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Dissertations / Theses on the topic 'Maintenance – Mathematical models'

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Published: 4 June 2021

Last updated: 10 February 2022

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1

Harris, David Wayne. "A degradation analysis methodology for maintenance tasks." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/24867.

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2

BONKAT, BARNABAS NANPAK. "ANALYTICAL PROCEDURE FOR EVALUATING ROADWAY UPGRADING STRATEGY FOR LOW-VOLUME HIGHWAYS." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187926.

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The purpose of this research was to develop a simplified analytical procedure for determining the optimal timing for upgrading low-volume roads in developing countries. Most roadway upgradings from gravel to surface treated and to asphaltic concrete are carried out when total transport cost on a road becomes high as a result of high traffic and the consequent rapid deterioration of the roadway. Adequate timing of upgrading strategies ensures effective use of resources and lower total transport cost. This study examined existing systems, models, and approaches for estimating total transport cos

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3

Lettovsky, Ladislav. "Airline operations recovery : an optimization approach." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/24326.

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4

Keller, Benjamin J. "An algebraic model of software evolution." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040841/.

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5

Smith, Ernest Price. "An optimal replacement-design model for a reliable water distribution network system." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/37455.

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6

Koh, Yeow Leung 1976. "In-situ structural health monitoring of composite repair patches." Monash University, Dept. of Mechanical Engineering, 2002. http://arrow.monash.edu.au/hdl/1959.1/7698.

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7

Khorram, E. "Some developments in the machine interference problem : Investigation of models for machine maintenance problems involving inhomogeneous and regularly patrolled machines, with applications to the textile industry." Thesis, University of Bradford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234254.

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8

Moore, Thomas P. "Optimal design, procurement and support of multiple repairable equipment and logistic systems." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/71158.

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A concept for the mathematical modeling of multiple repairable equipment and logistic systems (MREAL systems) is developed; These systems consist of multiple populations of repairable equipment, and their associated design, procurement, maintenance, and supply support. MREAL systems present management and design problems which parallel the·management and design of multiple, consumable item inventory systems. However, the MREAL system is more complex since it has a repair component. The MREAL system concept is described in a classification hierarchy which attempts to categorize the components

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9

Zhu, Wenjin. "Maintenance of monitored systems with multiple deterioration mechanisms in dynamic environments : application to wind turbines." Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0005/document.

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Les travaux présentés contribuent à la modélisation stochastique de la maintenance de systèmes mono- ou multi-composants à détériorations et à modes de défaillances multiples en environnement dynamique. Dans ce cadre, les contributions portent d'une part sur la modélisation des processus de défaillance, et d'autre part sur la proposition de structures de décision de maintenance intégrant les différents types d'information de surveillance en ligne disponible sur le système (état de détérioration mesuré ou reconstruit, état de l'environnement, ...) et le développement des modèles mathématiques d

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10

Salazar, Kardozo Alexandros. "A High-Level Framework for the Autonomous Refueling of Satellite Constellations." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14534.

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Satellite constellations are an increasingly attractive option for many commercial and military applications. They provide a robust and distributed method of accomplishing the goals of expensive monolithic satellites. Among the many challenges that satellite constellations engender (challenges in control, coordination, disposal, and other areas), refueling is of particular interest because of the many methods one can use to refuel a constellation and the lifetime implications on the satellites. The present work presents a methodology for carrying out peer-to-peer refueling maneuvers within a

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11

Li, Heping. "Condition-based maintenance policies for multi-component systems considering stochastic dependences." Thesis, Troyes, 2016. http://www.theses.fr/2016TROY0030/document.

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De nos jours, les systèmes industriels sont de plus en plus complexes tant du point de vue de leur structure logique que des diverses dépendances (dépendances économique, stochastiques et structurelles) entre leurs composants qui peuvent influencer l'optimisation de la maintenance. La Maintenance conditionnelle qui permet de gérer les activités de maintenance en fonction de l’information de surveillance a fait l’objet de beaucoup d'attention au cours des dernières années, mais les dépendances stochastiques sont rarement utilisées dans le processus de prise de décision. Par conséquent, cette th

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12

Nguyen, Kim Anh. "Développement de stratégies de maintenance prévisionnelle de systèmes multi-composants avec structure complexe." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0027/document.

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Aujourd'hui, les systèmes industriels deviennent de plus en plus complexes. Cette complexité est due d’une part à la structure du système qui ne se résume pas à des structures classiques en fiabilité, d’autre part à la prise en compte de composants présentant des phénomènes de dégradation graduelle que des systèmes de monitoring permettent de surveiller. Ceci mène à l'objectif de cette thèse portant sur le développement des stratégies de maintenance prévisionnelle pour des systèmes multi-composants complexes. Les politiques envisagées proposent notamment des stratégies de regroupement de compo

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13

Collins, Fred C. "Evaluation of a repairable equipment population system and its logistics support subsystem." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10062009-020124/.

