本文应用微穿孔板吸声体理论,结合卷曲空间迷宫型结构,设计了一种满足宽频带降噪的微穿孔板迷宫结构消声器,并仿真分析了不同结构参数对消声器传递损失的影响。研究结果表明,消声器传递损失随着迷宫半径的增加而增加,而迷宫单胞面积比...本文应用微穿孔板吸声体理论,结合卷曲空间迷宫型结构,设计了一种满足宽频带降噪的微穿孔板迷宫结构消声器,并仿真分析了不同结构参数对消声器传递损失的影响。研究结果表明,消声器传递损失随着迷宫半径的增加而增加,而迷宫单胞面积比和层数对消声器的传递损失无明显影响;消声器低频传递损失随着微穿孔隔板孔径和穿孔率增大而下降,高频变化不大,但背腔深度增加其随之增加,传递损失共振频率由高频向低频移动。最后优化设计的消声器在200~6000 Hz的传递损失平均达到20 dB左右,且在200 Hz~2000 Hz频段消声效果尤为明显,最高可达57dB。In this article, based on the theory of microperforated plate sound absorber and the labyrinth structure within curling space, a microperforated plate labyrinth structure muffler is designed to meet the wide range noise reduction, and the influence of different structural parameters on the transmission loss of the muffler is simulated and analyzed. The results show that the muffler transfer loss increases with the increase of the maze radius, but the area ratio of single cell and the number of layers of the maze have no significant effect on the muffler transfer loss. The muffler’s low frequency transmission loss decreases with the increase of the aperture and perforation rate of the micro-perforated partition. The high frequency transmission loss changes slightly, but rises with the increase of the back cavity depth. The resonance frequency of transmission loss moves from high frequency to low frequency. The average transmission loss of the final optimized muffler is about 20 dB in the range of 200~6000 Hz, and the muffler effect is specifically significant in the frequency range of 200 Hz~2000 Hz, up to 57 dB.展开更多
文摘本文应用微穿孔板吸声体理论,结合卷曲空间迷宫型结构,设计了一种满足宽频带降噪的微穿孔板迷宫结构消声器,并仿真分析了不同结构参数对消声器传递损失的影响。研究结果表明,消声器传递损失随着迷宫半径的增加而增加,而迷宫单胞面积比和层数对消声器的传递损失无明显影响;消声器低频传递损失随着微穿孔隔板孔径和穿孔率增大而下降,高频变化不大,但背腔深度增加其随之增加,传递损失共振频率由高频向低频移动。最后优化设计的消声器在200~6000 Hz的传递损失平均达到20 dB左右,且在200 Hz~2000 Hz频段消声效果尤为明显,最高可达57dB。In this article, based on the theory of microperforated plate sound absorber and the labyrinth structure within curling space, a microperforated plate labyrinth structure muffler is designed to meet the wide range noise reduction, and the influence of different structural parameters on the transmission loss of the muffler is simulated and analyzed. The results show that the muffler transfer loss increases with the increase of the maze radius, but the area ratio of single cell and the number of layers of the maze have no significant effect on the muffler transfer loss. The muffler’s low frequency transmission loss decreases with the increase of the aperture and perforation rate of the micro-perforated partition. The high frequency transmission loss changes slightly, but rises with the increase of the back cavity depth. The resonance frequency of transmission loss moves from high frequency to low frequency. The average transmission loss of the final optimized muffler is about 20 dB in the range of 200~6000 Hz, and the muffler effect is specifically significant in the frequency range of 200 Hz~2000 Hz, up to 57 dB.
