Caracterización de la impedancia de transferencia de materiales porosos-fibrosos usando holografía acústica de campo cercano (NAH)

1. Jeniffer Torres
2. Jaime Ramis
3. Maxence Petite
4. Jesús Carbajo
5. Enrique Segovia

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Abstract

In this paper, the technique Near-field Acoustic Holography (NAH) is applied to determine the surface vibration velocity of a layer of porous material attached to a circular metal plate that emulates a rigid piston. The velocity data is necessary to calculate the transfer impedance of the absorber material. In the proposed experience, the metallic plate vibrates by the action of an actuator located in its center transmitting the vibration of the plate to the porous layer. The experiment and the technique implemented are based on the assumption of decoupling vibrational and acoustic behavior of the plate-porous structure to determine the radiation efficiency

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