Microstructural design to improve sound absorption performance of aluminum sintered material

Abstract

Aluminum and aluminum sintered materials are used for the walls and ceilings of houses and airports to ensure quietness. It is known that the aluminum sintered material can change the sound absorption characteristics depending on the size of the back air layer, and the larger the back air layer, the lower the peak of the sound absorption coefficient. However,the influence of the thickness of the aluminum sintered material and the grain size of the aluminum powder on the sound absorption characteristics has not been sufficiently investigated. In this study, we made a microscopic structural model of aluminum sintered material, calculated the sound absorption coefficient and flow resistance using the homogenization method, and examined the influence of the thickness of aluminum sintered material and the particle size of aluminum powder on the sound absorption .