Analysis of a special purpose vehicle’s behaviour after an edge drop-off onto a soft shoulder
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- 作者：W. Wach ; L. Prochowski
- 关键词：Key WordsVehicle operation ; Special purpose vehicle ; Steerability ; Road traffic safety ; Driver training
- 刊名：International Journal of Automotive Technology
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：18
- 期：1
- 页码：55-67
- 全文大小：1,833 KB
- 刊物类别：Engineering
- 刊物主题：Automotive and Aerospace Engineering and Traffic
- 出版者：The Korean Society of Automotive Engineers
- ISSN：1976-3832
- 卷排序：18
文摘
The article concerns the dynamics of a four-axle 20 ton special purpose vehicle in the driver’s panicky defensive manoeuvre resulting from edge drop-off of wheels onto a soft shoulder. A calculation model in the PC-Crash software environment has been developed to include the complex mechanism of the soft soil response to the wheel movement. The analysis of the results indicates the danger manifested by strong wheels vibrations, instantaneous change of vehicle steerability characteristics and a high rate of increase of the yaw angle and vehicle pitch during braking with steered wheels turned. The calculations indicate an extremely adverse effect of the phase of vehicle oversteer which in the analysed motion of the vehicle lasts over 1.5 s. The calculations prove that in such a short time the driver has very little chance of any practical response to the non-typical behaviour of the vehicle which otherwise is, in general, understeered.