Journal of Applied Reliability (한국신뢰성학회지:신뢰성응용연구)

The Korean Reliability Society (한국신뢰성학회)
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Optimal Design of Accelerated Degradation Tests with Two Stress Variables in the Case that the Degradation Characteristic Follows Weibull Distribution

열화특성치가 와이블분포를 따르는 경우 두 가지 스트레스 변수를 고려한 가속열화시험의 최적 설계

  • Received : 2013.05.08
  • Accepted : 2013.06.08
  • Published : 2013.06.25
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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

References

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