Abstract：In order to reduce the tire-road noise, this study optimized the band structure of the three cavity forms based on the U-shaped model. A "broadband and multi-band" hourglass sonic crystal was designed, then a new type of noise barrier was established and tested for noise reduction performance. The results showed that for the noise characteristic frequency band coverage, hourglass>taper in>straight, and the band gap range can be effectively adjusted by changing the cavity size. For the noise reduction performance of sonic crystal noise barrier, Bragg scattering and cavity resonance effect were coupled and the number of rows can be increased to improve the noise reduction effect in the band gap by 0.9~3.5dB(A). As a discontinuous periodic structure, the noise reduction effect after the barrier was unevenly distributed, especially between the scatters, therefore, when measuring, the number of measuring points should be increased and the influence of the interval should be considered. Compared with the traditional noise barrier and the Bragg-type sonic crystal noise barrier, the noise reduction effect of hourglass type was improved by 0.9~14dB(A) in the 500~1000Hz target frequency band gap.
秦晓春, 倪安辰, 陈正昊, 马保龙, 孟范彤. 包含共振机理的声子晶体声屏障设计与降噪性能测试[J]. 中国环境科学, 2022, 42(1): 474-482.
QIN Xiao-chun, NI An-chen, CHEN Zheng-hao, MA Bao-long, MENG Fan-tong. Design and experimental research of sonic crystal noise barrier with resonance mechanism. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 474-482.
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