A method for calculating a sound absorption coefficient of a porous material

Abstract

The invention discloses a method for calculating a sound absorption coefficient of a porous material, comprising the following five steps: Step 1: the sound absorption model of the single hole is equivalent, including obtaining the stiffness k of the single hole sound absorption equivalent model based on the analogy equivalent theory of the acoustic force line, and obtaining the damping loss factor eta through the sound absorption simulation calculation of the single hole; Step 2: creating a random distribution function, generating a 3D Voronoi diagram in Matlab software, and getting the coordinates of the point; Step 3: performing modeling with the Java language combined with Matlab and finite element analysis software; Step 4: establishing a spatial random array mass-spring-damping system equivalent model of the porous material; Step 5: performing simulation analysis to obtain the energy loss curve, that is, the sound absorption coefficient curve. The invention can establish an acoustic equivalent model of the porous material which is simple and applicable, and simplifies the complicated calculation of the sound absorption performance of the porous material; the method reduces the design and experiment cost, and accelerate the development speed of the product.

Description

technical field [0001] The invention relates to a space random array equivalent model, in particular to a method for calculating the sound absorption coefficient of a porous material, and belongs to the technical field of porous sound-absorbing materials. Background technique [0002] Porous materials are currently the most widely used sound-absorbing materials. Due to the complexity of the sound-absorbing mechanism, there is no mature calculation method to analyze its sound-absorbing performance, which cannot provide theoretical support for the selection, analysis and design of porous sound-absorbing materials. . [0003] Since the 1960s, the research on the sound absorption of porous materials has been mainly based on testing. According to the macroscopic and microscopic material parameters obtained from experimental tests, the laws of sound absorption of porous materials are determined by summarizing and statistically summarizing empirical data. The empirical and semi-em...

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Problems solved by technology

Although these models have achieved partial success in predicting the sound absorption performance of porous materials, they ignore the inhomogeneity of the real structure density distribution, cannot well reflect the randomness of porous structures, and cannot clearly understand the mechanism of porous materials. Energy dissipation is explained, and some physical characteristics of sound waves in the propagation process cannot be studied

[0005] The discrete spring element method is used to simulate porous materials, and the equivalent mass-spring model is established to solve the problem of dynamic failure of discontinuous media. Some research results have been achieved in the field of porous material failure, but most of the microscopic models do not consider damping. There is no app yet for analytics

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