声波在纤维性吸声材料中的传播

本文对纤维性吸声材料中声音的传播理论作了推广.文中根据纤维无规分布的假定,从微观的纤维散射过程出发,借助严格的统计力学方法,导出诸如有效密度、有效压缩模量等宏观量的理论公式。对实验研究作了简要讨论,理论结果与实验数据良好相符,不需引入任何待定的经验常数。

PROPAGATION OF ACOUSTIC WAVES IN FIBROUS SOUND ABSORBENTS

A developed theory dealing with fibrous sound absorbents is proposed. It is supposed that filaments of the material are distributed randomly. The macroscopic quantities, such as the effective density and the effective bulk modulus are derived from the microscopic scattering process of the filaments according to rigorous statistical consideration. The experimental examination is discussed briefly. It is shown that the theoretical results are in good agreement with the experimental data. No empirical constant is to be fitted.