipping organisation which is the ship maintenance performance measurement (SMPM) framework. The developed method was validated to assist managers in making the right decisions in ship maintenance planning. The framework was developed based on ten thematic criteria that can be used as indicators for potential organisation growth, i.e., maintenance strategy; dry docking scheduling; budget and costs; the ship's equipment; customer satisfaction; employees; health, safety and environment; learning and growth; classification requirements; and the ship's operation and demands requirements. Interviews were conducted with key personnel from the Kuwait Oil Tanker Company (KOTC) to validate the framework.The fourth stage demonstrates that an optimised schedule for the dry docking of ships for routine maintenance has been constructed. This is accomplished on the basis of one measured criterion, dry docking scheduling, by using an integer programming model to maximise the ship's availability within the company fleet. The model is defined by three constraints: the maintenance window, maintenance completion, and the ship's limit. The model was validated using data from KOTC, and the results depict an optimum solution for maintenance scheduling, maximising the ship's availability to 100% and not less than 92%.
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Al-kaabi, Hamad A. "Airlines' maintenance, repair and overhaul (MRO) configurations." Thesis, Cardiff University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437225.
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Donaldson, Isaac J. "Visualization of big data through ship maintenance metrics analysis for fleet maintenance and revitalization." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/41370.
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Approved for public release; distribution is unlimited.There are between 150 and 200 parameters for measuring the performance of ship maintenance processes in the U.S. Navy. Despite this level of detail, budgets and timelines for performing maintenance on the Navy's fleet appear to be problematic. Making sense of what these parameters mean in terms of the overall performance of ship maintenance processes is clearly a big data problem. The current process for presenting data on the more than 150 parameters measuring ship maintenance performance costs and processes, containing billions of data points, is still done by static, cumbersome spreadsheets. The central goal of this thesis is to provide a means to aggregate voluminous maintenance data in such a way that the causal factors contributing to cost and schedule overruns can be better understood by ship maintenance leadership. Big data visualization software was examined to determine if visualization tools could improve the understanding of U.S. Navy ship maintenance by its leaders. This thesis concludes that the visualization of big data supports decision making by enabling leaders to quickly identify trends, develop a better understanding of the problem space, establish defensible baselines for monitoring activities, perform forecasting, and evaluate metrics for use.
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Bridges, Michael R. "Optimally funding Army Installation repair and maintenance activities." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA341063.
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Thesis (M.S. in Operations Research) Naval Postgraduate School, September 1997."September 1997." Thesis advisor(s): Robert F. Dell. Includes bibliographical references (p. 43-44). Also available online.
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Nikou, Vasilios 1972. "Welded repair and maintenance in the space environment." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/91796.
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Thesis (Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2003.Includes bibliographical references (leaves 73-75).
by Vasilios Nikou.
Nav.E.
S.M.
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Kelly, Annette. "Comparative analysis of intermediate level maintenance repair process." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FKelly.pdf.
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Pittas, Pantelis Aristeidis 1977. "Global ship-repair industry : evaluation of current situation and future trends." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/8967.
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Thesis (S.M. in Ocean Systems Management)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M. in Naval Architecture and Marine Engineering)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1999.Includes bibliographical references (leaves 96-98).
This thesis is an analysis of the Global Ship-repair market. This subject is of great interest to all involved in the shipping industry, as it is one of the industry's major components. There are many yards that specialize in ship-repair and bear the necessary equipment and facilities to meet shipowners' needs and specifications. The service mix varies though, depending upon the strategic decisions made by the different shipyards so as to optimize their efficiencies. Different shipyards and geographical regions offer different varieties of services and specialization. Thereby, my aim is to define, analyze, and understand the mechanisms of the ship-repair market. To do so, I will first look on the market as a single unit. I will then segment the whole ship-repair industry into geographical regions, analyze them separately, and compare them. Through this process, I shall establish a way for a shipowner to more appropriately choose the shipyard that best meets his needs. So as to carry out the above analysis, I will have to compare the different yards on a common basis. For that purpose, a dry docking specification for an existing 34,000 dwt bulk-carrier vessel was sent to numerous yards around the globe on request for offers. Collecting data was not trouble-free; some shipyards did not respond to our drydocking specification at all, while others did not have free space to facilitate the vessel. After several attempts, more than thirty offers from around the world were aggregated, providing an ample set of data to carry out the necessary calculations. What follows next is a look into the future trends of the ship-repair market.
by Pantelis Aristeidis Pittas.
S.M.in Naval Architecture and Marine Engineering
S.M.in Ocean Systems Management
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McLay, Deidre L. "Performance measures for U.S. Pacific Fleet Ship Intermediate Maintenance Activities." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24006.
