On the effect of the bending vibration on the acoustic properties of thin poroelastic plates

An experimental study on the effect of bending Vibration on the acoustic pr operties of thin porous plates is presented. Poroelastic plates are tested in a large impedance tube in the lower frequency range. It is shown that be nding vibration can be excited by the incident sound and detected by measur ing the acoustic impedance of a plate. This effect together with the effect of the flow resistivity on the values of the acoustic impedance of the pla te are shown. The data from the large and small impedance tubes illustrate how these effects are reduced with the reduced size of the plate. (C) 2000 Acoustical Society of America. [S0001-4966(00)00803-1].