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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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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.
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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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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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Knight, Amanda J. (Amanda Joann). "Next generation commercial aircraft engine maintenance, repair, and overhaul capacity planning and gap analysis." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117979.
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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, in conjunction with the Leaders for Global Operations Program at MIT, 2018.Thesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, in conjunction with the Leaders for Global Operations Program at MIT, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 73-74).
A critical element in maintaining engine safety and in providing post-production service and support of a commercial aircraft engine is the complete worldwide network of maintenance, repair, and overhaul facilities. Matching forecasted shop visit demand to network-wide capacity is essential to ensuring the required resources are in place to quickly repair and return these assets to the airline customer. A capacity analysis methodology is developed to characterize and analyze the current network capacity for the PW1100G Geared Turbofan engine model for Gate 3 Engine Testing processes. This capacity model is then compared to the anticipated monthly shop visit demand for engine repair services through 2026. By identifying capacity shortages earlier in the program, Pratt & Whitney can proactively plan for and fund additional resources to improve capacity, ensuring the required capacity is in place when demand materializes to reduce shop visit delays. The results of the PW1100G capacity study are utilized both to provide recommendations for the anticipated timeframe when additional resources will be required to meet projected demand and to outline major planning milestones required to meet the resource need date.
by Amanda J. Knight.
M.B.A.
S.M.
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Roque, Luiz Gabriel Rossi. "Gestão de portfólio de serviços de MRO (Maintenance, Repair and Overhaul) aeronáutico: uma pesquisa ação." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18156/tde-15012013-094115/.
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Os centros de manutenção de aeronaves da América Latina possuem portfólios de serviços limitados e esse é um fator que restringe o crescimento do transporte aéreo na região. Faz-se necessário, portanto, o desenvolvimento de novos serviços de reparo de aeronaves e seus componentes nesses centros. Apesar de o Desenvolvimento de Produtos ter recebido uma atenção substancial na ultima década, há pouca literatura sobre o Desenvolvimento de Serviços e trabalhos que tratam de gestão de portfólio de serviços são ainda mais escassos. A pouca literatura existente não é suficientemente abrangente para tratar da gestão de portfólio de serviços de manutenção complexa. O objetivo deste trabalho é, portanto, desenvolver um processo de gestão de portfólio de serviços para empresas de manutenção aeronáutica, chamado de modelo específico. O desenvolvimento do modelo será feito utilizando a pesquisa-ação, abordagem que objetiva tanto a tomada de ação quanto a criação de conhecimento com ciclos contínuos. Durante a criação do modelo específico foram usados como base de conhecimento modelos de referência de PDP e PDS, posteriormente adaptados para a realidade de serviços, para a região e tipologia da indústria. A pesquisa ação se iniciou numa pré-fase de contextualização, seguida por quatro ciclos, sendo que em cada ciclo uma etapa do modelo foi desenvolvida e avaliada, resultando em um modelo especifico de gestão de portfólio para indústria de MRO aeronáutico brasileiro. Ao final dos ciclos foi feita uma avaliação do processo criada por meio de um questionário. Os participantes da pesquisa avaliaram o método de desenvolvimento do modelo como adequado e avaliaram também o próprio modelo como adequado.The aircraft maintenance centers in Latin America have limited portfolios of services; this is a factor that restricts the growth of air transport in the region. Therefore is necessary to develop new maintenance, repair and overhaul (MRO) services for aircraft and their components in those centers. New Product Development (NPD) process theory has received substantial attention in the last decade but there is little literature on the New Services Development (NSD), and papers dealing directly with services portfolio management are even scarcer. The existing literature is not holistic enough to deal with maintenance services portfolio management. Therefore this paper aims to develop a services portfolio management (SPM) for aircraft components maintenance. The SPM model development will be done using the action research approach trough the creation of knowledge in continuous PDCA cycles. During the creation of the specific model, were used as knowledge base reference models of PDP and PDS, later adapted to the reality of services to the region and type of industry. The action research began in pre contextualization phase, followed by four cycles, and each cycle a stage of the model was developed and evaluated, resulting in a specific model of portfolio management for MRO Brazilian aeronautics industry. At the end of cycles an evaluation process created by means of a questionnaire. Survey participants rated the method as proper development of the model, the model itself also rated as adequate.
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Ayeni, P. "Enhancing competitive advantage through successful lean realisation within the aviation Maintenance Repair and Overhaul (MRO) industry." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/11317.
