The reliability test is one of the important sources to obtain the basic safety data.Considering the actual working environment of airborne equipment,where multiple stress act together to cause product failure and there are com-plex interaction,a reliability test method based on accelerated degradation of multi-stress generalized coupling is proposed in this paper,which can directly obtain the basic safety data for airworthiness compliance verification.Firstly,a nonlinear Wiener accelerated degradation model considering multi-stress generalized coupling is estab-lished,and the form of stress coupling is determined by combining correlation analysis.Secondly,maximum likeli-hood estimation and parameter optimization method based on the multi-stress accelerated degradation model is proposed to solve the problem of multi-parameter estimation.Finally a three-stress accelerated degradation test is carried out with an airborne LED chip as the object to realize the life assessment.The results show that,compared with the traditional multi-stress accelerated model,the proposed method is closer to the actual working condition,and the error is controlled within 1％,and the accuracy of life assessment is high,which can effectively solve the re-al airworthiness problem of missing and inaccurate of basic data.
关键词
适航审定/民机系统安全性评估/基础安全性数据/加速试验技术/多应力耦合
Key words
airworthiness certification/civil aircraft system safety assessment/basic safety data/accelerated test technique/multi-stress coupling
维普
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