A curve describing how the failure rate of equipment changes over its lifecycle, named for its resemblance to the cross-section of a bathtub. It comprises three phases: the early failure period (high and declining failure rate), the random failure period (roughly constant failure rate), and the wear-out period (rising failure rate). It is a fundamental concept in reliability engineering for predicting equipment lifespan and planning maintenance.

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• 2018h30a #58装置のライフサイクルを故障の面から見てみると，時間経過によって初期故障期，偶発故障期及び摩耗故障期に分けられる。最初の初期故障期では，故障率は時間の経過とともに…