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Lee, Hock Guan. "A study on predictive analytics application to ship machinery maintenance." Thesis, Monterey California. Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37659.
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Approved for public release; distribution is unlimitedEngine failures on ships are expensive, and affect operational readiness critically due to long turn-around times for maintenance. Prior to the engine failures, there are signs of engine characteristic changes, for example, exhaust gas temperature (EGT), to indicate that the engine is acting abnormally. This is used as a precursor towards the modeling of failures. There is a threshold limit of 520 degree Celsius for the EGT prior to the need for human intervention. With this knowledge, the use of time series forecasting technique, to predict the crossing over of threshold, is appropriate to model the EGT as a function of its operating running hours and load. This allows maintenance to be scheduled just in time. When there is a departure of result from the predictive model, Cumulative Sum (CUSUM) Control charts can then be used to monitor the change early before an actual problem arises. This paper discusses and demonstrates the proof of principle for one engine and a particular operating profile of a commercial vessel with the use of predictive analytics. The realization with time series forecasting coupled with CUSUM control chart allows this approach to be extended to other attributes beyond EGT.
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Toves, Peter Rocky. "Evaluating Success Factors in Implementing E-Maintenance in Maintenance, Repair, and Overhaul (MRO) Organizations." ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/767.
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Despite more than a decade-long process to transition aircraft maintenance practices from paper-to electronic-based systems, some organizations remain unable to complete this transition. Researchers have indicated that while organizations have invested resources in technology improvements, there remains a limited understanding of the factors that contribute to effectively managing technology-enabled change. The purpose of this case study was to identify and explore socio-technical (ST) factors that inhibit an effective transition from a paper-based system to an electronic-based system for aircraft maintenance. A conceptual model applying theories of change management, technology acceptance, systems thinking, and ST theory informed the research. Thirteen participants provided data via semistructured interviews, field observations, follow-up interviews, other documentation, and a questionnaire. Data were analyzed with open and axial coding techniques to identify themes, which were then crosschecked and triangulated with observation and follow-up interview data. Findings revealed communication issues, a fundamental misconception in training, and a false assumption that all personnel easily acquire computer literacy. Benefits gained from this study should assist maintenance, repair, and overall (MRO) organizations within the Department of Defense to improve current and future technology implementation as the research underscores real-life issues from a comparable organization. The implications for positive social change provide a greater understanding of technology-enabled change and contribute to the development of best practices for technology initiatives that address common ST issues in the MRO workplace.
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Luyt, Leslie. "Automated grid fault detection and repair." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1006693.
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With the rise in interest in the field of grid and cloud computing, it is becoming increasingly necessary for the grid to be easily maintainable. This maintenance of the grid and grid services can be made easier by using an automated system to monitor and repair the grid as necessary. We propose a novel system to perform automated monitoring and repair of grid systems. To the best of our knowledge, no such systems exist. The results show that certain faults can be easily detected and repaired.TeX
Adobe Acrobat 9.51 Paper Capture Plug-in
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Gamede, Cyril Vuyani. "Boiler maintenance using expert systems." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/18798.
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This research explores the application of expert systems to the maintenance of boilers, are as follows: and its main objectives [1] To explore the application of expert systems in the maintenance of boilers. [2] To simplify the task of boiler maintenance with the help of expert systems. [3] To improve the skills of boiler maintenance workers through the knowledge 'captured ' or 'preserved' by expert systems. [4] To minimise errors which may cost time, money, effort and possible risk of injury to boiler maintenance personnel. [5] To develop a prototype expert system which can advise and assist boiler maintenance personnel. [6) To contribute to research in the application of expert systems in the field of engineering.
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De, Wet Vorster Hendrik. "An analysis of the effectiveness of the asset maintenance plan at Spoornet : case study : class diesel locomotives (traction and rolling stock)." Thesis, Peninsula Technikon, 2001. http://hdl.handle.net/20.500.11838/1019.
