想請教各位: 元件的MTTF跟許多元件組合成一個系統以後的MTTF會有什麼樣的關聯?
有什麼公式可以計算嗎? 或是有什麼參考的書目與網站, 感謝您!!
2007-08-31 10:15:20 · 3 個解答 · 發問者 Zoe柔依 1 in 科學 ➔ 其他：科學
先澄清樓上大大所提出的兩個名詞﹐MTBF與MTTF
MTBF (Mean Time between Failure) 指系統在兩個失敗間的平均時間﹐適用在可以修復的系統。
MTTF(Mean Time To Failure): 系統平均失敗時間﹐通常應用在不修復的系統 （可能因技術困難或費用過高而不修復)
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至於元件與系統的MTTF間之關係則頗為複雜﹐最簡單的狀況是元件成串連方式﹐則可以用元件的失效率( λ 其中 MTTF = 1/λ)來計算
系統 = A-B-C-D （系統由A,B,C,D串成﹐ABCD之失效都會造成系統之失效)
則系統 λS = λA x λB x λC x λD
而系統 MTTF = 1/λS
要注意的是有時元件會成並聯排列﹐則系統 MTTF 之計算就會複雜些﹐有點類似電阻的並串連的阻值計算。
2007-09-05 04:36:25 · answer #1 · answered by dav00hsu 4 · 0⤊ 0⤋
The MTBF is the sum of the MTTF (Mean Time to Failure) and MTTR (Mean Time to Repair).
2007-09-02 23:35:33 補充：
Mean time between failures (MTBF) is the mean (average) time between failures of a system. Calculations of MTBF assume that a system is "renewed", i.e. fixed, after each failure, and then returned to service immediately after failure. The average time between failing and being returned to service is termed mean down time (MDT) or Mean Time to Repair (MTTR).
The MTBF is the sum of the MTTF (Mean Time to Failure) and MTTR (Mean Time to Repair).
參考網頁
http://en.wikipedia.org/wiki/Mean_time_between_failures
有公式可以計算
2007-09-02 19:35:33 · answer #2 · answered by travelpa 7 · 0⤊ 0⤋
你有沒有搞錯﹖應該是MTBF吧﹖不然MTTF是什麼﹖
2007-09-01 18:17:16 · answer #3 · answered by november_kimo 7 · 0⤊ 0⤋