Study on Evaluation Method of Dielectric Reliability and Working Life in Space Environment

In space environment of high vaccum and radiation,the dielectric of spacecraft will be deep charged and surface charded by cosmical radiation,high-energy electron,high-energy proton and plasma.The discharge between sunside and shadyside of dielectric structure of spacecraft will be excitated by fast exchanging of temperature difference.The high energy discharge pulse more likely make the electronic system of spacecraft disorder,or lead to the function of satellite lose because electronic element or dielectric of the satellite being breakdown.The properties of the dielectric will degradation gradually in space environment,this will affect the reliability and working life of spacecraft hardly.Establish a ground evaluation system on dielectric reliability and working life of the spacecraft,it is very significant for ensuring the reliability and working life of space craft.The main reasons that lead the dielectric of spacecraft to be charged and disˉcharged are analyzed in this paper,the main reasons that affect the workinglife of spacecraft also be discussed.Finaly,the key factors of the ground evaluable sysytem on reliability and working life of spacecraft dielectric are put forword,they are:simulate on main environment of space;testing method and equipment;dielectric construction and properties etc.