一种进气消声器设计及其在拖拉机中的应用

某型号拖拉机的发动机进气系统噪声过大,严重影响驾驶员身心健康,需对其进行降噪设计。首先,基于试验测试,分析进气噪声特征。其次,基于直通穿孔管消声理论,将直通穿孔管结构看做一种共振消声单元,提出并设计一种针对宽频带噪声的多腔共振型消声器结构。同时,采用声学有限元软件Virtual.Lab对该消声器声学性能进行仿真研究。最后,将该消声器加装在实车上进行试验验证。结果表明,数值模拟结果与试验结果能较好吻合,所设计的消声器能明显降低发动机进气噪声,消声量达到15 d B(A),优于国标要求。

Design of a Broadband Intake Muffler andIts Application in Tractors

The noise in the engine intake system of the tractor is excessive, which is seriously affect the physical and mental health of driver. So it is necessary to make the noise reduction design. Firstly, the intake noise characteristics is analysed based on experimental testing. Secondly, based on the theory of straight-through perforated tube, the perforated tube is seen as a resonant silencing unit. A multi-cavity resonance-type structure is proposed in this paper which is aimed at broadband noise. And meanwhile, the Virtual. Lab software is used to simulate the acoustic performance of the muffler. Finally, the muffler is assembled into the tractor to verify the effectiveness of the proposed structure. The result shows that the numerical simulation results are well fitted with the experimental results. The designed muffler can effectively reduce the intake system noise and the amount of noise elimination can achieve 15dB(A), which is superior to the requirement of the National Standard.