Angular momentum management method for variable-speed control moment gyroscope

Abstract

The invention relates to an angular momentum management method for a variable-speed control moment gyroscope (VSCMG). A technical scheme is described as follow. An angular momentum management algorithm for the VSCMGs is designed to mainly solve the following problems: mixed mode instruction torque output based on singularity measurement, zero-motion rotor wheel speed balance, zero-motion frame configuration singularity avoidance, frame angular velocity dead-zone nonlinear processing and neglected item compensation, and gives corresponding theoretical analysis. The mixed mode of the VSCMGs gives full scope to the large torque output of the control moment gyroscope and large-angle fast attitude maneuver operation can be achieved by using the steering law. The present invention provides a novel VSCMGs angular momentum management algorithm which is improved significantly in torque output accuracy, angular velocity tracking, and frame singularity avoidance compared with a conventional angular momentum management algorithm, and which has a good engineering value.

Description

technical field [0001] The invention relates to an angular momentum management method of a variable speed control moment gyroscope, relates to the field of attitude control of aerospace satellites, and in particular relates to angular momentum management of a variable speed control moment gyroscope (VSCMG), an angular momentum exchange device used for attitude control on a satellite method, a technology that separates the rotor acceleration and the frame motion to achieve a good torque output accuracy. Background technique [0002] With the rapid development of the aerospace industry and the diversification of space missions, various attitude control devices have emerged as the times require, from pico-satellites of a few kilograms to space stations of hundreds of tons. At present, the actuators used for the active control of satellite attitude maneuvering mainly include thrusters, reaction flywheels, and control moment gyroscopes. Control moment gyros include single frame ...

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Problems solved by technology

[0007] Finally, the variability of the rotor speed of VSCMGs leads to the same angular momentum saturation unloading problem as the flywheel system. How to design an appropriate unloading strategy to ensure that VSCMGs can work stably for a long time is a problem that VSCMGs must consider

[0008] The so-called CMG/RW hybrid mode in the traditional VSCNGs maneuvering law is based on the command torque, through the weight matrix to distribute the torque, and then solve the frame angular velocity and rotor angular acceleration together, and then make the CMG try to avoid hidden singularity through zero motion, and make the rotor The speed tends to the specified speed, but there are two problems in this control law: although the weight matrix of torque distribution can be flexibly changed by the singularity measure of the CMG mode, the re

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