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Thesis (MTech (Business Administration))--Peninsula Technikon, 2001Maintenance of locomotives is the main function of Bellville Locomotive Traction Depot in the Western Cape. Therefore, it is important to have a sound maintenance plan in place, to prevent a negative impact on the availability and reliability of locomotive supply for hauling power to train services. The purpose of the research is to determine the causes of the increased frequency of maintenance through a case study relating to 35-class locomotives. The abnormal increased frequency of wheel change and inter-bogie control repairs on 35-class diesel locomotives is investigated. A research survey was adopted, which included questionnaires and personal interviews based on the literature search. The target group is L&N section, which includes below-deck maintenance, overhaul and change out, repairs to locomotive bogies, frames, wheels, snubbers, inter-bogie control and traction motors. Sixteen people are responsible for all below-deck repairs and service of 52 locomotives. The results of the research will expose the shortcomings of the maintenance plan and propose solutions. This will be achieved by testing the effectiveness of the existing maintenance plan at Spoornet through the identification of the causes for the abnormal increase in wheel changes and inter-bogie control repairs on 35-class diesel locomotives. The outcome from this case study research will be to quantify the benefits arising from the effective application of a maintenance plan.
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An, Wei 1963. "Strengthening of concrete beams with composite plastic plates." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277246.
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This study investigates the feasibility of strengthening reinforced concrete beams with epoxy-bonded Glass-Fiber-Reinforced-Plastic (GFRP) plates. The composite plate is epoxy-bonded to the tension flange of the beam to increase its stiffness and strength. Seven rectangular and one T-beam, retrofitted with composite plates, were tested to failure under symmetrical 4-point bending. The load versus deflection and the load versus strain in the composite plate, steel rebar and the extreme compression fiber of concrete were measured and plotted for the midspan section throughout the entire range of loading up to failure. Analytical models based on the equilibrium of forces and compatibility of deformations were developed to predict the stresses and deformations of the beam in the linear and nonlinear regions. The predicted and measured results correlated well. The analytical models were used in a parametric study to investigate the effects of design variables such as, plate area, plate strength and stiffness, reinforcement ratio, etc., on the moment-curvature relationships of typical rectangular and T cross sections.
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Schatz, Duane J. "Use of the over and above work clause in ship repair contracts." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA293751.
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Thesis (M.S. in Management) Naval Postgraduate School, December 1994."December 1994." Thesis advisor(s): Rebecca J. Adams, Mark W. Stone. Includes bibliographical references (p. 73-74). Also available online.
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Sinha, Ashutosh. "Modelling commercial process in ship repair & conversion using artificial neural networks." Thesis, University of Newcastle Upon Tyne, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556033.
Full textAbstract:
Abstract This thesis discusses the development of a simulation model using artificial neural networks to model and predict the outcome of commercial process at a Shiprepair Conversion yard. Based on the data collected from across the A&P group a simulation model of the commercial process was developed. It was considered that contrary to the popular belief of securing one in five enquires as a potential contract the model can predict the probability of the outcome of a contract. The aim of the simulation is to ultimately develop a decision making tool for the ship repair industry which could help predict the outcome of the an enquiry based on certain parameters, hence reducing the estimating time and giving yards an advantage over their competitors. The research work looks into the estimation and management of Shiprepair and conversion processes, identifies the key stakeholders in the process and looks at the inherent risks of outdated technologies. The development of an intelligent supply chain management will enhance the yards product ability, help reduce the over heads and decrease the tendering process for the total repair. The challenges of assembling and deploying integrated supply chain are not unique to the Shiprepair industry. Increasing international pressures are motivating all industrial corporations continuously to reduce cycle times, manufacturing & administrative costs and to increase productivity. In addition, to improve internal production efficiency shipyards are turning to external factors such as subcontractors and suppliers. Improving supply chain management can help yards better understand their production enterprises and these insights can be used to optimize processes and facilities. A key element to improve the efficiency of ship repair supply chain is to improve the integration of, organizations operating within a supply chain. Describing Shiprepair in a nutshell it would right to say that: - 8 - --------_1 "There are known knowns. There are things we know that we know. There are known unknowns. That is to say, there are things that we now know we don't know. But there are also unknown unknowns. There are things we do not know we don't know" 1 and Shiprepair is full of unknown unknowns, the thesis attempts to identify a few.
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Young, Cynthia Jane. "Knowledge Management and Innovation on Firm Performance of United States Ship Repair." ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/2183.
Full textAbstract:
With the decreasing labor forces throughout the United States, if leadership of the ship repair industry does not incorporate knowledge sharing and innovation into their daily business practices, knowledge will be lost during employee departures and turnover of teams from project-to-project, resulting in decreasing firm performance within their organizations. This was a correlation study to determine if there was a correlation between knowledge management, innovation, and firm performance. Data were collected from 69 CEO/Presidents, Human Resource personnel, or members in leadership positions of the Virginia Ship Repair Association in the mid-Atlantic region of the United States. The theoretical framework for this study was the unified model of dynamic knowledge creation with the key constructs of the socialization, externalization, combination, and internalization process; places of knowledge sharing, whether they are virtual, physical, or mental; and leadership. Data collection occurred through an online survey. Multiple linear regression analyses significantly predicted the dependent variable, F(2, 66) = 17.33, p = .000, R2 = .344. Increasing knowledge sharing and innovation practices provides for positive social change for the personnel of these organizations, since the skills they learn within their organizations are immediately usable in their personal endeavors in their churches, neighborhoods, and family relationships and are transferrable to those they interact with outside of their organizations.
