Modification method of space camera on-orbit micro-vibration simulation model

Abstract

The present invention relates to a modification method of a space camera on-orbit micro-vibration simulation model, belonging to the field of the space camera on-orbit micro-vibration tests, and filling the gap of modification of the space camera on-orbit micro-vibration simulation model. The method comprises the following steps of building a space camera finite element model; acquiring installation interface actual input of the space camera in a whole start state; acquiring internal vibration source actual input of the space camera; performing modal test to modify the space camera finite element model; building a space camera dynamics model; performing individual incentive to modify the space camera dynamics model; performing full incentive to modify the space camera dynamics model; and removing ground test state constraints, and adding a space camera on-orbit state constraint, so as to obtain a space camera on-orbit micro-vibration simulation model. Through adoption of the method, the space camera micro-vibration simulation model comprising the optical imaging characteristic model is modified through simulation tests, so that the simulation model is more accurate, and a foundation is laid for time domain and frequency domain response prediction of the space camera in the micro-vibration environment.

Description

technical field [0001] The invention belongs to the technical field of on-orbit micro-vibration tests of space cameras, and in particular relates to a correction method for an on-orbit micro-vibration simulation model of a space camera. Background technique [0002] In recent years, with the continuous improvement of the resolution of space cameras, the requirements for the accuracy of the equipment have also been continuously improved. During the operation of the space camera, there are various disturbance sources such as the disturbance of the flywheel of the satellite platform, the disturbance caused by the alternation of cold and heat of the large flexible structure, the disturbance of the space camera refrigerator, the disturbance of the fast mirror or the optical moving parts of the focusing mechanism, etc. These disturbance sources Together they constitute the micro-vibration environment that the space camera is subjected to. The micro-vibration environment has the c...

AI Technical Summary

Problems solved by technology

In order to accurately predict the working state of the space camera under the micro-vibration environment, it is necessary to combine the simulation model with the test method. However, as the space camera system becomes larger and more complex, the established space camera simulation model is often inconsistent The physical model of the camera has certain errors, which cannot provide favorable guidance for the micro-vibration analysis of the space camera in orbit in the later stage

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