BINOCULAR STEREO VISION MEASUREMENT RESEARCH FOR SUPERPLASTIC FREE BULGING

doi:10.3724/SP.J.1037.2013.00611

Acta Metall Sin

2014, Vol. 50

Issue (4): 471-478 DOI: 10.3724/SP.J.1037.2013.00611

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BINOCULAR STEREO VISION MEASUREMENT RESEARCH FOR SUPERPLASTIC FREE BULGING

MA Pinkui(

), SONG Yuquan

Superplastic and Plastic Research Institute, Jilin University, Changchun 130025

Cite this article:

MA Pinkui, SONG Yuquan. BINOCULAR STEREO VISION MEASUREMENT RESEARCH FOR SUPERPLASTIC FREE BULGING. Acta Metall Sin, 2014, 50(4): 471-478.

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Abstract

It is a significant foundation of superplastic free bulging analytic theory to accurately measure the surface profile and the deformation of each point on surface. Based on an important feature of the profile of the free bulging part which can be depicted as axisymmetric rotating surface, in this study, the measurement of the surface was translated into that of the feature points on the part surface, and the three-dimensional coordinates of these points were measured by the binocular stereo vision system for the first time. Then, through curve fitting, contour surface and geometric parameters were determined, and the strain were characterized through analyzing coordinates change of the feature points and distance change between two adjacent points. The setup and the measuring method of the vision system were introduced, as well as several key steps, such as system model, calibration method, elimination of influence of high temperature, and image processing. The methods were proposed for measuring geometric parameters and deformation of bulging part , and the related experiments were performed.

Key words: superplasticity free bulging binocular stereo vision measurement

Received: 02 December 2013

ZTFLH:

TH871

Fund: Supported by National Natural Science Foundation of China (Nos.51005099 and 51005098) and Natural Science Foundation of Jilin Province (No.201115015)

About author: null

马品奎, 男, 1975年生, 副教授, 博士

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00611 OR https://www.ams.org.cn/EN/Y2014/V50/I4/471

Fig.1

立体视觉系统构成

Fig.2

自由胀形测量示意图

Fig.3

双目立体视觉模型示意图

Fig.4

实验装置

Feature point	Coordinate measured by vision system (r, h)	Coordinate measured by manual measurement (r, h)
0	(0.00, 71.105)	(0.00, 72.34)
1	(16.342, 69.424)	(16.82, 69.72)
2	(27.738, 65.548)	(28.34, 64.00)
3	(36.385, 56.109)	(37.60, 56.32)
4	(43.219, 48.492)	(43.88, 48.88)
5	(47.679, 38.752)	(48.78, 39.82)
6	(51.152, 30.043)	(51.88, 30.82)
7	(53.362, 23.486)	(53.22, 22.80)
$r$ _max	(53.752, 17.820)	(53.46, 17.50)
8	(53.418, 15.278)	(53.20, 14.36)
9	(52.725, 7.619)	(52.10, 7.00)
10	(50.00, 0.00)	(50.00, 0.00)

表1 胀形件轮廓表面被测特征点坐标

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