微穿孔板简化仿真方法在双层微穿孔结构中的应用

为解决微穿孔板消声结构声学仿真计算过程中，微孔给有限元网格划分带来的困难，采用两种不同的简化方法模拟微穿孔板.其一将经典微穿孔板吸声结构理论与传递导纳法相结合，通过在穿孔板内外表面定义一组传递导纳系数表示微穿孔板；其二则计及板材料性能对吸声特性的影响，将微穿孔板转化为等价的多孔材料模型.分别运用这两种微穿孔板简化仿真方法对某高频双层串联微穿孔板消声器的传声损失进行仿真计算，并与阻抗管实验测试结果进行对比.结果表明，两种微穿孔板简化仿真方法均适用于双层微穿孔结构，且能准确有效地预测其声学性能. 

A Simplified Simulation Method for Micro-Perforated Panel with Double Layer Micro-Perforated Structure

In order to overcome the difficulty caused by micro-punches in finite element meshing for simulating a micro-perforated panel silencer, two different simplified methods were adopted to simulate micro-perforation panel. In the first method, combining the classical micro-perforated panel absorber theory with transfer admittance method and defining a set of transfer admittance coefficients on its inner and outer surfaces, the simulation was simplified for micro-perforated panel. In other method, considering the effect of panel properties on sound absorption capability,the micro-perforated panel was transformed into an equivalent porous material model. Based on above two simplified simulation methods, the transmission loss of a double layer micro-perforated panel muffler with high frequency was calculated, and the results were compared with the impedance tube measurements. Results show that, the two simulation methods can predict acoustic performance of double layer micro-perforated structure efficiently, and are helpful in engineering application.