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盧英明 and Ying-ming Lo. "Analysis of maintenance service figures of domestic towngas appliance." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31976645.
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Werenskjold, G. Karl. "An exploratory analysis of corrective maintenance during extended surface ship deployments." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA356567.
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Thesis (M.S. in Operations Research) Naval Postgraduate School, September 1998."September 1998." Thesis advisor(s): Donald P. Gaver. Includes bibliographical references (p. 105). Also Available online.
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Iu, Lai-ling. "Slope mainteannce [i.e. maintenance] and repair works in Hong Kong." Click to view the E-thesis via HKU Scholars Hub, 2005. http://lookup.lib.hku.hk/lookup/bib/B37935392.
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Aman, Shah Shahani. "System level airborne avionics prognostics for maintenance, repair and overhaul." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/11844.
Full textAbstract:
The aim of this study is to propose an alternative approach in prognostics for
airborne avionics system in order to enhance maintenance process and aircraft
availability. The objectives are to analyse the dependency of avionic systems
for fault propagation behaviour degradation, research and develop methods to
predict the remaining useful life of avionics Line Replaceable Units (LRU),
research and develop methods to evaluate and predict the degradation
performances of avionic systems, and lastly to develop software simulation
systems to evaluate methods developed.
One of the many stakeholders in the aircraft lifecycle includes the Maintenance,
Repair and Overhaul (MRO) industry. The predictable logistics process to some
degree as an outcome of IVHM gives benefit to the MRO industry.
In this thesis, a new integrated numerical methodology called ‘System Level
Airborne Avionic Prognostics’ or SLAAP is developed; looking at a top level
solution in prognostics. Overall, this research consists of two main elements.
One is to thoroughly understand and analyse data that could be utilised.
Secondly, is to apply the developed methodology using the enhanced
prognostic methodology.
Readily available fault tree data is used to analyse the dependencies of each
component within the LRUs, and performance were simulated using the linear
Markov Model to estimate the time to failure. A hybrid approach prognostics
model is then integrated with the prognostics measures that include
environmental factors that contribute to the failure of a system, such as
temperature. This research attempts to use data that is closest to the data
available in the maintenance repair and overhaul industry.
Based on a case study on Enhanced Ground Proximity Warning System
(EGPWS), the prognostics methodology developed showed a sufficiently close
approximation to the Mean Time Before Failure (MTBF) data supplied by the Original Equipment Manufacturer (OEM). This validation gives confidence that
the proposed methodology will achieve its objectives and it should be further
developed for use in the systems design process.
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Lia, Debora. "Role of alphaOGG1 in the Maintenance of Mitochondrial Physiology." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS125/document.
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Les mitochondries sont des structures uniques dans la cellule mammifère. Ces organites portent leur propre génome (ADN mitochondrial, ADNmt) qui se compose d'une petite molécule qui codifie pour 13 polypeptides de la chaîne de transport d'électrons (ETC), 22 ARNt et 2 gènes d'ARNr pour sa propre synthèse protéique. Le MTDNA est proposé pour être plus susceptible au stress oxydatif que le génome nucléaire (ADNn) parce que non seulement il manque d'histones protectrices, mais aussi en raison de sa proximité avec les complexes ETC qui sont les principaux producteurs de ROS dans les cellules de mammifères. Parmi tous les types de dommages à l'ADNmt, les dommages oxydatifs sont les plus répandus et, de loin, les mieux étudiés. La voie de réparation de l'excision de base (BER) est un mécanisme de réparation d'ADN conservé de façon évolutive qui répare les dommages de base d'ADN non volumineux. Puisque la guanine a le potentiel redox le plus bas de toute autre base dans l'ADN, elle est facilement oxydée à la 8-oxoguanine (8-oxoG) qui est l’altération la plus fréquente induite par les ROS sur les deux, l'ADNc et l'ADNmt. Si la fourche de réplication contourne le 8-oxoG avant son élimination, un A est souvent inséré sur le brin d'ADN opposé et les réplications subséquentes corrigent la transversion de G à T. Lorsqu'il est associé à la cytosine, le 8-oxoG est éliminé de l'ADN par l'ADN glycosylase de 8-oxoguanine (OGG1) qui, de cette manière, initie