工况传递路径分析在方向盘振源识别中的应用

摘 要：针对某三缸发动机车辆怠速工况下方向盘抖动的问题，利用工况传递路径分析方法找出方向盘抖动的原因。首先采集怠速工况的动力总成悬置点和方向盘的振动加速度信号，使用奇异值分解建立了从动力总成悬置被动端到方向盘的振动传递矩阵。然后对比传递矩阵合成的振动信号与拾振点的实测信号，验证了传递矩阵的正确性。最后计算各条路径对方向盘的振动能量贡献量，结合模态分析和信号的频谱分析，发现导致方向盘抖动的主要原因是副车架的共振，为解决方向盘抖动问题提供了依据。

Experimental Study on Identification Method of Inertia Parameter of Powertrain Rigid Body

The accurate inertia parameters of powertrain rigid body is one of important prerequisites in the powertrain mounting system design. Based on the existing methodology ,a methodology of inertia parameter identification of the non-linear damping mounting system is introduced and validated.In this methodology,three mounts of the powertrain are used as mounting,and the inertia parameters of powertrain rigid body is gained by Frequency Response Function (FRF)。Based on the methodology,the influences of vehicle mounting system to the inertia parameters of powertrain rigid body is taken into account adequately.The feasibility and reliability of the methodology is proved by an instance.