Ground gravity unloading support method for large spatial reflector

Abstract

A ground gravity unloading support method for a large spatial reflector belongs to the technical field of space optics. In order to solve the problem that the gravity environmental variation of the large spatial reflector results in the decline of the surface shape precision of the reflector, a finite element analysis software is adopted to carry out finite element modeling on a spatial reflector assembly and analyze the variation of the reflector surface shape precision caused by gravity when the spatial reflector assembly is horizontally placed; the number and distribution of active support points at the back of the spatial reflector are primarily determined according to the size of the spatial reflector, the variation analysis result of the reflector surface shape precision and the layout condition of a support structure; after support force is applied on the active support points of the spatial reflector, the variation condition of the reflector surface shape precision caused by gravity when the spatial reflector assembly is horizontally placed is analyzed, the reflector surface shape precision result of the spatial reflector assembly is enabled to meet optical design requirements through analyzing and adjusting the size of the support force applied on the active support points and the number and distribution of the active support points, and the gravity unloading of the reflector is realized.

Description

technical field [0001] The invention relates to a ground gravity unloading and supporting method for a large space reflector, which belongs to the field of space optics technology. Background technique [0002] Space optical remote sensors operate in the microgravity environment of space, while the processing, testing and assembly of the space mirror components are all carried out in the gravity environment on the ground. Different gravitational environments change the stress of the space mirror assembly, which in turn causes the space mirror to deform, resulting in a decrease in the surface shape accuracy of the mirror and a decrease in the imaging quality of the space optical remote sensor. Therefore, in the design of the space mirror assembly, it is necessary to reduce the influence of gravity on the surface shape accuracy of the space mirror as much as possible to ensure the imaging quality of the space optical remote sensor. [0003] At present, the space mirror assemb...

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Problems solved by technology

[0005] The present invention aims to solve the problem that when a large-scale space reflector enters from the gravitational environment during ground processing and assembly into the microgravity environment during space work, the changes in the two gravity environments will cause the surface shape accuracy of the reflector to decrease, so that the space optical remote sensor can be imaged. To solve the problem of quality degradation, a ground gravity unloading support method for large space mirrors that can actively support the space mirror components during the entire process of space optical remote sensor development is proposed

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