摘要(中) |
在可靠度分析中, 加速壽命試驗是指將受測物件置於較正常使用下嚴厲的環境應力中,
以縮短試驗時間的一種方法。本文考慮受測物件是由兩個零件串聯而成, 且零件平均壽
命服從獨立的指數分配, 分別在V-準則、D-準則與A-準則下, 探討兩應力水準恆定
應力加速壽命試驗(two-level constant-stress ALT , CSALT) 與兩應力水準階段應力加速壽命試驗(two-level step-stress ALT , SSALT) 之最佳化問題, 並比較兩最佳化試驗之優劣。在型一設限下, 可由數值結果看出最佳SSALT 在三個準則下皆優於最佳CSALT ; 在無設限下, 我們証明了兩最佳化試驗可得到相同的估計精確度。另外我們以最佳CSALT 作為基準試驗進行SSALT 之等效試驗計畫, 探討在三個準則下之成本效益, 並以實際例子說明, SSALT 只需較少的樣本數或可以縮短試驗的時間。 |
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