汽车电动助力转向系统的振型分析  

Analysis of vibration modes for electric power steering system

作　　者：苗立东[1] 何仁[2] 

机构地区：[1]山东理工大学交通与车辆工程学院,山东淄博255049 [2]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2009年第4期362-365,391,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省"六大人才高峰"资助项目(E-2002-12);江苏省汽车工程重点实验室开放基金资助项目(QC200704);山东省自然科学基金资助项目(2003ZX15);山东理工大学科研基金资助项目(2006KJM32)

摘　　要：针对汽车电动助力转向系统工作过程中经常出现的振动现象,采用振动分析理论研究了由转向盘、电动机转子和输出轴3个集中质量组成的控制对象的振型,包括无阻尼系统和粘性阻尼系统的振型.并以转向轴式这种最常用的电动助力转向系统的结构参数进行分析,采用Matlab软件的符号运算工具箱推导出系统的两个固有频率.结果表明控制对象是小阻尼的,在低频共振频率范围内更是如此,由此造成了在低频共振频率附近的Bode图上出现一个很高的共振峰.Concerning the vibrations that usually emerge in the electric power steering（EPS） system, the vibration modes of the control target, including three lumped masses-the steering wheel, the motor rotor and the output shaft, were studied based on the vibration theory. The study involved undumped system, viscous dumped system, and a most commonly used type EPS system --column-type EPS system. Two resonant frequencies were obtained with the Matlab/symbolic math toolbox. The results indicate that the control target has low damping, especially at low resonance frequency, which leads to a sharp peak on the Bode plot around the low resonance frequency.

关 键 词：汽车工程 电动助力转向系统 振动分析 阻尼 共振 

分 类 号：U467.5[机械工程—车辆工程]