A strong anti-disturbance composite control method to overcome the influence of periodic moving parts

Abstract

The invention relates to a strong anti-disturbance composite control method for overcoming the influence of periodic moving parts, belonging to the field of spacecraft attitude control; On this basis, the equivalent feedforward compensation law is designed according to the principle of angular momentum conservation, and the fuzzy logic system is used to adjust the time value of the disturbance torque feedforward compensation, and dynamically adjust the gain of the PID controller according to whether it is in the feedforward compensation period. Compared with the existing method, the method does not need to perform system identification and does not need too much prior knowledge of the model, and achieves a better anti-interference effect with a simple control law; the present invention is used in satellite attitude control with periodic interference. , which can effectively improve the attitude control accuracy and attitude stability of the system. The whole method is systematic, the process is clear, and it is easy to implement.

Description

technical field [0001] The invention belongs to the field of spacecraft attitude control, and relates to a strong anti-disturbance composite control method for overcoming the influence of periodic moving parts. Background technique [0002] Large and long-lived satellites usually carry many different types of payloads, and the satellite dynamic characteristics are complex and control requirements are high. For imaging payloads, the attitude stability of the satellite platform is an important technical indicator. Under the influence of various interference factors such as flexible vibration, liquid sloshing, and component motion, it is difficult to improve the attitude stability of the star. Among the many interference sources on the satellite, the low-frequency motion interference of periodic moving parts is common and has a significant impact. Common periodic moving parts on the star include scanning cameras, scanning antennas, solar windsurfing drive mechanism (SADA) and...

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Problems solved by technology

[0003] For unknown periodic disturbances, the existing control methods are mainly divided into three categories: 1) When the disturbance cannot be measured but the period is known, the repetitive control based on the internal model principle is generally used, which is a kind of feedback control, but there are large When the dynamics are not modeled, the stability of the system is not easy to guarantee; 2) When the disturbance can be directly measured or known in advance (these conditions are usually difficult to meet in engineering), the feedforward-based control method is generally used, including inverse dynamics method and finite impulse response method, etc.; 3) For satellite attitude control with unknown (period unknown or amplitude unknown) deterministic interference, the existing literature mainly adopts system identification method to establish interference model, and the uncertainty of model parameters passes through Improve the robustness of the feedback control law to ensure

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