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Determination of vibration parameters of a large-scale structure by measuring the visibility changes on the time-averaged images of a sinusoidal pattern fixed on it

Determination of vibration parameters of a large-scale structure by measuring the visibility... Specification of vibration modes, amplitudes, and damping coefficients of structures are crucial issues in civil and mechanical engineering. Several techniques have been used for this kind of studies, including holographic interferometry, speckle interferometry, and moire´ technique. But, for a large-scale structure, the modal analysis technique is usually used. We use the time-averaged digital image of a sinusoidal pattern fixed on a vibrating 6-m iron I-beam to study in-plane vibration. The study includes specification of vibrating modes, amplitudes, and damping coefficients. Using a wide-angle high-resolution digital camera, successive images of the vibrating pattern are recorded in exposure times much longer than the vibration period and much shorter than the relaxation time. The visibility measurement along the images leads to the specification of the mentioned parameters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Optical Engineering SPIE

Determination of vibration parameters of a large-scale structure by measuring the visibility changes on the time-averaged images of a sinusoidal pattern fixed on it

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Publisher
SPIE
Copyright
Copyright © 2008 Society of Photo-Optical Instrumentation Engineers
ISSN
0091-3286
eISSN
1560-2303
DOI
10.1117/1.2927460
Publisher site
See Article on Publisher Site

Abstract

Specification of vibration modes, amplitudes, and damping coefficients of structures are crucial issues in civil and mechanical engineering. Several techniques have been used for this kind of studies, including holographic interferometry, speckle interferometry, and moire´ technique. But, for a large-scale structure, the modal analysis technique is usually used. We use the time-averaged digital image of a sinusoidal pattern fixed on a vibrating 6-m iron I-beam to study in-plane vibration. The study includes specification of vibrating modes, amplitudes, and damping coefficients. Using a wide-angle high-resolution digital camera, successive images of the vibrating pattern are recorded in exposure times much longer than the vibration period and much shorter than the relaxation time. The visibility measurement along the images leads to the specification of the mentioned parameters.

Journal

Optical EngineeringSPIE

Published: May 1, 2008

Keywords: vibration analysis; time-averaged imaging; sinusoidal grating; digital image analysis; large-scale structures

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