Results 211 to 220 of about 22,134 (266)

OPTIMAL AGE-DEPENDENT PREVENTIVE MAINTENANCE POLICIES WITH IMPERFECT MAINTENANCE

International Journal of Reliability, Quality and Safety Engineering, 1996
This paper proposes three age-dependent preventive maintenance models with imperfect repair and/or imperfect preventive maintenance (pm). In these models imperfect repair is treated in a way that after repair the lifetime of a unit will decrease to a fraction of its immediately previous one and its repair time will increase to a multiple of ...
HONGZHOU WANG, HOANG PHAM
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Optimal lot-sizing problem with imperfect maintenance and imperfect production

International Journal of Systems Science, 2004
In this paper, we develop an integrated model for the joint determination of both economic production quantity and level of preventive maintenance (PM) for an imperfect production process. This process has a general deterioration distribution with increasing hazard rate.
Shey-Huei Sheu, Jih-An Chen
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Sequential imperfect preventive maintenance policies

IEEE Transactions on Reliability, 1988
This paper introduces improvement factors in hazard rate and age for a sequential preventive maintenance (pm) policy and analyzes two imperfect pm models: 1) pm reduces the hazard rate while it increases with the number of pm's and 2) pm reduces the age. The pm is done at intervals \(x_ k\) \((k=1,2,...,N)\) and is imperfect.
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Effective age models for imperfect maintenance

Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 2011
A large number of maintenance models are available in the literature. Most of these usually assume that the effect of maintenance interventions is as good as new. This amounts to assuming the maintenance action undergone by a system, be it preventive or corrective, is equivalent to its replacement.
P-E Labeau, M-C Segovia
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On an imperfect preventive maintenance model

International Journal of Quality & Reliability Management, 2000
Presents two sequential preventive maintenance (PM) models. The first model can be viewed as an extension of Nakagawa’s model where the age reduction of the system is assumed to depend on the level of PM activities. Linear and nonlinear relationships between age reduction and PM level have been considered.
M. Ben‐Daya, A.S. Alghamdi
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Two alternative imperfect multiaction maintenance models

Engineering Optimization, 2003
Systems such as civil structures ( e.g. building and bridges) and man-machine-software ( e.g. large servers and control systems) can be categorised into certain operational states with respect to the structural conditions. Different operational states result in different abilities to perform the given missions and different system failure rates.
Chih-Hung Tsai, Cheng-Chang Chang
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Maintenance policies under imperfect information

European Journal of Operational Research, 1980
Abstract This paper presents a continuous time maintenance problem where deterioration is Markovian and the state of the system is not directly observable except by means of an inspection. The costs incurred are inspection costs, state occupancy costs and replacement costs. We examine the problem of minimizing the expected average cost per unit time.
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Imperfect repair models with preventive maintenance

Journal of Applied Probability, 2003
Brown and Proschan (1983) introduced the imperfect repair model, in which an item, upon failure, is replaced with a new one with probability α, and is minimally repaired with probability 1 − α. In this paper we equip the imperfect repair model with preventive maintenance, and we obtain stochastic maintenance comparisons for the numbers of failures ...
Li, Haijun, Shaked, Moshe
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Imperfect Preventive Maintenance Models

2000
This chapter surveys the earlier results of imperfect preventive maintenance (pm) models which could be applied to actual systems; (i) the unit after pm has the same hazard rate as before pm, (ii) the age of the unit becomes x units of time younger at pm, and (iii) the age reduces to at when it was t before pm.
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Selective Maintenance for Systems under Imperfect Maintenance Policy

2014
Due to the advent of complex engineering systems in the last few decades, reliability and maintenance issues are gaining more attention than ever. Maintenance is important to keep a system running and ensure that it performs its functions satisfactorily. Often, there are limited resources to complete the maintenance of a system.
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