Structural modal parameter identification system based on binocular stereo vision

A binocular stereo vision and structural modal technology, applied in the field of image vision, can solve the problems of no longer applicable, large-scale layout, affecting the modal parameters of lightweight structures, etc., and achieve the effects of low cost, high precision and fast speed.

Active Publication Date: 2013-09-25
TSINGHUA UNIV
View PDF6 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional vibration test based on contact measurement is no longer suitable for the identification of modal parameters of some modern engineering structures due to problems such as affecting the modal parameters of l

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Structural modal parameter identification system based on binocular stereo vision
  • Structural modal parameter identification system based on binocular stereo vision
  • Structural modal parameter identification system based on binocular stereo vision

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] In order to illustrate the technical solution and content of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the structural mode parameter identification system of the present invention includes a camera device, a data acquisition and processing device. The camera device includes two camera units, which are basically arranged in parallel with a distance of 90mm between left and right, and are fixed on the support unit.

[0027] figure 2 Shown is a flow chart of structural modal parameter identification according to the present invention. The specific process includes the following steps.

[0028] Step 1, build a binocular stereo vision system, perform calibration, and obtain the internal parameters and mutual external parameters of the two camera units; through three-dimensional stereo correction, obtain the line alignment mapping an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a structural modal parameter identification system based on binocular stereo vision. The method of the system comprises the following steps of building a binocular stereo vision system, calibrating two camera units, and acquiring internal and external parameters of the two camera units to carry out three-dimensional correction; establishing easily identifiable key points of a detected structure surface; loading impact force to enable the detected structure to move freely, obtaining a synchronic image sequence file, identifying the three-dimensional coordinates of all key points to each frame of image orderly, and obtaining the three-dimensional movement data of all key points in the whole test time finally; through the three-dimensional movement data of all key points, carrying out modal identification by using a characteristic system realization algorithm, obtaining the modal parameters of the detected structure, and outputting a result. Compared with the traditional technology, the structural modal parameter identification system can measure the modal parameters of the detected structure in a non-contact way or in a way that less impact is applied to the detected structure, and the system has the advantages of low cost, fast speed and high precision and is especially suitable for the modal parameter measurement of large lightweight structure with inconvenient layout of sensors.

Description

technical field [0001] The invention belongs to the intersecting field of image vision field and dynamic modal parameter identification, and relates to establishment of a binocular stereo vision system, identification of key points, calculation of three-dimensional motion data, and identification algorithm of structural modal parameters. Background technique [0002] Structural modal parameter identification is an important means for the design and analysis of structural dynamic performance. Online modal parameter identification has important application value for active control of structural vibration, damage identification, fault prediction and diagnosis, and structural health monitoring. The development of modern engineering structures tends to be lightweight and large-scale, and some structures even work in extreme environments, such as high temperature and outer space. The traditional vibration test based on contact measurement is no longer suitable for the identificati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01M7/08G06T7/00G06T7/80
Inventor 何家玮顾永鹏赵治华任革学马彦会杨程王宁羽
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap