Calculation and experiment of sound absorption by pseudostochastic diffusors

Based on theory proposed on the preceding paper3,the calculation and experiment of sound absorption by pseudostochastic diffusors are carried out.Average specific acoustic impedance of the whole structure is obtained by calculating sound pressure and particle velocity in the diffllsor plane.The nonlinear coupling specific acoustic resistance is emphatically analyzed.The experiments of measuring normal sound absorption coefficient of the structure in standard wave tube are made.The tested results are agreement with predicted data.