In reliability engineering, system failures may occur due to intrinsic or extrinsic factors. For example, drinking water systems may fail due to ageing and deterioration (i.e., intrinsic factors) or flooding (i.e., extrinsic factors). An interesting question is: for such systems, how should preventive maintenance be scheduled? This paper investigates this question.ududThe paper develops a maintenance policy for repairable systems subject to extrinsic shocks. It assumes that a system may fail due to either intrinsic factors or extrinsic factors. Reliability indexes and the expected long run cost rate are then derived. A numerical example is given to illustrate the theoretical results.
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机译：在可靠性工程中，系统故障可能由于内在或外在因素而发生。例如，饮用水系统可能会由于老化和恶化（即内在因素）或洪水（即外在因素）而失效。一个有趣的问题是：对于此类系统，应如何安排预防性维护？本文对此问题进行了调查。 ud ud本文针对遭受外部冲击的可修复系统制定了维护策略。假定系统可能由于内在因素或外在因素而失败。然后得出可靠性指标和预期的长期成本率。数值例子说明了理论结果。
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