School of Civil Resources Engineering,University of Science Technology Beijing
为减少矿用轴流风机的中低频噪声,设计了一种局域共振型声子晶体双层板,并提出了一种隔声板隔声性能评价方法,基于该评价方法,利用数值模拟软件COMSOL对声子晶体双层板进行了结构参数优选。结果表明：声子晶体单板的带隙宽度随着包覆层厚度的增加而降低,而随着振子半径的增加而增加；在特定频段内,设计的声子晶体双层板隔声性能优于声子晶体单板。声子晶体双层板对轴流风机的目标降噪频段(200 Hz~800 Hz)的传声损失(STL)比声子晶体单板高10 dB,对其噪声峰值频率(500 Hz)处的STL达到最大值58 dB,且不存在明显的隔声低谷频段,具有良好的隔声效果。
In order to reduce the medium and low frequency noise of mine axial flow fan, a kind of local resonance phononic crystal double-layer plate was designed, and a sound insulation performance evaluation method was proposed. Based on the evaluation method, the structure parameters of the phononic crystal double-layer plate were optimized by COMSOL Multiphysics software. The results show that the band gap width of phonon crystal veneer decreases with the increase of coating thickness, but increases with the increase of oscillator radius. In the specific frequency band, the sound insulation performance of the designed phononic crystal double layer plate is better than that of the phononic crystal single plate. The sound transmission loss of the phononic crystal double-layer board is 10 dB higher than that of the phononic crystal board in the target noise reduction frequency band (200 Hz~800 Hz) of the axial flow fan, and the STL at the peak noise frequency (500 Hz) reaches the maximum value of 58 dB, and there is no obvious low frequency band of sound insulation, which has a good sound insulation effect.