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Study of sound transmission through single- and double-walled plates with absorbing material: Experimental and analytical investigation

机译：通过吸收材料的单壁和双壁板传声的研究：实验和分析研究

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In this work, the authors study sound transmission through single- and double-walled thin rectangular plates of finite extent, theoretically and experimentally. For this purpose, statistical energy analysis (SEA) is developed to predict the sound transmission loss of the plates. The essential SEA parameters, modal density and loss factors, are calculated and expressions for the sound transmission loss based on the SEA method are presented for both single- and double-walled plates. In order to validate the analytical results obtained for the transmission loss, an experimental setup was constructed including two reverberant chambers and a plate structure. The plate was placed between two rooms and the rooms were made in such a way that the sound waves propagate from the source room to the receiving room only through the rectangular panel. The sound transmission losses evaluated from the SEA models are compared with the experimental results which show good agreement. Three experimental methods were used to measure the transmission loss: The transmission suite method, a sound intensity method with a direct approach and a sound intensity method with an indirect approach. It is shown that the sound intensity method with a direct approach is more accurate than the other methods. This latter method could predict the critical frequency of the plate with only 0.5% error, whereas the other two methods had an error of more than 5%. The effects of using absorbing materials with single-walled plates were investigated experimentally and the effects of filling the cavity of double-walled plates with absorbing materials were also studied analytically. It was found that filling the cavity of the double-walled plate with lightweight absorbing material such as fiberglass increases the sound transmission loss at the critical frequency from 39 dB to a value slightly more than 53 dB. Also about 45 dB improvement in noise reduction is achieved in comparison to a similar single-walled plate. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在这项工作中，作者在理论和实验上研究了通过有限范围的单壁和双壁薄矩形板的声音传播。为此，开发了统计能量分析（SEA）来预测板的声音传输损失。计算了基本的SEA参数，模态密度和损耗因子，并给出了基于SEA方法的单壁和双壁板的传声损耗表达式。为了验证获得的传输损耗的分析结果，构建了包括两个混响室和板结构的实验装置。将板放置在两个房间之间，房间的制作方式应使声波仅通过矩形面板从源房间传播到接收房间。将SEA模型评估的声音传输损耗与实验结果进行了比较，结果显示出很好的一致性。三种实验方法用于测量传输损耗：传输套件方法，直接方法的声音强度方法和间接方法的声音强度方法。结果表明，直接法声强法比其他方法更准确。后一种方法可以预测板的临界频率，而误差只有0.5％，而其他两种方法的误差都超过5％。实验研究了将吸收性材料用于单壁板的效果，并分析性地研究了用吸收性材料填充双壁板的空腔的效果。已发现，用轻质吸收材料（例如玻璃纤维）填充双壁板的空腔会使临界频率处的声音传输损耗从39 dB增加到略大于53 dB的值。与类似的单壁板相比，降噪效果也提高了约45 dB。 （C）2018 Elsevier Ltd.保留所有权利。

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