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Impact of combined alignments and adverse weather conditions on vehicle skidding

Journal of Traffic and Transportation Engineering(English Edition) 2023年第1期10卷 116-131页

作者： Anas Alrejjal Khaled Ksaibati Department of Civil and Architectural Engineering University of WyomingLaramieWY 82070USA

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 *** 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 *** simulation tools provided the acting forces on each tire of the vehicle and the side friction(skidding)*** allowed for examining the interaction between vehicle dynamics and road geometry in such ***,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 ***,this examines the contributing factors that significantly influence the skidding *** 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 *** 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 *** 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 *** study is beneficial to Wyoming’s roadway agencies since hazardous sections having combined horizontal and vertical curves are ***,critical situations that require additional attention from law enforc

关键词： Vehicle dynamics simulations Combined horizontal and vertical curves Skidding margins Operating speed adverse weather Brakes application

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3D Object Detection Algorithm in adverse weather Conditions Based on LiDAR-Radar Fusion

3D Object Detection Algorithm in Adverse Weather Conditions ...

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第43届中国控制会议

作者： Zeyu Wu Qingwen Hou Xianzhong Chen Jie zhang Kexing Gao School of Automation and Electrical Engineering University of Science and Technology Beijing Shunde Innovation School University of Science and Technology Beijing Key Laboratory of Knowledge Automation for Industrial Processes of Ministry of Education University of Science and Technology Beijing

In adverse weather conditions such as rainy or foggy weather, the point cloud data from lidar may not reliably describe the environment. In such situations, the robust information from millimeter-wave radar, which is less susceptible to environmental interference, can compensate for the limitations of lidar. Effectively integrating the information from both radars to enhance the robustness of target detection under adverse weather conditions poses a challenge. To address this issue, a road scene multi-object detection algorithm based on the fusion of lidar and millimeter-wave radar in adverse weather conditions is proposed, leveraging improvements based on the CenterPoint framework. The algorithm incorporates a transformer-enhanced network and fuses information from both radars at the feature level. Experimental evaluations conducted on the Fog-nuscenes dataset, which underwent simulated foggy weather conditions, demonstrate that the proposed network achieves a mAP of 49.52%.Compared to the original CenterPoint network, this represents a significant improvement of 10.75%.

关键词： 3D object detection Sensor fusion Transformer adverse weather Self-driving

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A macroscopic traffic model based on weather conditions

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Chinese Physics B 2018年第7期27卷 179-189页

作者： Zawar H.Khan Syed Abid Ali Shah T.Aaron Gulliver Department of Electrical Engineering University of Engineering and TechnologyPeshawarPakistan Department of Electrical and Computer Engineering University of VictoriaPO Box 1700STN CSCVictoriaBC Canada

A traffic model based on the road surface conditions during adverse weather is presented. The surface of a road is affected by snow, compacted snow, and ice, which affects the traffic behavior. In this paper, a new macroscopic traffic flow model based on the transition velocity distribution is proposed which characterizes traffic alignment under adverse weather conditions. Two examples are considered to illustrate the effect of the transition velocity behavior on traffic velocity and density. Simulation results are presented which show that this model provides a more accurate characterization of traffic flow behavior than the well known Payne-Whitham model. The proposed model can be used to reduce accidents and improve road safety during adverse weather conditions.

关键词： macroscopic traffic flow anticipation Payne-Witham (PW) model adverse weather

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Concept Study of a Self-localization System for Snow-covered Roads Using a Four-layer Laser Scanner

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Automotive Innovation 2019年第2期2卷 110-120页

作者： Tetsushi Mimuro Naoya Taniguchi Hiroyuki Takanashi Faculty of Systems Science and Technology Akita Prefectural University84-4 EbinokuchiYurihonjoAkita 015-0055Japan Graduate School of Systems Science and Technology Akita Prefectural University84-4 EbinokuchiYurihonjoAkita 015-0055Japan College of Engineering Nihon University1 NakagawaraTokusadaTamuramachiKoriyamaFukushima 963-8642Japan

Many advanced driver assistance systems have entered the market,and automated driving technologies have been *** of them may not work in adverse weather conditions.A forward-looking camera,for example,is the most popular system used for lane detection but does not work for a snow-covered *** present paper proposes a self-localization system for snowy roads when the roadsides are covered with *** system employs a four-layer laser scanner and onboard sensors and uses only pre-existing roadside snow poles provided for drivers in a snowy region without any other road *** the landscape greatly changes in a short time during a snowstorm and snow removal works,it is necessary to restrict the landmarks used for self-localization to tall objects,like snow poles.A system incorporating this technology will support a driver’s efforts to keep to a lane even in a heavy snowstorm.

