A comparison of opimum constant stress and step stress accelerated life tests

일정형 가속수명시험과 계단형 가속수명시험의 비교 : 최적설계를 중심으로

  • 배도선 ((305-701) 대전시 유성구 구성동 373-1, 한국과학기술원 산업공학과) ;
  • 김명수 ((445-743) 경기도 화성군 봉담면 와우리 산2-2, 수원대학교 공과대학 산업공학과) ;
  • 전영록 ((631-701) 마산시 합포구 월영동 449, 경남대학교 산업공학과)
  • Published : 1996.03.01


This paper compares two accelerated life for Weibull distribution. One is the optimum constant stress accelerated life test which minimizes the asymptotic variance of maximum likelihood estimator of a specified quantile at design stress, and the other is corresponding simple step stress test. The models and optimum designs of constant stress and step stress tests are reviewed. Behaviors of asymptotic variances, effects of design parameters to optimum tests, and expected numbers of failures and expected test times of the two tests are investigated. The efficiency of step stress test relative to constant stress test is studied in terms of variance ratio, and robustness to preestimates of design parameters are investigated.

일정형 및 계단형 가속수명시험의 시험설계에 대한 일반적인 모형과 최적설계에 대한 최근의 연구결과를 소개하고, 수명분포가 와이블인 경우에 대하여 두가지 시험방법에 대한 최적설계를 점근분산의 행태, 설계변수의 효과, 최적시험조건에서 시험종결 시점까지의 기대고장개수 및 기대시험종결시간, 점근분산의 상대적효율과 설계변수의 사전추정치에 대한 둔감성의 측면에서 비교, 분석하였다.



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