Simplified Microstructural Unit Model for the Study of Sound Absorption Behavior of Microporous Foam Materials

doi:10.7652/xjtuxb202111017

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Simplified Microstructural Unit Model for the Study of Sound Absorption Behavior of Microporous Foam Materials

更新时间：2025-07-09

- Simplified Microstructural Unit Model for the Study of Sound Absorption Behavior of Microporous Foam Materials
- Vol. 55, Issue 11, Pages: 154-161(2021)
- 作者机构：
  
  西安交通大学机械工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202111017
  CLC： O424;TB34
- Online First：10 November 2021，
  
  Published：2021
- 稿件说明：
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Simplified Microstructural Unit Model for the Study of Sound Absorption Behavior of Microporous Foam Materials[J]. 2021, 55(11): 154-161.
DOI：

Simplified Microstructural Unit Model for the Study of Sound Absorption Behavior of Microporous Foam Materials[J]. 2021, 55(11): 154-161. DOI： 10.7652/xjtuxb202111017.

摘要

针对微孔泡沫材料的吸声系数通过其微观结构尺寸难以定量预测的难题

提出利用微孔泡沫铝的电镜扫描技术建立微孔泡沫铝微观结构的简化单元模型。利用该模型模拟微孔泡沫铝微观结构的拓扑结构

可以建立单元拓扑特征与关键的非声学参数包括静态流阻、黏性特征长度、热特征长度、曲折系数等之间的关系。在简化单元模型的基础上引入开孔率

明确了微孔泡沫材料的孔隙率和曲折度之间的关系

提高了预测微孔泡沫铝吸声系数的准确度。采用B-K阻抗管测量微孔泡沫铝试件的吸声系数

实验测量结果和理论预测结果一致。研究过程中制备的厚度小于30 mm的微孔泡沫铝试件在1 100～6 500 Hz频段内实现了平均吸声系数达0.8的宽频高效吸声。该研究工作可为设计、优化和制备具有更好吸声性能的微孔泡沫材料提供一定的参考。

Abstract

Aiming at the difficulty of quantitatively predicting the sound absorption coefficient of a microstructural foam material through its microstructure size

an SEM method is proposed to establish a simplified unit model of the microstructural aluminum foam. Using this model to simulate the topology of the microstructural aluminum foam

the relationship between the unit's topological characteristics and the key non-acoustic parameters

including static flow resistance

viscous characteristic length

thermal characteristic length

and tortuosity coefficient

can be established. On the basis of the simplified unit model

the open porosity is introduced to clarify the relationship between the porosity and tortuosity of the microstructural foam material. So the accuracy for predicting the sound absorption coefficient of the microstructural aluminum foam is improved. The BK impedance tube is used to measure the sound absorption coefficient of the microstructural aluminum foam specimen

and the experimental measurement results are consistent with the theoretical prediction results. The specimens with a thickness less than 30 mm prepared in this research achieve broad-band and high-efficiency sound absorption

with an average sound absorption coefficient of 0.8 in the 1 100-6 500 Hz frequency band. This research may provide a basis for the design

optimization and preparation of microstructural foam materials with better sound absorption behavior.

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references

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