增程式轻卡排气消声器声学性能分析与优化设计

Acoustic Performance Analysis and Optimization Design of Range-Extender Light Truck Exhaust Mufflers

针对某增程式轻卡排气口噪声高的问题,通过实车测试及分析,确认主要为中低频噪声贡献。采用数值计算方法对排气消声器进行声学分析及空气动力学分析,在确保排气系统压力损失满足设计要求的前提下,对消声器内部结构进行优化设计。实车验证结果表明:消声器优化后,整车定置增程器充电工况下排气口噪声总声压级降低了3.0dB(A),加速工况下问题转速点处排气口噪声声压级显著降低,排气口噪声大的问题明显改善。

Aiming at the problem of high noise at the exhaust port of an incremental light truck, through real vehicle test and analysis, it is confirmed that it mainly contributes to medium and low frequency noise. The numerical calculation method is used for acoustic analysis and aerodynamic analysis of the exhaust muffler. On the premise of ensuring that the pressure loss of the exhaust system meets the design requirements, the internal structure of the muffler is optimized. The real vehicle test results show that after the muffler is optimized, the exhaust port total sound pressure level is reduced by 3.0 dB(A) when the extender is charging, the sound pressure level of exhaust noise at the problem speed point is significantly reduced under acceleration condition, the problem of exhaust port noise has been improved significantly.