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Purpose: Lean is increasingly being applied within the aviation Maintenance and Repair (MRO) Industry to mitigate industry challenges. This Lean application is premised on its success within other industrial contexts particularly the automotive industry. Furthermore, many organisations within automotive industry have attributed their enhanced competitive positioning to the Lean application. Indeed, Toyota (a pioneer of Lean) present Lean as a key proponent to its global success. However, with literature suggesting that there cannot be a direct transference of Lean from one industry to another and with the MRO having distinct characteristics different from the automotive industry, this research seeks to present how competitive advantage can be achieved through successful Lean realisation. Design/Methodology/Approach: The status of MRO Lean engagements presented is first presented based on the syntheses of literature review and empirical study (facilitate by an industry-wide survey). The means through which the MRO realises its value proposition is established and the structural assessment of the MRO industry as it pertains to competitiveness is also defined. The role of Lean in enhancing the value delivery system to enhance competitive positioning is operationalised through a case study. Findings: Using Porter’s forces of competition, this research establishes the competitive MRO landscape revealing the distinct characteristics of the MRO industry and how Lean can be accurately appropriated to enhance competitive advantage. The MRO Value Delivery System (VDS) is also delineated providing the complete system within which Lean is to be deployed (as opposed to the prevalent limited application of Lean in operational context alone). The case exemplar successfully validates and operationalises the approach to Lean application within MRO to enhance competitive advantage. Research Limitations: A case study example was used for this research, and whilst the outcomes were consistent with the research proposal, it still requires wider validation. Practical and Social Implications: This research demystifies and helps MRO organisations in assessing their Lean engagements but also in provide a roadmap and informs their strategy in improving their competitive status through Lean realisation.
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Patterson, Lester O., and Bardford C. Tonder. "External strategic analysis of the aviation maintenance, repair and overhaul (MRO) industry and potential market opportunities for Fleet Readiness Center Southwest." Monterey, California. Naval Postgraduate School, 2009. http://hdl.handle.net/10945/10444.
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MBA Professional ReportApproved for public release, distribution unlimited
The purpose of this MBA professional report is to supplement the long and short range strategic development efforts of Fleet Readiness Center Southwest (FRCSW) by providing command leadership with an analysis of the current aviation maintenance, repair, and overhaul (MRO) industry to identify potential expansion opportunities for FRCSW. Strategy development is dependent upon a solid, current and complete industrial analysis. An industrial analysis includes, 1) a definition of the industry, 2) a description of external forces acting upon the industry, 3) a description of the industry structure and 4) an examination of the key success factors that benchmark the requirements for a firm to stay competitive in the industry. These analyses provide FRCSW with the information required to leverage their core competencies to indentify and capitalize on potential opportunities in the industry. This study identifies emerging trends, presents projected forecasts, identifies external forces on both the military aviation MRO industry and FRCSW, and discusses those factors that are key to long term success in the military aviation MRO industry. The conclusions present a number of opportunities for FRCSW to explore in their effort to remain the Navy's premier aviation depot.
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Patterson, Lester O. Tonder Bardford C. "External strategic analysis of the aviation maintenance, repair and overhaul (MRO) industry and potential market opportunities for Fleet Readiness Center Southwest." Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/MBAPR/2009/Jun/09Jun%5FPatterson%5FMBA.pdf.
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"Submitted in partial fulfillment of the requirements for the degree of Master of Business Administration from the Naval Postgraduate School, June 2009."Advisor(s): D'Addea Jones, Becky ; Euske, Ken J. "June 2009." "MBA professional report"--Cover. Description based on title screen as viewed on July 14, 2009. Author(s) subject terms: Fleet Readiness Center, Aviation Maintenance Repair and Overhaul, MRO, Aviation enterprise, Military Depots, Aviation Maintenance, FRCSW, NADEP Includes bibliographical references (p. 61-68). Also available in print.
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Wojtak, P. "The impact of horizontal mergers and acquisitions on supply chain management : the case of the industrial maintenance, repair and overhaul distribution sector." Thesis, University of Salford, 2018. http://usir.salford.ac.uk/47998/.
