耦合声阻抗在扩散吸声体设计中的应用研究

为解决小房间的音质设计问题,需要设计不同的扩散吸声体。利用共振吸声的边缘效应,通过不同共振频率的共振器耦合共振时的非线性声阻抗变化组合,形成既能高效吸声,又能均匀散射的声学界面。数值分析及实验结果表明,新型的扩散吸声体内部没有任何传统吸声材料的情况下,单位面积吸声量在中低频段可达1.3 m2,在高频段由于非线性声阻抗与共振器的辐射阻抗不匹配影响,相应吸声量降低到0.7 m2左右。耦合声阻抗的运用使得新型扩散吸声体吸声的效率高,频带宽,免去传统吸声材料的使用,在小房间的声学应用中具有突出的优势。

Application of coupling impedance in diffsorber design

To solve the acoustic problem of small rooms, designing different diffsorbers is essential. Using edge effect of resonance absorption and changes of nonlinear impedance among different resonators, a new type of diffsorber was designed. Numerical analysis and experimental results show that the new diffsorber has special acoustical performance for its combined ability to absorb sound energy effectively and scattering them uniformly at the same surface and at the same time. For the new diffsorber, although there are no classical sound absorbing materials inside, the equivalent absorption area may reach 1.3m2 in the mid-low frequencies and 0.7m2 at the high frequencies. Coupling impedance makes the new type of diffsorber to be a high efficiency, broad bandwidth absorber, and also a good diffuser, therefore this kind of diffsorber has outstanding advantages in small room acoustics design.