Research on storage degradation testing and life prediction based on ARMA and wavelet transform model for aerospace electromagnetic relay

Aerospace electromagnetic relay (EMR) is one of the key electromechanical components used for signal transmission, load switching, circuit protection and control and system isolation. At present, concern for the storage reliability of Aerospace EMR is respectively light although it comes to the highly-dependable and long-life electrical components. And the corresponding research still faces a series of problems, such as low level experiment and test detection, unclear law of performance parameters changing, ambiguous about failure mode and failure mechanism, and lack of effective evaluating and predicting means. Therefore, how to evaluate the storage reliability of aerospace EMR has become the important subject that demanding prompt solution at present. This study used aerospace EMR as research object. A new method for testing storage reliability is proposed by performance parameters degradation. The test and analysis system of aerospace electromagnetic relay storage parameters under temperature-accelerated stress was designed and developed. Based on the analysis of parameters changing in storage degradation testing, the modeling storage reliability method of aerospace EMR is extensively investigated. Prediction parameters preprocessing method is proposed which combines time series analysis with one-dimensional wavelet transform method. This reduces the random signal´s influence on the prediction precision in prediction parameters. Parameters of the storage degradation model are estimated through regression theory. And the storage life of aerospace EMR under normal stress is predicted. These studies provide the necessary theoretical method and basis for studying storage reliability of the aerospace EMR. Its key techniques and methods could be also applied to other electromechanical components storage reliability studies.