高强度声场中微穿孔板的非线性声阻抗率

Nonlinear Specific Acoustic Impedance of the Microperforated Panel under Sound Field of High Intensity

本文对微穿孔板的非线性声阻抗率作理论与实验两方面的研究。对穿孔板附近的流体运动,从空气动力学基本方程出发进行严格分析,导出了一阶近似的理论解。对非线性声阻和声抗的根源作了探讨。所得一些计算公式包括了线性效应的影响。实验测量采用了双传声器法。理论计算结果表明与实验所得数值良好一致。

In this paper, the nonlinear acoustic impedance of the micro-perforated panel is investigated both theoretically and experimentally. The flow motion in the vicinity of panel is analysed on the basis of fundamental equations in aerodynamics. The lst approach of the theoretical solution is derived. The origins of the nonlinear resistance and reactance are discussed. Taking into account the linear effect, formulas for calculation are obtained. Experimental measurement is undertaken with two-micro-phone method. It is shown that the results of calculation are in good agreement with the experimental values.