Research On Life Quantification Control Method Of Starboard Power Discharge Modules And Its Application

Avionics is an important component of the spacecraft and its effective working life is one of the important design indicators for the life of the spacecraft.During operations,short working life of the electronics posed a huge potential problem to the reliability of the spacecraft as a whole,and even causes the service of the spacecraft ends prematurely.As a result,in order to guarantee the safe operation of the spacecraft,redundancy and back-up electronics have to be installed in the design process of the spacecraft,but this has resulted in complex systems,overweight and high-power consumption,which has had a negative impact on the design of the spacecraft.To accurately control the life of the spacecraft so that the reliability of the spacecraft can be safeguarded,two aspects must be considered.On one hand,there is an urgent need for an accurate method to quantify the life of aerospace electronics to systematically and accurately assess their life under actual operating conditions;on the other hand,there is an urgent need to study aerospace electronics life optimization design methods to optimize the design parameters of each electronic group and component so that the design life of electronics can be controlled within the target range.Aiming at the difficulties above,this paper investigates the life quantification and control method of aerospace electronics based on a typical aerospace electronic productthe discharge module of a spacecraft,and verifies the accuracy of the proposed method based on real accelerated degradation test data,and finally develops a life feature monitoring system for life quantification and control of aerospace electronics based on the proposed method.The main research elements and innovations of this thesis are as follows.（1）The failure of aerospace electronics is qualitatively analyzed,and the main failure modes are determined by the FMMEA method.The stress characteristics of the main components involved in the failure of aerospace electronics are analyzed,and the life quantification model of each component is established based on physics of failure.Combined with the stress parameters of the components obtained by electrical and thermal simulations,the life quantification of power conversion circuits is achieved.（2）A comprehensive importance method combining probabilistic importance and network importance is used to determine the important components in the circuit.Based on the importance of the components,the design parameters of the power controller are optimized from the different design objectives of optimal product reliability and optimal cost,respectively.（3）The actual life of a certain type of power conversion module is evaluated with the data of its accelerated degradation test to verify the rationality and accuracy of the proposed life quantification method.（4）The Pyside2 framework is used to develop a software platform for life quantification and control of aerospace electronics.The platform provides both life feature monitoring and management functions,and has the advantages of a user-friendly interface,smooth operation experience and complete functional guidelines,etc.