双开口谐振环结构的通风隔声性能研究

Research on Ventilation and Sound Insulation Performance of Double Slit Resonant Ring Structures

设计一种基于双开口谐振环结构的新型声屏障,采用有限元法进行分析计算,获得该模型的隔声量曲线图,计算结果表明,该结构有两个隔声峰值,通过对峰值处的声压、声压级以及声速图的分析,揭示这一现象的本质特征,研究发现所提出结构的性能是由于亥姆霍兹谐振器与法布里-珀罗谐振管共同作用而导致的,并通过实验进行对比验证。同时采用有限元法模拟研究结构参数对隔声峰值的影响,结果表明通过改变两开口圆环间的夹角以及开口宽度大小等结构参数可以调整隔声峰值。该结构的声屏障在中低频段内具有良好的通风降噪性能,可为城市交通噪声的研究提供有效方法,具有潜在的应用价值。

A new type of sound barriers based on a double-slit resonant ring structure is designed.The finite element method is used to analyze and calculate the sound insulation curve of the model of the new barrier.The calculation results show that the structure has two sound insulation peaks.Analysis of the sound pressure,sound pressure level,and sound ve-locity diagram at the peaks reveals the essential characteristics of this phenomenon.It is found that the property of the pro-posed structure comes from the joint action of the Helmholtz resonator and the Fabry-Perot resonator tube,and it is verified by comparison through experiments.At the same time,the finite element method is used to simulate and study the influence of structural parameters on the peak value of sound insulation.The results show that the peak value of sound insulation can be adjusted by changing the structural parameters such as the angle between the two opening rings and the width of the open-ing.The sound barrier based on this structure has good ventilation and noise reduction performance in the middle and low frequency bands.This work provides an effective method for the study of urban traffic noise and has potential application value.