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A great majority of commercial businesses plan to or, at least, desire to grow and expand their operations, enter new markets, obtain new technologies, and find new customers. These goals can be achieved in an organic way through slow expansion, steady project investment, gradual growth of sales, investment in R&D (research and development), etc. Another way, one that is much quicker and that can offer instantaneous growth, is through mergers with or acquisitions of (M&As) other businesses. If all goes well, M&A deals can reward numerous stakeholders, including institutional and individual shareholders, suppliers, customers as well as employees. Mergers and acquisitions can drive company growth enormously, multiplying turnover just in a matter of years. The rewards are very promising. On the flip side, however, many M&A initiatives either fail or do not deliver initially set objectives, as will be discussed later in the study. In the last two decades, numerous authors have researched the M&A area, often in an attempt to understand barriers to and enablers of successful merger and acquisition deal completion and realisation. These authors have looked into various aspects of the M&A process, including human resource management and customer management, sales channels integration, and have diligently scrutinised the financial and strategic characteristics of M&A deals. Surprisingly, despite the abundance of research and knowledge, the M&A completion success rate has not been improving by any significant measure, yet this has not discouraged organisations from pursuing these, as is now known, high risk growth strategies. In this research the author is looking at supply chains of businesses concerned with the subject of mergers and acquisitions. Organisations may either be conducting an acquisition, or becoming acquired by somebody else, or may be merging with another business. Thorough consideration is given to the pre-acquisition or pre-merger stage of the process, as well as to post-acquisition or post-merger supply chain practices and integration. The author believes that skilful supply chain management, including the integration of merging supply chains, can help to improve the chances of successful M&A deal completion through the enabling of full potential realisation within the shortest possible time. What is more, to date, very limited research has been carried out on the subject, and so there is a direct need for the study.
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Wirths, Oliver [Verfasser], Werner [Gutachter] Delfmann, Werner [Gutachter] Reinartz, and Martin [Gutachter] Fritze. "Business Model Innovation in the Aerospace Industry: Strategic Options for Maintenance, Repair, and Overhaul Firms / Oliver Wirths ; Gutachter: Werner Delfmann, Werner Reinartz, Martin Fritze." Köln : Universitäts- und Stadtbibliothek Köln, 2019. http://d-nb.info/1199537284/34.
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Jenvald, Mattias, and Mikael Hovmöller. "Reducing Delays for Unplanned Maintenance of Service Parts in MRO Workshops : A case study at an aerospace and defence company." Thesis, Linköpings universitet, Produktionsekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-167203.
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Service parts sometimes break down unexpectedly and require maintenance. The irregular nature of the need for this type of maintenance makes forecasting difficult and unreliable. Saab currently experiences problems with long delays when performing unplanned maintenance of service parts used in the two models of Gripen aircraft, Gripen C and Gripen D. These delays are source of monetary waste, as late delivery of maintained service parts results in Saab having to pay penalty fines to the customers. The purpose of this master thesis was to analyze data collected during a case study at Saab in Linköping, and suggest improvements for how to reduce these delays. This study focused on analyzing what caused the delays, and how the information provided by the customers can be used by the operative planners at the Maintenance, Repair \& Overhaul (MRO) workshops in order to be more efficient. The data was collected during the case study using semi-structured interviews of 16 people working with the current system, as well as by collecting historical data from an internal database at Saab. This data was analyzed in parallel with a literature study of relevant research related to service parts supply chains, MRO workshops, and unplanned maintenance operations. The analysis showed that there were four types of interruptions of maintenance; Internal stock-out of spare parts, internal stock-out of sub-units, external delays at the Original Equipment Manufacturer (OEM), and internal equipment breakdowns. A root cause analysis found that the four root causes of delays were: Saab does not have any contracts that incentivizes their OEM's to deliver on time. The data from the technical report is not used to provide the operative planners with information about incoming orders. The MRO workshops do not have a standardized system for prioritizing maintenance of service parts. The MRO workshops currently lacks a method for predicting certain types of machine breakdowns.
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BELL, RUBEN LIONEL. "A STUDY OF WORKLOAD SCHEDULING AND RESOURCE PLANNING AT AN OVERHAUL FACILITY." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin975507800.
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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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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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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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Fowler, John C. "A review of factors affecting the acceleration of aerospace repair and overhaul processes in emergency or war." Thesis, University of Manchester, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632816.
