Solar cell array modal identification method based on normative variable analysis and improved SSI

Abstract

The invention provides a solar cell array modal identification method based on normative variable analysis and improved SSI. The method comprises the following steps: firstly, constructing a Hankel matrix by utilizing vibration data of a solar cell array, dividing the Hankel matrix into two parts composed of a reference point output and future all measuring point outputs; carrying out projection transformation to obtain an observation matrix of the system, carrying out dimensionality reduction through a normative variable analysis method; obtaining a complex mode of the solar cell array through singular value decomposition; and converting the complex mode into a real mode through matrix transformation; and obtaining the real mode frequency, damping and vibration mode of the solar cell array. According to the method, modal identification of the solar cell array in a satellite space operation state is realized for the free attenuation response vibration signal by utilizing normative variable analysis and an improved SSI method, and stable operation of the solar cell array is guaranteed.

Description

technical field [0001] The present invention relates to the technical field of modal identification, in particular to a modal identification method for solar cell arrays based on normative variable analysis and improved SSI, especially to a modal identification method for satellite solar cell arrays. Background technique [0002] When satellites perform space missions, the requirements for the structure and size of the solar cell array on the star are getting higher and higher, and this kind of large-span flexible structure has the characteristics of large flexibility, low frequency density, weak damping, and low stiffness. It is very easy to be excited by external disturbances to cause structural deformation and vibration, which will lead to attenuation or even failure of payload or attitude accuracy and stability performance. The ground simulation can no longer meet the accuracy requirements, so it is necessary to use the satellite in-orbit operation data to identify the o...

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Problems solved by technology

[0002] When satellites perform space missions, the requirements for the structure and size of the solar cell array on the star are getting higher and higher, and this type of large-span flexible structure has the characteristics of large flexibility, low frequency density, weak damping, and low stiffness. It is very vulnerable to the excitation of external disturbances to cause structural deformation and vibration, which will lead to the attenuation or even failure of the payload or attitude accuracy and stability performance

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