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14

Lin, TsungPo. "An adaptive modeling and simulation environment for combined-cycle data reconciliation and degradation estimation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24819.

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Thesis (Ph.D.)--Aerospace Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Dimitri Mavris; Committee Member: Erwing Calleros; Committee Member: Hongmei Chen; Committee Member: Mark Waters; Committee Member: Vitali Volovoi.

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15

Vu, Hai Canh. "Stratégies de regroupement pour la maintenance des systèmes à composants multiples avec structure complexe." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0008/document.

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Au cours des dernières décennies, avec un fort développement de l'économie mondiale et des nouvelles technologies, la structure des systèmes industriels devient de plus en plus complexe. Elle peut être une combinaison des structures élémentaires telles que structures séries, structures parallèles, structures séries-parallèles, etc. Dans la littérature, la plupart des travaux s'intéressent à développer des stratégies de regroupement en considérant des structures séries. Cette hypothèse est parfois très pénalisée et se limite l'application de ces stratégies dans la réalité. C'est pourquoi, l'obj

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16

Nguyen, Danh Ngoc. "Contribution aux approches probabilistes pour le pronostic et la maintenance des systèmes contrôlés." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0010/document.

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Les systèmes de contrôle-commande jouent un rôle important dans le développement de la civilisation et de la technologie moderne. La perte d’efficacité de l’actionneur agissant sur le système est nocive dans le sens où elle modifie le comportement du système par rapport à celui qui est désiré. Cette thèse est une contribution au pronostic de la durée de vie résiduelle (RUL) et à la maintenance des systèmes de contrôle-commande en boucle fermée avec des actionneurs soumis à dégradation. Dans une première contribution, un cadre de modélisation à l'aide d’un processus markovien déterministe par m

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17

Pereira, Andre Flavio Soares. "Planejamento da operação energetica e da manutenção no sistema hidrotermico de potencia brasileiro." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264637.

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Orientadores: Sergio Valdir Bajay, Paulo Sergio Franco Barbosa<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-08T23:23:08Z (GMT). No. of bitstreams: 1 Pereira_AndreFlavioSoares_M.pdf: 1792951 bytes, checksum: a865e5b33783ba4a8f044bcff70f9809 (MD5) Previous issue date: 2006<br>Resumo: Nesta dissertação se avalia o estado da arte do planejamento da operação energética e da manutenção de usinas em sistemas hidrotérmicos de potência e se propõe algumas inovações. Neste contexto, se faz uma revisão crítica das

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18

Trudel, Mathieu. "A Mathematical Model for Winter Maintenance Operations Management." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/898.

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Scheduling of winter maintenance operations such as plowing or salting is a difficult and complex problem. Proper selection and timing of such operations is critical to their effectiveness, however scheduling decisions must often be made with strict time and resource limitations imposed upon them. A decision support system which analyses current road conditions and makes scheduling suggestions based on them would be a valuable step toward improving the quality of treatment, while simultaneously reducing the burden of scheduling on maintenance managers. This thesis proposes a real-tim

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19

Khalaf, Abdelbaset Abdelrahem. "Evidence based mathematical maintenance model for medical equipement." Versailles-St Quentin en Yvelines, 2012. http://www.theses.fr/2012VERS0036.

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Bien que la maintenance des équipements médicaux a été bien planifiée et exécutée depuis plus de 30 ans, très peu d'études ont été menées pour mesurer et évaluer son efficacité en termes de fiabilité et de disponibilité pour la prestation des services. Le débat en cours, en ingénierie clinique, est de savoir si la maintenance préventive est effectivement nécessaire et, si oui à quelle fréquence et quelles tâches doivent être effectuées. Une approche de modélisation mathématique est utilisée pour analyser la probabilité de survie de divers équipements médicaux. Cette approche permet d'explorer

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20

Fouathia, Ouahab. "Stratégie de maintenance centrée sur la fiabilité dans les réseaux électriques de haute tension." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211003.

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Aujourd’hui les réseaux électriques sont exploités dans un marché dérégulé. Les gestionnaires des réseaux électriques sont tenus d’assurer un certain nombre de critères de fiabilité et de continuité du service, tout en minimisant le coût total consacré aux efforts effectués pour maintenir la fiabilité des installations. Il s’agit de trouver une stratégie, qui répond à plusieurs exigences, comme :le coût, les performances, la législation, les exigences du régulateur, etc. Cependant, le processus de prise de décision est subjectif, car chaque participant ramène sa contribution sur base de sa pro

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21

Burnett, Sulene. "A simplified numerical decision making toolbox for physical asset management decisions." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85626.

