Abstract
The approaches to the system reliability evaluation with respect to the cases, where the components are independent or the components have interactive relationships within the system, were proposed in this paper. Starting from the higher requirements on system operational safety and economy, the reliability focused optimal models of multiobjective maintenance strategies were built. For safety-critical systems, the pessimistic maintenance strategies are usually taken, and, in these cases, the system reliability evaluation has also to be tackled pessimistically. For safety-uncritical systems, the optimistic maintenance strategies were usually taken, and, in these circumstances, the system reliability evaluation had also to be tackled optimistically, respectively. Besides, the reasonable maintenance strategies and their corresponding reliability evaluation can be obtained through the convex combination of the above two cases. With a high-speed train system as the example background, the proposed method is verified by combining the actual failure data with the maintenance data. Results demonstrate that the proposed study can provide a new system reliability calculation method and solution to select and optimize the multiobjective operational strategies with the considerations of system safety and economical requirements. The theoretical basis is also provided for scientifically estimating the reliability of a high-speed train system and formulating reasonable maintenance strategies.
Highlights
With the rapid development of Chinese high-speed trains, traditional maintenance strategies may not fit the train organization pattern of “high density, high frequency, high security” due to its disadvantages of short overhaul period, high maintenance costs, and long parking time
Compared with the traditional system reliability estimate value without taking the operational strategy into consideration, this estimate value considers the corresponding relationship between the system reliability and maintenance, and it can meet the need for balance between the higher safety and economy of enterprises and can offer a theory for scientifically estimating the system reliability of high-speed trains and making rational maintenance strategy
This paper presents a new method to estimate the system reliability based on convex combination considering operation and maintenance strategy
Summary
With the rapid development of Chinese high-speed trains, traditional maintenance strategies may not fit the train organization pattern of “high density, high frequency, high security” due to its disadvantages of short overhaul period, high maintenance costs, and long parking time. Eti et al [2] summarized the research process that the center of maintenance strategy changed from the reactive repair-focused pattern to the reliability-centered pattern. Zhou et al [4] integrated the sequential imperfect maintenance policy into condition-based predictive maintenance, and a reliability-centered predictive maintenance policy was proposed for a continuously monitored system subject to degradation due to the imperfect maintenance. He et al [5] found out that operational reliability evaluation theory reflected real-time reliability level of power system, and the component failure rate varied with operating conditions
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