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中文摘要：
为对步进应力加速寿命试验方案的优劣做出合理评价，根据所提出的加速寿命试验方案模拟评价的准则，以中位寿命估计值方差的均值和标准离差分别作为估计精度和稳定性的考核指标，建立步进应力加速寿命试验的数值模拟和模拟评价方法；同时，应用极大似然估计（Maximum likelihood estimate，MLE）理论，建立步进应力加速寿命试验方案模拟评价的数学模型。对Y11X系列电连接器试验方案模拟评价的结果表明，虽然试验投试的样本量越多，试验的统计精度及其稳定性越好，但是，经过优化以后的步进应力加速寿命试验方案，与恒定应力加速寿命试验的优化方案相比较，在相同的样本量下，不仅可以大大缩短试验时间，而且可以达到恒定应力加速寿命试验的统计精度及其稳定性，可以实现高可靠、长寿命的机电产品可靠性的快速评定。
英文摘要：
For reasonable evaluating problems of accelerated life test（ATL）, according to proposed simulation evaluation rule of accelerated life test plans, taking variance mean and standard deviation of product median life as evaluation criteria of test plan＇s precision and stability, the numerical simulation and the simulation evaluation＇s method of step-stress accelerated life test plans are built. Simultaneously, by using maximum likelihood estimation（MLE） theory, the mathematic model used for step-stress accelerated life test plan＇s simulation evaluation is built. The result of the simulation evaluation of YllX electrical connectors＇ step-stress accelerated life test plans shows that although the more samples the better statistical accuracy and stability, compared the optimized results of electrical connectors＇ step-stress ALT with the constant-stresses ALT at the same test samples, the former not only can reduce the test time, but also could keep the precision and stability of statistic as the latter, so ATL can realize fast evaluation of electromechanical products with high reliability and long life.
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