Research on Accelerated Degradation Test and Reliability Evaluation Method of Electromechanical Products

According to the characteristics of long life and high reliability of aviation electromechanical products, the reliability of electromechanical products was evaluated by designing step down stress accelerated degradation test (SDSADT) and modeling analysis of performance degradation data. An accelerated degradation test scheme combining pre-test and formal test was proposed. Based on the degradation data of product performance, a nonlinear Wiener process degradation model with measurement error was established. The random drift parameters and random initial values caused by individual differences were considered. A multi-stage parameter estimation method was proposed and the product failure time distribution was derived. The simulation results were compared with the traditional Wiener model. Finally, the test verification and life evaluation of a certain type of resolver were carried out, and the reliability curve of this type of resolver under normal temperature storage environment was obtained. The results show that the proposed accelerated degradation test scheme can significantly shorten the test time, improve the test efficiency and data validity, the performance degradation model used is more accurate than the traditional Wiener model, and the reliability evaluation results are reliable.