隔膜抽气泵用复合微穿孔管消声器优化设计

针对某隔膜抽气泵的排气噪声频谱特性，提出了一种高效宽频的串并联复合微穿孔管消声器。推导了复合微穿孔管消声器传递损失的数值计算模型，并基于此模型利用Isight软件集成Actran和Matlab软件，采用多种群遗传算法对复合微穿孔管消声器的平均传递损失进行优化，来扩宽消声频带提高消声性能。对优化的消声器进行试验测试，结果表明，采用优化后的串并联复合微穿孔管消声器，其隔膜抽气泵排气噪声在全频段内都有明显下降，总声压级下降10 dB（A），在最关心的1 000～5 000 Hz频段内，消声量最高达到了22 dB（A）。试验研究证明，所提出的复合微穿孔管消声器及其优化设计程序为控制宽频带噪声提供了一种高效可行的方法。

Optimization design of composite microperforated tube muffler for diaphragm air pump

According to the spectrum characteristics of exhaust noise of a diaphragm pump, an efficient broadband series-parallel composite microperforated tube muffler is proposed. A numerical model for the transmission loss of composite microperforated tube muffler is derived. Based on this model, the average transmission loss of composite microperforated tube muffler is optimized by using Isight software integrated with Actran and Matlab software, and a variety of group genetic algorithms are used to widen the frequency band of muffling and improve the performance of muffling. The test results of the optimized muffler show that the exhaust noise of the diaphragm pump decreases obviously in the whole frequency band, the total sound pressure level is decreased by 10 dB(A), and the maximum noise reduction is 22 dB(A) in the most concerned frequency band of 1 000~5 000 Hz. The experimental results show that the composite microperforated tube muffler and its optimal design program provide an efficient and feasible method for broadband noise control.