多孔纤维吸声材料填充蜂窝结构的声学性能

本文理论研究了多孔纤维吸声材料填充矩形蜂窝结构的声学特性.假设周期蜂窝结构将多孔纤维吸声材料划分为独立周期子空间,理论建模中选取单个蜂窝胞元进行分析.蜂窝结构内部的多孔纤维吸声材料采用等效流体模型进行模拟,斜入射的声波在各个子空间呈驻波分布,由声场的声压和速度可积分得到通过蜂窝结构入射平面和透射平面的能量流,从而得到多孔纤维吸声材料填充蜂窝结构的吸声及传声损失性能.与单一多孔纤维材料声学性能的对比发现,多孔纤维吸声材料填充蜂窝结构的吸声性能得到了有效提高.基于理论模型,进一步分析了结构参数对多孔纤维吸声材料填充蜂窝结构吸声/传声损失性能的影响.

Acoustical properties of honeycomb structures filled with fibrous absorptive materials

The acoustical properties of the honeycomb structures filled with fibrous absorptive materials are theoretically investigated in the present paper. Since the fibrous materials are divided into periodical spaces, the model is developed based on a unit cell of the whole structure. The fibrous material in the honeycomb structure is modeled by applying the equivalent fluid theory with the obliquely incident sound existing on the periodical spaces in the form of standing wave. The energy flux is then obtained by the pressure and velocity at the fluid-structure interface, upon which the sound absorption coefficient and transmission loss is favorably calculated. The effects of the structure parameters on the acoustical properties are also discussed in the present paper. Results show that the hybrid structure has a better sound absorption ability than only fibrous material.