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

Saifollah Rasouli; Mohammad Taghi Tavassoly

doi:10.1117/1.2927460

1 May 2008 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

Saifollah Rasouli, Mohammad Taghi Tavassoly

Author Affiliations +

Optical Engineering, Vol. 47, Issue 5, 053603 (May 2008). https://doi.org/10.1117/1.2927460

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 moiré 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.

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Saifollah Rasouli and Mohammad Taghi Tavassoly "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," Optical Engineering 47(5), 053603 (1 May 2008). https://doi.org/10.1117/1.2927460

Published: 1 May 2008

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