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Since 1990 the Royal Air Force has suffered many airbase closures and sharp reductions in aircraft numbers; balanced by more than commensurate falls in spare-part holdings and support facilities. The Service has also been affected by fundamental organisational changes and by severe cuts in Service manpower, especially in logistics trades. Concurrently, annual support budgets have been restricted while operational commitments have grown more uncertain and demanding. Indeed, apart from sustaining a demanding flying effort with reduced resources, RAF logistics staff must now plan to support many rapid deployments and concurrent intensive operations from uncertain locations. This thesis examines factors leading up to the current state of affairs, concentrating on the combined impact of radical stockholding philosophies and new management stnlctures. Concurrent change throughout the aerospace industrial sector which repairs and overhauls many of the Service's most critical assets will also be examined. The text then evaluates current operational commitments from a stockholding and contracting perspective before assessing their most likely impact on existing repair chains. The study evaluates the current state of repair facilities at airbase, depot and industrial levels to assess their overall potential for timely expansion. It then develops and critically analyses various alternate support options which may also serve to minimise the impact of stock shortages on operational effectiveness. Drawing on the combined findings of a survey of over 400 current RAF repair contracts and several complementary surveys, the study examines common features within current industrial repair processes. It then highlights procedural, contractual and corporate factors which now stand to hinder any acceleration of repair output in times of crisis. The work also assesses a number of present initiatives to improve repair processes and to concentrate planning around emergency rather than routine requirements. This unique and far-ranging work closes with an assessment of modern mathematical modelling techniques, areas for further study, overall conclusions and recommendations.
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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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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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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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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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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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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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Sanchez, Hernando Alejandro 1970. "A case study in application of robust design methods to waterjet processes in overhaul and repair of jet engine components." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9754.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, February 1999.Includes bibliographical references (leaves 92-93).
The North Berwick Engine Services (NBES) Business Unit at the Pratt & Whitney (PW) facility in North Berwick, Maine has identified the need to develop new for cleaning/stripping parts in the overhaul and repair cycle of jet engine components. I investigate the issues that must be answered for the introduction of a new cleaning technique. The new method uses a waterjet in place of a wet abrasive blast using a novaculite slurry solution. The process used to develop high-pressure waterjet cleaning procedures was based on Robust Design methodology. Robust Design uses orthogonal arrays which allow a large number of variables to be studied with a small number of experiments. This requires selection of key input factors that affect the output characteristics of the product. A set of experiments with seven control factors were run in order to determine the response to two quality characteristics: material erosion and increase in surface roughness. Optimum settings for each one of these seven control factors were established. A verification experiment was run in order to validate predictions made based on the optimum settings. It is estimated that this new cleaning method will yield $1,730,000 of savings over the next five years, eliminate four hours of labor per part, and increase production capacity by two additional person-years.
by Hernando Alejandro Sanchez.
S.M.
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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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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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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.
Full textAbstract:
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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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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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.
Full textAbstract:
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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Barnhart, Cynthia. "Investigation of need for organized maintenance." Virtual Press, 1986. http://liblink.bsu.edu/uhtbin/catkey/450777.
Full textAbstract:
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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Haddad, Fadi M. "Maintenance in a contractor organization:a practical approach." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44641.
Full textAbstract:
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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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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Karim, Hawzheen. "Improved Road Design for Future Maintenance - Analysis of Road Barrier Repair Costs." Licentiate thesis, Stockholm : Division of Highway Engineering, Royal Institute of Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9260.
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Supawiwat, Nutthapon. "A study on road slope management system considering maintenance and repair strategy." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144540.
Full textAbstract:
Kyoto University (京都大学)0048
新制・課程博士
博士(工学)
甲第11867号
工博第2560号
新制||工||1358(附属図書館)
23647
UT51-2005-N701
京都大学大学院工学研究科土木システム工学専攻
(主査)教授 大西 有三, 教授 大津 宏康, 教授 中北 英一
学位規則第4条第1項該当
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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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Burger, A. F. (Adriaan Francois). "Scheduling algorithms for routine maintenance of roads in maintenance wards of a gravel road network." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50446.
Full textAbstract:
Thesis (MScEng)--University of Stellenbosch, 2005.ENGLISH ABSTRACT: The study reported in this thesis focuses on the development of algorithms that can be used to schedule routine maintenance work in maintenance wards of a gravel road network, This was undertaken as part of the development of the Blading Optimisation Module of the Gravel Management System of the Provincial Government: Western Cape. Two scheduling algorithms were developed and mapped to a pilot object model on the computer. The algorithms and application interface takes account of the constraints and variables of routine maintenance that were identified through interviews with personnel of the five District Municipalities contained in the Western Cape. The algorithms are tested and evaluated using the pilot application. Based on the evaluation of the algorithms conclusions are drawn and recommendations are made.
