A fast on-orbit closed-loop identification method, system and medium for spacecraft disturbance torque

Abstract

The invention discloses a rapid spacecraft disturbance torque on-orbit closed-loop identification method, system and medium, and provides a rapid orbital transfer disturbance torque closed-loop identification method to solve the attitude control problem of a spacecraft with flexural vibration and liquid sloshing in orbital transfer during ignition of a main engine. The method includes the steps: (1) integrating angular speed measured by a gyroscope to obtain an attitude angle and calculating needed control quantity by a controller; (2) inputting data to a disturbance estimation equation according to attitude angle input and the calculated control quantity to obtain a preliminary estimation value of disturbance torque; (3) further inputting the preliminary estimation value of the disturbance torque to a filter, and filtering low-frequency flexural and liquid sloshing information to obtain final disturbance estimation values. By the method, when flexural vibration and liquid sloshing arepresent, the disturbance torque can be rapidly and accurately identified. Disturbance identification results can be directly fed forward to an integral term, so that attitude overshoot caused by start of the main engine can be decreased.

Description

technical field [0001] The invention discloses a fast on-orbit closed-loop identification method, system and medium for spacecraft disturbance torque, belonging to the field of control engineering. Background technique [0002] Modern large spacecraft are generally equipped with larger solar panels and more liquid fuel, and are generally affected by flexural vibration and liquid slosh during actual operation. When the spacecraft is changing orbit, the main engine will generally generate disturbance torque to the attitude system. In order to suppress the influence of the flexible vibration of the sailboard and the liquid sloshing of the storage tank on the attitude during the track change, the controller in the form of PID+structure filter is generally used for attitude control in engineering. On the one hand, in order to suppress the attitude overshoot caused by the disturbance torque, the traditional solution is to increase the control bandwidth. On the other hand, the co...

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Problems solved by technology

On the other hand, in order to suppress flexibility and liquid slosh, the controller bandwidth must be sufficiently low

Therefore, suppression of interference and suppression of flexural vibration and liquid sloshing have become a pair of prominent contradictions

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