Dissertations / Theses on the topic 'Integrated maintenance'
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1
Chen, Chun-Hung. "Integrated management of highway maintenance and traffic." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/64.
Abstract:
Thesis (Ph. D.) -- University of Maryland, College Park, 2003.Thesis research directed by: Civil Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
2
Henry, Joel. "An integrated approach to software process assessment." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-170922/.
3
Rosen, Charles Michael. "Demonstration : integrated diagnostics/prognostics for condition-based maintenance." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/18954.
4
Pringle, Abbie. "Eating disorders : A integrated approach to vulnerability and maintenance." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526517.
5
Barber, Darrin E. (Darrin Eugene). "Shipboard condition based maintenance and integrated power system initiatives." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68571.
Abstract:
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 80-81).
With the U.S. Navy's continued focus on developing and implementing a robust integrated power system aboard future combatants, there has been an ever increasing effort to guarantee an electrical distribution system that maintains maximum capabilities in the event of a system fault. It is believed that the implementation of a device such as a non-intrusive load monitor (NILM) can greatly assist in the preemptive detection of such faults and failures. Ongoing NILM research conducted at Massachusetts Institute of Technology's Laboratory for Electromagnetic and Electronic Systems (LEES) is exploring the application of NILM technology in shipboard environments. The NILM's unique ability to the monitor the power usage profile of these systems can be used to immediately diagnose system casualties and unusual operation parameters. Additionally, research has shown that the NILM can be used effectively and reliably, to monitor equipment health, recognize and indicate abnormal operating conditions and casualties and provide invaluable information for training operators, diagnosing problems and troubleshooting. This thesis will discuss how this frequency content of the aggregate measurement can be used to assess the health of motors. Experiments were conducted in the confines of LESS in addition to aboard USCGC ESCANABA (WMEC-907), a 270-foot Coast Guard Cutter, in order to better understand the system dynamics in a real life environment. To further support the US Navy's integrated power system initiatives two hardware models of a shipboard electrical propulsion drive system were constructed, an MVDC propulsion simulation and a doubly-fed machine propulsion model. These simulations were built for the purpose of testing innovative integrated propulsion system theories, algorithms, configurations and new electric propulsion concepts.
by Darrin E. Barber.
S.M.
Nav.E.
6
Costello, Seosamh. "An integrated strategic planning tool for road maintenance funding." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633080.
Abstract:
Previous research in pavement management systems in the United Kingdom has primarily concerned itself with one or other of the two maintenance "tracks" of project and network level analysis. Those systems that do combine both "tracks" adopt a micro level approach to strategic planning at the network level. This work redresses that imbalance by advancing upon previous work, in the form of System BSM and NETCOM, in the development of the Strategic Planning Model (SPM) suite of software programs. In addition, it was decided to include a maintenance standards selection process, which would take account of sociopolitical preferences in addition to economics and legislation in the decision process. This necessitated the creation of a completely new process for the selection of maintenance standards based on multiple criteria analysis (MCA). The SPM adopts a macro level approach to strategic planning, through the STRAT-2 component, while at the same time addressing the much sought after link between the project and network levels by way of the project to network interface (PNI). The PNI provides for seamless transfer of all relevant data, between STRAT-2 and the project to network level system HMS-2, thereby ensuring that detailed project level decisions are not taken in isolation but instead take account of political and economic constraints made at the network level. Conversely it ensures that global or strategic decisions are not taken without reference to the true situation of the road network under review. Maintenance standards selection is executed through the MCA component of the software. The central database (CDB), placed at the heart of the process, ensures integrity of data across the system thereby allowing the strategic decision making process, in STRAT-2, and the prioritisation process, in HMS-2, to proceed with confidence. The CDB has also been designed as a "shell" capable of being customised to the agency's requirements, however basic or advanced in the first instance. This ensures accessibility to a broad spectrum of agencies, from the highly advanced to the resource scarce. This same "shell" design also ensures sustainability of the system by providing the necessary flexibility to evolve with the agency's requirements. Finally, the SPM has been successfully trialed as part of a full scale study on the A30/A35 Exeter to Bere Regis Design Build Finance and Operate (DBFO) project. The industrial sponsor has since taken this "pilot" study forward and is currently implementing the SPM not only on its sister project, the A50 Stoke Derby DBFO, but also as a decision support tool to assist in the bidding process for the forthcoming AI (M) DBFO tender bid. In addition, the industrial sponsor is currently in the process of implementing the SPM in the "Super" Agency Area 12 in Birmingham to assist with periodic maintenance planning.
7
Mohamed, Abdelhafiez M. A. "An integrated framework for maintenance optimisation with petroleum industry." Thesis, Sheffield Hallam University, 2016. http://shura.shu.ac.uk/20073/.
Abstract:
Maintenance concerns abound as companies strive to increase production while guaranteeing safety, flow assurance and equipment reliability. Therefore, optimisation of the maintenance process is essential to increasing the productivity of the equipment as well as decreasing the maintenance expenditure. Thus, this research is aimed at proposing an integrated framework to optimise the major maintenance activities at strategic and operational levels including spare parts control and risk assessment within the petroleum industry. In this research, the selection of the maintenance optimum policy for equipment within petroleum industry is dealt with at strategic level through multi criteria decision making techniques (classic and fuzzy analytic hierarchy process FAHP). At the operational level, a cost optimisation mathematical model is proposed to balance the costs of failure of a unit during operation against the cost of preventive maintenance to ensure preventive maintenance activities are kept at minimum possible cost without compromising the utilisation of equipment's performance. Furthermore, an integrated approach between spare parts management and preventive maintenance activities is developed to create a cost effective method and ensuring the availability of parts in the stock while carrying out preventive maintenance. A risk assessment model for equipment within the petroleum industry is developed to handle the likelihood of risk and its consequences. A mathematical equation is developed to predict the likelihood of risks and identify the optimum inspection interval. In addition, set of modified mathematical equations to evaluate consequences of risk and weighing the severity of risks in specific areas is developed. The findings of this research indicate that the proposed FAHP will clearly guide the practitioners in selecting the optimum maintenance policies at strategic level by the consideration of the related criteria and the possible alternatives for petroleum equipment. The results from the proposed mathematical model for scheduling preventive maintenance activities showed promising results in terms of cost effectiveness, reliability and availability of equipment without compromising the Inherent safety of the equipment. The integration between preventive maintenance intervals and the control of spare parts provided the petroleum companies with predictable movement of parts at the right time and hence minimises the cost of inventory. The developed equation for the consequences of risk can be used to evaluate the level of risk under different combination of sets of weight which suit the situation under consideration.
8
Hatcher, Charles S. "An analysis of depot level maintenance for the H-60 helicopter under an integrated maintenance concept." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA340983.
Abstract:
Thesis (M.S. in Management) Naval Postgraduate School, September 1997."September 1997." Thesis advisor(s): William Gates, John E. Mutty, Don R. Eaton. Includes bibliographical references (p. 109). Also available online.
9
Lopez, Alvarado Paula Andrea. "Integrated scheduling and information support system for transit maintenance departments." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001151.
10
Coopoosamy, Kribban. "An integrated maintenance management system model for the pharmaceutical industry." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1583.
Abstract:
Organisations are continuously seeking for strategies to improve operations and gain competitive advantage. Maintenance tends to be a key management issue for many industrial companies. Maintenance management, being an integral part of manufacturing, can influence competitive companys‟ priorities, such as cost, quality and flexibility, and, hence, business strategy directly. The pharmaceutical industry also faces some unique challenges such as increasingly stringent safety and quality regulations, the effect of innovations in medical science and healthcare and a complex and costly design-to-market process (from product concept and development to market delivery). The industry is also going through turbulent times as it has to cope with challenges common to many other industries, how to deal with increasing competition, hold down costs, and expand. Regulatory compliance is one of the significant industry drivers for pharmaceutical companies. Regulations are enacted by government authorities to ensure public health and safety. The focus of regulation is on quality assurance and control in all areas such as receiving, manufacturing, storing, packaging, despatching and delivering. Apart from the required quality and safety checks, the regulations also mandate extensive record keeping of procedures, processes and systems. This treatise will investigate the maintenance management system of a pharmaceutical company and compare it to best practices. The true name of the pharmaceutical company that will be researched will not be disclosed for confidentiality reasons, instead it will be called My Pharmaceuticals. The company is based in Port Elizabeth. The research consists of a preliminary study to identify the problem areas in the maintenance management system within the company. A literature review of best practices in maintenance management systems combined with an investigation into the best pharmaceutical practices in maintenance management systems and regulatory controls are investigated and a model will be proposed to improve the current situation at the company.