AFRIKAANSE OPSOMMING: Die studie beskryf in hierdie tesis fokus op die ontwikkeling van algoritmes vir die skedulering van roetine instandhoudingswerk in instandhoudingswyke van 'n gruispadnetwerk. Dit is ondemeem tydens die ontwikkeling van die "Blading Optimisation Module" van die "Gravel Management System" van die Provinsiale Regering: Wes Kaap. Twee algoritmes is ontwikkel en afgebeeld op 'n loods-objekmodel op die rekenaar. Die algoritmes en toepassingskoppelvlak maak voorsiening vir die beperkings en veranderlikes wat geidentifiseer is tydens onderhoude met personeel van die distrikmunisipaliteite in die Wes Kaap. Die algoritmes is getoets en geevalueer met behulp van die loodstoepassing. Gevolgtrekkings en aanbevelings word gemaak op grond van die resultate van die evaluasie van die algoritmes.
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Rasmekomen, Nipat. "Condition-based maintenance for multi-component systems with degradation interactions." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709026.
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Soldon, Brian T. "The International Space Station comparative maintenance analysis model (CMAM)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FSoldon.pdf.
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Dao, Cuong D., and M. J. Zuo. "Selective maintenance for multi-state systems considering the benefits of repairing multiple components simultaneously." Springer, 2014. http://hdl.handle.net/10454/17980.
Full textAbstract:
NoMany industrial systems such as aircrafts, ships, manufacturing systems, etc. are required to perform several missions with finite breaks between missions. Maintenance is only available within the breaks. Due to the limitation of resources, all components in the system may not be maintained as desired. The selective maintenance problem helps the decision makers figure out what critical components to select and how to perform maintenance on these components. This paper studies the selective maintenance for multi-state series-parallel systems with the benefit of repairing multiple components simultaneously. Both time and cost savings can be acquired when several components are simultaneously repaired in a selective maintenance strategy. As the number of repaired components increases, the saved time and cost will also increase due to the share of setting up between components and another additional reduction amount from the repair of multiple identical components. A non-linear optimization model is developed to find the most reliable system subjected to time and cost constraints. Genetic algorithm is used to solve the optimization model. An illustrative example will be provided.
Natural Sciences and Engineering Research Council of Canada (NSERC) and Vietnam International Education Development (VIED)
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Lai, Tsan-kei, and 黎贊基. "Condition auditing and repair of marine concrete structures in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B43894550.
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Atterberg, Sheryl Wilkinson. "Factors related to consumer's perception of household appliance repair costs." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9898.
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Abdo, Fady. "Decision analysis for the prioritization of maintenance and repair activities on engineering facilities." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0021/MQ43990.pdf.
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Strohmeier, Jörg Harald. "Deterioration of reinforced concrete in a marine environment : repair costs and maintenance strategies." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/8479.
Full textAbstract:
Bibliography: p. 108.This dissertation comprises an investigation into the rate at which reinforced concrete structures deteriorate in the Cape Peninsula due to reinforcement corrosion, the reasons for this deterioration, and the accompanying repair costs. The costing of repair work is calculated per m2 of reinforced concrete and is based on quoted labour rates and material rates of repair materials supplied by four major suppliers in the Western Cape. Formulas are included which enable a person using the data listed in tables and figures to calculate what repair costs will be in future, and also enable the calculation of monthly/annual deposit amounts in order to save sufficient money for future maintenance at a specified date. Life cycle costing and decision models for the maintenance of concrete structures are discussed and guidelines for the establishment of optimal maintenance cycles are included. Based on the results of the life cycle costing exercise the importance of planned preventative maintenance is highlighted. Finally, locally and internationally available maintenance management computer systems are reviewed.
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Whitlock, Wayne Ronald. "A critical analysis of service quality perceptions of vehicle repair and maintenance retailers." Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1516.
Full textAbstract:
The South African motor industry plays a pivotal role in the economy of South Africa and is a leading indicator in economic change. In general, satisfaction of customer service in the motor industry is steadily improving. However, as research has shown, there is still room for improvement within the industry. Knowing what customers expect is a critical step in delivering good quality service to ensure customer retention in the long-term (Zeithaml, Parasuraman & Berry 1990:62-63). Having a good understanding of the value of forming long-term relationships with customers and their evaluation of the quality of the service provided, cannot be underestimated, as failure to actually ask customers what they think of the service could be detrimental in the long-term. Vehicle manufacturers conduct ongoing research to monitor customer perceptions of the quality of the service provided by their vehicle retailers. The information generated from the research findings can be used by manufacturers to improve levels of service where this appears to be lacking, and deal promptly with any customer complaints. Against this background, how vehicle owners judge the quality of the service provided by a franchised vehicle retailer for a repair and maintenance service, will be crucial to understanding how customers form perceptions of service related firms specifically, and in general, even an entire industry. The primary objective of this study is to assess customer perceptions of service quality with a franchised vehicle retailer following a routine repair and maintenance service. The sample consisted of 3 859 respondents who had their vehicles serviced at a GM South Africa franchised vehicle retailer over a one month period. The empirical results of the study revealed that GM South Africa show general positive results in terms of customer service satisfaction, however, there are some areas where additional attention is required.