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Thesis (MEng)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: The management of physical assets has become a popular eld of study over recent years and is being acknowledged in multiple disciplines world wide. In this project, research on Physical Asset Management (PAM), maintenance and decision making are presented. PAM is a complex subject and requires the participation of multiple disciplines in order to successfully manage physical assets. Moreover, the management of maintenance makes a big contribution in achieving successful PAM. Decision making is a core element to manage m

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22

Patrick-Aldaco, Romano. "A Model Based Framework for Fault Diagnosis and Prognosis of Dynamical Systems with an Application to Helicopter Transmissions." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16266.

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The thesis presents a framework for integrating models, simulation, and experimental data to diagnose incipient failure modes and prognosticate the remaining useful life of critical components, with an application to the main transmission of a helicopter. Although the helicopter example is used to illustrate the methodology presented, by appropriately adapting modules, the architecture can be applied to a variety of similar engineering systems. Models of the kind referenced are commonly referred to in the literature as physical or physics-based models. Such models utilize a mathematical descr

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23

Szedlmayer, Margaret Mary Anne. "Simulation Model for Repairable Parts Inventories at a Maintenance Center." W&M ScholarWorks, 1987. https://scholarworks.wm.edu/etd/1539720318.

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24

Slack, Sean Edward. "Essays on categorical and universal welfare provision : design, optimal taxation and enforcement issues." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/15659.

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Part I comprises three chapters (2-4) that analyse the optimal combination of a universal benefit (B≥0) and categorical benefit (C≥0) for an economy where individuals differ in both their ability to work and, if able to work, their productivity. C is ex-ante conditioned on applicants being unable to work, and ex-post conditioned on recipients not working. In Chapter 2 the benefit budget is fixed but the test awarding C makes Type I and Type II errors. Type I errors guarantee B > 0 at the optimum to ensure all unable individuals have positive consumption. The analysis with Type II errors depend

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25

Ben, Houria Zeineb. "Optimisation de la gestion du service de maintenance biomédicale." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES057/document.

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Le milieu hospitalier est un monde à la fois sensible et complexe, sensible parce que la vie humaine est en jeu et complexe parce que les équipements médicaux augmentent en nombre et en complexité technique. Ainsi, afin de préserver le bon état de fonctionnement de ces équipements et à un niveau élevé de disponibilité, leur entretien est devenu l'une des préoccupations majeures des responsables de l’hôpital. L’objectif de cette thèse est de proposer, aux responsables de maintenance biomédicale dans les établissements de soins, des outils d’aide à la décision qui permettent une meilleure maitri

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26

Milroy, Scott P. "A three-dimensional biophysical model of light, nutrient, and grazing controls on phytoplankton competition affecting red tide maintenance on the west Florida shelf." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002068.

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27

Brännmark, My, and Ellen Fors. "Modellering av åtgärdsintervall för vägar med tung trafik." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160057.

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In Sweden, there has been an long term effort to allow as heavy traffic as possible, provided thatthe road network can handle it. This is because heavy traffic offers a competitive advantage withsocio-economic gains. In July 2018, the Swedish Transport Administration made 12 percent ofthe Swedish road network avaliable for the new maximum vehicle weight of 74 tonnes, basedon a legislative change from 2017. It is known that heavy traffic has a negative effect on thedegradation of the road, but it prevails divided opinions on whether 74 tonnes have a greaterimpact on the degradation rate compare

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28

"Maintenance model and warranty problem." 2000. http://library.cuhk.edu.hk/record=b5890271.

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Tse Yee Kit.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2000.<br>Includes bibliographical references (leaves 55-58).<br>Abstracts in English and Chinese.<br>Chapter Chapter 1 --- Introduction<br>Chapter 1.1 --- Geometric Process and Maintenance Problem --- p.1<br>Chapter 1.2 --- Warranty Problem --- p.5<br>Chapter 1.3 --- An Outline of the Thesis --- p.8<br>Chapter Chapter 2 --- Multistate Deteriorative System<br>Chapter 2.1 --- The Multistate Model --- p.10<br>Chapter 2.2 --- Long-run Average Cost Per Unit Time --- p.15<br>Chapter 2.3 --- The Optimal Policy N* --- p.18<br>Cha

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29

Armstrong, Michael John. "Reliability and maintenance for interrelated systems." Thesis, 1996. http://hdl.handle.net/2429/6241.

