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Modern Physics 2024
基于亥姆霍兹共振与空间盘绕的组合型隔音通风超结构的设计及优化
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Abstract:
噪声污染问题在当今社会已日益严重。为了满足人们对居住环境既可隔音又能通风的需求，现提出一种新型可通风的隔音降噪声学超结构。该结构同时考虑了亥姆霍兹共振与空间盘绕两种隔声机理。通过实验和数值仿真计算，在保持25%高通风率的同时，最大声音传输损耗在峰值处可达20 dB。600~1000 Hz中低频率范围出现了宽带，传输损耗值为8~10 dB；在1000 Hz以上的频率范围出现了一个较为平缓的曲线，全都保持着12 dB以上的传输损耗。为了获得更好的隔音效果，详细讨论了各几何参数对声音传输损耗的影响。最后，通过遗传算法对该结构几何参数进行优化，实现了更佳的宽带低频隔音效果。该结构将在声学工程领域中表现出巨大的应用潜力。
The problem of noise pollution has become increasingly serious in today’s society. In order to meet people’s demand for both sound insulation and ventilation, a new type of ventilation sound insulation and noise reduction acoustic metastructure is proposed based on Helmholtz resonance and coiling-up space simultaneously. Both numerical analyses and experiments are implemented to obtain the sound transmission loss of this metastructure, and the two results are in good agreement. A maximum sound transmission loss up to 20 dB will be obtained, with a high ventilation rate of 25%. A broad-band sound insulation in mid-low frequency range (600~1000 Hz) is achieved, with sound transmission loss of 8~10 dB; and a relatively plat curve appears over 1000 Hz, with sound transmission loss of more than 12 dB. The effects of several geometric parameters on the sound transmission loss are discussed in detail. Finally, the structural geometry parameters are optimized by the genetic algorithm to achieve a better broadband low-frequency sound insulation. The metastructure will show great potential applications in the field of sound insulation.
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