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蔡玉寧 and Yuk-ning Alta Choi. "Repair technology for cracked metallic structures using composite materials." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31222420.
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Rehmert, Ian Jon. "Availability Analysis for the Quasi-Renewal Process." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/29270.
Full textAbstract:
The behavior of repairable equipment is often modeled under assumptions such as perfect repair, minimal repair, or negligible repair. However the majority of equipment behavior does not fall into any of these categories. Rather, repair actions do take time and the condition of equipment following repair is not strictly "as good as new" or "as bad as it was" prior to repair. Non-homogeneous processes that reflect this type of behavior are not studied nearly as much as the minimal repair case, but they far more realistic in many situations. For this reason, the quasi-renewal process provides an appealing alternative to many existing models for describing a non-homogeneous process. A quasi-renewal process is characterized by a parameter that indicates process deterioration or improvement by falling in the interval [0,1) or (1,Infinity) respectively. This parameter is the amount by which subsequent operation or repair intervals are scaled in terms of the immediately previous operation or repair interval. Two equivalent expressions for the point availability of a system with operation intervals and repair intervals that deteriorate according to a quasi-renewal process are constructed. In addition to general expressions for the point availability, several theoretical distributions on the operation and repair intervals are considered and specific forms of the quasi-renewal and point availability functions are developed. The two point availability expressions are used to provide upper and lower bounds on the approximated point availability. Numerical results and general behavior of the point availability and quasi-renewal functions are examined. The framework provided here allows for the description and prediction of the time-dependent behavior of a non-homogeneous process without the assumption of limiting behavior, a specific cost structure, or minimal repair.Ph. D.
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Thukaram, Santosh Kumar. "Robot based 3D welding for jet engine blade repair and rapid prototyping of small components." 2010. http://hdl.handle.net/1993/4295.
Full textAbstract:
Aero engines are made up of a large number of blades which are subject to wear and damage. They are expensive and must be repaired wherever possible. Engines also have small components which are required in small numbers that need to be developed rapidly.
The first part of this research work focuses on developing a robust automated blade repair method using robotic welding. Optimal weld parameters were developed for build-up of edges having different thicknesses. Samples with varying Current and varying travel speed were produced and their micro hardness values were compared. Blade profiles were welded upon.
The second part involves a methodology for producing small components using rapid prototyping (RP) techniques. This part involves use of 3D robotic welding for layered manufacturing. Tensile samples produced using the metal RP method were tested and results were found to be well above the minimum cast specifications for the given material.
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Li, Suh-huey, and 李素惠. "Generalized Maintenance Policies for a System Under Periodic Overhaul." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/9csb68.
Full textAbstract:
博士國立臺灣科技大學
工業管理系
95
To study the maintenance policies in order to reduce the operating cost and the risk of a catastrophic breakdown is quite important. Suppose that an operating system will be damaged by suffering shocks. A system is subject to shocks that arrive according to a non-homogeneous Poisson process for a system subjected to maintenance(s), where . As shocks occur a system has two types of failures. One is type I failure (minor failure) which can be removed by a minimal repair and the other is type II failure (catastrophic failure) which can be removed by an unplanned overhaul (or unplanned replacement if ). A system undergoes unplanned overhaul (or unplanned replacement if ) at the time of the first type II failure occurs, or A system undergoes planned overhaul (or planned replacement if ) at the time of the total operating time reaches T (T hours from the last maintenance) for a system subjected to maintenance(s), whichever occurs first. After a replacement, the procedure is repeated. In this thesis, we make a study of three maintenance policies for a system under periodic overhaul. The first considers the probability of type II failure is 0 (We do not consider unplanned overhaul or unplanned replacement here). The second considers the probability of type II failure depends on the number of maintenance period and the number of the arriving shock since the last maintenance. The third considers the probability of type II failure depends on the number of maintenance period and the time of the arriving shock since the last maintenance. For the above three maintenance policies, the unique optimal policy which minimizes the expected cost rate per cycle under certain conditions is derived respectively. The research results in which three maintenance policies are discussed in this dissertation can be a reference for setting maintenance policies to analogous system and product.