| 应用传递矩阵测量中间薄层材料声特性 |
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| 引用本文： | 汪婕,冯涛,杨梦露,王晶. 应用传递矩阵测量中间薄层材料声特性[J]. 声学技术, 2019, 38(3): 334-339 |
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| 作者姓名： | 汪婕 冯涛 杨梦露 王晶 |
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| 作者单位： | 北京工商大学材料与机械工程学院 |
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| 摘 要： | 将薄层材料看作三层复合材料的中间层,通过实测得到材料的总传递矩阵和前后两层材料的传递矩阵,中间层材料的传递矩阵可由前材料传递矩阵的逆矩阵、组合材料整体传递矩阵和后材料传递矩阵的逆矩阵相乘得到,由传递矩阵可计算得到中间层材料的声学特性。以基毡和海绵材料为例,通过实验研究并验证中间层材料声特性计算方法的准确性。该方法为薄层材料法向吸收系数和隔声量的测量提供了新的手段。
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| 关 键 词： | 声吸收系数|薄层材料|传递矩阵|中间层 |
| 收稿时间： | 2018-10-09 |
| 修稿时间： | 2018-11-02 |
Acoustic characteristic measurement of intermediate thin layer materials by transfer matrix |
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| WANG Jie,FENG Tao,YANG Meng-lu and WANG Jing. Acoustic characteristic measurement of intermediate thin layer materials by transfer matrix[J]. Technical Acoustics, 2019, 38(3): 334-339 |
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| Authors: | WANG Jie FENG Tao YANG Meng-lu WANG Jing |
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| Affiliation: | School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China,School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China,School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China and School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China |
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| Abstract: | By considering a thin layer material as the intermediate layer of three-layer composites and by measuring the overall transfer matrix of the three-layer composites and the transfer matrices of the front and rear layers of the composites, the transfer matrix of the intermediate layer material can be obtained by multiplying the inverse matrix of the transfer matrix of the front layer with the overall transfer matrix of the three-layer composites and again with the inverse matrix of the transfer matrix of the rear layer. Then, the acoustic properties of the intermediate layer material can be calculated from its transfer matrix. Taking the base felt and sponge material as examples, the accuracy of the calculation method for the acoustic properties of the intermediate layer material is studied and verified by experiments. This is a new method of measuring the normal acoustic absorption coefficient and sound transmission loss of thin layer materials. |
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| Keywords: | acoustic absorption coefficient|thin layer material|transfer matrix|intermediate layer |
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