Research on Failure Modeling and Process Optimization of Transmission Conductive Slip Ring for Aerospace

The space signal transmission system is the lifeline of the space system and the conductive slip ring is an important component of the signal transmission system in the space system. It is one of the few single point failure links of the whole satellite. Because of the influence of current and friction in the working environment, the slip ring is in the complex environment of multi-field coupling, which makes its physical modelling particularly difficult. At the same time, its high price and the complexity of the test process further increase the difficulty of the study of the slip ring. In order to improve the stability and reliability of the space signal transmission system, the failure physical model of the conductive slip ring is established, which is an important part of the space signal transmission system. The process of the slip ring is optimized based on the model, so as to enhance the stability and reliability of the whole space system. According to the running principle and failure characteristics, the amount of debris produced by the friction pairs of the slip ring is taken as its degradation characteristic. The contact zone and temperature changes during the wear process are calculated by Hertz contact theory and heat transfer method respectively and the influence of thermal electric multi-field coupling on the wear of the friction pair is quantified. The multi-physical field coupling wear model is used to predict the wear life of friction pairs so as to improve the reliability and stability of slip rings. The correctness of the model is verified by comparing with the real wear test data. The model is applied to the actual process design of slip ring friction pairs. The proposed multi-field coupling model can effectively reveal the micro-operation mechanism of the slip ring friction pair and implement life prediction and then reliably optimize the slip ring process and improve the life and operational reliability. It meets the needs of the new generation of long-life satellite space fault-free long-term reliable operation.