摘要
本文介绍一种在穿孔板表面再覆盖一层薄膜的吸声结构，着重对这种加膜穿孔板的声学性能作严格的理论分析．从基本的声学理论出发，导出了反映加膜穿孔板声传递特性的普遍关系式，获得了加膜穿孔板声阻抗率的计算公式．文中讨论了声阻率随频率，空气层厚度以及薄膜面密度等重要参量变化的规律．理论计算结果与实验数据良好相符．所得结论为这种新型吸声结构的优化设计提供了严格的理论基础．
In this paper, the acoustical characteristic of perforated panel with cover membrane is theorectically investigated. Based on the fundametal principle of acoustics, the expressions of reflecting the sound transmisson of this construction are derived and the formulas of calculating the specific acoustic impedance are obtained. We also discuss the changesof specific acoustic resistance with some important 'parameters, such as the frequency, the thickness of air layer and the surface density of the membrane. A good agreement betweenpredicted results and measured data is illustracted
出处
《声学学报》
EI
CSCD
北大核心
1994年第1期45-52,共8页
Acta Acustica
关键词
吸声体
穿孔板
声性质
吸声构造
Acoustic impedance
Acoustic waves
Calculations
Mathematical techniques
Perforating
Structural panels