le procédé BER. OGG1 est une glycosylase de ménage bi fonctionnelle qui, conjointement avec d'autres enzymes BER différentes, est présente dans les compartiments nucléaires et mitochondriaux, soulignant l'importance de maintenir l'intégrité de l'ADNmt pour le fonctionnement cellulaire normal. Il a été démontré que la surexpression d'une version recombinante d'OGG1, spécifiquement destinée aux mitochondries par un signal de ciblage mitochondrial supplémentaire (MTS) (OGG1-MTS), protège les cellules d'un stress oxydatif, probablement en raison d'une efficacité accrue dans la réparation De 8-oxoG dans l'ADNmt. L'objectif principal de notre projet est d'élucider si la perte spécifique de l'activité de réparation 8-oxoG dans les mitochondries (mais pas dans le compartiment nucléaire) a un impact sur les fonctions organelles et / ou sur la viabilité cellulaire et aussi pour dévoiler le mécanisme / s Derrière les effets protecteurs d'OGG1 sur la physiologie mitochondriale et la maintenance d'ADNmtMitochondria are unique structures within the mammalian cell. These organelles carry their own genome (mitochondrial DNA, mtDNA) which consists of a small molecule that codifies for 13 polypeptides of the electron transport chain (ETC), 22 tRNA and 2 rRNA genes for its own protein synthesis. MtDNA is proposed to be more susceptible to oxidative stress than the nuclear genome (nDNA) because not only it lacks protective histones but also because of its proximity to ETC complexes which are the main ROS producers in mammalian cells. Among all the types of mtDNA damage, oxidative damage is the most prevalent and, by far, the best studied. Base excision repair (BER) pathway is an evolutionarily conserved DNA repair mechanism that repairs non-bulky DNA base damages. Since guanine has the lowest redox potential of any other bases in DNA, it is readily oxidized to 8-oxoguanine (8-oxoG) that is the most frequent alteration induced by ROS on both, nDNA and mtDNA. If the replication fork bypasses the 8-oxoG before its removal, an A is often inserted on the opposite DNA strand and subsequent replications fix the G to T transversion. When paired with cytosine, 8-oxoG is removed from DNA by the 8-oxoguanine DNA glycosylase (OGG1) that in such a way initiates the BER process. OGG1 is a bifunctional housekeeping glycosylase that, together with other various BER enzymes is present in both nuclear and mitochondrial compartments, highlighting the importance of maintaining mtDNA integrity for normal cellular functioning. It has been demonstrated that the overexpression of a recombinant version of OGG1, specifically targeted to mitochondria by an additional Mitochondrial Targeting Signal (MTS) (OGG1-MTS), protects the cells from an oxidative stress, likely due to an increased efficiency in the repair of 8-oxoG in mtDNA. The main goal of our project is to elucidate if the specific loss of 8-oxoG repair activity in mitochondria (but not in nuclear compartment) has an impact on the organelles’ functions and/or on cell viability and also to unveil the mechanism/s behind the protective effects of OGG1 on mitochondrial physiology and mtDNA maintenance
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Murphy, Brian P. (Brian Patrick) 1963. "Applying lean manufacturing initiatives to naval ship repair centers : implementation and lessons learned." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33433.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2004.Includes bibliographical references (p. 58).
The United States Navy is under pressure to reduce the cost of fleet maintenance in order to redirect funds for the construction of new ships and submarines. The Navy looks to private industry for process improvement ideas such as the Theory of Constraints, Six Sigma and Lean Manufacturing Principles. This thesis examines the Lean Manufacturing movement in the private sector of ship repair and how it eventually came to government owned ship repair operations. Recent National Ship Research Program (NSRP) initiatives provide shipyards a strategy of how to select areas of an operation for Lean improvements. The Norfolk Naval Shipyard method is a combination of the Theory of Constraints, Six Sigma and Lean Principles called Lean Sigma. The Lean Sigma methodology for planning, executing and sustaining lean improvement and how to measure success with various metrics is presented. Lean Sigma is implemented into the Electric Motor Rewind and Repair Center as a case study. Before and after assessments, lessons learned, and recommendations from the implementation case study are presented.
(cont.) Details of the challenges and pitfalls encountered during the Lean Sigma implementation in the areas of culture, budget, management, metrics and cost benefit measurement, are described throughout the test case. In conclusions key elements for successful Lean transformation and a vision for the future Lean Ship Repair Enterprise are presented.
by Brian P. Murphy.
S.M.