11
El-Haram, Mohamed Abdulla. "Integrated approach to condition-based reliability assessment and maintenance planning." Thesis, University of Exeter, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318185.
12
Bittlestone, David. "A documentation paradigm for an integrated software maintenance support environment." Thesis, Durham University, 1992. http://etheses.dur.ac.uk/6020/.
Abstract:
Recent advances in computer hardware have not been matched by comparable advances in computer software, inhibiting the production of reliable software at greater levels of productivity. Development of software is restricted by the so-called "maintenance backlog". Productivity in the maintenance sector has not kept pace with increasing annual labour costs, making the maintenance of software the major item in the budget, of organisations responsible for the development and maintenance of software. Gains in productivity can be anticipated by the exploitation of software-maintenance tools, within the framework of an Integrated .Software Maintenance Support Environment (ISMSE). for which a high-level design has been proposed in this thesis, offering comprehensive support for all phases of the software life-cycle, particularly the maintenance phase. A key factor in the reliable modification of software is the time taken to gain the prerequisite understanding, by a study of the system's documentation. This documentation degrades over a period of time, becoming unreliable, inhibiting maintenance of the software, which may be a large capital asset, ultimately, the software may become impossible to maintain, requiring replacement. Understanding gained during maintenance is wide-ranging and at various levels of abstraction, but is often NOT well-recorded, since no effective documentation system exists for recording the maintenance history of large software systems. The documentation paradigm in this thesis, used within the framework of an ISMSE, aims to provide a means of recording the knowledge gained during maintenance, facilitating easier future maintenance, and preserving the reliability of the documentation, so reducing the time required to gain an understanding of the software being maintained. This provides a powerful means of increasing productivity, while simultaneously preserving a valuable capital asset.
13
Melnychenko, Oleksandr, and Ruslan Kostyrko. "Integrated reporting - a tool for the companies’ responsible operation maintenance." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/54616.
Abstract:
1. Sustainability Reporting Guidelines URL: https://www.globalreporting.org/resourcelibrary/G3.1-Guidelines-Incl-Technical-Protocol.pdfIt has been specified that changes in the corporate governance paradigm and the interests of stakeholders determine the transformation of corporate reporting. The roadmaps for solving the problem of integrated reporting generation and analysis for the purposes of different users’ information requests were offered.
14
Al-Arfaj, Khalid Abdulaziz. "Generator maintenance scheduling models in power systems : integrated cost models for generator maintenance strategy under market environment." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4316.
Abstract:
Change from a regulated to deregulated structure means that, the centralized maintenance system is not valid any more. In the surveyed published literature, there is not a single model which incorporates all maintenance cost components to analyze the effect of different maintenance strategies for generator companies (GENCOs). The work enclosed in this thesis demonstrates that there is a considerable requirement for accurately modelling cost components of the maintenance model, to be used in maintenance scheduling for deregulated power system, in order to attain a superior schedule with major financial and operational impact. This research investigates and models most cost factors that affect the maintenance activities of the deregulated GENCOs, and demonstrates the utilization of the developed cost models in maintenance scheduling. It also presents the data gathering process for the developed maintenance cost model. A generator maintenance scheduling model that considers direct and indirect maintenance costs, opportunity costs (i.e. loss of customer goodwill), effective maintenance strategies, failures, and interruptions is developed. A Genetic Algorithm (GA) based approach is employed to achieve maintenance schedules to various generators maintenance scenarios. An Analytical Hierarchy Process (AHP) approach is proposed for modelling customer goodwill. The maintenance model was redeveloped under the Reliability Centred Maintenance (RCM) strategy to analyze the effect of a maintenance strategy on maintenance costs. Case studies are presented to demonstrate the utilisation of the developed models.The investigation shows that the market prices, opportunity costs and maintenance strategy have an effect on the final maintenance schedule. The research demonstrates that the cost components are critical factors to achieve an effective maintenance schedule, and they must be considered and carefully modelled in order to reflect more realistic situation for maintenance scheduling of generator units in deregulation environment.
15
Al-Arfaj, Khalid A. "Generator Maintenance Scheduling Models in Power Systems. Integrated Cost Models for Generator Maintenance Strategy under Market Environment." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4316.
Abstract:
Change from a regulated to deregulated structure means that, the centralized maintenance system is not valid any more. In the surveyed published literature, there is not a single model which incorporates all maintenance cost components to analyze the effect of different maintenance strategies for generator companies (GENCOs). The work enclosed in this thesis demonstrates that there is a considerable requirement for accurately modelling cost components of the maintenance model, to be used in maintenance scheduling for deregulated power system, in order to attain a superior schedule with major financial and operational impact.
This research investigates and models most cost factors that affect the maintenance activities of the deregulated GENCOs, and demonstrates the utilization of the developed cost models in maintenance scheduling. It also presents the data gathering process for the developed maintenance cost model. A generator maintenance scheduling model that considers direct and indirect maintenance costs, opportunity costs (i.e. loss of customer goodwill), effective maintenance strategies, failures, and interruptions is developed.
A Genetic Algorithm (GA) based approach is employed to achieve maintenance schedules to various generators maintenance scenarios. An Analytical Hierarchy Process (AHP) approach is proposed for modelling customer goodwill. The maintenance model was redeveloped under the Reliability Centred Maintenance (RCM) strategy to analyze the effect of a maintenance strategy on maintenance costs. Case studies are presented to demonstrate the utilisation of the developed models.The investigation shows that the market prices, opportunity costs and maintenance strategy have an effect on the final maintenance schedule. The research demonstrates that the cost components are critical factors to achieve an effective maintenance schedule, and they must be considered and carefully modelled in order to reflect more realistic situation for maintenance scheduling of generator units in deregulation environment.
16
Chan, Pui Shan. "Support for an integrated approach to program understanding : an application of software visualisation." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4666/.
Abstract:
Program Comprehension is a key factor in providing effective software maintenance and enabling successful evolution of software systems. The objective of this research is to provide a framework and mechanism to facilitate the understanding of large software systems. There exist a number of theories and models of Program Comprehension where each favours a different approach to comprehension. It is evident that there is no real consensus on how maintainers understand software systems. The disparities in the comprehension strategies are largely dependent on the personal and circumstantial factors. Factors such as the level of technical competence of the maintainers, the size and complexity of the piece of software, and the types and goals of the maintenance activities can influence the process of comprehension. This research proposes an alternative approach to Program Comprehension. It acknowledges that the process of comprehension is opportunistic, and that the current comprehension theories are inadequate in addressing this. There is a need for a more flexible approach towards comprehension, and the Integrated Approach proposed in this thesis provides a way for the utilisation of the various comprehension theories under a single environment. It recognises that any one of the comprehension theories may become active during comprehension. Under the Integrated Approach, maintainers have the option of selecting and executing the various comprehension strategies as they see fit. The Integrated Approach to comprehension is based on a matrix of Program Relationships between Program Elements of a programming language. In this thesis, these Program Relationships are derived for the C programming language constructs. This work also involves the investigation of the roles of both textual and graphical representations during the comprehension process. Both representations are commonly used to alleviate the problem of information overloading when maintainers trying to understand and maintain a software system. The Integrated Approach is realised in a tool named PUI (program understanding implements) which provides an environment enabling the utilisation of various comprehension theories.
17
Saxena, Abhinav. "Knowledge-Based Architecture for Integrated Condition Based Maintenance of Engineering Systems." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16125.
Abstract:
A paradigm shift is emerging in system reliability and maintainability. The military and industrial sectors are moving away from the traditional breakdown and scheduled maintenance to adopt concepts referred to as Condition Based Maintenance (CBM) and Prognostic Health Management (PHM). In addition to signal processing and subsequent diagnostic and prognostic algorithms these new technologies involve storage of large volumes of both quantitative and qualitative information to carry out maintenance tasks effectively. This not only requires research and development in advanced technologies but also the means to store, organize and access this knowledge in a timely and efficient fashion. Knowledge-based expert systems have been shown to possess capabilities to manage vast amounts of knowledge, but an intelligent systems approach calls for attributes like learning and adaptation in building autonomous decision support systems.
This research presents an integrated knowledge-based approach to diagnostic reasoning for CBM of engineering systems. A two level diagnosis scheme has been conceptualized in which first a fault is hypothesized using the observational symptoms from the system and then a more specific diagnostic test is carried out using only the relevant sensor measurements to confirm the hypothesis. Utilizing the qualitative (textual) information obtained from these systems in combination with quantitative (sensory) information reduces the computational burden by carrying out a more informed testing. An Industrial Language Processing (ILP) technique has been developed for processing textual information from industrial systems. Compared to other automated methods that are computationally expensive, this technique manipulates standardized language messages by taking advantage of their semi-structured nature and domain limited vocabulary in a tractable manner.
