Vibration suppression method for large flexible spacecraft on stewart platform

Abstract

The invention discloses a large-scale flexible spacecraft vibration suppression method based on a floating-base Stewart platform, which belongs to the field of spacecraft dynamics and control research, and specifically relates to a floating-base Stewart platform for large-scale flexible spacecraft dynamics modeling method with flex vibration suppression. Compared with the traditional fixed-base Stewart platform, the present invention adopts the dynamic model of the floating-base Stewart platform, which can more accurately describe the attitude motion-flexible vibration coupling relationship of the overall spacecraft, and can be more conveniently applied to space spacecraft. The strut dynamics modeling takes into account the influence of the mass and inertia of the additional active drive itself; using the large-deformation geometric nonlinear rigid-flexible coupling theory, the coupled dynamics of a space-based large-scale flexible spacecraft based on the Stewart platform including thermal loads is established state space model.

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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