CAJ | 학술논문

目的：在产品寿命服从参数未知指数分布的情况下，分析定时转换步加试验得到的数据，估算相关的加速因子。方法列出各应力下的寿命分布密度函数形式，通过加速因子建立各分布密度函数之间的联系，以条件概率的方式处理步加试验每一阶段开始时的累积损伤问题，以极大似然估计的方法进行参数估计。结果得出了一种新的估算加速因子的方法，计算获得了产品在所分析应力下加速因子与应力水平之间的关系。结论利用该方法能很好地处理某应力下无失效发生的情况。
목적：재산품수명복종삼수미지지수분포적정황하，분석정시전환보가시험득도적수거，고산상관적가속인자。방법렬출각응력하적수명분포밀도함수형식，통과가속인자건립각분포밀도함수지간적련계，이조건개솔적방식처리보가시험매일계단개시시적루적손상문제，이겁대사연고계적방법진행삼수고계。결과득출료일충신적고산가속인자적방법，계산획득료산품재소분석응력하가속인자여응력수평지간적관계。결론이용해방법능흔호지처리모응력하무실효발생적정황。
Objective To estimate the associated acceleration factor by analyzing the Trial data of step-stress accelerated life tests (SSALT) with Type-I censored data, assuming the lifetime of products followed exponential distribution. Meth-ods Lifetime distribution density functions under different stresses were listed. Linkages were established between the distri-bution density functions by acceleration factors (AF). And then conditional probability distribution was used to deal with the problem of cumulative damage at the beginning of each stage by stepwise analysis of the testing. The AFs were esti-mated by maximum likelihood estimation. Results The paper offered a new method to deal with the cumulative damage. The relationship between AFs and stress levels under the tested stress was calculated. Conclusion It is a feasible method to cater the situation that no failure occurs under certain stress.