Influence analysis of stiffness of suspension torsion bar and anti-roll bar on vehicle steering sensitivity

LIU Jing-zhong1，FENG Yan2，ZHAO Yan-wei3
（1. College of Education Science and Technology， Zhejiang University of Technology， Hangzhou 310014， China；
2. Institute of Power Machinery and Vehicle Engineering， Zhejiang University， Hangzhou 310027， China；
3. College of Mechanical Engineering， Zhejiang University of Technology， Hangzhou 310014， China）

Abstract：  In order to study the effect of stiffness of the suspension and anti-roll bar on the vehicle handling performance，and provide reference for suspension design and adjustment afterwards，two virtual prototype and their variants without anti-roll bar and front suspension assembly anti-roll bar，based on a light bus for the prototype，were structured in ADAMS/Car. Through simulation experiment with input of steering wheel angle step，the curves of effect of angle stiffness of front suspension torsion bar and anti-roll bar on vehicle steering sensitivity were obtained. The results show that，on two models with and without anti-roll bar，steering sensitivity respectively produces about 20% and 1% decline of the range of experience while the angle stiffness of torsion bar increased from 0.5 to 2.0 times of the base stiffness；steering sensitivity respectively produces about 10% increase or 1% decline of the range of experience while the angle stiffness of anti-roll bar decreases from the base angle stiffness to 0 or increases to 2.0 times of the base stiffness.
Key words： torsion bar；anti-roll bar；angle stiffness；steering sensitivity；ADAMS/Car