Equivalent model of spatial random array vibration system on sound-absorbing computing for porous material

Abstract

Porous materials are currently the most widely used sound absorbing materials. Due to the complex sound absorption mechanism, there is no mature calculation method to analyze its sound absorption performance, which can not provide a theoretical support for the selection, analysis and design of porous sound absorbing materials. Establishing a simple and reasonable equivalent model is a prerequisite for the calculation of the acoustic properties of porous materials. The sound absorption mechanism of porous materials was explored, and the spatial topology of porous materials was reconstructed. According to the spatial characteristics of porous materials, a mass-spring-damped vibration system equivalent model of spatial random array is proposed and established. The boundary conditions of the porous sound absorbing material were studied to be equivalent to the load to analyze the sound absorbing performance. The impedance tube test method is used to verify the equivalent model of the spatial random array vibration system for the sound absorption calculation of porous materials. The results show that the simulation results of the acoustic equivalent model of porous materials are consistent with the experimental results. This research method provides technical support for the study of acoustic theoretical models of porous materials.