Abstract

A repairable system can fail several times since the failed system can be restored to its operating condition through corrective maintenance actions. Different maintenance actions have different effects on time to the next failure and hence the inter-failure times are generally not independent and identically distributed. The model for modeling a given failure process depends on whether the inter-failure times have a trend and whether they are independent and identically distributed. This involves tests for trend and randomness. This chapter presents typical models for modeling failure processes and typical tests for trend and randomness.

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