A Dynamic Case-based reasoning (DCBR) framework provides a hybrid platform for diagnostic reasoning and an integration mechanism for the operational infrastructure of an autonomous Decision Support System (DSS) for CBM. This integration involves data gathering, information extraction procedures, and real-time reasoning frameworks to facilitate the strategies and maintenance of critical systems. As a step further towards autonomy, DCBR builds on a self-evolving knowledgebase that learns from its performance feedback and reorganizes itself to deal with non-stationary environments. A unique Human-in-the-Loop Learning (HITLL) approach has been adopted to incorporate human feedback in the traditional Reinforcement Learning (RL) algorithm.
18
Mattsson, Hans-Åke. "Integrated Bridge Maintenance : Evaluation of a pilot project and future perspectives." Doctoral thesis, KTH, Brobyggnad inkl stålbyggnad, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9572.
Abstract:
The trend in many countries is to outsource maintenance with competitive tendering. The design of the tender is then a crucial issue. A new type of tendering contract, called "Integrated Bridge Maintenance", was introduced in one experimental area in Sweden. In this case the preventive bridge maintenance is separated from the standard road maintenance contract. The ideas behind these changes are that the new approach can increase efficiency through a combination of increased specialization, economies of scale and through giving the private contractor a greater degree of freedom concerning exactly what to do and exactly when to do it. A pilot project has been running since 2004 for all bridges in Uppsala County with about 400 bridges and since 2007 for all bridges in Örebro County with about 700 bridges. The experiences and lessons from this pilot project are presented in this thesis together with guidelines on how to procure Integrated Bridge Maintenance in the future. An important feature of the contract was that it contained a combination of specific measures that the contractor should carry out and properties of the bridges that the contractor was responsible to maintain. This created a balance between predictability and flexibility for the contractor. The contractor could make long term planning for the work. The client was satisfied because of increased competence and a low price. The latter can partly be explained by the possibility for the specialised bridge crew to receive additional work from other clients. As information about old bridges always is incomplete a partnering structure needs to be built into the contract. Experience has also shown that a conscious policy to maintain long run competition is important. The general conclusion is that the project was seen as successful and as creating more "value for money". To manage a bridge stock optimally from a life cycle perspective is a very complex task, since the conditions for the individual bridge can vary greatly from place to place which the answers from the research questions indicate. Besides following-up and evaluating the Integrated Bridge Maintenance projects a number of research questions have been studied. Is Integrated Bridge Maintenance a successful method to increase the effectiveness and to increase the standard in bridge maintenance alternatively increasing the service life for the bridge stock at an optimal cost, i.e., will IBM lead to lower LCC? It is difficult to answer this question with exact numbers after so short time, but so far the opinion is that the effectiveness has increased. How can a bridge stock develop over a long time e.g. 15 years? Based on historical data one can calculate, for instance, new construction rate, demolition rate and average age for the bridge stock. This information could together with different future scenarios be a basis for different bridge management strategies for the actual bridge stock. What is the real service life for a bridge? Survival analysis for the different types of bridges in the actual bridge stock will give a good estimate of the different expected service life. Why and at which age are bridges demolished? Two main reasons were found in this study: deterioration process of the bridge had gone too far and/or load bearing capacity was too low, and road were rerouted. What is the real service life for a bridge edge beam, one of the most often repaired element of Swedish bridges? Survival analysis of edge beams located on different types of roads will give a good estimate of the different expected service life. How should a long-term contract for bridge maintenance and specially Integrated Bridge Maintenance be procured? The bridge manager should have a good understanding of the answers on the research questions above when the tender documents are to be prepared for the actual bridge stock. Thereafter the area that the contract should cover could be chosen, a good balance between properties and measures, defining the working cycle for properties, a flexible partnering structure in the contract and a suitable length of the contract (x years) inclusive an option (+ y years) and finally good incentives in the contract. To sum up, the main purpose with the doctoral project has been reached. A model for procurement of bridge maintenance has been developed; see the projects in Uppsala and Örebro. The contractor has developed more effective methods for bridge maintenance. The doctoral project has been a step closer to the end goal of reducing the society’s costs for bridge maintenance in the future. The bridges should be functional to the lowest possible cost during its expected service life (LCC). The doctoral project has also contributed with new knowledge in the area of bridge maintenance, the actual development of a bridge stock over time, real service life for road bridges in Sweden and survival analysis.QC 20100826
19
DESAI, ANOOP. "AN INTEGRATED METHODOLOGY FOR ASSEMBLY, DISASSEMBLY AND MAINTENANCE FOR CONSUMER PRODUCTS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1154100938.
20
Mattsson, Hans-Åke. "Integrated bridge maintenance : evaluation of a pilot project and future perspectives /." Stockholm : Arkitektur och samhällsbyggnad, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9572.
21
Hu, Feng-Ming. "Integrated Apartment Management System." CSUSB ScholarWorks, 2006. https://scholarworks.lib.csusb.edu/etd-project/3004.
Abstract:
The Integrated Apartment Management System (IAMS) is a web-based system that allows tenants to make appointments with repairmen on line and notify both apartment managers and repairmen of appointments through an email directly from IAMS. IAMS also keeps a database of appointments, repairs, and payments that can be accessed by tenants, repairmen, and apartment managers.
22
Li, Jin. "Simulation and Optimization of Integrated Maintenance Strategies for an Aircraft Assembly Process." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8439.
Abstract:
In this thesis, the COMAC ARJ21 fuselage’s final assembly process is used as a
case study. High production rate (i.e. number of aircraft assembled per year) with
reasonable cost is the overall aim in this example. The output of final assembly
will essentially affect the prior and subsequent processes of the overall ARJ21
production. From the collected field data, it was identified that a number of
disruptions (or bottlenecks) in the assembly sequence were caused by
breakdowns and maintenance of the (semi-)automatic assembly machines like
portable computer numerical control (CNC) drilling machine, rivet gun and
overhead crane. The focus of this thesis is therefore on the maintenance
strategies (i.e. Condition-Based Maintenance (CBM)) for these equipment and
how they impact the throughput of the fuselage assembly process.
The fuselage assembly process is modelled and analysed by using agent-based
simulation in this thesis. The agent approach allows complex process interactions
of assembly, equipment and maintenance to be captured and empirically studied.
In this thesis, the built network is modelled as the sequence of activities in each
stage. Each stage is broken down into critical activities which are parameterized
by activity lead-time and equipment used. CBM based models of uncertain
degradation and imperfect maintenance are used in the simulation study. A
scatter search is used to find multi-objective optimal solutions for the CBM
regime, where the maintenance-related cost and production rate are the
optimization objectives. In this thesis, in order to ease computation intensity
caused by running multiple simulations during the optimization and to simplify a
multi-objective formulation, multiple Min-Max weightings are applied to trace
Pareto front. The empirical analysis reviews the trade-offs between the
production rate and maintenance cost and how these objectives are influenced
by the design parameters.
23
Kramer, Anthony J. (Anthony Joseph). "An integrated approach to maintenance in a three-crew, two-shift environment." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/46080.
Abstract:
Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1997, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.Includes bibliographical references (p. 77-78).
by Anthony J. Kramer.
M.S.
24
Matoss, Elnouri Ali. "Maintenance scheduling and inventory control policy in aviation industry : an integrated framework." Thesis, Sheffield Hallam University, 2010. http://shura.shu.ac.uk/20026/.
Abstract:
Airlines seek to minimise operating costs, in all aspect of business areas. Some of these areas are the aircraft maintenance and inventory control policies associated. Maintenance is one of the essential operations in aviation industry. Any shortcoming in maintenance causes reducing in the income rate. In addition, there is a direct relationship between maintenance and inventory department in any company is a vital to guarantee the availability of spare parts to carry out the required maintenance. Therefore, this research presents an integrated framework for maintenance scheduling and inventory control policies in aviation industry, aiming to minimise the maintenance cost by addressing a models for determining the optimum maintenance scheduling for aircraft components and its inventory control policy. The interval between maintenance for the components is optimised by minimising the total cost. This consists of labour cost, spare parts cost and delay cost etc. A decision to replace a component must also be taken when a component cannot attain the minimum reliability. Mathematical models are developed to calculate the expected costs based on the cost of corrective, preventive maintenance and the probability of failure. The maintenance scheduling mathematical model is developed to act as a maintenance decision making model to determine the optimum preventive maintenance interval of the expensive aircraft components. A decision making inventory control model to balance the cost of repair and purchase cost is developed and will be integrated with the scheduling maintenance to guarantee the availability of the required components and act as an integrated framework, this would facilitate the decision making process in aviation industry in relation to scheduling and inventory policies.
