Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Maintenance policies"”.
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A Bivariate Renewal Process and Its Applications in Maintenance Policies
… pursue a bivariate approach in reliability and maintenance modeling. This research presents a framework for bivariate modeling of a single-unit system. Five key efforts are identified and organized as: (i) bivariate failure modeling, (ii) bivariate renewal modeling, (iii) bivariate corrective …
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Maintenance strategies affecting equipment performance
Proper maintenance of plant items is crucial for the safe and profitable operation of process plants, The relevant maintenance policies fall into the following four categories: (i) preventivejopportunistic/breakdown replacement policies, (ii) inspection/inspection-repair-replacernent policies, …
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Assessment of Dynamic Maintenance Management
… which can directly affect human lives. The maintenance system plays an important role in achieving higher performance targets. In order to manage maintenance activities in more informed and rational manner, it is very important to understand the inherently complex and dynamic structure of …
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The Effect of Maintenance Policy on System Maintenance and System Life-Cycle Cost
… (simulation) model that evaluates the effect of maintenance policies on system performance and life-cycle cost. The model highlights factors such as learning, aging and the technological upgrades that occur during the life-cycle of a system. The metrics used to measure the effectiveness of …
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Modeling And Characterizations Of New Notions In Life Testing With Statistical Applications
… study of reliability theory, survival analysis, maintenance policies, economics, actuarial sciences and many other applied areas.
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Design and implementation of a hardware reliability simulator for multiple component systems.
… that it performs the intended task. Complex maintenance policies have not previously been modelled in detail by reliability assessment techniques. The features of maintenance policies important to reliability assessment are identified and are included in the algorithm for SPRINT II. The …
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Optimal inspection and maintenance for stochastically deteriorating systems
This thesis concerns the optimisation of maintenance and inspection for stochastically deteriorating systems. The motivation for this thesis is the problem of determining condition based maintenance policies, for systems whose degradation may be modelled by a continuous time stochastic process. Our …
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Spacecraft and Propulsion Technician Error
… the U.S. government has not established maintenance policies for commercial space. This study conducted a mixed methods review of 610 U.S. space launches from 1984 through 2011, which included 31 failures. An analysis of the failure causal factors showed that human error accounted for 76% …
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Ikriya: Simulating Software Quality Enhancement With Selected Replacement Policies
… the consequences of various development and maintenance policies which might be applied.These depend on the state of existing software portfolio, the queue and properties of proposed projects, and the resources available. Optimal decisions are made by the simulator by taking the above …
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Optimal depot level maintenance planning
… planning and management of costly depot- level maintenance for the MiAl is of concern to the Marine Corps. However, there is currently no model or other management tool available to analyze the effects of various maintenance policies. The goal of this thesis is to develop such a model to aid the …
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Confiabilidade e política de manutenção aplicadas a sistemas de máquinas de plataformas offshore
The work consists in the determination of maintenance tasks that must be scheduled and carried out, based on the study and analysis of the history of failures and repairs of machine systems, considering a reliability study. The objective is to be able to establish the maintenance policies …
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A simulation-based decision support system for finite population maintenance logistics
… system, MAINTAIN, that was developed to assist maintenance and logistics planners in the evaluation of alternative strategies that might be used in the maintenance of a finite population of end items. The modeled population must consist of a finite number of identical end items, each at age zero …
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Addressing the Reliability and Life Cycle Cost Analysis Problem for Technology and System Developers Early in the DoD System Development Process
… to be insensitive to changes in preventative maintenance policies, maintenance deferment ratios, and component replacement cost. We completed verification and validation using the case study and existing Marine Corps systems, finding good association between the modeling results and the actual …
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The development of an intelligent maintenance optimisation system
… system (DSS) known as IMOS, the intelligent maintenanceoptimisation system. The aim of the system is to help industrial maintenanceengineers improve the planned preventive maintenance policies applied to large andcomplex technical systems. IMOS attempts to achieve this by providing …
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Multi-objective system optimisation with respect to availability, maintainability and cost
… is by designing the system with preventive maintenance (PM) in mind. A well articulated PM policy can reduce the occurrence of system failure, thereby improving dependability attributes such as safety, reliability and availability as well as cost.In a typical scenario, components of the …
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Reliability Analysis And Optimal Maintenance Planning For Repairable Multi-Component Systems Subject To Dependent Competing Risks
… reliability models and scheduling optimal maintenance plans for multi-component repairable systems, however, is still a big challenge when considering the dependency of component failures. Existing models commonly make prior assumptions, without statistical verification, as to whether …
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Statistical Hierarchical Modelling for Industrial Collaborative Prognosis
… for the emerging highly-flexible predictive maintenance policies. The original equipment owners and customers also mutually enjoy its cost benefits via servitisation for example, where the customers pay for asset uptimes rather than ownerships. Such business offerings are possible only due to …
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An integrated performance model learning and planning approach for optimal infrastructure facility maintenance under partial observability
Infrastructure inspection and maintenance decision making is a stochastic and partially observable problem. This thesis presents a learning and decision-making approach for developing optimal joint inspection and maintenance policies for civil infrastructure facilities under performance model …
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Optimización estocástica del mantenimiento de sistemas de transporte y secado de sustancias minerales
… of this thesis is the optimization of the maintenance of a transport and drying system. The maintenance variables have been treated as a control variable in a dynamic model. This model integrates operational and reliability parameters and allows for the optimization of the maintenance …
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Designing a maintenance management system for a small to medium sized manufacturing plant
… thet the quality of service provided by the maintenance department has become a cornerstone of profitability. The idea of a Maintenance Management System is not a new one and considerable research has been carried out on various facets of the subject. However, it appears that much of this …
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