增压管路系统辐射噪声特性及优化控制

Radiated Noise Research and Optimization of Turbocharged Air Duct System

涡轮增压器产生高频气流噪声成分,严重影响车内驾乘舒适性.增压器噪声的控制技术与解决方案,已成为汽车工程应用领域研究的重点之一.本文主要针对涡轮增压器的Hiss噪声、BPF噪声进行研究,首先,从涡轮增压系统结构与工作原理进行阐述分析,论述其噪声的产生机理与主要特征.其次,提出消声器的模块化开发理念,并针对实际工程案例设计了四腔体模块化消声器,测试获得并分析传递损失消声性能.最后,将消声器安装于增压管路系统,通过整车道路试验验证其实际消声性能.结果表明,所设计的消声器结构有效抑制了涡轮增压器的噪声水平,显著改善了整车NVH水平,为工程开发应用提供有效的设计指导.

The turbocharger radiates the air-induced high frequency noise,which affects the riding comfort and the sound quality inside the vehicle.The controlling technique and solution of the turbocharger aerodynamic noise is being the focus point in the field of automobile engineering.In this paper,we proposed the investigation focused on the turbocharger noise,e.g.Hiss noise and BPF noise.First,the system structure and working principle of the turbocharger was analyzed,the noise mechanism and characteristic was researched and proposed accordingly.Then,the modular concept of muffler design was proposed and a four-chamber muffler was developed,as well as the transmission loss analysis through bench measurement.Finally,the vehicle road test was finished with the modular muffler attached to the charged air duct.In result,the actual acoustic performance of the muffler was evaluated and validated,which proves helpful enough for the turbocharger noise attenuation.Such development and solution improves the vehicle NVH performance and could provide effective design guidance for engineering application.