微穿孔板吸声结构仿真计算方法研究

Study on Numerical Simulation Method for the MPP Absorber

本文提出将马氏微穿孔板理论与传递导纳法相结合,建立简化的微穿孔板吸声结构的有限元仿真计算方法。基于阻抗管法材料吸声系数测试原理建立了吸声系数仿真实验模型,对微穿孔板结构的吸声系数进行了仿真计算,并与理论计算结果做了对比,说明了该简化方法的合理可行。同时,对金属和非金属材料的微穿孔板计算时温度传导系数的影响做了比较说明。

Transfer relation admittance method combined with the micro-perforated panel(MPP)theory is proposed to simplify the modeling of the MPP absorber in the three dimensional finite element methods(FEM) simulation.Numerical simulation model for the determination of the sound absorption coefficient based on the impedance tube method is built to verify the efficiency of the proposed method.The simulated results show a good accordance with the theoretical results which confirms the feasibility of the proposed method.Meanwhile,the effects of the temperature conductivity coefficient on the performances of the MPP made of metal and nonmetal material are discussed.