25
Sangregorio, Paolo. "Integrated methodologies of software development and remote maintenance for semi-automated machines." Doctoral thesis, Università degli studi di Bergamo, 2017. http://hdl.handle.net/10446/77299.
Abstract:
Day after day, vendors of manufacturing machineries are challenged with the need of flexibility and reconfigurability of their products.
Be able to rapidly provide various variants and configurations of the products in response to customers requests is an important asset for every company in the nowadays competition. Nevertheless, most of the automation software for special machines is still built in a monolithic way which does not support rapid reconfigurability to reflect hardware modifications.
And once the machine is delivered to the customer site, the maintenance process begins. Maintenance costs are increasing with the globalized market due to travel costs for sending service personnel to the customer plants.
In some cases, the issue would have been easily solved if only the technichian had been able to be on the site. This makes remote diagnosis, debugging and repair an obvious advantage.
This thesis presents two approaches to solve the aforementioned issues. A modular and reconfigurable approach to software development for the automation to support rapid reconfigurations of the software, and a remote maintenance methodology that uses wireless and mobile technology to record and transmit video and machine operational parameters together for remote viewing and analysis.
26
Ayandokun, O. K. "The incremental motion encoder : a sensor for the integrated condition monitoring of rotating machinery." Thesis, Nottingham Trent University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245075.
27
McCurry, Christopher Todd. "Managerial control of the Army's integrated sustainment maintenance system from a national perspective." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA305795.
Abstract:
Thesis (M.S. in Management) Naval Postgraduate School, December 1995.Thesis advisor(s): David F. Matthews, James E. Suchan. "December 1995." Includes bibliographical references. Also available online.
28
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.
29
Ye, Chen S. M. Massachusetts Institute of Technology. "A system approach to implementation of predictive maintenance with machine learning." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118502.
Abstract:
Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, System Design and Management Program, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 87-91).
Digital technology is changing the industrial sector, yet how to make rational use of some technologies and create considerable value in a variety of industrial scenarios is an issue. Many digital industrial companies have stated that they have helped clients with their digital transformation, create much value, but the real effects have not been shown in public. Venture capitals firms have made huge investment in potential digital industrial startups. Numerous industrial IoT platforms are emerging in the market, but a number of them fade soon after. Many people have heard about industrial maintenance technology, but they have difficulty in differentiate concepts such as reactive maintenance, planned maintenance, proactive maintenance, and predictive maintenance. Many people know that big data and Al are essential in industrial sector, but they do not know how to process, analyze, and extract value from industrial data and how to use Al algorithms and tools to implement a research project. This thesis analyzes the entire digital industrial ecosystem in various dimensions such as initiatives, technologies in related domains, stakeholders, markets, and strategies. This work also analyzes of the predictive maintenance solution in various dimensions such as background, importance, suitable scenarios, market, business model, and technology. The author plans an experiment for the predictive maintenance solution, including goal, data source and description, methods and steps, and flow and tools. Then author uses a baseline approach and an optimal approach to implement the experiment, including data preparation, selection and evaluation of both regression and classification models, and deep learning practice through neural network building and optimization. Finally, contributions and expectations, and limitations and future research are discussed. This work uses a system approach, including system architecting, system engineering, and project management, to complete the process of analysis, design, and implementation.
by Chen Ye.
S.M. in Engineering and Management
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Edakara, Sibson Dalgo. "A novel methodology to investigate the performance of production line systems using an integrated product service system approach." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/a-novel-methodology-to-investigate-the-performance-of-production-line-systems-using-an-integrated-product-service-system-approach(9d2163cc-511c-4801-bc9c-18f2f7b5b6a2).html.
Abstract:
Production Line Systems (PLS) are ubiquitous in today’s manufacturing industry. The need for enhanced efficiencies and higher throughput in such systems has increased their complexity and size that has made performance analysis challenging for practitioners. This thesis introduces a novel approach based on Product Service System (PSS) design and analysis which simplifies Production Line System study and identifies opportunities for performance improvement that can be quantified based on the hardware and maintenance system performance. The approach involves modelling and simulation techniques based on reliability engineering principles and systems thinking. In order to apply the principles of PSS approach to PLS, it is essential to draw a comparison between PLS and PSS, so as to take account of the differences while applying the new approach; a literature review has been carried out on PSS Design and Analysis, that identified the state of the art modelling and simulation techniques in PSS. Additionally, a separate literature review on maintenance system and production line was carried out. This enabled the PSS methodology to be applied to PLS by incorporating the differences. A systems thinking approach has been employed to create the static simulation model of the integrated production line system by means of schematic representations. Key improvement areas, identified from the static simulation model have been modelled dynamically to incorporate the stochastic behaviour of the system. All the dynamic models are developed using a Discrete Event Simulation platform. These models were supported by Monte Carlo Simulation, queuing principles, probabilistical and statistical methods pertinent to reliability engineering. The novel integrated simulation model consists of a production line model and a maintenance system model. The production line model simulates two types of failures in addition to the outages in the system: breakdowns and short stops. The maintenance system model simulates the maintenance actions in the production line by considering the resources availability, repair time, and resources travelling time amongst others. In addition, the maintenance model is capable of optimizing the preventive maintenance interval for maintainable failures for cost, availability and criticality while taking into account the maintenance effectiveness value from the failure data. The simulation model is validated using an industrial case study which consists of a large production line for beer. Sensitivity studies on the simulation model enabled the case study company to focus on strategies for throughput improvement by improving the reliability and maintainability, optimal resources allocation and maintenance interval optimization in targeted areas in the large and complex system. The model developed is generic and can easily be applied to analyse other industrial production line systems. It can also be used as a design tool for new production lines.
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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.
Abstract:
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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Schulz, Kimberly J. "Impact of the integrated maintenance concept on EA-6B readiness and maintenance support at NAS Whidbey Island, WA and NADEP Jacksonville, FL." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FSchulz.pdf.
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Peti, Philipp. "Diagnosis and maintenance in an integrated time triggered architecture tackling the trouble identified phenomenon." Saarbrücken VDM Verlag Dr. Müller, 2005. http://d-nb.info/989292177/04.
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Schlunz, Evert Barend. "Decision support for generator maintenance scheduling in the energy sector." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18060.
Abstract:
Thesis (MSc)--Stellenbosch University, 2011.ENGLISH ABSTRACT: As the world-wide consumption of electricity continually increases, more and more pressure is put on the capabilities of power generating systems to maintain their levels of power provision. The electricity utility companies operating these power systems are faced with numerous challenges with respect to ensuring reliable electricity supply at cost-e ective rates. One of these challenges concerns the planned preventative maintenance of a utility's power generating units. The generator maintenance scheduling (GMS) problem refers to the problem of nding a schedule for the planned maintenance outages of generating units in a power system (i.e. determining a list of dates corresponding to the times when every unit is to be shut down so as to undergo maintenance). This is typically a large combinatorial optimisation problem, subjected to a number of power system constraints, and is usually difficult to solve. A mixed-integer programming model is presented for the GMS problem, incorporating constraints on maintenance windows, the meeting of load demand together with a safety margin, the availability of maintenance crew and general exclusion constraints. The GMS problem is modelled by adopting a reliability optimality criterion, the goal of which is to level the reserve capacity. Three objective functions are presented which may achieve this reliability goal; these objective functions are respectively quadratic, nonlinear and linear in nature. Three GMS benchmark test systems (of which one is newly created) are modelled accordingly, but prove to be too time consuming to solve exactly by means of an o -the-shelf software package. Therefore, a metaheuristic solution approach (a simulated annealing (SA) algorithm) is used to solve the GMS problem approximately. A new ejection chain neighbourhood move operator in the context of GMS is introduced into the SA algorithm, along with a local search heuristic addition to the algorithm, which results in hybridisations of the SA algorithm. Extensive experiments are performed on di erent cooling schedules within the SA algorithm, on the classical and ejection chain neighbourhood move operators, and on the modi cations to the SA algorithm by the introduction of the local search heuristic. Conclusions are drawn with respect to the e ectiveness of each variation on the SA algorithm. The best solutions obtained during the experiments for each benchmark test case are reported. It is found that the SA algorithm, with ejection chain neighbourhood move operator and a local search heuristic hybridisation, achieves very good solutions to all instances of the GMS problem. The hybridised simulated annealing algorithm is implemented in a computerised decision support system (DSS), which is capable of solving any GMS problem instance conforming to the general formulation described above. The DSS is found to determine good maintenance schedules when utilised to solve a realistic case study within the context of the South African power system. A best schedule attaining an objective function value within 6% of a theoretical lowerbound, is thus produced.
