亥姆霍兹共振消声器的优化设计

亥姆霍兹消声器能够有效地抑制特定频率的低频噪声。设计了一种亥姆霍兹消声器,可以对频率在145 Hz处的噪声进行降噪处理。但是所设计的消声器的消声带宽较窄,因此需要在保证消声器共振频率不发生改变的情况下,将亥姆霍兹消声器的消声频带增大。使用遗传算法对亥姆霍兹消声器的结构参数进行优化,将优化后的结构进行仿真模拟。仿真结果表明消声器的消声带宽从32 Hz拓宽到了86 Hz。之后进行了实验验证,实验结果显示消声带宽从55 Hz增大到105 Hz,消声频带扩宽了91%,证明了优化结果的可行性,并且实现了宽频带的消声,为消声器的设计优化提供了参考。

Optimization design of Helmholtz resonance muffler

Helmholtz muffler can effectively suppress low-frequency noise in a specific frequency range. In this paper, a Helm-holtz muffler is designed, which can reduce the noise at 145 Hz. However, the muffler has narrow muffling band-width, which needs to be increased under the condition of keeping the same resonant frequency. The genetic algo-rithm is chosen to deal with Helmholtz muffler, and the structure parameters of the muffler are optimized. The sim-ulation of the optimized structure is carried out, and the results show that the muffling bandwidth is broadened from 32 Hz to 86 Hz. However, the experimental results show that the muffling bandwidth of the optimized muffler increases from 55 Hz to 105 Hz, i.e. broadened by 91%. This proves the feasibility of the optimized results, which achieves broadband muffling, and provides a reference for the optimization design of mufflers.