In order to improve the sound absorption of thickness conventional microperforated panel, cylindrical holes are substituted with tapered holes, and the tapered hole microperforated panel structure is proposed. To determine the structure of the tapered hole microperforated panel, the particle swarm optimization algorithm is used, and single-parameter optimization and two-parameter optimization are performed. Numerical results show that: the maximum absorption coefficient of the tapered hole microperforated panel with single-parameter optimization increase significantly than such coefficient of the thickness conventional microperforated panel; compared with thickness conventional microperforated panel, the structure with two-parameter optimization not only increase the maximum absorption coefficient, but also can keep the original resonant frequency constantly. Results prove that particle swarm optimization algorithm provides a quick and efficient approach in designing tapered hole microperforated panel structure.

tapered hole microperforated panel; sound absorption; particle swarm optimization; structure parameters