基于轿车动力总成NVH性能研究

CAR-BASED POWER TRAIN NVH PERFORMANCE STUDY

轿车动力总成NVH即噪声(Noise)、振动(Vibration)和声振粗糙度(Harshness)是一个系统性的问题,涉及车辆多个系统的相互作用。本文就动力总成与悬架等子系统存在振动耦合,建立动力总成和底盘的耦合振动模型。在MATLAB/simlink下仿真表明,动力总成悬置系统NVH性能主要集中在竖直和绕曲轴转动这两个方向上,对乘员的舒适性有较大影响。用能量解耦法对动力总成悬置系统进行改进,可提高动力总成NVH性能及乘坐的舒适性。

NVH Power train is a combination of systemic issue which includes car noise, vibration and harmonic vibration roughness. It involves interaction of multiple systems of vehicles. We focus on setting up power train and classic vibration model based on the existence of vibration of power train and suspension subsystems. Under the simulation of MATLAB/simlink, NVH power train mounting system performance mainly concentrates on the both directions of vertical and rotate crankshaft, which greatly affect riding quality of crew. The power train mounting system and the performance of NVH power train can be improved by the energy decoupling theory.