Aluminum fine particle sintering material of Sound absorption characteristics

Abstract

In the automobile industry in recent years, engine noise has been decreasing due to the spread of HVs and EVs. However, low-frequency noise such as road noise and wind noise is prominent. further, Due to issues such as fuel efficiency regulations for automobiles, the development of lightweight and high-performance sound absorbing materials is urgently needed. Therefore, aluminum sintered material is attracting attention. It is known that its performance changes depending on the particle size and porosity of aluminum powder. In this study, we created a microscopic structure model of the aluminum sintered material, calculated the sound absorption coefficient and flow resistance using the homogenization method, and affected the porosity of the aluminum sintered material and the particle size of the aluminum powder on the sound absorption characteristics. Is examined. The purpose is to design a higher performance sound absorbing material.