1 June 1998 Detecting damage in vibrating structures with a scanning LDV
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Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307730
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy
Abstract
It has been demonstrated through experiments on steel and concrete laboratory structures that structural defects or faults, as determined by changes in the dynamic properties or response of structures, can be detected and located using a continuously-scanning Laser Doppler Vibrometer (LDV) if vibration to flex the defects can be induced and if the defects are such as to produce localised mode shape discontinuities. This paper describes such a defect detection method using a short linear LDV scan across the crack location. It has been observed that through cracks are easily detected in thin plates whereas narrow slots in a solid cantilever beam have no easily-identifiable effect on its mode shapes unless cracks extend more than half way through the thickness. Cracks in a reinforced-concrete beam were found to introduce marked and identifiable discontinuities in mode shapes. Keywords: LDV, Vibration, Scanning, Measurement, Cracks, Damage, Structures, Mode Shapes, Modal Analysis, Concrete Beams
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Z. Khan, A. Z. Khan, Anthony B. Stanbridge, Anthony B. Stanbridge, David J. Ewins, David J. Ewins, } "Detecting damage in vibrating structures with a scanning LDV", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); doi: 10.1117/12.307730; https://doi.org/10.1117/12.307730
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