离子推进系统仿真与故障诊断研究

Due to the complex composition of the ion thruster system，the probability of failure is greatly increased. It is very important to carry out the fault diagnosis research of ion thruster through the system simulation to ensure the normal operation of the ion thruster system. In this paper，the mathematical model of each subsystem of the ion electric propulsion system is combined with Matlab/Simulink to realize the simulation model of the ion thruster system. Based on the data of the LIP-300 ion thruster，the performance of the simulation model is simulated. The output results of the simulation model are consistent with the existing results in related literature. Using the system simulation model combined with the fault factors，the ion thruster system in the fault state was simulated. The fault data obtained and the Matlab neural network toolbox were used to establish the ion thruster fault diagnosis system. The simulation model was used to generate another set of operating data of the known fault state corresponding to the fault mode，and the diagnostic ability of the fault diagnosis system was tested by using this set of data. Compared with the actual fault mode，the accuracy of the diagnosis result was 93.8%.