AFRIKAANSE OPSOMMING: Met die wêreldwye elektrisiteitsverbruik wat voortdurend aan die toeneem is, word daar al hoe meer druk geplaas op die vermoë van kragstelsels om aan kragvoorsieningsaanvraag te voldoen. Nutsmaatskappye wat elektrisiteit opwek, word deur talle uitdagings met betrekking tot betroubare elektrisiteitsverskaffing teen koste-e ektiewe tariewe in die gesig gestaar. Een van hierdie uitdagings het te make met die beplande, voorkomende instandhouding van 'n nutsmaatskappy se kragopwekkingseenhede. Die generator-instandhoudingskeduleringsprobleem (GISP) verwys na die probleem waarin 'n skedule vir die beplande instandhouding van kragopwekkingseenhede binne 'n kragstelsel gevind moet word ('n lys van datums moet tipies gevind word wat ooreenstem met die tye wanneer elke kragopwekkingseenheid afgeskakel moet word om instandhoudingswerk te ondergaan). Hierdie probleem is tipies 'n groot kombinatoriese optimeringsprobleem, onderworpe aan 'n aantal beperkings van die kragstelsel, en is gewoonlik moeilik om op te los. 'n Gemengde, heeltallige programmeringsmodel vir die GISP word geformuleer. Die beperkings waaruit die formulering bestaan, sluit in: venstertydperke vir instandhouding, bevrediging van die vraag na elektrisiteit tesame met 'n veiligheidsgrens, die beskikbaarheid van instandhoudingspersoneel en algemene uitsluitingsbeperkings. Die GISP-model neem as optimaliteitskriterium betroubaarheid en het ten doel om die reserwekrag wat gedurende elke tydperk beskikbaar is, gelyk te maak. Drie doelfunksies word gebruik om laasgenoemde doel te bereik (naamlik doelfunksies wat onderskeidelik kwadraties, nie-lineêr en lineêr van aard is). Drie GISP-maatstaftoetsstelsels (waarvan een nuut geskep is) is dienooreenkomstig gemodelleer, maar dit blyk uit die oplossingstye dat daar onprakties lank gewag sal moet word om eksakte oplossings deur middel van kommersiële programmatuur vir hierdie stelsels te kry. Gevolglik word 'n metaheuristiese oplossingsbenadering ('n gesimuleerde temperingsalgoritme (GTA)) gevolg om die GISP benaderd op te los. 'n Nuwe uitwerpingsketting-skuifoperator word in die konteks van GISP in die GTA gebruik. Verder word 'n lokale soekheuristiek met die GTA vermeng om 'n basteralgoritme te vorm. Uitgebreide eksperimente word uitgevoer op verskeie afkoelskedules binne die GTA, op die klassieke en uitwerpingsketting-skuifoperators en op die verbasterings van die GTA meegebring deur die lokale soekheuristiek. Gevolgtrekkings word oor elke variasie van die GTA se e ektiwiteit gemaak. Die beste oplossings vir elke toetsstelsel wat gedurende die eksperimente verkry is, word gerapporteer. Daar word bevind dat die GTA met uitwerpingsketting-skuifoperator en lokale soekheuristiek-verbastering baie goeie oplossings vir die GISP lewer. Die verbasterde GTA word in 'n gerekenariseerde besluitsteunstelsel (BSS) geïmplementeer wat 'n gebruiker in staat stel om enige GISP van die vorm soos in die wiskundige programmeringsmodel hierbo beskryf, op te los. Daar word bevind dat die BSS goeie skedules lewer wanneer dit gebruik word om 'n realistiese gevallestudie binne die konteks van die Suid-Afrikaanse kragstelsel, op te los. 'n Beste skedule met 'n doelfunksiewaarde wat binne 6% vanaf 'n teoretiese ondergrens is, word ondermeer bepaal.
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Arcella, Joseph Louis. "Comparative Analysis of Current Performance-Based Maintenance Methods to Improve Virginia Highways." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19321.
Abstract:
This research was completed in two phases; phase-one involved a mini-scan study of the highway maintenance industry to identify the current state-of-practice in performance-based maintenance contracting (PBMC). Phase one gathered information on domestic and foreign agencies currently using performance-based maintenance on highways. Phase two used the mini-scan study information to build, compare and analyze agency timelines (i.e., VDOT to others). Timelines included major milestones at each agency; milestones which enabled innovation in the field of performance-based contracting. The purpose of comparing VDOT to other agencies was to provide VDOT with industry best practices as well as recommendations for future contract evolutions. Timelines were constructed for Florida DOT, Main Roads of Western Australia, England\'s Highways Agency and New Zealand Transport Agency. Connection links were made between VDOT and the other four agencies based on similarities in procurement laws and maintenance milestones (i.e., 1st Design-Build project). The timeline linkages and collection of information on benefits associated with PBMC (compared to traditional method-based maintenance) were used to make five recommendations for VDOT\'s future maintenance program. VDOT recommendations were: Use performance-based contracting on secondary roads, use area-wide contracts to cover addition facilities, shift VDOT TAMS focus from lowest-cost to a best-value approach similar to England\'s Managing-Agent Contractor, devise a strategic network of highways to prioritize maintenance, use key performance indicators to align Maintenance Division objectives with overall VDOT organization. Recommendations also considered the current restrictions imposed by Virginia procurement laws.Master of Science
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Lazakis, Iraklis. "Establishing an innovative and integrated reliability and criticality based maintenance strategy for the maritime industry." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=16815.
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Sardellini, Eleonora. "Content and English Language Integrated Learning: The use of Moodle in Aircraft Maintenance Training Programs." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8172/.
Abstract:
The aim of this work is to develop a prototype of an e-learning environment that can foster Content and Language Integrated Learning (CLIL) for students enrolled in an aircraft maintenance training program, which allows them to obtain a license valid in all EU member states. Background research is conducted to retrace the evolution of the field of educational technology, analyzing different learning theories – behaviorism, cognitivism, and (socio-)constructivism – and reflecting on how technology and its use in educational contexts has changed over time. Particular attention is given to technologies that have been used and proved effective in Computer Assisted Language Learning (CALL). Based on the background research and on students’ learning objectives, i.e. learning highly specialized contents and aeronautical technical English, a bilingual approach is chosen, three main tools are identified – a hypertextbook, an exercise creation activity, and a discussion forum – and the learning management system Moodle is chosen as delivery medium. The hypertextbook is based on the technical textbook written in English students already use. In order to foster text comprehension, the hypertextbook is enriched by hyperlinks and tooltips. Hyperlinks redirect students to webpages containing additional information both in English and in Italian, while tooltips show Italian equivalents of English technical terms. The exercise creation activity and the discussion forum foster interaction and collaboration among students, according to socio-constructivist principles. In the exercise creation activity, students collaboratively create a workbook, which allow them to deeply analyze and master the contents of the hypertextbook and at the same time create a learning tool that can help them, as well as future students, to enhance learning. In the discussion forum students can discuss their individual issues, content-related, English-related or e-learning environment-related, helping one other and offering instructors suggestions on how to improve both the hypertextbook and the workbook based on their needs.
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Boral, Soumava. "Integrated Frameworks for Effective Multi-criteria Decision Making in Reliability Centred Maintenance of Industrial Machines." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/88758.
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Sa'ad, Aisha. "Developing integrated maintenance strategies for renewable energy sources based on analytical methods and artificial intelligence (AI) : comparisons and case study." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0080.