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In this paper we consider three topics in reliability and maintenance. Their common feature is the explicit consideration of interdependence, either amongst components within a machine, amongst stages in a logistics chain, or amongst machines sharing maintenance facilities. Chapter 1 examines measures of the contribution of a component towards a system's reliability; these measures include structural importance, marginal reliability importance, joint reliability importance, and link importance. We review these different measures and examine how they relate to each other. We show that so

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30

"A general inspection-repair-replacement model for systems with unobservable states." Chinese University of Hong Kong, 1996. http://library.cuhk.edu.hk/record=b5888991.

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by Siu-Keung Wan.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1996.<br>Includes bibliographical references (leaves 69-70).<br>Chapter Chapter 1 --- Introduction and Review<br>Chapter 1.1 --- Introduction --- p.1<br>Chapter 1.2 --- Review --- p.3<br>Chapter Chapter 2 --- A general IRR model for a system with unobservable states<br>Chapter 2.1 --- Model and assumptions --- p.8<br>Chapter 2.2 --- Long-run average cost per unit time incurred in a replacement cycle --- p.14<br>Chapter Chapter 3 --- The Algorithm<br>Chapter 3.1 --- The key point and the local turning point of the avera

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31

"Optimal policies in warranty and maintenance problems." 1997. http://library.cuhk.edu.hk/record=b5889260.

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by Kwok-wai Lam.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1997.<br>Includes bibliographical references (leaves 88-90).<br>Declaration --- p.iii<br>Acknowledgment --- p.iv<br>Abstract --- p.v<br>Chapter Chapter 1 --- Overview --- p.1<br>Chapter Chapter 2 --- Extended Warranty Policy --- p.7<br>Chapter 2.1 --- Introduction --- p.7<br>Chapter 2.2 --- One Cycle Model --- p.9<br>Chapter 2.2.1 --- Expected cost to Consumer and Manufacturer --- p.12<br>Chapter 2.2.2 --- Optimal Warranty Policy to Consumer --- p.15<br>Chapter 2.2.3 --- Optimal Warranty Policy to Manufacturer ---

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32

Cai, Yiwei. "Semiconductor manufacturing inspired integrated scheduling problems : production planning, advanced process control, and predictive maintenance." 2008. http://hdl.handle.net/2152/17950.

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This dissertation is composed of three major parts, each studying a problem related to semiconductor manufacturing. The first part of the dissertation proposes a high-level scheduling model that serves as an intermediate stage between planning and detailed scheduling in the usual planning hierarchy. The high-level scheduling model explicitly controls the WIP over time in the system and provides a more specific guide to detailed scheduling. WIP control is used to balance the WIP (Work In Process) level and to keep the bottleneck station busy to maintain a high throughput rate. A mini-fab simula

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33

Foong, Wai Kuan. "Ant colony optimisation for power plant maintenance scheduling." 2007. http://hdl.handle.net/2440/47786.

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Maintenance of power plants is aimed at extending the life and reducing the risk of sudden breakdown of power generating units. Traditionally, power generating units have been scheduled for maintenance in periods to ensure that the demand of the system is fully met and the reliability of the system is maximized. However, in a deregulated power industry, the pressure of maintaining generating units is also driven by the potential revenue received by participating in the electricity market. Ideally, hydropower generating units are required to operate during periods when electricity prices are hi

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34

"Can the use of RPM be justified without services?" 2015. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1291555.

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Regarding most law cases of resale price maintenance (RPM), non-pricing strategies (mostly termed ”services”) that were first brought by Tesler (1960) are usually applied to justify RPM. However, if cases are rarely involved with non-pricing strategies or the significance of services is hard to judge, it would be difficult for lawyers to defend for RPM under the traditional services framework. This paper addresses this problem using a model with one manufacturer and two retailers. The retailers choose their own prices but nothing else. If retailers differ, the model can generate equilibria– on

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35

Kwon, Gun Up 1977. "Strengthening existing steel bridge girders by the use of post-installed shear connectors." 2008. http://hdl.handle.net/2152/18079.

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A number of older bridges built before the 1970’s were constructed with floor systems consisting of a non-composite concrete slab over steel girders. Many of these bridges do not satisfy current load requirements and may require replacement or strengthening. A potentially economical means of strengthening these floor systems is to connect the existing concrete slab and steel girders to permit the development of composite action. This dissertation describes a research program investigating methods to develop composite action in existing non-composite floor systems by the use of postinstalled sh

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36

Khalaf, Abdelbaset Abdelrahem. "Evidence-based mathematical maintenance model for medical equipment." 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000597.

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D. Tech. Electrical Engineering.<br>Aims to develop a mathematical maintenance model for medical equipment for the purpose of analysing maintenance strategies to optimise maintenance of medical equipment.

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