Attitude control and fuel sloshing suppression method for liquid-filled spacecraft system

Abstract

The invention discloses an attitude control and fuel sloshing suppression method for a liquid-filled spacecraft system. The method includes the steps that a model of the liquid-filled spacecraft system is built according to the Lagrange-Euler equation, and a reduced-order model of the system is obtained and divided into two subsystems to be respectively designed; the feedback control design is conducted on the first subsystem, and the state of the system serves as external input of the second subsystem; the second subsystem represented in a form of an under-actuated system is made into a standard form, the characteristics of the system are analyzed, and then a controller is designed through a sliding mode control method suitable for the under-actuated system. When liquid in a storage tank of a spacecraft is sloshed, attitude control over the spacecraft and liquid sloshing suppression can be achieved at the same time, eventually the whole spacecraft system can be kept stable to finish preset actuation actions, and therefore flight safety of the spacecraft is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to an attitude control of a liquid-filled spacecraft system and a method for suppressing fuel sloshing based on the sloshing effect of liquid fuel in a storage tank. Background technique [0002] With the rapid development of the aerospace industry and the increasing number of space missions, higher performance requirements are put forward for rockets, satellites and other spacecraft, which requires the spacecraft to carry more liquid fuel. The movement of a large amount of liquid will have a key impact on the attitude control and stability of the spacecraft, which is mainly manifested in two aspects: on the one hand, as the mass of liquid sloshing increases, its sloshing frequency gradually decreases, and the natural sloshing frequency is often at zero Between a few to a few hertz, this lower and lower shaking frequency is likely to cross-couple with the struc...

AI Technical Summary

Problems solved by technology

Sliding mode control has a strong control effect on nonlinear objects, and has the advantages of rapid response, insensitivity to modeling errors, parameter uncertainties and disturbances, and simple physical implementation. However, the current sliding mode control for liquid-filled spacecraft systems The scheme has certain limitations, requiring that the two sub-sliding mode surfaces s 1 and s 2 Before converging to 0, their product s 1 the s 2 The sign is constant, which is difficult to guarantee in practice

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