Modal Identification Method of Satellite Solar Wings Based on Binocular Vision
In solving the problem of modal identification of solar wings of satellites,the traditional contact measurement method affects the dynamical model of the solar wing itself.The method of additional measurement targets adds additional physical components.This increases the complexity of the system.And the traditional method is not conducive to the practical application in orbit.Given this,an optical measurement method without contact and marking points is proposed in this paper.First,the flexible solar wing vibration images are acquired with a satellite-based binocular vision system.The corner points of the solar wing edges are extracted as feature points.The position variation and velocity variation of these feature points in the time domain are measured.Then,the Eigensystem Realization Algorithm(ERA)is used to identify the solar wing modal information.Finally,physical model tests are designed.The test results show that the binocular vision measurement method proposed in this paper has a simple device and high measurement accuracy.This method can complete the modal discrimination of the solar wings with a modal discrimination error of about 3.797%.The proposed binocular camera-based modal discrimination method for solar wing provides a reference for in-orbit measurement of vibration parameters of large flexible structures in space.
machine visionlarge flexible space structurenon-contact measurementmodal parameter identificationfeature extraction
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