Flexible Videogrammetric Technique for Three-Dimensional Structural Vibration Measurement
Publication: Journal of Engineering Mechanics
Volume 133, Issue 6
Abstract
A videogrammetric technique is proposed for measuring three-dimensional structural vibration response in the laboratory. The technique is based on the principles of close-range digital photogrammetry and computer vision. Two commercial-grade digital video cameras are used for image acquisition. To calibrate these cameras and to overcome potential lens distortion problems, an innovative two-step calibration process including individual and stereo calibration is proposed. These calibrations are efficiently done using a planar pattern arbitrarily shown at a few different orientations. This special characteristic makes it possible to perform an on-site calibration that provides flexibility in terms of using different camera settings to suit various application conditions. To validate the proposed technique, three tests, including sinusoidal motion of a point, wind tunnel test of a cross-section bridge model, and a three-story building model under earthquake excitation, are performed. Results indicate that the proposed videogrammetric technique can provide fairly accurate displacement measurement for all three tests. The proposed technique is shown to be a good complement to the traditional sensors for measuring two- or three-dimensional vibration response in the low-frequency range.
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Acknowledgments
This study is supported by the Hong Kong Research Grants Council Competitive Earmarked Research Grant HKUST6294/03E.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 133 • Issue 6 • June 2007
Pages: 656 - 664
Copyright
© 2007 ASCE.
History
Received: Jul 26, 2005
Accepted: Sep 13, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Henri P. Gavin
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