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Three-dimensional form inversion method based on optical measurement

A three-dimensional shape, optical measurement technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of three-dimensional shape, inversion and reconstruction of the overall structure that have not yet been realized, and achieve simple shape inversion algorithm, simple layout, and measurement. The effect of a small number of points

Inactive Publication Date: 2019-03-22
SHANGHAI AEROSPACE CONTROL TECH INST
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Problems solved by technology

At present, the vibration measurement technology based on PSD is mainly aimed at the end of the flexible structure or a specific position, and has not yet realized the inversion and reconstruction of the three-dimensional shape of the overall structure.

Method used

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  • Three-dimensional form inversion method based on optical measurement
  • Three-dimensional form inversion method based on optical measurement
  • Three-dimensional form inversion method based on optical measurement

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] The overall technical scheme of the present invention is as figure 1 As shown, it specifically includes the following implementation steps:

[0038] Step 1: Use the finite element method or test method to conduct modal analysis on the flexible structure under test to obtain the main mode shape Ψ of the structure.

[0039] Step 2: Use the layout optimization method to optimize the number and position of PSDs and gyroscopes, obtain the positions of some feature points of the structure, and arrange sensors.

[0040] The specific optimization criterion and optimization algorithm can be selected according to the specific task requirements, such as the optimization criterion can choose shape reconstruction error, condition number criterion, modal confidence criterion, etc., and the optimization algorithm can choose genetic algori...

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Abstract

The invention provides a flexible structure three-dimensional form inversion method based on PSD optical measurement. The relative displacement of a feature point of a flexible structure is measured by utilizing a laser position sensor PSD, and meanwhile, a gyroscope is used for measurement and integration to obtain a corresponding structure rotation angle, so that the displacement is corrected; by using structural modal vibration type information obtained by pre-analysis of a finite element or a test method, the three-dimensional form of the whole flexible structure is obtained through vibration type superposition inversion. Compared with a traditional form inversion method based on optical fiber or other optical measurement means, the method has the advantages that the number of measuring points is small, the measuring frequency band is wide, distribution is easy, and an inverse algorithm is simple.

Description

technical field [0001] The invention belongs to the research field of deformation measurement and shape inversion technology of flexible structures, and relates to optical measurement and correction technology based on PSD, and overall shape reconstruction technology of flexible structures based on a small amount of measurement information. Background technique [0002] Deformation measurement and shape inversion of flexible structures are important foundations for structural force analysis and vibration control. In the field of aerospace, large flexible structures such as antennas and sailboards are prone to deformation or vibration in complex working environments, which will affect the performance of the entire system. It is of great significance to measure the deformation and shape reconstruction of these large flexible structures. At present, the morphological reconstruction of flexible structures can be roughly divided into contact and non-contact measurement methods. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 刘付成朱东方黄庭轩孙禄君黄静
Owner SHANGHAI AEROSPACE CONTROL TECH INST
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