Rudimentary researches on nonlinear properties of microperforated-panel

According to Prof. Maa Dah you's equation of nonlinear acoustic resistance of microperforated panel(MPP) absorber, some critical condtion equations of nonlinear acoustic resistance are proposed in this paper. Additionally, these critical conditional equations are applied to computer aided design (CAD) on MPP under higher sound intensity. Though experiments of MPP, on which the diameter of perforations is less than 0.3 mm,the rudimentary researches of nonlinear properties of MPP are made also. And then, the practicability of CAD on MPP under higher sound intensity is proved experimentally.