What is it about?
System availability is defined as the ability to satisfy consumer demand. Based on the three-phase approach, a simulation procedure is used to evaluate the expected multi-state system availability and life cycle costs. Also, a multi-seed Tabu search heuristic algorithm with a proper neighborhood generation mechanism is proposed to solve the formulated problem. An application to the optimal design of a wind farm is provided to illustrate the proposed approach.
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Why is it important?
Different from existing approaches that consider binary or multi-state elements, our approach considers modular redundancy in which each module/subsystem is composed of several multi-state components in series. The status of each component is considered to degrade with use. Therefore, a new condition-based opportunistic maintenance approach using three different thresholds for a component health state is developed. The objective is to determine 1) the minimal-cost of k-out-of-n system structure, 2) optimal imperfect opportunistic maintenance strategy, 3) optimal maintenance capacity, and 4) optimal inspection interval subject to an availability constraint
Perspectives
In this paper, a new joint redundancy and maintenance optimization model for a weighted k-out-of-n system is introduced. The proposed model attempts to minimize the expected system life cycle cost under an availability constraint determining system structure, maintenance policy, system inspection intervals, and maintenance capacity. An opportunistic maintenance approach is developed for k-out-of-n systems considering the following: 1) multi-state subsystems, which consist of several multi-state components, 2) periodic inspection of the components health states, 3) imperfect preventive repair actions, 4) several types of operational and maintenance costs, 5) maintenance activation delays, 6) limited number of maintenance teams, and 7) economic dependence among subsystems and their components
Dr. Karim Atashgar
Iran University of Science and Technology
Read the Original
This page is a summary of: A Joint Reliability and Imperfect Opportunistic Maintenance Optimization for a Multi-State Weighted k-out-of-n System Considering Economic Dependence and Periodic Inspection, Quality and Reliability Engineering International, February 2017, Wiley,
DOI: 10.1002/qre.2136.
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