亥姆霍兹共振腔不同连接方式的传递损失与特性分析

Transmission loss and characteristic analysis of double Helmholtz resonators with different connection modes

为了研究亥姆霍兹共振腔不同连接方式的共振频率和传递损失,运用Virtual.Lab Acoustics软件建立单个和两个亥姆霍兹共振腔的有限元模型。仿真计算在串联或并联情况下两个亥姆霍兹共振腔当腔体体积相同和体积不同时的传递损失,并进行吸声特性分析。研究发现,两个体积相同的亥姆霍兹共振腔并联时共振频率略微增大,吸声性能则显著提高;当两个体积不同的亥姆霍兹共振腔并联时共振频率为各自腔体共振频率,互不影响;当两个亥姆霍兹共振腔串联时,振动规律符合二自由度弹簧-质量振动系统的振动规律。把亥姆霍兹共振腔并联关系推广到穿孔板,建立穿孔板孔和背腔的有限元模型和实体模型并进行实体模型的阻抗管试验,对穿孔板仿真结果与实验结果进行对比,验证了仿真模型的正确性。

In order to study the resonance frequency and transmission loss of the double Helmholtz resonators with different connection modes,the finite element model of single and double Helmholtz resonators is established by using Virtual. Lab Acoustics software. The characteristics of transmission losses of double Helmholtz resonators in series or parallel cases are calculated. Simulation results show that the resonance frequency of the double Helmholtz resonator with same volumes is slightly increased and sound absorption performance is improved significantly. When double Helmholtz resonators with different volumes,the resonance frequency is the resonance frequency of resonant cavity,and does not affect each other. When two Helmholtz resonators are connected in series,it conforms to the law of vibration of two degree of freedom spring mass vibration system,according to Helmholtz parallel relationship and extending to the perforated panel,the actual model of perforated panel was established. With the standing wave tube test of the actual model,through comparison with simulation of perforated panel,the correctness of the perforated panel model is verified.