(1)Early failure is high(during O~t0).It is mainly caused by unreasonable reasons such as internal design errors of the system,component quality,installation and process defects,but the failure rate decreases rapidly with the increase of time.The main task of this period is to find out the unreliable factors as soon as possible to stabilize the system as soon as possible.
(2)Occasional failure period(during t0~t1)is relatively stable,which can also be called random failure period.In this period,the failure occurs randomly,and the failure rate of the system is the lowest and stable,which can be regarded as a constant.This period is the state period of the system.During operation,it should be extended by strengthening maintenance,and regular inspection and maintenance should be done.
(3)The failure rate increases during the wear-out period(after t1),which is caused by the aging and wear-out of some parts constituting the system over a long period of time,the aging of mechanical and electrical wear and the aging of insulation.During this period most components will begin to fail.If you can know in advance the time when the wear starts,replace the components in advance to prolong the effective life of the system.Delay the arrival of the wear-out failure period.
(1)早期故障较高(O~t0期间)。主要是由于系统内在设计错误、元器件质量、安装和工艺缺陷等不合理原因引起,但随时间的增加故障率迅速降低。这一时期的主要任务是尽早找出不可靠的因素使系统尽快稳定下来。
(2)偶然期故障期(t0~t1期间)比较稳定,也可称为随机故障期。此时期故障是随机发生的,系统的故障率最低而且稳定,可视为常数。这一时期是系统的状态期,在运行中应以加强维护延长这段时期的时间,应做好定期检修和维护工作。
(3)损耗期(t1之后)故障率上升,这是因为常时间以来构成系统的某些零件已经老化耗损,寿命衰竭机械和电气磨损以及绝缘的老化所引起。在这段时期中大部分元件要开始失效。如能事先知道损耗开始的时间,事先更换元器件,延长系统的有效寿命。推迟耗损故障期的到来。
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