机载电子产品外场可靠性评估适用模型

Applicable Model for Field Reliability Evaluation of Airborne Electronic Production

对于机载电子产品，传统的外场可靠性评估模型，是把空中工作时间和地面工作时间简单相累积，并没有考虑任务剖面，而实际实验中，由于不同的任务剖面会造成设备故障率不同，在做可靠性评估时，要考虑环境对设备故障的影响。文章结合外场试飞试验可靠性评估，总结前人经验，给出了在外场可靠性评估中引入环境因子的算法，试验表明，引入环境因子是扩大样本量的一种有效且可行的方法；同时对于零故障小样本的可靠性评估，给出了综合Bayes评估方法，并结合外场可靠性评估数据，进行模型验证；验证表明，在进行机载电子设备外场可靠性评估时，引入环境因子，并利用综合Bayes评估方法，不仅扩大了评估样本，而且提高了评估置信度。

Conventional reliability evaluation model simply adds air working-time to ground working-time for air electronic production, without considering task profile, but in real test, the effect of environment on equipment failure is considered when doing reliability evaluation since different task profiles lead to different equipment failure rate. On the basis of reliability evaluation of flight test, the arithmetic that environment factor is intro- duced into field reliability evaluation test is proposed based on the experience of predecessor. The test indicates that introduction environment factor is an efficient way to enlarge sample size. At the same time, this paper pro- poses integration Bayes to evaluate reliability of zero failure little sample, and model validation is made through outfield reliability evaluation data. The validation results show that introduction environment factor and utiliza- tion integration Bayes not only enlarge evaluation sample but also raise evaluation confidence when doing relia- bility evaluation for air electronic production.