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Proceedings Paper

System identification by video image processing
Author(s): Masanobu Shinozuka; Hung-Chi Chung; Makoto Ichitsubo; Jianwen Liang
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Paper Abstract

Emerging image processing techniques demonstrate their potential applications in earthquake engineering, particularly in the area of system identification. In this respect, the objectives of this research are to demonstrate the underlying principle that permits system identification, non-intrusively and remotely, with the aid of video camera and, for the purpose of the proof-of-concept, to apply the principle to a system identification problem involving relative motion, on the basis of the images. In structural control, accelerations at different stories of a building are usually measured and fed back for processing and control. As an alternative, this study attempts to identify the relative motion between different stories of a building for the purpose of on-line structural control by digitizing the images taken by video camera. For this purpose, the video image of the vibration of a structure base-isolated by a friction device under shaking-table was used successfully to observe relative displacement between the isolated structure and the shaking-table. This proof-of-concept experiment demonstrates that the proposed identification method based on digital image processing can be used with appropriate modifications to identify many other engineering-wise significant quantities remotely. In addition to the system identification study in the structural dynamics mentioned above, a result of preliminary study is described involving the video imaging of state of crack damage of road and highway pavement.

Paper Details

Date Published: 30 July 2001
PDF: 11 pages
Proc. SPIE 4330, Smart Structures and Materials 2001: Smart Systems for Bridges, Structures, and Highways, (30 July 2001); doi: 10.1117/12.434109
Show Author Affiliations
Masanobu Shinozuka, Univ. of Southern California (United States)
Hung-Chi Chung, Univ. of Southern California (United States)
Makoto Ichitsubo, Kure National College of Technology (Japan)
Jianwen Liang, Tianjin Univ. (United States)

Published in SPIE Proceedings Vol. 4330:
Smart Structures and Materials 2001: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu, Editor(s)

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