Study on acoustic properties of multilayer impedance materials

Abstract

Abstract Composite materials are produced using advanced material preparation techniques to optimize a combination of materials with different properties to form new materials. Such materials have the composite properties of their constituent materials. Composite materials have been widely explored for their use in the field of acoustic noise reduction as well as in automobile, aviation, and other fields. To further enhance the acoustic characteristics of composite materials, this letter proposes a multilayer composite structure comprising a resistive screen structure material (perforated screen material), foam, and fiber. The impedance tube method is used to investigate the rigid wall absorption performance and flow field transmission loss in seven types of resistive screen composite materials of various flow resistivities and porosities. The results show that the acoustic absorption and acoustic insulation performance of the resistive screen composite material are better than the foam–fiber multilayer material. The maximum acoustic absorption coefficient reached 0.95 at 3000 Hz and the maximum difference in sound reduction was 6.5dB. This resistive screen material provides a new dimension to the design of new materials.