Acoustic Absorption Characteristics of Closed Cell Aluminium Foam
Experimental investigation of sound absorption characteristics of aluminium foam is carried out under laboratory test conditions. The studies revealed that the developed aluminium foam have excellent sound absorption properties and is comparable with other sound absorbing materials. Excellent sound absorption property coupled with good mechanical properties makes this material ideal for sound absorption under difficult situations. Experimental results revealed that the thickness of the specimen affects the sound absorption properties of the material, and there exists an optimal thickness, at which sound absorption coefficient is maximum. Experimental evidence showed that presence of damaged cell edges, open and/or semi-open cells in the specimen surface, enhances the sound absorption capability of the material.
J. Ghose et al., "Acoustic Absorption Characteristics of Closed Cell Aluminium Foam", Applied Mechanics and Materials, Vols. 110-116, pp. 1145-1149, 2012