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Analyzing on the Effect of Temperature of Vehicle Shimmy with Clearance of Movement Pair

Author: DongQing
Tutor: LuJianWei
School: Hefei University of Technology
Course: Vehicle Engineering
Keywords: clearances of movement pair temperature effect nonlinear dynamic vehicle shimmy chaotic motion
CLC: U461.61
Type: Master's thesis
Year: 2010
Downloads: 38
Quote: 0
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Abstract


Steering wheel shimmy is a movement which has many negative affects on automobile. It can badly affect the handing stability, ride comfort, power, fuel economy and safety of automobiles when it develops to a degree. It is generally agreed that with the front axle lateral body movement around the automobile before the bridge longitudinal axis of the roll motion and the front wheels around kingpin yaw movement of the composite motion.Steering wheel shimmy is a question which affected by many factors like the steering trapezoid of clearances, ties and temperature. Among them, the extreme cases of climate temperature changes have great influence on crank linkage with clearance and clearance system auto steering wheel. Considering the temperature effect on the gap with wheel shimmy system, firstly we should simply the steering trapezoid with clearance into crank with clearance. Then we should simulate and analyze the phenomenon of shimmy with computer. And we should focus on exploring the effects on the automobile shimmy system affected by the clearance in change which is caused by the temperature effects. Researching on the influence of shimmy caused by the temperature effects could provide more theoretical guidance to explore effective measures for anti-swing automobile steering system.This article reviewed and summarized the domestic and external Steering Wheel of research results, then clarified the mechanism of production shimmy. It briefly described the involved temperature field and the concept of residual stress, established the cylinder model of hole and shaft parts and theoretically analyzed such a cylinder in uniform temperature field and the non-uniform temperature field in cylindrical coordinate system strain relationship of the relative position. Turning the three free model of crank into state variable form and establishing the dynamic model with crank clearance, the system would be periodic or chaotic motion caused by the temperature affects when got the proper clearance. It analyzed the automobile wheel shimmy mechanism by combining the models and it also indicated that the temperature change could induce steering wheel vibration system doing irregular movement back and forth in a chaotic state when the gap was proper. By graphical observation, and thus got a threshold or critical temperature range which didn’t cause the system into chaos. This threshold or critical temperature range could guide the practical work process to eliminate or reduce the shimmy on the impact of automobile driving.In the end of this article, they were the summary of the work and the prospects for future research.

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CLC: > Transportation > Road transport > Automotive Engineering > Car theory > Vehicle handling and stability > Wheel shimmy
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