Intermittent Fault Tolerance Analysis Method for Spacecraft Attitude Control System

Abstract

The invention discloses an intermittent fault fault-tolerance analyzing method of a spacecraft attitude control system. The method comprises the following steps of: firstly establishing a spacecraft attitude control mathematical model; secondly establishing an intermittent controller fault mathematical model; designing a controller by using a Lyapunov method and depicting the behaviors of the attitude control system under a normal condition and a fault condition respectively; describing the whole operation process of the spacecraft attitude control system with the intermittent fault by using a random switchover system model; and furthermore converting a fault-tolerance analysis problem of the attitude control system into a stability analysis problem of a switchover system with the unstable model attitude. A fault-tolerance reference is provided so as to judge whether the system is stable at present in real time; once the reference is met, no any fault-tolerance control measure needs to be taken; and the system can be still kept stable under the balance action at the normal state and the fault state; and by utilizing the method, the high control energy consumption, the high calculation complexity and the risk generated while the fault-tolerance control is adopted or during the implementation process of the fault-tolerance control can be avoided.

Description

technical field [0001] The invention belongs to the field of spacecraft attitude fault-tolerant control, in particular to a fault-tolerant analysis method for intermittent faults of spacecraft controllers. Background technique [0002] The problem of spacecraft attitude control has aroused great interest because of its important engineering and academic value. The spacecraft attitude control system has extremely high requirements for safety, and the controllers, actuators, sensors, and internal systems of the attitude control system may fail. These failures will seriously affect the performance of the system, and even cause the system to crash. Therefore, the attitude control system needs to have a certain fault tolerance to ensure the stability and reliability of its operation. There have been many achievements on the methods and technologies of spacecraft fault-tolerant control, such as literature (IEEE Transactions on Control Systems Technology, 2008, 16 (4), 799-808), (...

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Problems solved by technology

[0005] 1) The frequency of intermittent faults is relatively high. If you adjust the controller every time these faults occur, it will consume a lot of control energy consumption;

[0006] 2) If the controller is adjusted too frequently, serious overshoot will occur, which will degrade the performance of the system or even become unstable;

[0007] 3) When the controller itself fails, it is difficult to adjust the controller to achieve the fault tolerance goal

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