摘要
针对某车型排气尾管低频噪声大问题,利用GT-Power软件建立发动机工作过程与排气消声器耦合仿真分析模型,对排气消声器声学性能和空气动力学性能进行数值计算,分析排气尾管低频噪声大的原因。依据分析结果提出消声器结构优化方案,制作优化样件进行整车排气尾管噪声试验。试验结果表明,低转速时消声器插入损失提高5d B~7 d B(A),2阶次噪声整体降低,低频噪声问题明显改善。
Model for engine working process and exhaust muffler coupling simulation of a car is established with GTPOWER software and the acoustic characteristics and aerodynamics performance of the exhaust muffler are computed. The reason of large low-frequency noise of the exhaust tailpipe is found. Muffler structure optimization strategy is proposed based on the simulation results. Then, the full vehicle exhaust tailpipe noise test is conducted to validate the proposal. Test results show that, at low rotary speed, the muffler insertion loss is increased by 5 d B(A)-7 d B(A) after the optimization, the overall second order noise is reduced, and the low frequency noise is reduced significantly.
引文
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