Research On Fault Risk Analyzing Method Of Satellite Based On Spreading Effect

There are propagation characteristics and effects of satellite on-orbit faults.For example,a component failure not only causes the component function to be lost,but also affects other parts or functions of the system,thus affecting the overall function of the system.Whether it is part or sub-system failure,or parts or sub-system state abnormal changes,if disposed of properly,it may cause satellite performance degradation,loss of function or life or even failure.In this paper,the problem of satellite fault propagation and effect modeling and fault risk analysis are studied with XX satellite power supply system.The main research contents include the following aspects:(1)Presents a framework(PNFFIP)of functional fault identification and propagation analysis,including state model,function model,component behavior model,function failure logic and behavior simulation,and automatic modeling algorithm based on Petri net to solve the problem of fault propagation and effect analysis And fault risk analysis.(2)Analyze the working principle of XX satellite power supply system and establish the system model of satellite power supply system.According to the mathematical model and the relationship between parts of XX satellite power system,the Simulink simulation model of power supply system is established.By behavior simulation for satellite power system,establish the foundation for system risk analysis.(3)Analyze the fault propagation and effect of the power system based on the behavior simulation,construct the Petri net model,and use the online backtracking recognition algorithm to analyze the critical state of the satellite power system,and obtain the critical state of the system.Through the quantitative analysis,the impact of system failure risk can obtain,it can provide support for the power supply system of risk control decisions.(4)XX satellite power system failure risk modeling and analysis examples.At the end of the paper,the content of the research is summarized,and the content of further research is prospected.