Abstract
5-DOF dynamic model of vehicle shimmy system with clearance in universal joint of steering handling mechanism is presented. The sub model of cross shaft universal joint with clearance is built based on Hertz' theory, and two-state model is applied to describe the contact force. The sub model of the universal joint is combined with the simplified dynamic model of steering system, and a 5-DOF dynamic model of vehicle shimmy system with consideration of assembling clearance in universal joint of steering handling mechanism is presented. Based on this model, numerical analysis is carried out to evaluate the influence of clearance in universal joint on the dynamic behavior of the vehicle shimmy system. The results show that the clearance and some other parameters, such as vehicle speed, have coupled contribution to the dynamic behavior of the vehicle shimmy system. The conclusions provide theoretical basis for effective attenuation of vehicle shimmy, especially for those in-service vehicles.
Highlights
Vehicle shimmy can be found widely in vehicles, especially in in-service vehicles due to wear of steering mechanism
The universal joint with clearance between the cross shaft neck and universal joint fork is modeled based on Hertz law, and a 5-DOF dynamic model of vehicle shimmy system with consideration of clearance in handling mechanism is presented
Since other parameters of the system are fixed, it can be deduced that the change in the dynamic behavior of the vehicle shimmy system is originated from the variation of transmission characteristic of the universal joint
Summary
Vehicle shimmy can be found widely in vehicles, especially in in-service vehicles due to wear of steering mechanism. According to previous research of the authors’ group, it has been verified that there are some obvious differences in the dynamic behavior of the vehicle shimmy system with or without consideration of clearances in steering mechanism [12,13,14]. In this paper, the influence of clearance in universal joint of steering handling mechanism on the dynamic behavior of vehicle shimmy system is discussed. The universal joint with clearance between the cross shaft neck and universal joint fork is modeled based on Hertz law, and a 5-DOF dynamic model of vehicle shimmy system with consideration of clearance in handling mechanism is presented. Numerical analysis of the dynamic response of the vehicle shimmy system with clearance in handling mechanism is carried out, and influence of the clearance on the dynamic behavior of the vehicle shimmy system is evaluated. This will provide theoretical basis for improvement of vehicle shimmy control
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