Decentralized coordination robust control method for large flexible spacecraft based on consistency theory

Abstract

The invention discloses a decentralized coordination robust control method for a large flexible spacecraft based on a consistency theory. The decentralized coordination robust control method comprisesthe steps of: dividing a large flexible spacecraft system into a slow subsystem (attitude dynamics system) and a fast subsystem (structural vibration system); performing periodic control on the spacecraft system, regarding slow variation attitude parameters as constants in each period, converting a flexible structural vibration subsystem dynamics model into a decentralized parameterization model,and designing an optimal observer suitable for the consistency theory; analyzing a communication topological structure, designing a consistency control strategy, researching a flexible structural profile keeping consistency control theory based on a graph theory, and realizing asymptotic stability of a large-scale flexible structure profile keeping system; and equalizing vibration mode parameterin each attitude pointing control period, designing an attitude control robust optimal controller, and finally realizing high-precision pointing control of the large flexible spacecraft. The decentralized coordination robust control method enhances the robustness and fault tolerance of the system.

Description

Technical field [0001] The invention relates to the technical field of high-precision attitude control and active vibration suppression of a large flexible spacecraft, in particular to a decentralized coordination robust control method for a large flexible spacecraft based on a consistency theory. Background technique [0002] Earth observation missions in recent years, especially for ships, aircraft and other moving target observation missions, have put forward higher requirements for the observation width and resolution of space-based radar satellites. There is an urgent need to develop ultra-large scale and high surface accuracy. Space-based radar. Because this kind of spacecraft requires high attitude stability and pointing accuracy, and there are many measurement and control actuators arranged on the structure, it is a typical distributed parameter system, and coordinated control is required to ensure the overall performance of the system. The traditional centralized Modula...

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Problems solved by technology

Furthermore, there are unavoidable perturbation forces, disturbance moments, and environmental temperature factors in the outside world, and the spacecraft dynamics model itself has uncertain effects such as modeling errors and order reduction errors. Difficulty, which poses a challenge to the design of the control system

[0003] Decentralized control has the advantages of simple design and high robustness, and has become the development direction of large-scale flexible structure vibration suppression control. However, for the current decentralized control of large-scale flexible structures, most scholars assume that large-scale flexible structures are cantilever beams. , without considering the consistent coordination control problem of the large-scale flexible structure and the central rigid body, and in order to increase the fault tolerance and robustness of the system, it is also necessary to consider the consistent coordination control problem of the flexible structure decentralized system; Uncertainties such as error, it is necessary to comprehensively consider the above factors, and it is necessary to study the decentralized coordination robust control method of large flexible spacecraft under interference conditions

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