High speed shimmy of vehicle steering system
Date Issued
2006
Date
2006
Author(s)
Jiaon, Qiu-Fen
DOI
zh-TW
Abstract
When an automobile driven under some conditions, the tires may swing about the kingpin axis continuously, cause the yawing of car body, and the vibration may be transferred to the steering system to induce the rotating vibrating of steering wheel. This phenomenon is termed as shimmy, which has some difference from usual car body vibrations.
This paper reviewed the parameters related to the shimmy problem of cars. The multi-body dynamic model for a whole car was established, to predict the car speed when significant shimmy will occur. The shimmy experiments of a real car on chassis dynamometer were performed to determine the car shimmy speed; the experimental results were also used as reference basis for parameter updating of analysis model, in order to reduce the model uncertainties. The design sensitivity analysis and design optimization for the modified model were carried out to find out the sensible design parameters, which will provide important information to select a reasonable way form improvement of shimmy levels.
Subjects
擺振
多體動力學
全車模型
靈敏度分析
最佳化
實車試驗
shimmy
multi-body dynamics
sensitivity
optimization
real car experiment
Type
thesis