| 基于流阻率的吸声材料声学性能研究 |
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| 引用本文： | 向建华,廖日东,蒲大宇.基于流阻率的吸声材料声学性能研究[J].北京理工大学学报,2009,29(11):1018-1022. |
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| 作者姓名： | 向建华 廖日东 蒲大宇 |
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| 作者单位： | 北京理工大学,机械与车辆学院,北京,100081;北京理工大学,机械与车辆学院,北京,100081;北京理工大学,机械与车辆学院,北京,100081 |
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| 基金项目： | 国家"九七三"计划项目 |
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| 摘 要： | 运用加权残值法建立了两种介质相互作用的声学有限元计算方程式. 基于多孔纤维材料等效流体的经验公式,分析了复声速和复密度相对流阻率的变化规律. 针对不同多孔吸声材料结构布置形式,采用上述有限元计算方程和经验公式,计算得到随流阻率变化的传递损失. 结果表明,空气滤清器型结构传递损失随流阻率增加而增加;阻性消声器型结构传递损失随流阻率而变化的规律复杂,在计算频段内存在峰值.
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| 关 键 词： | 流阻率 多孔材料 复声速 复密度 传递损失 |
| 收稿时间： | 3/5/2009 12:00:00 AM |
Performance of Sound-Absorbing Material Based on Flow Resistivity |
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| XIANG Jian-hu,LIAO Ri-dong and PU Da-yu.Performance of Sound-Absorbing Material Based on Flow Resistivity[J].Journal of Beijing Institute of Technology(Natural Science Edition),2009,29(11):1018-1022. |
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| Authors: | XIANG Jian-hu LIAO Ri-dong and PU Da-yu |
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| Institution: | School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | Utilizing Galerkin method, the finite element equation of acoustic interaction between two media is established. Based on the empirical equations of porous material considered as a fluid, the rules between the complex speed&density and flow resistivity are analyzed. According to the finite element equation and the empirical equations, two different porous material structures' transmission loss(TL) versus the flow resistivity are attained. The results showed that the TL of air cleaner will increases with the increase of flow resistivity, but the TL of resistance muffler has a complicated change and exists a maximal value within the calculation frequency. |
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| Keywords: | flow resistivity porous material complex density complex speed transmission loss |
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