In order to improve the suppression range of the low frequency noise of the piezoelectric acoustic liners

the structure of the acoustic liner was optimized. By using the plane wave theory

the acoustic physical model of two kinds of curvilinear channels was constructed

and the transfer matrix of two models was established

which can be used as the theoretical basis for loss calculation of the Helmholtz resonator of the heteromorphic cavity; and the correctness was verified by simulation. Combining the deformation of the piezoelectric oscillator with the finite element simulation analysis of the acoustic liner

the results showed that under the condition of applying 500V driving voltage to the piezoelectric oscillator

the two kinds of acoustic systems were offset by 115Hz and 120Hz

respectively. Compared with cylindrical cavity acoustic liner

the results show that: within the same cavity thickness range

for the cavity generated by the curve of greater curvature under the condition of the same driving voltage

the frequency variation is higher

thus providing an effective basis for the acoustic liner cavity structure optimization.