Measurement of thickness or plate velocity using ambient vibrations

Assuming the Green's function is linear with respect to the boundary conditions, it is demonstrated that flexural waves detected by a point receiver and a circular array of point receivers centered on the previous receiver are proportional regardless location of the source and geometry of the p...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2010-06, Vol.127 (6), p.EL252-EL257
Main Authors: Ing, Ros K., Etaix, Nicolas, Leblanc, Alexandre, Fink, Mathias
Format: Article
Language:English
Subjects:
Acoustical measurements and instrumentation
Acoustics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Structural acoustics and vibration
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Summary:Assuming the Green's function is linear with respect to the boundary conditions, it is demonstrated that flexural waves detected by a point receiver and a circular array of point receivers centered on the previous receiver are proportional regardless location of the source and geometry of the plate. Therefore determination of plate velocity or thickness is done from the measurement of ambient vibrations without using any emitter. Experimental results obtained with a plate of non regular geometry excited with a single transducer or a remote loudspeaker are shown to verify the theoretical approach.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3431096