Analysis of Acoustic Impedance of Duct Wall Based on Finite Element and Adaptive Evolutionary Algorithm

For acoustic model of the finite length duct, in order to make the duct noise achieve the maximum attenuation in a wide frequency band, the acoustic finite element method and the adaptive evolutionary algorithm are used to optimize the impedance parameters of the acoustic liner of duct. The numerical simulations of the optimal values of the acoustic impedance and the acoustic impedance of the acoustic liner under the rectangular cross-section duct is studied. The influence of the grazing flow, the length of the acoustic liner and the laying way on the optimal acoustic impedance and the transmission loss of duct are discussed, which provides a theoretical basis for the realization of hybrid active/passive sound absorption.