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Investigation of Sound Absorption Feature of Closed-Cell Aluminum Foams Combined with Porous Materials

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In order to improve closed-cell aluminum foam (CCAF) unimodal absorption, and to solve the problem of narrow frequency absorption band, the perforated CCAF boards were combined with porous materials to form a composite structure. The standing-wave-tube sound absorption tester was used to measure the sound absorption coefficient (SAC). The sound absorption coefficient peak value (SACPV), half-peak width (HPW), noise reduction coefficient (NRC), and absorption-peak centre frequency (APCF) were measured to characterize sound absorption properties for CCAF. The results showed that SAC was improved up to 0.98 by covering a soft sound-absorbing cloth on the surface of the perforated CCAF sample. In addition, the main sound absorption frequency band broadened. The addition of glass wool with different thickness is conductive to the low-frequency SAC of perforated CCAF.
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Keywords: CLOSED-CELL FOAM ALUMINUM (CCAF); GLASS WOOL; PERFORATION; SOUND ABSORPTION COEFFICIENT (SAC); SOUND-ABSORBING CLOTH

Document Type: Short Communication

Publication date: March 1, 2017

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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