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Sliding-mode control method with anti-interference fault-tolerance performance

A control method and technology of fault-tolerant performance, applied in attitude control and other directions, can solve the problems of sliding mode control method prone to chattering and failure to take into account

Inactive Publication Date: 2013-05-22
BEIHANG UNIV
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Problems solved by technology

Due to the influence of faults and disturbances in the attitude control system, the sliding mode control method is prone to chattering. Previously, some scholars designed a disturbance observer to offset the influence of disturbances, improve the chattering problem of sliding mode control, and achieve high reliability and precision. Attitude control, but does not account for failures

Method used

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  • Sliding-mode control method with anti-interference fault-tolerance performance

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Embodiment Construction

[0066] Such as figure 1 Shown, the specific implementation steps of the present invention are as follows (taking the three-axis stable satellite attitude control system as an example to illustrate the specific implementation of the method):

[0067] 1. Considering the faults and multi-source interference in the satellite attitude control system, build a system dynamics model

[0068] The Euler angle between the three-axis stable satellite body coordinate system and the orbital coordinate system is very small, and the satellite attitude dynamics and kinematics model can be linearized:

[0069] J 1 φ . . - ω 0 ( J 1 ...

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Abstract

Provided is a sliding-mode control method with anti-interference fault-tolerance performance. A sliding-mode controller with anti-interference fault-tolerance performance is designed and is specific to a system containing faults and interferences. Firstly, faults and multi-source interferences in the system are considered, so that a dynamical model of the system is established. Secondly, a fault diagnosis observer and a disturbance observer are designed to estimate the faults and interferences capable of being modeled. Thirdly, the gain matrix of the disturbance observer and the fault diagnosis observer is solved. Then, the sliding-mode controller is designed to offset faults and interferences respectively by using the estimated value of faults and interferences. Finally, stability of the controller is analyzed and the sliding-mode yield value is determined on the premise that the system input is saturated. According to the sliding-mode control method with anti-interference fault-tolerance performance, the anti-interference and fault-tolerance performance of the system are guaranteed, the buffeting of the sliding-mode control is improved, and the sliding-mode control method can be applied to the attitude control system of the fields of aviation, aerospace and deep space exploration.

Description

technical field [0001] The invention relates to a sliding mode control method with anti-interference and fault-tolerant performance, which can be used for anti-interference and fault-tolerant control of input-limited systems, such as satellites, aircrafts, and other aerospace and deep space exploration fields whose input torque is limited by the maximum rotational speed of a flywheel attitude control subsystem. Background technique [0002] With the complexity of spacecraft missions, the requirements for attitude control accuracy are getting higher and higher, and the high-precision attitude control of spacecraft has become a research hotspot at home and abroad. The space environment in which the spacecraft operates is complex, subject to external and internal multi-source interference and unmodeled dynamics, and the attitude control system has a high probability of failure. Faults of sensors, flywheels, etc. will lead to task interruption or even failure. In order to impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D1/08
Inventor 郭雷雷燕婕乔建忠张培喜陈阳
Owner BEIHANG UNIV
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