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Optimal Design of Accelerated Degradation Tests with Two Stress Variables in the Case that the Degradation Characteristic Follows Weibull Distribution  

Lim, Heonsang (Samsung Electronics Co., Ltd.)
Kim, Yong Soo (Kyonggi University)
Publication Information
Journal of Applied Reliability / v.13, no.2, 2013 , pp. 87-98 More about this Journal
Abstract
Accelerated degradation tests (ADTs) measuring failure-related degradation characteristic at the accelerated condition are widely used to assess the reliability of highly reliable products. Often, however, little degradation could be observed even in single-stress ADTs due to the high reliability of test unit, and as a result poor estimate of the reliability may be obtained. ADTs with multiple stress variables can be employed to overcome such difficulties. In this paper, optimal ADT plans with two stress variables are developed assuming that the degradation characteristic follows Weibull distribution by determining the stress levels, the proportion of test units allocated to each stress level such that the asymptotic variance of the maximum likelihood estimator of the q-th quantile of the lifetime distribution at the use condition is minimized.
Keywords
Accelerated Degradation; Maximum Likelihood Estimation; Optimal Test Plan; Two Stress Variables; Weibull Distribution;
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