【作者】 张立军； 宁国宝； 余卓平；

【Author】 Zhang Lijun;Ning Guobao;Yu Zhuoping;College of Automotive Studies,Tongji University;

【机构】 同济大学汽车学院；

【摘要】 汽车制动器的低频抖动是汽车工业界急需解决的重要工程技术问题。制动抖动的重要负面效应之一就是会引起转向盘的剧烈振动。本文从试验研究和理论分析两个方面针对制动抖动引起的转向盘振动问题进行了系统研究。通过整车道路试验和基于试验信号的阶次分析和传递路径分析确定振源和传递途径。通过制动器台架试验明确了制动器发生抖动的根源与制动器振动时的摩擦-热-振动耦合效应的机理。同时,针对台架试验制动器和道路试验车辆分别建立基于MATLAB的制动器摩擦-热-振动耦合动力学模型和基于ADAMS的多刚体车辆整车动力学模型,对试验现象进行理论再现仿真分析。仿真分析结果表明,所建立的模型具有较为满意的工程精度,对于制动引起的转向盘振动问题的深入研究分析具有重要的工程应用价值。更多还原

【Abstract】 The prevention and control of brake judder and its various negative effects has been a key target of vehicle production.One of the effects is the unidirectional steering wheel vibration during vehicle braking.Experimental and theoretical investigation into "steering wheel vibration due to brake judder" is extensively presented in this paper.The vehicle road test is carried out under controlled braking conditions.During the test,the accelerations of brake caliper assembly,suspension low and upper Control arm,steering arm,tie rod and steering wheel,left and right wheel rotary speed,are measured by a multi-channel data acquisition system.The data processing focuses on order tracking analysis and transfer path analysis to work out the related resonant components.A disc brake assembly,with deliberately designed disc thickness variation and surface run-out combinations,is tested on a brake dynamometer.And the signals of disc deformation,disc surface temperature,caliper acceleration,hydraulic pressure,speed and braking torque are simultaneously measured.Based on the data analysis,the friction-thermal-mechanical coupled effect of disc brake,the contribution of DTV and SRO to torque and pressure fluctuations are described.At the same time,modeling and simulation are carried out to reproduce and explain the vehicle road test and brake dynamometer test.A frictionthermal-mechanical coupled dynamics simulation of disc brake is programmed in MATLAB.And a multi-body-dynamic vehicle model with a full description of tire road friction,suspension and steering system,rubber bushings and vehicle inertia,is also established in ADAMS.On the basis of the comparison between the numerical results and the measurement results,the two models are validated and optimized.In sum,the two models are proved effective in predicting and validating of the influences of various factors from disc brake system,suspension system,steering system and tire,and therefore,they can be used for chassis design to control steering wheel vibration due to brake judder.更多还原