Abstract:
Au cours de ces récentes années, le développement des énergies renouvelables, en particulier l'énergie solaire et l'énergie éolienne, a attiré comme méthode alternative de production d'énergie, l'attention du monde entier avec une croissance exceptionnelle de sa production. Selon le rapport de Global Energy, l'énergie solaire mondiale devrait avoir atteint une capacité cumulée de 1 TW, tandis que l'énergie éolienne devrait avoir été multipliée par 3 ou 4 mégas par rapport à la production en 2020. Cette augmentation des énergies solaire et éolienne implique des investissements financiers très importants. Cependant, avec cet énorme potentiel d'investissement et l'augmentation significative de la capacité de production, il y a une responsabilité supplémentaire, souvent négligée : la gestion des centrales électriques pour assurer le coût total du cycle de vie le plus bas (Life Cycle Cost). Comme tout système de production standard, les composants de production d'énergie renouvelable (solaire et éolienne dans notre cas) sont sujets à des défaillances aléatoires qui interrompent la production et l'approvisionnement de la demande. La maintenance est identifiée comme une cause majeure d'accidents, on peut noter le manque de savoir-faire technique dans l'exploitation d'un équipement ou l'absence d'un bon plan de routine de maintenance. Dans le cadre des efforts visant à améliorer l'efficacité et la performance des centrales électriques à énergie renouvelable, nous proposons des modèles pour optimiser la production d'énergie et la maintenance dans nos études de cas sélectionnées (centrale solaire de Sokoto et parc éolien de Katsina au Nigéria). À cet égard, nous avons développé de nouvelles politiques de maintenance intégrées à la production d'énergie des systèmes d'énergie solaire et éolienne. La stratégie de maintenance préventive adoptée dans cette thèse est une stratégie de maintenance parfaite sur les composants sélectionnés pour la maintenance et une maintenance sélective imparfaite sur le système (solaire PV et éolienne). Le manque de batterie en cas de sous-production et les pertes de maintenance sont des défis considérés dans cette étude. La méthodologie que nous avons développée consiste à résoudre le problème d'optimisation de la production d'énergie et de la maintenance en utilisant la méthode théorique ainsi que la méthode d'apprentissage automatique (ANN et SVM) afin de satisfaire une demande aléatoire d'énergie pendant un horizon fini. Nous avons également étudié l'influence des conditions environnementales et opérationnelles des systèmes, puis validé les modèles par des exemples numériques et des études de sensibilité prouvant la robustesse des modèles développésThe development of renewable energy, especially solar and wind energy, over the recent years has gained global attention as an alternative method of generating energy experiencing exceptional growth in its production. In The Global Energy report, global solar energy is expected to have reached a cumulative capacity of 1TW while the wind energy is expected to have multiplied up to 3 to 4 times from mega production in the year 2020. This increase in the solar and wind power implies very significant financial investments. However, with this huge investment potential and significant increase in generation capacity, there is an additional, often overlooked responsibility: managing the power plants to ensure the lowest total life cycle cost (Life Cycle Cost). Like any standard production system, renewable energy (solar and wind energy in our case) generation components are subject to random failure, which interrupts production and supply of demand. Maintenance is identified as a major cause of accidents, lack of technical know-how of an equipment and the absence of a good maintenance routine plan. As part of the efforts to improve the efficiency and performance of renewable energy power plants, we propose models to optimize the power production and maintenance of our selected case studies (Sokoto solar plant and Katsina wind farm). In this regard, we developed new integrated maintenance policies integrated with production of the energy production from solar and wind energy systems. The preventive maintenance strategy adopted in this thesis is perfect maintenance strategy on the selected components for maintenance and an imperfect selective maintenance on the system (solar PV and wind turbine). Battery shortage in case of under-production and maintenance losses are challenges considered in this study. The methodology we developed entails solving the problem of energy production and maintenance optimization by using the theoretical method as well as machine learning method (ANN and SVM) in order to satisfy a random demand of energy during a finite horizon. We also studied the influence of environmental and operational condition of the systems and then validated the models by numerical examples and sensitivity studies proving the robustness of the developed models
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Milne, Stuart H. "Employer adoption of an HMO option for employees : an integrated institutional and resource dependence perspective." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/28972.
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Zhao, Yongjun. "An Integrated Framework for Gas Turbine Based Power Plant Operational Modeling and Optimization." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/10580.
Abstract:
The deregulation of the electric power market introduced a strong element of competition. Power plant operators strive to develop advanced operational strategies to maximize the profitability in the dynamic electric power market. New methodologies for gas turbine power plant operational modeling and optimization are needed for power plant operation to enhance operational decision making, and therefore to maximize power plant profitability by reducing operations and maintenance cost and increasing revenue.
In this study, a profit based, lifecycle oriented, and unit specific methodology for gas turbine based power plant operational modeling was developed, with the power plant performance, reliability, maintenance, and market dynamics considered simultaneously. The generic methodology is applicable for a variety of optimization problems, and several applications for operational optimization were implemented using this method.
A multiple time-scale method was developed for gas turbine power plants long term generation scheduling. This multiple time-scale approach allows combining the detailed granularity of the day-to-day operations with global (seasonal) trends, while keeping the resulting optimization model relatively compact. Using the multiple timescale optimization method, a profit based outage departure planning method was developed, and the key factors for this profit based approach include power plant aging, performance degradation, reliability deterioration, and the energy market dynamics. A novel approach for gas turbine based power plant sequential preventive maintenance scheduling was also introduced. Finally, methods to evaluate the impact of upgrade packages on gas turbine power plant performance, reliability, and economics were developed, and TIES methodology was applied for effective evaluation and selection of gas turbine power plant upgrade packages.
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Hoyningen-Huene, Wiebke von [Verfasser]. "Essays on integrated maintenance and production scheduling with stochastic failures and non-resumable jobs / Wiebke von Hoyningen-Huene." Kiel : Universitätsbibliothek Kiel, 2015. http://d-nb.info/1075190509/34.
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Abubakar, Aminu Sahabi. "Contribution to the development of new maintenance strategies integrated to control charts for a production process under service levels, operational, and quality constraints." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0055.
Abstract:
L'industrie de la production actuelle est caractérisée par des progrès significatifs : une augmentation massive de la haute technologie, l'émergence de clients exigeants, des marchés compétitifs, une qualité de produit variée et des demandes aléatoires ont exigé la collaboration des aspects interdépendants de la production. La production, la maintenance et la qualité sont les aspects les plus critiques du système industriel. Nous nous intéressons à l'optimisation de la maintenance qui joue un rôle essentiel dans la satisfaction du client, la durabilité et le développement des entreprises. Notre étude est centrée sur le développement de la production et de la maintenance intégrées dans une carte de contrôle de la politique de qualité. Nous proposons de nouvelles stratégies de maintenance intégrée avec une analyse approfondie des améliorations continues de la fiabilité du processus de production et traitées sous les contraintes des exigences du client (Service, qualité et coût). L'intégration et la coordination optimale de ces facteurs de production n'est pas facile et représente un défi pour les entreprises industrielles, et sont plus difficiles avec les causes multi-assignables de la variation du processus de production. Pour répondre à ce problème, ce travail de recherche a utilisé l'outil carte de contrôle en combinaison avec les principes de l'AFNOR connus sous le nom de Règle des sept comme impliqués dans la gestion de la qualité. Pour surveiller, analyser et diriger les actions de maintenance appropriées pour l'amélioration continue de la fiabilité du système le long des différents scénarios de processus multiples comme niveaux de décision. Nous utilisons les interactions entre le processus de production et la qualité du produit pour des stratégies de maintenance qui réduisent la défaillance du système de production en améliorant la fiabilité du processus et en réduisant les produits non conformes. L'étude a porté de manière significative sur la qualité, les outils de qualité et leurs applications dans le contrôle de la production et de la maintenance. La technique que nous avons utilisée pour optimiser la maintenance et le contrôle de la qualité d'un système de production intégré est un outil de carte de contrôle basé sur la mesure et l'analyse statistique des paramètres de qualité. Nous modélisons différents problèmes de production et développons une politique de contrôle pour des systèmes de production à défaillance aléatoire qui doivent satisfaire les exigences des clients de manière dynamique tout au long de l'horizon de production fini. Nous avons introduit un modèle mathématique pour minimiser les coûts totaux de production, d'inventaire, de maintenance et de contrôle de la qualité. L'optimisation de la stratégie de maintenance a été intégrée dans un outil d'information sur les cartes de contrôle. Sur la base de la variation du taux de production et de son impact sur la dégradation de la machine, le nombre de maintenance, les temps et les intervalles nécessaires à une prise de décision prudente sont déterminés par l'algorithme développé. Dans ce contexte, cette recherche présente la dérivation pour différents cas de toutes les probabilités pour le processus d'être dans ou hors de contrôle, les durées moyennes d'exécution, et les durées de cycle de restauration. Sur la base du facteur de dégradation, de nouvelles équations de taux de défaillance sont formulées, puis le taux de défaillance moyen pour chaque cas, nous avons formulé différents modèles d'optimisation des coûts de maintenance. L'approche proposée est utile pour le calcul précis et la minimisation du coût total de maintenance. Elle optimise le coût total de production en considérant tous les états possibles du processus de production dus à des causes multiples. Notre travail contribue à l'émergence de techniques de gestion de la qualité et d'amélioration des performances qui contribueront au développement des entreprises de productionThe current production industry is characterise by significant progress: a massive increase in high technology, the emergence of exigent customers, competitive markets, varied product quality, and random demands required the collaborations of the inter-related aspects of production. The production, maintenance, and quality are the most critical aspects of the industrial system. We are interested in optimising maintenance that plays a critical role in customer satisfaction, sustainability, and the development of companies. Our study is centred on developing production and maintenance integrated into a control chart of quality policy. We propose new integrated maintenance strategies with an in-depth analysis of the continuous production process reliability improvements and treated under customer requirements (Service, quality, and cost) constraints. The integration and optimal coordination of these factors of production is not easy and represent a challenge for industrial companies, and are more challenging with multi-assignable causes of production process variation. To address this problem, this research work employed the use of a control chart tool in combination with the AFNOR principles known as Rule of seven as involved in quality management. To monitor, analyses and direct appropriate maintenance actions for continuous system reliability improvements along the different multiple process scenarios as decision levels. We use the interactions between the production process and product quality for strategies of maintenance which reduce the failure of the production system by improving process reliability and reducing the no conformal products. The study Significantly focused on quality, quality tools, and their applications in production and maintenance control. The technique we used to optimise the maintenance and quality control of an integrated production system is a control chart tool based on statistical measurement and analysis of quality parameters. We model different production problems and develop a control policy for randomly failing production systems that must satisfy customer requirements dynamically throughout the finite production horizon. We introduced a mathematical model to minimise the total costs of production, inventory, maintenance, and quality control. The optimisation of the maintenance strategy was integrated into a control chart tool information. Based on the production rate variation and its impact on machine degradation the number of maintenance, times, and intervals needed for prudent decision-making is determined by the developed algorithm. In this context, this research presents the derivation for different cases of all the probabilities for the process to be in or out of control, the average run lengths, and the restoration cycle durations. Based on the degradation factor, new failure rate equations are formulated, and then the average failure rate for each case, we formulated different maintenance cost optimisation models. The proposed approach is useful for precise calculation and minimisation of the total maintenance cost. Which optimises total production cost considering all possible production process statuses due to multiple causes. Our work contributes to the emergence of quality management and performance improvement techniques that will contribute to the development of production companies
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Bouzoubaa, Maryem. "Stratégies de maintenance intégrée à la production d'énergie dans un parc éolien sous contraintes opérationnelles et environnementales." Electronic Thesis or Diss., Université de Lorraine, 2021. https://docnum.univ-lorraine.fr/public/DDOC_T_2021_0351_BOUZOUBAA.pdf.
