吸声材料厚度及流阻对亥姆霍兹共振器吸声性能的影响

为了研究吸声材料对亥姆霍兹共振器吸声性能的影响，基于有限元方法，运用COMSOL Multiphysics软件建立了内置吸声材料的亥姆霍兹共振器的有限元模型。仿真计算了吸声材料的厚度和流阻变化对亥姆霍兹共振器吸声性能的影响。研究发现，当材料流阻不变时，随着吸声材料厚度的增加，传递损失逐渐减小，共振频率向低频方向移动；当材料厚度不变时，随着流阻的增加，共振频率先减小后增加；当流阻增加到无穷大时，吸声材料就可以看成刚性壁，导致共振腔体积减小，形成新的共振峰。

The effects of the thickness and flow resistance of sound absorption material on the sound absorption performance of helmholtz resonator

Based on the finite element method and COMSOL Multiphysics, the finite element model of the helmholtz resonator with absorption material is established. The effects of the thickness and flow resistance of sound absorption material on the sound absorption performance of helmholtz resonator are studied. Simulation results show that the resonance frequency moves toward low frequency region and transmission loss decreases gradually with the increasing of the thickness when the flow resistance of sound absorption material is not changed. With the increase of the flow resistance of sound absorption material, resonance frequency decrease firstly and then increase when the thickness of sound absorption material keep unchanged. The sound absorption material can be viewed as a rigid wall when the flow resistance increased to infinity. The results lead to that the resonant cavity will be decreased and the new resonant peak will be formed.