描述
1)早期故障較高(O~t0期間)。主要是由于系統(tǒng)內(nèi)在設(shè)計(jì)錯(cuò)誤、元器件質(zhì)量、安裝和工藝缺陷等不合理原因引起,但隨時(shí)間的增加故障率迅速降低。這一時(shí)期的主要任務(wù)是盡早找出不可靠的因素使系統(tǒng)盡快穩(wěn)定下來(lái)。
(2)偶然期故障期(t0~t1期間)比較穩(wěn)定,也可稱(chēng)為隨機(jī)故障期。此時(shí)期故障是隨機(jī)發(fā)生的,系統(tǒng)的故障率最低而且穩(wěn)定,可視為常數(shù)。這一時(shí)期是系統(tǒng)的狀態(tài)期,在運(yùn)行中應(yīng)以加強(qiáng)維護(hù)延長(zhǎng)這段時(shí)期的時(shí)間,應(yīng)做好定期檢修和維護(hù)工作。
(3)損耗期(t1之后)故障率上升,這是因?yàn)槌r(shí)間以來(lái)構(gòu)成系統(tǒng)的某些零件已經(jīng)老化耗損,壽命衰竭機(jī)械和電氣磨損以及絕緣的老化所引起。在這段時(shí)期中大部分元件要開(kāi)始失效。如能事先知道損耗開(kāi)始的時(shí)間,事先更換元器件,延長(zhǎng)系統(tǒng)的有效壽命。推遲耗損故障期的到來(lái)。
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