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Yearby, Shedrick Dashun. "USMC Aviation Maintenance and Repair Cost for the H-1 Upgrade." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/6891.
Full textAbstract:
MBA Professional ReportApproved for public release, distribution unlimited
This research focuses on the Marine Corps Aviation Maintenance and Repair Cost for the H-1 Upgrade platform. Onsite visits with the Program Manager Air 276 (PMA-276), the Naval Supply Weapons Systems Support (NAVSUP WSS), the Defense Logistics Agency (DLA), and Marine Aviation Logistics Squadron 39 (MALS-39) are conducted to obtain information regarding readiness costs and efficiencies that have impacted the total cost for a transitioning aircraft in Marine aviation. PMA-276, NAVSUP WSS, DLA, and MALS-39 make up the H-1 Cross-Functional Team (CFT). The H-1 CFT provides actionable metrics and best practices that focus on cost concerns (programmatic, material, management, and execution) from all levels of aviation logistics and planning. Key areas of improvement or replication are identified through metric-based solutions that affect cost reductions throughout the AH-1Z and UH-1Y integration.
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Wood, Thomas L. "Evaluation of project selection techniques for pavement network maintenance and repair." Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/25909.
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Different approaches have been suggested for determining the optimal
mix of repair projects for a pavement network. These methods range from
random selection to sophisticated mathematical optimization models.
This paper presents an analysis of several questions regarding the
effectiveness of three possible selection methods.
First, the performance of three separate single year project selection
methods on different size networks is assessed over a broad funding spectrum.
The results indicate that as funding levels increase, the benefit obtained by
different selection methods converge. In addition, as the size of the network
increases, the convergence tends to occur at progressively lower funding levels.
Second, the effect of the performance prediction models on these same
selection methods is assessed by altering the coefficients of the models to predict both faster and slower deterioration of the network. The "select sets" of
projects created by priority ranking selection and Knapsack IP selection at three
separate funding levels are compared to determine how much variation is introduced by the changes in the performance prediction. With a 30%
acceleration and deceleration of the deterioration curves, there was little change
in the optimal project set created by either method.
Finally, a modified Monte Carlo model is used to assess the general
shape of the solution space. The results suggest that the solution space is relatively flat except in the immediate vicinity of the optimum. This, in turn,
suggests that a Monte Carlo approach to this problem would require a large
number of trials to approximate the optimum. This finding conceptually supports
findings in this study and others, as well as the intuitive observation, that random
maintenance and repair strategies perform poorly compared to more rational
approaches. Since only a few sets of repair projects are near the optimum, the
chances of a random selection matching one of these near optimal project sets are relatively small.
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Coxon, W. D. "Evaluation of models for decision making in inspection and repair maintenance." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/21151.
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There has been growth in the costs of maintenance over the last 40 years. This can be linked directly to the changes in production technology over that period of time. However. there has also been growth in the field of management science and operations research. Many models have been developed to assist the maintenance function in its decisions. However. it would appear from engineering journals and shop floor practice that these models are not well used. For this research the method of inspection and repair maintenance has been chosen. Mainly because it is one of the most widely used methods. The objectives of the research are as follows: (1) To investigate the state of the art of plant and equipment maintenance paying particular attention to the inspection and repair policy. (2) To establish what basic models are available for decision making in inspection and repair maintenance. (3) To establish how feasible and useful each of these models is in the practical engineering environment. (4) To consider factors in the implementation of a decision making model in the inspection and repair policy with particular reference to the most practical and feasible model investigated.
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Konda, Issa 1962. "Tractor repair and maintenance costs and management policies in Burkina Faso." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277842.
Full textAbstract:
Farm machinery management data were collected in Burkina Faso, for the prediction of repair and maintenance costs. Equations were developed to predict repair and maintenance costs of tractors, cane loaders, generators and motorpumps. The analysis of data revealed that tractor repair and maintenance appears a greater burden than predicted by the American and Australian data. Tractor trade-in was not prescribed by the rule of minimum total cost per unit tractor use. Farm machinery and power units were operated more than twice as long as in the United States. New machine purchase was discouraged by the current sugar prices on the local market.
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Toledo, Maria Luiza Guerra de. "Determination of the optimal periodic maintenance policy under imperfect repair assumption." Universidade Federal de Minas Gerais, 2014. http://hdl.handle.net/1843/BUOS-9KRG8A.
