Abstract
An experimental study on the effect of bending vibration on the acoustic properties of thin porous plates is presented. Poroelastic plates are tested in a large impedance tube in the lower frequency range. It is shown that bending vibration can be excited by the incident sound and detected by measuring 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 plate are shown. The data from the large and small impedance tubes illustrate how these effects are reduced with the reduced size of the plate.
Highlights
There are a number of studies which have been carried out on the vibration of plates and structural damping
These figures seem to confirm that the vibration of certain modes in a clamped, porous, elastic plate can be generated by airborne sound in the low frequency range
The resonance frequencies seem to be close to predictions given by the standard theory of plates. These results show a noticeable enhancement of the absorption coefficient at some frequencies in the low frequency domain where the acoustic absorption is generally low
Summary
There are a number of studies which have been carried out on the vibration of plates and structural damping. These have primarily been to investigate behavior of plates which are made from nonporous materials. The low rigidity in the thickness of these materials allows compressions and expansions of the porous layer associated with the passage of the airborne acoustic wave. In such a case, the rigid frame approximation where the solid is immobile is no longer valid
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