Wang Shuping, Tao Jiancheng, Qiu Xiaojun, Burnett Ian S
Centre for Audio, Acoustics and Vibration, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, Australia.
Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing, China.
Sci Rep. 2021 Mar 18;11(1):6292. doi: 10.1038/s41598-021-85796-0.
It has been demonstrated that a staggered window achieves better noise reduction performance than a traditional single glazing one at middle to high frequencies while maintaining a degree of natural ventilation. There is, however, little improvement in the low frequency range. In contrast, this work proposes to apply coiled-up silencers consisting of coupled tubes on the side walls of staggered windows to obtain noise attenuation in a broad band, especially in the low frequency range. Each element in the silencer consists of two coupled tubes with different cross sections so that noise at more frequencies can be attenuated than that with a uniform cross section. The simulation results show that 8.8 dB overall insertion loss can be obtained between 100 and 500 Hz after applying a combination of silencers designed at 7 different frequencies, and the insertion loss of the staggered window is increased from 6.7 to 15.6 dBA between 100 and 2000 Hz for normal incident traffic noise with the proposed silencers installed. The design is validated by the experiments with a 1:4 scale down model.
已经证明，交错式窗户在中高频段比传统单层玻璃窗户具有更好的降噪性能，同时能保持一定程度的自然通风。然而，在低频范围内几乎没有改善。相比之下，这项工作提出在交错式窗户的侧壁上应用由耦合管组成的盘绕式消声器，以在宽带范围内，特别是在低频范围内获得噪声衰减。消声器中的每个元件由两个具有不同横截面的耦合管组成，因此与具有均匀横截面的情况相比，可以在更多频率上衰减噪声。模拟结果表明，应用在7个不同频率下设计的消声器组合后，在100至500Hz之间可获得8.8dB的总插入损耗，并且对于安装了所提出消声器的正常入射交通噪声，交错式窗户的插入损耗在100至2000Hz之间从6.7dB增加到15.6dBA。该设计通过1:4缩小比例模型的实验得到了验证。
