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 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.
Ing
Ros K
RK
Laboratoire Ondes et Acoustique, Institut Langevin, Université Paris 7-ESPCI-CNRS, UMR 7587, 10 rue Vauquelin, 75231 Paris Cédex 05, France. ros-kiri.ing@espci.fr
Etaix
Nicolas
N
Leblanc
Alexandre
A
Fink
Mathias
M