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Sound absorption by clamped poroelastic plates

Aygun, Haydar. (2008). Sound absorption by clamped poroelastic plates. The Journal of the Acoustical Society of America (JASA), 27 July 2008, 124 (3), pp. 1550-1556

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Abstract

Measurements and predictions have been made of the absorption coefficient and the surface acoustic impedance of poroelastic plates clamped in a large impedance tube and separated from the rigid termination by an air gap. The measured and predicted absorption coefficient and surface impedance spectra exhibit low frequency peaks. The peak frequencies observed in the absorption coefficient are close to those predicted and measured in the deflection spectra of the clamped poroelastic plates. The influences of the rigidity of the clamping conditions and the width of the air gap have been investigated. Both influences are found to be important. Increasing the rigidity of clamping reduces the low frequency absorption peaks compared with those measured for simply supported plates or plates in an intermediate clamping condition. Results for a closed cell foam plate and for two open cell foam plates made from recycled materials are presented. For identical clamping conditions and width of air gap, the results for the different materials differ as a consequence mainly of their different elasticity, thickness, and cell structure.

Item Type: Article
Uncontrolled Keywords: acoustic impedance, acoustic wave absorption, plates (structures), shear modulus, structural acoustics
Subjects: SCIENCE > Physics
TECHNOLOGY > Engineering (General)
TECHNOLOGY > Mechanical Engineering
Faculties: Maritime and Technology Faculty > Faculty of Maritime and Technology (other)
Depositing User: Haydar Aygun
Date Deposited: 07 Feb 2013 11:42
Last Modified: 06 Jul 2014 18:34
URI: https://ssudl.solent.ac.uk/id/eprint/2401

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