An underactuated control system of a flexible spacecraft based on a switching control method and its attitude control method

Abstract

The invention discloses a flexible spacecraft underactuated system based on the switching control method and an attitude control method of the flexible spacecraft underactuated system based on the switching control method and belongs to the technical field of spacecraft attitude control. According to the flexible spacecraft underactuated system based on the switching control method and the attitude control method of the flexible spacecraft underactuated system based on the switching control method, a dynamical model of a flexible spacecraft with an execution mechanism completely ineffective is established, coupling, caused by elastic vibration of a flexible accessory, with a rigid body is taken as an uncertainty of the system, a dynamical model of a conversion system is a standard nonlinear model, all states are divided into three sliding model surfaces according to the layering sliding model idea, an equivalent control component is designed for the first layer of sliding model surface according to the Filippov equivalent theorem, a switching control law is designed by means of the second layer of sliding model surface and the third layer of sliding model surface, and a final control law is formed by combining equivalent control input and the switching control law. By the adoption of the flexible spacecraft underactuated system based on the switching control method and the attitude control method of the flexible spacecraft underactuated system based on the switching control method, the defect that in the prior art, a flexible spacecraft can not operate normally under the condition that an actuator becomes ineffective completely during operating of the flexible spacecraft is overcome, and operating reliability of a flexible spacecraft attitude control system is improved.

Description

technical field [0001] The invention discloses an underactuated control system of a flexible spacecraft based on a switching control method and an attitude control method thereof, belonging to the technical field of attitude control of spacecraft. Background technique [0002] The problem of spacecraft attitude control, because of its important engineering and academic value, has aroused people's great interest, and various spacecraft attitude control methods and technologies have been proposed. With the rapid development of space technology, a new generation of spacecraft, including modern satellites, orbital space stations, and space probes, are constantly entering space, making the control of flexible spacecraft an important topic in the field of space high-tech research. [0003] According to the tasks undertaken, the rigid body of this type of spacecraft often has various flexible space structures (FlexibleSpace Structure), such as large parabolic antennas, solar panels...

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad have studied the attitude control of flexible spacecraft and the attitude control of underactuated rigid spacecraft, and have achieved certain results, but there are few studies on the attitude control of flexible underactuated spacecraft

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