A Tandem Marker-Based Motion Capture Method for Dynamic Small Displacement Distribution Analysis
Zulhaj Aliansyah*1, Kohei Shimasaki*2, Mingjun Jiang*1, Takeshi Takaki*1, Idaku Ishii*1, Hua Yang*3, Chikako Umemoto*4, and Hiroshi Matsuda*5
*1Department of System Cybernetics, Graduate School of Engineering, Hiroshima University
1-4-1 Kagamiyama, Higashi-Hiroshima-shi, Hiroshima 739-8527, Japan
*2Digital Modozukuri (Manufacturing) Education and Research Center, Hiroshima University
3-10-32 Kagamiyama, Higashi-Hiroshima-shi, Hiroshima 739-0046, Japan
*3School of Mechanical Science and Engineering, Huazhong University of Science and Technology
1037 Luoyu Road, Wuhan, Hebei 430074, China
*4Keisoku Research Consultant Co.
1-665-1 Fukuda, Higashi-ku, Hiroshima-shi, Hiroshima 732-0029, Japan
*5Department of Structural Engineering, Nagasaki University
1-14 Bunkyo-machi, Nagasaki-shi, Nagasaki 852-8521, Japan
This study proposes a novel vision-based measurement method to capture small dynamic displacements at many points on a large-scale structure. The measurement points are aligned in the depth direction so that all points are observable in a single field of view with a high power zoom lens. To cope with insufficient incident light and lens blur when capturing video in a limited depth of field with large magnification, our method used highly retroreflective cubes as markers, combined with a strong coaxial lighting device for measuring image displacements with a tandem-layout in images. We conducted experiments to measure dynamic displacements of a 4 m long truss bridge model, and 18 corner cubes were attached as retroreflective markers. 752×2048 images were captured with a coaxial lighting device at 240 fps. The experimental results show that the deformation of the bridge model, its resonant frequencies, and mode shapes at a frequency of dozens of Hz can be determined by analyzing images captured from a single camera view.
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