Research on sound absorption properties of laminated mixture sound absorbing materials

Abstract

In this paper, the mixing design test method is introduced into the research of sound absorbing material, and the method of laminated mixture sound absorbin g material are put forward. A statistical energy model is established to calculate the sound absorption coefficient of sound absorbing materials, and the sound absorption characteristics of three kinds of sound absorbing materials, such as superfine glass fiber, hemp wool and polyurethane, are studied by simulation, and the accuracy and validity of simulation results are verified by impedance tube experiment. In addition, the method of laminated design of sound absorbing material is discussed, and the regression equation of sound absorption coefficient under each frequency band is obtained. In order to achieve the sound absorbing effect of the absorption coefficient of the target, the optimization of the proportion of three kinds of ingredients is carried ou t by using the mixture design method, so that the attention frequency band’s sound absorption effect is precisely controlled, which provides a new way to improve the noise control of the sound absorbing material.