Abstract: Aiming at the characteristics of long life and high reliability of aviation electromechanical products, the accelerated storage test was designed, and the performance degradation data was modeled and analyzed to predict the service life of electromechanical products. A new accelerated storage test scheme combining pretest and formal test was proposed. According to the product performance degradation data, the nonlinear degradation model of performance parameters was established. The pseudo life distribution was determined by likelihood ratio test, and the life under test temperature was calculated. The storage life at room temperature was obtained by Arrhenius model. Finally, the effectiveness of the test scheme was verified by the failure mechanism consistency test. The test verification and life evaluation of a certain type of highspeed motor were carried out by using the above method. The results show that the proposed accelerated storage test scheme can significantly shorten the test time, improve the test efficiency and data validity, and the data analysis method can accurately fit the performance degradation trajectory and pseudo life distribution model of products, and the life evaluation results are reliable.

Key words:  electromechanical products; accelerated storage test; storage life; reliability; likelihood ratio test