关键词： Advanced driver assistance systems adverse weather Laser scanner Self-localization system

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不利天气影响下“公司+农户”型订单契约设计

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农业经济研究 2016年第3期 128-137页

作者：伏红勇但斌

不利天气影响农业生产并使订单农业中各成员在履约过程中遭遇不可控风险，针对这一问题，构建了由风险厌恶的农户与风险中性的公司组成的两级农产品供应链随机利润模型，在条件风险价值(CVaR)准则下，建立了具有风险厌恶特性农户的CVaR... 详细信息

不利天气影响农业生产并使订单农业中各成员在履约过程中遭遇不可控风险，针对这一问题，构建了由风险厌恶的农户与风险中性的公司组成的两级农产品供应链随机利润模型，在条件风险价值(CVaR)准则下，建立了具有风险厌恶特性农户的CVaR决策模型，比较分析了不利天气对集中式与分散式决策模式下最优决策的影响。研究发现不利天气降低了供应链绩效而农户的风险厌恶特性则加剧了双边际效应，对此，设计了一种与天气指数和农户风险厌恶度相关的改进收益共享契约。研究表明：公司可依据不利天气影响的结果来设计订单契约以激励双方成为“收益共享、风险共担”的统一体，此外，在实施该订单契约后可实现农产品供应链的完美共赢协调，这弥补了分散式决策下的效率损失并增强了供应链系统的稳健性。

关键词：农产品供应链不利天气订单农业风险厌恶收益共享 CVaR准则 agricultural supply chain adverse weather risk aversion order farming CVaR criterion revenue sharing

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Performance evaluation framework of Wyoming connected vehicle pilot deployment program: summary of Phase 2 pre-deployment efforts and lessons learned

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Journal of Intelligent and Connected Vehicles 2019年第2期2卷 41-54页

作者： Mohamed M.Ahmed Guangchuan Yang Sherif Gaweesh University of Wyoming College of Engineering and Applied Science LaramieWyomingUSA Rhonda Young Gonzaga UniversitySpokaneWashingtonUSA Fred Kitchener McFarland Management LLCBoiseIdahoUSA

Purpose–This paper aims to present a summary of the performance measurement and evaluation plan of the Wyoming connected vehicle(CV)Pilot Deployment Program(WYDOT Pilot).Design/methodology/approach–This paper identiﬁed 21 speciﬁc performance measures as well as approaches to measure the beneﬁts of the WYDOT *** overview of the expected challenges that might introduce confounding factors to the evaluation effort was outlined in the performance management plan to guide the collection of system performance ***–This paper presented the data collection approaches and analytical methods that have been established for the real-life deployment of the WYDOT CV *** methodologies for assessing 21 speciﬁc performance measures contained within eight performance categories for the operational and safety-related *** were conducted on data collected during the baseline period,and pre-deployment conditions were established for 1 performance ***,microsimulation modeling was recommended to aid in evaluating the mobility and safety beneﬁts of the WYDOT CV system,particularly when evaluating system performance under various CV penetration rates and/or CV *** implications–The proposed performance evaluation framework can guide other researchers and practitioners identifying the best performance measures and evaluation methodologies when conducting similar research ***/value–To the best of the authors’knowledge,this is theﬁrst research that develops performance measures and evaluation plan for low-volume rural freeway CV system under adverse weather *** paper raised some early insights into how CV technology might achieve the goal of improving safety and mobility and has the potential to guide similar research activities conducted by other agencies.

关键词： Performance measures Connected vehicles Driver behaviors and assistance adverse weather Microsimulation modeling Wyoming connected vehicle pilot

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Research on the Comprehensive Analysis and Early Warning Expressway weather Information System

Research on the Comprehensive Analysis and Early Warning Exp...

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2015年中国智能自动化学术会议

作者： Wenfeng Liu Xun Li Li Zhang Research Institute of Highway MOT

This paper reviewed the development of the road weather information system in the developed countries and summarized the problems of its applications on expressway in China;second, proposed a new approach to achieve the dedicated weather information services on expressway through the in-depth data fusion of the macro-meteorological observation and forecasting data from meteorological sector and the road weather information system(RWIS) observation data and video surveillance data from the devices along the expressway;third, described the architecture, functions, process, and interface of the comprehensive analysis and early warning expressway weather information system;and finally, introduced the demonstration case and its results of the system’s application on the Jing-jin-tang expressway.

关键词： Road weather information system RWIS Expressway adverse weather Road safety Traveler information services Early warning

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