Full textAbstract:
An appropriate maintenance policy is essential to reduce expenses and risks related to repairable systems failures. The usual assumptions of minimal or perfect repair at failures are not suitable for many real systems, requiring the application of Imperfect Repair models. In this work, the classes Arithmetic Reduction of Age and Arithmetic Reduction of Intensity, proposed by Doyen and Gaudoin (2004) are explored. Likelihood functions for such models are derived, and the parameters are estimated, allowing to compute reliability indicators to forecast the future behavior of the failure process. Under the classic Imperfect Repair virtual age model presented by Kijima et al. (1988) (particular case of Aithmetic Reduction of Age class), a periodic Preventive Maintenance policy is proposed, which estimates optimal time intervals for Preventive Maintenance, in order to minimize (preventive and corrective) maintenance costs. Under a dynamic perspective, it is showed how this policy can be improved, using each failure observation in order to recalculate the optimal time to Preventive Maintenance for a particular system, considering the effect of the repair action. These policies are applicable to any Imperfect Repair model. Monte Carlo simulation studies are implemented in order to evaluate the performance of the proposed methods. Those methods are applied to a real situation regarding the maintenance of engines of off-road trucks used in a mining company. These results bring valuable information to support decision making regarding Preventive Maintenance policy..
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Peterson, Reginald E. "Exploring Customers' Perceptions of Third Party Maintenance, Repair, and Operating Programs." ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/2170.
Full textAbstract:
A survey of 25 industrial manufacturing organizations in the U. S. indicated that 70% of respondents experienced dissatisfaction with their outsourcing programs due to unfulfilled expectations, which caused negative continuance intentions. The purpose of this descriptive case study was to explore the experiences of customers who currently use 3PMRO outsourcing programs to determine what factors affect satisfaction levels in the Southern United States. The conceptual framework for this study was the expectancy disconfirmation paradigm, which connects consumer satisfaction level to the fulfillment of consumer expectations. Data were collected from interviews of 22 procurement professionals of maintenance, repair, and operating supplies; observations of 3PMRO supplier performance meetings; and the analysis of performance scorecard documents. Data were analyzed using pattern matching followed by thematic analysis. Three themes were identified through the data analysis that affected consumer satisfaction: inventory management services, utilization of outsourced labor resources, and total cost value of the 3PMRO program. According to results, satisfaction of 3PMRO consumers are based on the proper utilization of a 3PMRO program for the intended limitations of the organization, reduced MRO supply costs, improved inventory management strategies, and improved competitive advantage from the realignment of resources to focus on core competencies. Implications for positive social change include increased awareness of cradle-to-grave inventory management to prevent improper disposal of non-biodegradable materials into our environment.
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Barnhart, Cynthia. "Investigation of need for organized maintenance." Virtual Press, 1986. http://liblink.bsu.edu/uhtbin/catkey/450777.
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The benefits of maintenance have been known for centuries, and throughout history these benefits have been the basis for much discussion. Recently such benefits have been formally proposed in terms of scheduled or cyclical maintenance programs. These programs have been developed for important historic buildings; yet the same benefits can be applied to any house. This concept is the basis of this thesis.The thesis begins with a discussion of the obvious need for some maintenance program and describes the recent interest of local governments in some form of maintenance planning, discussing the benefits of an organized approach to maintenance. Next it briefly reviews the beginnings and history of maintenance theories and is followed by a discussion of maintenance as a level of conservation of building. Basic statistics about homeowners and the development of the survey are addressed, which leads to the presentation of compiled results of the survey and a interpretation of the data. The conclusion indicates a direction for the development of an organized maintenance plan.
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Proulx, Daniel J. "The principal problems with the administration of service contracts at a ship repair facility." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26710.
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Haddad, Fadi M. "Maintenance in a contractor organization:a practical approach." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44641.
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A model for optimizing the assignment of maintenance actions for a piece of equipment
is developed in the thesis. The model considers the detectability and the criticality of
component failure in order to assign a maintenance instruction. The thesis also develops
the framework for an integrated maintenance management system. The system consists
of three modules. The first module is work control. It is used to prepare, schedule, and
insure the execution of maintenance instructions. The second module is the equipment
condition control module which monitors maintenance effectiveness and accordingly
updates the maintenance instructions. The third module is cost control. This is the tool
used to monitor the economical performance of the maintenance function. An equipment
information system is also presented, and two futuristic maintenance proposals are
introduced.
The model and the integrated maintenance management system, constitute a strong tool,
that equipment managers can use to optimize the maintenance function, and improve
the mechanical, operational, and economical performance of equipment.
Master of Science
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Gunderson, David W. "Surface ship Shore Intermediate Maintenance Activity costs under Defense Business Operations Fund regulations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA311893.
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Lee, Sung Keun. "Modelling the reliability of critical ship equipment subject to at sea inspection maintenance." Thesis, University of Salford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335556.
