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Step-stress accelerated life test for secondary power supply of spacecraft

Responsible for supplying energy to electric equipment, secondary power supply of spacecraft is the foundation for the normal operation of electric equipment. Its key status decides the high requirement for performance stability and reliability. Due to the spacecraft product characteristics like small sample, long life and high reliability, it is hard to apply traditional life evaluation methods based on failure data of large sample. Therefore, this paper proposes a step-stress accelerated life test method by aiming at secondary power supply products of spacecraft. Meanwhile, failure activation energy is estimated under the situation of keeping failure mechanism unchanged according to degradation data of key performance parameters and CETRM model. Finally, life evaluation for secondary power supply of spacecraft is realized by utilizing Arrhenius model. This method can solve the long-life verification problem for secondary power supply of spacecraft, and provide references for studies on the life of other small-sample spacecraft products.