Journal of Korean Society for Quality Management (품질경영학회지)
- Volume 29 Issue 3
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- Pages.49-65
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- 2001
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- 1229-1889(pISSN)
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- 2287-9005(eISSN)
Optimal Design of Accelerated Life Tests under Model Uncertainty
불확정 모형하에서 가속수명시험의 최적 설계
Abstract
This paper presents new compromise ALT plan which is applied to situations that true relationship between stress and parameters is not known exactly. The assumed failure distribution of this study is one of location-scale family, i. e., exponential, Weibull, and lognormal distributions which have been ones of the popular choices of failure distributions. The method of applying the stress is constant, and the censoring mechanism is Type I censoring. Compared with existing compromise plans under true simple linear model in terms of statistical efficiency, the efficiency of new compromise plan is better than the corresponding other compromise ones in most cases. For case when true model is quadratic, this plan can be used without any severe loss in statistical efficiency. The proposed new compromise ALT plan is illustrated with a numerical example and sensitivity analyses are conducted to study effects of pre-estimates of design parameters.
Keywords
- Accelerated Life Tests(ALTs);
- Compromise ALT Plan;
- Simple Linear/quadratic Model;
- Exponential/Weibull/Lognormal Distribution