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Blyden, Gregory D. "Modeling ship air conditioning maintenance costs using the Integrated Condition Assessment System (ICAS)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FBlyden.pdf.
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Limbachiya, Mukeshchandra K. "Assessment of the long term performance of repaired reinforced concrete." Thesis, Sheffield Hallam University, 1995. http://shura.shu.ac.uk/19962/.
Full textAbstract:
Rational decisions about cost-effective maintenance and structural repair are hampered by the absence of comprehensive data on structural performance of generic repair materials acting compositely with deteriorated concrete elements. In the present climate of durability problems in concrete construction such information is of critical importance. In order to assess long-term structural performance of repaired elements, basic short and long-term properties of generic repair materials are required under various exposure conditions. The principle requirements to ensure satisfactory long-term performance of the repair have always been high dimensional stability and relatively high early bond strength of the repair material with the substrate concrete. As part of a "Brite Euram" project, sponsored by E.E.C., the author has obtained considerable experimental data on properties of three commercially available generic repair materials, which are significant to the subsequent structural behaviour of repaired concrete members. A comparison is also made between the performance of these repair materials with a plain concrete mix of similar strength and stiffness. The following generic repair materials were used: a high performance non-shrinkable concrete, a mineral based cementitious material with no additives and no coarse aggregate size particles, and a cementitious mortar which contains styrene acrylic copolymer with fibre additives. The repair materials are supplied as single component systems by their manufacturers, ready for on-site mixing and use, and require only the addition of clean water. Data on strength, stiffness, post peak-load ductility under compression, swelling, shrinkage and creep deformations under various curing conditions are presented in this thesis. In addition water permeability coefficients and chloride penetration profiles of the materials at various ages of exposure have been determined. A comprehensive compilation of chloride diffusion data is made and an empirical expression is derived for the prediction of long-term chloride penetration profiles based on data obtained at relatively early ages. Application of this prediction model to the field data of some Arabian Gulf structures is made. The influence of repair materials on the performance of reinforced concrete compression members has been studied. A theoretical model is also derived to predict the long-term structural interaction between a repair patch and substrate concrete in short compression members of reinforced concrete. The model is based on the basic properties of materials, such as creep deformation, drying shrinkage and modulus of elasticity. The validity of the model is established on the basis of the experimental data obtained in this study. At the end of the thesis, conclusions and recommendations for future research are made.
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Graszi, Nassib Nadim, and M. Zenkin. "Optimization of car operation and repair processes with use of remote electronic diagnostic systems." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/14598.
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Grabovac, Ivan, and ivan grabovac@dsto defence gov au. "Composite Reinforcement for Naval Ships: Concept Design, Analysis and Demonstration." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070209.151724.
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This thesis outlines the development of composite reinforcement technology for a ship's aluminium alloy superstructure. The work objective aimed to alleviate stress concentration in parts of the superstructure prone to fatigue-induced cracking. This is a novel approach to ship repair, which promises reduction in the cost of maintenance primarily due to greater efficiency and lower cost of repair. The work was conducted over approximately 12 years. It commenced in the late 80s with laboratory research and development and concluded in 2000 after completion of a seven-year trial on board a navy ship. Two carbon fibre composites, (5 m x 1 m consisting of a 25-ply laminate), were adhesively bonded to the 02-deck on the port and starboard sides. It was found that upgrading the structure using composites was effective, making it able to withstand service fatigue stresses. Finite element modelling and strain measurements on board the ship showed that critical stress concentration could be alleviated through stress redistribution. For the duration of the trial, no cracking of aluminium alloy deck in the vicinity of the reinforcements was reported. Both composite reinforcements exhibited good performance and remained in service after the end of the trial. However, the marine environment did cause some non-structural, edge debonding of the glass fibre reinforced overlay at the composite-metal interface. This overlay was designed to provide surface protection to the underlaying carbon reinforcement. Bond degradation was patchy. It occurred after about three years in service, most probably due to a combination of thermal cycling (solar heating/cooling) and water ingress at the interface. A new edge sealing method restored its durability and it required no further attention. This experiment was successfully demonstrated on board an active navy ship. The work proved that an effective and durable repair of a ship structure using non-metallic repair technology is feasible. Composite reinforcements prevented deck cracking and removed any need for welded repairs, thereby reducing the cost of ship maintenance. For further cost reduction it is recommended to adopt the principle of reverse engineering to simplify the technology for dockyard use.
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Mahmood, Asif. "Maintenance and repair of gastrointestinal mucosa using recombinant peptides and natural products." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443960.
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