Abstract:
À l’échelle mondiale, le développement de parcs éoliens connait une croissance inédite, visible à travers l’augmentation de la puissance éolienne installée annuellement et de la production éolienne mondiale. 2020 a été la meilleure année de l'histoire de l'industrie éolienne mondiale et on estime que l’installation des éoliennes devrait être trois fois plus rapide au cours de la prochaine décennie. Tout système de production d’énergie est sujet à des pannes aléatoires perturbant les plans de production. Le vieillissement, les pannes ainsi que les durées de maintenance sont des exemples de phénomènes aléatoires souvent observés dans ces systèmes. Dans le cas particulier des éoliennes, la nature hautement volatile et incertaine du vent implique que la durée des actions de maintenance doit être minimisée afin de maximiser la disponibilité de l’éolienne et donc sa production énergétique. D’autant plus que les risques liés à la maintenance font de ce celle-ci la cause majeure des accidents survenant dans le secteur éolien. A ceci, s’ajoutent le manque de formation des techniciens de maintenance et l’absence de plan de prévention. Ainsi l’élaboration d’un plan de maintenance est nécessaire, pour optimiser le nombre d’interventions et leur durée et réduire considérablement les conséquences techniques, économiques et humaines liées à ces opérations. La maintenance et la production représentent deux fonctions principales pour tout type de production. Dans la pratique, ces deux fonctions sont souvent gérées séparément malgré qu’elles soient en réalité étroitement liées. En effet, les politiques d’intégration permettent d’améliorer la productivité et de diminuer considérablement les coûts. Dans ce cadre, le travail de recherche proposé dans cette thèse consiste à déterminer de nouvelles politiques de maintenance intégrées à la production d’énergie pour un parc éolien. Deux stratégies de maintenance intégrée ont été testées : parfaite puis combinée imparfaite/sélective avec couplage à la production d’énergie satisfaisant un taux de service tout en tenant compte des contraintes environnementales et opérationnelles et. En effet, pour chaque stratégie développée, le but est de déterminer simultanément un plan de production d’énergie économique et un plan de maintenance optimal minimisant un coût total de production d’énergie et de maintenance. La particularité de cette étude est de considérer l’impact de la variation de production d’énergie sur la dégradation de l’éolienne. Le problème a été modélisé par le développement et l’optimisation de modèles analytiques, puis validé par des exemples numériques et des études de sensibilité prouvant la robustesse des modèles analytiques développésGlobally, the development of wind farms is experiencing exceptional growth, visible through the increase of wind power installed annually and global wind power production. 2020 was the best year in the history of the global wind industry and it is estimated that wind turbine installation should grow three times faster over the next decade. Any energy production system is subject to random breakdowns which trouble production plans. Aging, breakdowns and maintenance times are examples of random phenomena often observed in those systems. In the particular case of wind turbines, the highly volatile and uncertain nature of the wind means that the duration of maintenance actions must be minimized in order to maximize the availability of the wind turbine and therefore its energy production. In addition to this, the risks associated with maintenance make it the major cause of accidents in the wind energy sector. Considering the lack of training for maintenance technicians and the absence of a prevention plan, a maintenance plan optimizing the number of interventions and their duration and considerably reducing the technical, economic and human consequences linked to these operations is essential. Maintenance and production are two main functions for any type of production. In practice, these two functions are often managed separately despite being in reality so close. Indeed, integration policies can improve productivity and reduce costs considerably. In this context, the research work proposed in this thesis consists in determining new maintenance policies integrated into energy production for a wind farm. Two integrated maintenance strategies were tested: perfect then combined imperfect / selective coupled to energy production, satisfying a service rate while taking into account environmental and operational constraints and. Indeed, for each strategy developed, the goal is to simultaneously determine an economical energy production plan and an optimal maintenance plan minimizing a total cost of energy production and maintenance. The particularity of this study is to consider the impact of the variation in energy production on the degradation of the wind turbine. The problem was modeled by the development and optimization of analytical models, then validated by numerical examples and sensitivity studies proving the robustness of the analytical models developed
45
Suchomel, Bruce Richard. "A strategic analysis of budgeting for integrated logistical support of defense systems." CSUSB ScholarWorks, 1991. https://scholarworks.lib.csusb.edu/etd-project/578.
46
Reasor, Roderick. "A decision support system for integrated design analysis of a repairable item and it's logistic support system." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07102007-142510/.
47
Barroso, Rafael. "Diminuição do tempo em manutenção preventiva em uma frota de caminhões de uma mineração de grande porte: uma discussão baseada na manutenção produtiva total." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-08032019-114508/.
Abstract:
Por estar diretamente sujeita a fatores econômicos de nível global, a mineração tende a se desenvolver para buscar processos produtivos mais enxutos, aliando menores custos operacionais a melhores taxas produtivas. Neste contexto, o objetivo principal deste trabalho é avaliar o comportamento geral da curva de tempo em manutenção preventiva de uma frota de caminhões em uma mineração de grande porte, sendo a análise realizada em uma janela temporal baseada em um período econômico de mínimo local nos preços do cobre. A partir do comportamento observado é feita uma discussão sob as premissas da metodologia de gestão nomeada Manutenção Produtiva Total de forma a se debater os possíveis principais riscos e/ou consequências que podem ser enfrentadas pelo projeto e como estas decisões qualitativamente indicam o grau de maturidade na integração operacional entre produção e manutenção em um projeto minerário. Ao final, pode-se concluir que ainda é necessário um intenso trabalho em se traduzir as premissas da MPT para a indústria mineral, buscando-se adaptar processos e métricas que sejam mais condizentes ao ambiente da indústria extrativa (que é muito diferente da indústria de manufatura, onde o programa teve início). Além disso, fica claro que a aplicação da MPT é possível e bem-vinda na mineração já havendo de vários estudos acadêmicos na área - ou seja, o ponto em questão mais desafiador provavelmente é que seja desenvolvido um programa de MPT de forma endógena em um projeto mineral.As it is directly under global economic factors, the mining industry tends to develop to seek leaner production processes, combining lower operational costs to better productive rates. In this context, the main objective of this study is to evaluate the general behavior of the time spend in preventive maintenance of a truck fleet from a large-scale mining project, being the analysis performed in a time window based on an economic period of local minimum in copper prices. From the observed behavior a discussion is made under the assumptions of the management methodology named Total Productive Maintenance in order to discuss the possible main risks and/or consequences that can be faced by the project and how these decisions qualitatively indicate the degree of maturity between production and maintenance in a mining project. In the end, it can be concluded that an intense work is still needed to translate the TPM premises into the mineral industry, being necessary to seek ways to adapt processes and metrics that are more suited to the extractive industry environment (which is very different from the manufacturing industry, where the program started). In addition, it is clear that the application of TPM is possible and welcome in mining since there are several academic studies in the area - in other words, the most challenging point in question is probably that an endogenous TPM program is developed within a mineral project.
