Impact of combined alignments and adverse weather conditions on vehicle skidding

IF 7.4 2区 工程技术 Q1 ENGINEERING, CIVIL
Anas Alrejjal, Khaled Ksaibati
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Abstract

Roadways in Wyoming are characterized by challenging horizontal profiles, vertical profiles, a combination of the two and adverse weather conditions, all of which affect vehicle stability. In this study, we investigated the impact of different operating speeds when negotiating combined horizontal and vertical curves under unfavorable environmental conditions on Wyoming's interstates via vehicle dynamics simulation software. The simulation tools provided the acting forces on each tire of the vehicle and the side friction (skidding) margins. This allowed for examining the interaction between vehicle dynamics and road geometry in such alignments. Also, linear regression analysis was implemented to investigate the skidding margins based on the simulation results to demonstrate when a vehicle is more likely to deviate from its desired trajectory. Specifically, this examines the contributing factors that significantly influence the skidding margins. The results indicated that: 1)the skidding margins are dramatically decreased by adverse weather conditions even with lower degree of curvature and gradient values of combined curves and more particularly at higher operating speeds conditions. Increasing the vehicle speed on the curve by 10%, the skidding margin dropped by 15%. 2) Compared to heavy trucks and sports utility vehicles (SUVs), passenger cars require the highest side friction demand. 3) The effect of applying brakes on vehicle stability depends on the road surface condition; applying the brakes on snowy road surfaces increases the potential of vehicle skidding especially for heavy trucks. This study assessed the curve speed limits and showed how important to assign safe and appropriate limits speed since the skidding likelihood is significantly sensitive to the vehicle speeds. This study is beneficial to Wyoming's roadway agencies since hazardous sections having combined horizontal and vertical curves are identified. Also, critical situations that require additional attention from law enforcement agencies are pinpointed. Finally, recommendations that are valuable to roadway agencies are made based on this study's findings.

组合线形和恶劣天气条件对车辆打滑的影响
怀俄明州的道路具有挑战性的水平剖面、垂直剖面、两者的结合以及恶劣的天气条件,所有这些都会影响车辆的稳定性。在这项研究中,我们通过车辆动力学模拟软件,研究了在不利环境条件下通过水平和垂直组合曲线时不同运行速度对怀俄明州州际公路的影响。模拟工具提供了车辆每个轮胎上的作用力和侧面摩擦(打滑)裕度。这允许检查此类线形中车辆动力学和道路几何形状之间的相互作用。此外,还根据模拟结果进行了线性回归分析,以研究打滑裕度,从而证明车辆何时更有可能偏离其期望轨迹。具体地说,这考察了显著影响打滑裕度的因素。结果表明:1)即使组合曲线的曲率和坡度值较低,尤其是在较高的运行速度条件下,恶劣的天气条件也会显著降低打滑裕度。将弯道上的车速提高10%,打滑幅度下降15%。2) 与重型卡车和运动型多用途车(SUV)相比,乘用车对侧摩擦的需求最高。3) 制动对车辆稳定性的影响取决于路面状况;在雪地路面上刹车会增加车辆打滑的可能性,尤其是重型卡车。这项研究评估了弯道速度限制,并表明了分配安全和适当的速度限制是多么重要,因为打滑的可能性对车速非常敏感。这项研究有利于怀俄明州的道路管理机构,因为已经确定了具有组合水平和垂直曲线的危险路段。此外,还指出了需要执法机构进一步关注的关键情况。最后,根据本研究的发现,提出了对道路管理机构有价值的建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
13.60
自引率
6.30%
发文量
402
审稿时长
15 weeks
期刊介绍: The Journal of Traffic and Transportation Engineering (English Edition) serves as a renowned academic platform facilitating the exchange and exploration of innovative ideas in the realm of transportation. Our journal aims to foster theoretical and experimental research in transportation and welcomes the submission of exceptional peer-reviewed papers on engineering, planning, management, and information technology. We are dedicated to expediting the peer review process and ensuring timely publication of top-notch research in this field.
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