Stereovision measurement for surface deformation of sandwich plates with aluminum foam cores under high speed impact loading

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (16) : 122-127.

SHAN Bao-hua1, 2，ZHANG Bo-yi2，YAN Yu2

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Abstract

To measure surface deformation of sandwich plates with aluminum foam cores under high speed impact loading, this paper presents a stereovision-based surface deformation measurement method. The removing mean normalized gray cross-correlation coefficient is selected to realize area matching, the maximum and minimum parallactic restriction is acquired by adjusting the disparity range to eliminate the false parallax, and other four constraints are combined with the former to optimize the disparity map. Then 3D point clouds are calculated according to the parallel binocular stereovision model, and the surface deformation profile curves are acquired by using Delaunay triangulation. Moreover, the stereovision 3D measurement system for surface deformation is integrated based on MATLAB, the precision and comparison experiments of distance measurement are conducted to testify the validity and reliability of the proposed method. The surface deformation 3D measurement test of aluminum foam cores sandwich plates under high speed impact loading is also performed with the integrated system. The results indicate that the reconstructed 3D surface can accurately display the surface deformation of sandwich plates with aluminum foam cores under high speed impact loading. Accordingly, a brand new approach is obtained to measure surface deformation of target board under high speed impact loading.

Key words

stereovision / sandwich plate with aluminum foam cores / surface deformation / 3D / measurement

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SHAN Bao-hua1, 2，ZHANG Bo-yi2，YAN Yu2. Stereovision measurement for surface deformation of sandwich plates with aluminum foam cores under high speed impact loading[J]. Journal of Vibration and Shock, 2015, 34(16): 122-127

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