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Thaesler-Garibaldi, Maria P. "A methodology to Develop an Integrated Engineering System to Estimate Quantities for Bridge Repairs at the Pre-Design Stage." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6915.
Abstract:
A Damage Assessment Model, Construction Process Model and Parametric Quantity Model were developed with the purpose of capturing the engineering knowledge involved in the estimating process of bridge repair construction projects.
The Damage Assessment Model was used to create a sample database in which detailed inspection data was stored in a format compatible with the existing Pontis?tabase. Detailed inspection data, which provided quantitative values for the different damage types observed in bridges, could be retrieved from the sample database so that data could be used as either input parameters in the knowledge rules that triggered the selection of construction tasks in the Construction Process Model, or data could be used as variables in the equations used to estimate quantities in the Parametric Quantity Model.
The Construction Process Model was used to incorporate the logic behind the construction process for different repair methods. The Construction Process Model was composed of seven repair matrices that defined specific repair methods for each Pontis?idge element. Construction tasks were grouped in construction modules that were modeled as flowcharts. Each construction module flowchart was composed of construction tasks arranged in sequential order and decision points that triggered the selection of construction tasks based on input parameters and knowledge rules. Input parameters were provided by the user, retrieved from the model or pre-defined in the model by expert knowledge. The construction modules developed involved construction tasks related to the repair of concrete bridge piles that were damaged due to reinforcement corrosion and related concrete deterioration. Data describing the construction tasks that were considered in the construction module flowcharts were modeled using the entity-relationship model and were stored in the sample database described previously.
The Parametric Quantity Model combined data generated by the Damage Assessment Model and the Construction Process Model with additional expert knowledge and parameters into equations that were used to estimate quantities.
The author investigated the use of neural networks as a tool to predict actual damage in bridge piles, conducted a preliminary survey to define labor productivity factors and collected data to define the duration of construction activities related to bridge repair.
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Aronsson, Linus. "Integrerat brounderhåll." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Byggnadsteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-22560.
Abstract:
Trafikverket ansvarar för det statliga vägnätet i Sverige. Vägnätet består av cirka 15 500 broar som ständigt utsätts för olika former av nedbrytning. Broarna behöver därför underhållas med jämna mellanrum både för att hålla broarna i ett bra skick och för att motverka att nedbrytningen påskyndas. Under de senare åren har Trafikverket utformat en ny upphandlingsmetod av brounderhåll. Den går ut på att allt brounderhåll för en region paketeras, i ett s.k. brounderhållspaket, som en entreprenör sköter i en femårig period. I brounderhållspaketen ingår förebyggande underhåll, avhjälpande underhåll och akut underhåll. Syftet med det här arbetet är att följa upp den nya formen att upphandla brounderhåll i paket. Målet är att tydliggöra vilka vinster, eller förluster, som gjorts i effektivitet i hela kedjan sedan införandet av brounderhåll i paket. De metoder som använts vid skapandet av examensarbetet är litteraturstudier, möten och intervjuer samt analyser, beräkningar och jämförelser. Resultatet visar hur beställare, entreprenör och konsult arbetar i brounderhållspaket och vad som har förändrats jämfört med hur de arbetade med brounderhåll tidigare. De största effektivitetsvinsterna är administrativa. Genom att brounderhållspaketen är en totalentreprenad läggs mycket av ansvaret över från beställaren till entreprenören och därmed får beställaren tid till andra arbetsuppgifter. Eftersom brounderhållet numera ligger i eget kontrakt som löper under en längre tid får beställaren också en kunnig entreprenör till arbetet vilket minskar antalet grundläggande frågor och frigör tid. Entreprenören får mer frihet när arbetena skall utföras och samtidigt mer tid till att planera underhållsarbetet. Genom en tät kommunikation mellan beställare och entreprenör blir beslutsvägarna kortare vilket effektiviserar hela kedjan. Skaraborgspaketet var ett av de första brounderhållspaketen och det skiljer sig mycket från de senare underhållspaketen. Den största förändringen ligger i förfrågningsunderlagen. Skaraborgspaketet utgick från en fiktiv bro medan förfrågningsunderlagen i de nyare paketen behandlar verkliga åtgärder som entreprenören kommer att utföra under den kontrakterade tiden.Trafikverket is responsible for the public traffic network in Sweden. The traffic network contains around 15 500 bridges that constantly are exposed of different kinds of degradation. The bridges must therefore be maintained at regular intervals both to keep bridges in good condition and to prevent the degradation accelerated. During the last years Trafikverket has developed a new procurement method of bridge maintenance. The method involves that all bridges maintenance of a region is being bundled to one contract that an entrepreneur handles for five years, a socalled bridge maintenance package. A bridge maintenance package exists of preventive maintenance, remedial maintenance and emergency maintenance. The purpose of this paper is to follow up the new form to procure bridge maintenance in package. The goal is to clarify the gains or losses made in efficiency since the introduction of bridge maintenance in package. Methods used in the creating of this thesis are literary studies, meetings and interviews along with analysis, calculations and comparisons. The result lays the foundation for the client, contractor and consultant working in the bridge maintenance package and further what has changed from the way they were working on bridge maintenance earlier. The largest efficiency gains are administrative. Because a bridge maintenance package is a turnkey contract the majority of responsibility is put on the contractor, instead of the client, which gives the client time for other tasks. Nowadays the bridge maintenance is in a separate contract which lasts for a longer time which gives the client a more qualified contractor for that kind of work which is reducing the number of fundamental questions and gives the client extra time. The contractor will get more operating freedom and at the same time more time to plan maintenance work. Through frequent communication between client and contractor decision-making paths becomes shorter which gives more efficiency throughout the entire process. The package in the region Skaraborg was one of the first bridge maintenance packages and it differs a lot from later maintenance packages. The biggest difference is in the contract documents. The package in Skaraborg was based on a fictional bridge while the more recent maintenance packages documents addresses the real action which the contractor will perform during the contracted period.
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Milana, Milana. "The Development of a Hybrid Knowledge-Based System for Integrated Maintenance Strategy and Operations in an Automotive Industry Environment: The Development of a Hybrid Knowledge-Based (KB) System/ Gauging Absences of Pre-Requisites (GAP)/Analytic Hierarchy Process (AHP) Methodology for Integrated Maintenance Strategy and Operations in an Automotive Industry Environment." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17446.
Abstract:
The dependency of maintenance as a manufacturing logistic function has made
the considerations of maintenance decisions complex in nature. The importance
of maintenance has escalated significantly by the increasing of automation in
manufacturing processes. This condition switches the traditional maintenance
perspective of “fire-fighter” into the business competitive driver. As a
consequence, maintenance needs to consider other related aspects of decision
making to achieve competitive advantage.
This research aims to develop a hybrid Knowledge-Based (KB)
System/GAP/AHP methodology to support the integration of maintenance
decision with business and manufacturing perspectives. It constructs over 2000
KB rules on Strategic Stage (business and manufacturing aspects) and
Maintenance Operations Stage (maintenance aspects). Each aspect contains
KB rules attached with GAP analysis to assess the gap between current and
prerequisite condition. AHP analysis is then deployed to compare those aspects
structurally in a pair-wise manner to identify the critical ones to be rectified. This
hybrid KB system is useful in reviewing the existing maintenance system
performance and provides reasonable recommendations to improve
maintenance performance with respect to business and manufacturing
perspectives. Eventually, it indicates the roadmap from the current state to the
benchmark goals for the maintenance system.
This novel methodology of KBS/GAP/AHP to support maintenance decision is
developed for a particular application in the automotive environment. The
validation is conducted in two automotive companies in Indonesia and one
published case study in an automotive company. The result confirms that the
developed KB system can provide the valid, reasonable and consistent result to
propose structured recommendation for maintenance improvement priority.