Research on accelerated storage degradation testing for aerospace electromagnetic relay

It is difficult to obtain the failure data of high-reliability and long-lifetime aerospace electromagnetic relay, even if based on the traditional accelerated storage life testing method. Aiming at this issue Based on the reliability test technique, the scheme of accelerated degradation testing for aerospace relay was designed. The test system of aerospace electromagnetic relay storage parameters under temperature-accelerated stress was designed and developed. Taking a certain aerospace electromagnetic relay as the research object, the accelerated storage degradation testing was carried out. The most past research on storage reliability of relay only focuses on the measurement of relay contact resistance. And, the relay time parameters (closing time, opening time, overtravel time, rebound duration time.) which reflect main performance function was not monitored. So, in this paper the relay time parameters and relay contact resistance were detected simultaneously. The test system of relay storage parameters could be implemented the function that the contact resistances and time parameters of 40 aerospace relays under several temperatures were monitored automatically at the same time. And, the test system transmitted the test data to the host computer for processing. According to the analysis on experiment results of contact resistance, relay time parameters, the degradation phenomena and degradation mechanism of aerospace electromagnetic relay in long-term storage are investigated. These studies provide the basis and reference for latter aerospace electromagnetic relay storage life prediction and using the method of prognostics and health management.