声致振动对3层微穿孔板吸声体吸声性能影响

Effect of sound-induced vibration on the sound absorption properties of three-leaf microperforated panel absorbers

为了研究声致振动对3层微穿孔板吸声体的吸声性能的影响,基于微穿孔板吸声理论与声电等效电路原理,对考虑声致振动时,3层微穿孔板吸声体的吸声性能进行了计算。研究发现,考虑声致振动时,3层微穿孔板吸声体的低频吸声性能有所降低,高频吸声性能变化不大。且随着微穿孔板的质量密度的增加,考虑声致振动时的3层微穿孔板吸声体的吸声性能曲线逐渐接近未考虑声致振动的情况。当其它参数保持不变时,随着穿孔板穿孔直径和间距的增加两共振峰逐渐向低频方向移动;随着穿孔率的增加,两共振峰逐渐向高频方向移动。因此,声致振动对3层微穿孔板吸声体的吸声性能有一定的影响,其影响程度与微穿孔板的质量密度和结构参数相关。

In order to study the effect of sound-induced vibration on the sound absorption properties of three-leaf microperforated panel absorbers,sound absorption properties of three-leaf microperforated panel absorbers are computed based on the microperforated panel theory and electro-acoustical equivalent circuit principle.Results show that the low-frequency sound absorption properties of three-leaf microperforated panel absorbers decrease and high-frequency sound absorption properties of three-leaf microperforated panel absorbers change little considering sound-induced vibration.And the sound absorption performance curves of three-leaf microperforated panel absorbers considering sound-induced vibration are gradually closed to the condition without considering sound-induced vibration with the increasing of the mass density.Two resonance peaks moves toward low frequency region with the increasing of the pore diameter and distance of microperforated panel and moves toward high frequency region with the increasing of the perforation when other parameters keep invariant.In conclusion,the sound absorption performance of three-leaf microperforated panel absorbers was affected by sound-induced vibration and the variation degree of sound absorption performance depends on the mass density and structure parameters of microperforated panel.