关键词: 微穿孔板, 声学超材料, 通风噪声, 仿真

Abstract: By comparing the sound absorption coefficients of microperforated panels under different back cavity depths through simulation and test of microperforated panels under different back cavity depths, the accuracy of the transfer admittance matrix in defining their acoustic characteristics was verified. An acoustic metamaterial sound absorption unit composed of a microperforated panel and a Maze-Type structure was designed. Through simulations and experiments, the regulatory role of microperforated panel characteristics on the sound absorption peak, frequency, and bandwidth was clarified. Based on the above conclusions, a noise reduction module targeting the ventilation noise of ducted air conditioners was developed. Test results show that under the same air volume, the noise reduction amount at each fan speed level is approximately 4 dB, and the maximum single-frequency noise reduction amount reaches 16.7 dB. The noise reduction effect is significant, providing a technical reference for ventilation noise control.

Key words: Microperforated Panel, Acoustic Metamaterial, Ventilation Noise, Simulation