汽车涡轮增压器轻度喘振分析及路径控制优化

Light Surge Analysis and Path Control Optimization for Turbocharger

以某车型涡轮增压器为研究对象,通过道路试验及频谱分析对车辆加速过程中的“嘶嘶”声进行识别,结果表明噪声频段为700~1600Hz,确认涡轮增压器发生轻度喘振。继而通过路径控制优化的方式解决轻度喘振问题,设计了相应的宽频消声器且对消声器的消声性能进行仿真计算,结果显示消声器在700~1600Hz频段的传递损失都在10dB以上。最后进行实车测试,安装宽频消声器后,车内“嘶嘶”声明显改善,提高了整车NVH性能。

The turbocharger of a certain type of vehicle was taken as the research object. Road test and spectrum analysis were carried out to identify the "hiss" sound in the vehicle acceleration process. The results show that the noise frequency range is 700~1 600 Hz, which confirms that the turbocharger has a slight surge. Then the path control optimization method was used to solve the mild surge problem. The corresponding broadband muffler was designed and the muffler performance of the muffler was simulated. The results show that the muffler has a transmission loss of more than 10 dB in the 700~1 600 Hz band. Finally, a real car test was carried out. After installing a broadband muffler, the "hiss" sound in the car is significantly decreased, and the NVH performance of the whole car is improved.