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

A technology of porous materials and sound absorption coefficient, applied in the field of porous sound-absorbing materials, can solve the problems of discontinuous medium dynamic damage, microscopic model does not consider damping, acoustic performance analysis has no application, etc., and achieves the effect of simplifying complex calculations

Active Publication Date: 2019-02-26
SHANDONG UNIV OF TECH
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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 th...

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

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Embodiment Construction

[0041] Below in conjunction with example and accompanying drawing, the present invention will be further described.

[0042] The invention is a method for calculating the sound absorption coefficient of a porous material, comprising the following steps:

[0043] Step 1: Based on the equivalent theory of acoustic-mechanical circuit analogy, carry out the equivalent sound absorption model of a single hole, and determine the stiffness k and damping loss factor η of the equivalent sound absorption model of a single hole;

[0044] Firstly, the three-dimensional model diagram of the porous material reconstructed from the CT scan simplifies the single-pore structure, such as Figure 4 As shown, the cavity volume V of the single-hole structure is measured and calculated 0 , the opening area S of a single hole, and the number of openings n of a single hole.

[0045] The equivalent calculation formula of stiffness k is:

[0046]

[0047] C=C m S 2

[0048]

[0049] Among the...

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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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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/10G06F30/23Y02T90/00
Inventor 李丽君孙丰山
Owner SHANDONG UNIV OF TECH
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