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    題名: Optimal step-stress accelerated degradation test plan for gamma degradation processes
    作者: Tseng, Sheng-tsaing;Balakrishnan, N.;Tsai, Chih-chun
    貢獻者: 淡江大學數學學系
    日期: 2009-12
    上傳時間: 2011-09-29 20:40:25 (UTC+8)
    出版者: IEEE Reliability Society
    摘要: Step-stress accelerated degradation testing (SSADT) is a useful tool for assessing the lifetime distribution of highly reliable products (under a typical-use condition) when the available test items are very few. Recently, an optimal SSADT plan was proposed based on the assumption that the underlying degradation path follows a Wiener process. However, the degradation model of many materials (especially in the case of fatigue data) may be more appropriately modeled by a gamma process which exhibits a monotone increasing pattern. Hence, in practice, designing an efficient SSADT plan for a gamma degradation process is of great interest. In this paper, we first introduce the SSADT model when the degradation path follows a gamma process. Next, under the constraint that the total experimental cost does not exceed a pre-specified budget, the optimal settings such as sample size, measurement frequency, and termination time are obtained by minimizing the approximate variance of the estimated MTTF of the lifetime distribution of the product. Finally, an example is presented to illustrate the proposed method.
    關聯: IEEE Transactions on Reliability 58(4), pp.611-618
    DOI: 10.1109/TR.2009.2033734
    顯示於類別:[數學學系暨研究所] 期刊論文

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