Vibration suppression method for large flexible spacecraft based on Stewart platform

Abstract

The invention discloses a large flexible spacecraft vibration suppression method based on a floating base Stewart platform, belongs to the field of spacecraft dynamics and control research, and particularly relates to a method for carrying out dynamic modeling and flexible vibration suppression on a large flexible spacecraft by adopting the floating base Stewart platform. Compared with a traditional Stewart platform with a fixed base, the Stewart platform dynamics model with the floating base is adopted, and the attitude motion of the whole spacecraft can be described more accurately; and theflexible vibration coupling relationship can be more conveniently applied to the spacecraft. The influence of the mass and inertia of the additional active driver is considered in strut dynamic modeling; the nonlinear rigidity-flexible coupling theory is adopted, and a coupling dynamics state space model of the space large-scale flexible spacecraft based on the Stewart platform and containing thethermal load is established.

Description

technical field [0001] The invention belongs to the field of spacecraft dynamics and control research, in particular to a method for suppressing the flexural vibration of a large flexible spacecraft by using a floating-base Stewart platform, researching the construction of the overall system dynamics model of the spacecraft and the integration of active and passive systems Flex vibration suppression. Background technique [0002] The flexible spacecraft described in the present invention refers to a system that can be simplified as a mathematical model composed of a central rigid body (body) and a flexible body. The Stewart platform with six degrees of freedom is installed between the central rigid body and the flexible body, in which the upper platform is fixedly connected to the flexible body, and the lower platform is fixedly connected to the spacecraft body, as shown in figure 1 shown. The flexible body is a thin beam / plate structure with cantilever extension, which ha...

AI Technical Summary

Problems solved by technology

At present, there are few research results on the Stewart platform in the field of flexible spacecraft vibration suppression. The existing research is based on the Stewart platform with a fixed base, and the established rigid-flexible coupling dynamic model of the upper platform and the flexible structure is relatively It is simple and cannot effectively reflect the influence of complex external loads and rigid body motion on the vibration of flexible bodies. At present, there is little research on flexible vibration suppression based on floating Stewart platforms.

In addition, the central rigid body of a large-scale flexible structure spacecraft accounts for a relatively small proportion of the entire star, and its rigid-flexible-thermal coupling effect is more prominent, and the thermal load will also have a significant impact on the attitude motion and the dynamic characteristics of the vibration suppression system. However, the current flexible vibration suppression technology based on the Stewart platform cannot solve this problem well

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