Strong anti-interference compound control method for overcoming influence of periodic moving part

Abstract

The invention relates to a strong anti-interference compound control method for overcoming influences of a periodic moving part, and belongs to the field of spacecraft attitude control. The method comprises the following steps: estimating periodic interference by comprehensively utilizing fast Fourier transform (FFT) and an extended state observer (ESO), designing an equivalent feed-forward compensation law according to an angular momentum conservation principle on this basis, adjusting a disturbance torque feed-forward compensation moment value by utilizing a fuzzy logic system, and dynamically adjusting the gain of a PID controller according to whether the disturbance torque is in a feed-forward compensation period or not. Compared with an existing method, the method has the advantages that system identification is not needed, excessive model prior knowledge is not needed, and a good anti-interference effect is achieved through a simple control law; and the method is used for satellite attitude control with periodic interference, and attitude control precision and attitude stability of the system can be effectively improved. The whole method is high in systematicness, clear in process and 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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