Alberich型吸声覆盖层的低频吸声机理分析

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (1) : 56-60.

论文

Alberich型吸声覆盖层的低频吸声机理分析

陶猛1;汤渭霖2

作者信息 +

Mechanism Analysis of Sound Absorptionof Alberich Coating at Low-frequency

Tao Meng1; Tang Weilin2

Author information +

文章历史 +

摘要

声波垂直入射Alberich型吸声覆盖层时激起沿厚度方向传播的轴对称波，而决定覆盖层低频性能的最低阶波可等效为“准平面波”，通过共振特性分析了覆盖层的低频吸声机理，指出达到低频有效吸声需要满足的轴对称波相速度的近似条件。低频吸声机理要点包括：（1）吸声覆盖层的共振是粘弹性圆柱腔体的共振；（2）吸声覆盖层的吸声峰值频率对应覆盖层的反共振频率而不是共振频率；（3）绝对软背衬的最低吸声峰频率比绝对硬背衬低一半左右。

Abstract

The axisymmetric wave propagating along the thickness direction of Alberich sound absorption coating is excited in the case of normal incidence, and the axisymmetric wave with the lowest order which determines the low-frequency performance of sound absorption can be approximated as a quasi plane wave. The mechanism of sound absorption of Alberich coating is analyzed by using the resonance theory, and the relationship between the phase velocity of axisymmetric wave and the lowest peak frequency of absorption coefficient is obtained. The mechanisms of sound absorption at low-frequency include that: (1) the coating resonance is referred to the resonance of viscoelastic cylindrical tube; (2) the peak frequency of absorption coefficient is corresponding to the anti-resonant frequency, rather than resonant frequency of coating; (3) the lowest peak frequency of absorption coefficient in the case of soft backing is half of that in the case of rigid backing.

导出引用

陶猛;汤渭霖. Alberich型吸声覆盖层的低频吸声机理分析[J]. 振动与冲击, 2011, 30(1): 56-60

Tao Meng;Tang Weilin. Mechanism Analysis of Sound Absorptionof Alberich Coating at Low-frequency[J]. Journal of Vibration and Shock, 2011, 30(1): 56-60