Open Journal of Transportation Technologies

Journal Information
ISSN / EISSN : 2326-3431 / 2326-344X
Published by: Hans Publishers (10.12677)
Total articles ≅ 357
Filter:

Latest articles in this journal

若闫 琦
Open Journal of Transportation Technologies, Volume 11, pp 7-16; https://doi.org/10.12677/ojtt.2022.111002

Abstract:
# 为了减少大型车辆内轮差引发的交通事故,从大型车辆内轮差事故特征入手,分析其事故车型、事故死亡率、事故空间特征及时间分布特征,进而对大型车辆不同交叉口右转时的内轮差形成机制进行分析。通过对大型车辆转弯情况调研,得出驾驶人转动方向盘随车辆轴距与交叉口长宽比的拟合函数,建立更趋向于实际的车辆转弯理论模型。分析获取的大型车辆右转内轮差模型,从人、车等方面提出更适宜的内轮差事故安全对策。 In order to reduce the traffic accidents caused by the inner wheel difference of large vehicles, starting from the characteristics of the large vehicle inner wheel difference accidents, the accident models, accident mortality, accident spatial characteristics and time distribution characteristics are analyzed, and then the characteristics of the large vehicles turning right at different intersections were analyzed. By investigating the turning situation of large vehicles, the fitting function of the driver turning the steering wheel with the wheelbase of the vehicle and the aspect ratio of the intersection is obtained, and a theoretical model of vehicle turning that tends to be more realistic is established. Analyze the acquired right-turn inner wheel difference model of large vehicles, and propose more suitable safety countermeasures for inner wheel difference accidents from the aspects of people and vehicles.
明钟 小
Open Journal of Transportation Technologies, Volume 11, pp 17-30; https://doi.org/10.12677/ojtt.2022.111003

Abstract:
# 公路隧道安全性评价是保障隧道交通安全的重要技术手段。但是由于现行标准中隧道安全性评价范围及技术要求不够具体,造成小部分项目安全性评价报告质量不能满足实际需要。本文在《公路项目安全性评价规程》(T/CECS G: E10-2021)编制过程中,总结相关科研成果及工程实践经验,从隧道路段的线形、交通安全设施、机电设施、应急救援等方面,明确了工程可行性研究阶段、设计阶段、交工阶段及运营阶段中公路隧道安全性评价的范围及技术要点。本文作为《公路项目安全性评价规程》(T/CECS G: E10-2021)隧道部分条文规定的解读,阐述了与《公路项目安全性评价规范》(JTG B05-2015)相关条文的差异,明确了修订条文和新增条文的内容、目的、原因、背景等,划分了安全性评价与设计和质量管理等相关工作界面,目的是通过解读帮助标准使用人员和评价人员更好理解和运用《公路项目安全性评价规程》(T/CECS G: E10-2021)隧道部分条文,把握评价重点内容、评价范围和评价深度,有效地提高公路隧道安全性评价工作的质量,进而提升公路隧道的安全水平及运营效率。文章成果写入《公路项目安全性评价规程》(T/CECS G: E10-2021)、贵州省公路项目安全性评价指南(2020-141-022)。 Highway tunnel safety evaluation is an important technical way to guarantee traffic safety. How-ever, the scope and technical requirements of tunnel safety evaluation in the current standard are not specific and detail enough, resulting in the quality of some evaluation reports could not meet the practical needs. The authors summarize the recent research achievements and engineering practice experience during drafting Technical Specifications for Highway Safety Audit (T/CECS G: E10-2021) (TSHSA). In TSHSA, the authors have put forward the scope and main technical points of road tunnel safety evaluation in the feasibility stage, design stages, pre-opening traffic stage and operation stage of highway, including tunnel alignments, traffic safety facilities, mechanical and electrical facilities, emergency rescue, etc. This paper is interpreted as the tunnel part of TSHSA. The paper explains the differences between TSHSA and the relevant tunnel provisions of highway safety audit (JTG B05-2015), has cleared about the purpose, cause, background, etc., of the revised provisions and the new provisions, divides the evaluation interface with the design and quality control related work. The paper’s purpose is to help the user of auditors and readers understand, grasp the evaluation scope, key contents, and evaluation depth, which will be to guarantee effectively the quality of highway tunnel safety evaluation and improve the safety level and operational efficiency of the highway tunnel. The conclusions of this paper will be written into TSHSA and Guizhou Provincial Highway Safety Audit Guidelines (2020-141-022).
为陈 大
Open Journal of Transportation Technologies, Volume 11, pp 1-6; https://doi.org/10.12677/ojtt.2022.111001

Abstract:
# 当前我国铁路集装箱时效性较差、环节较繁琐,造成不少适箱货源流失。在铁路实货制改革的背景下,铁路货运电子商务平台的建立有效提高了铁路集装箱货运的电子化水平,并在一定程度上简化了货运程序,但对货源的吸引作用仍然有限。本文将通过分析货运电子商务平台对铁路货运发展的作用,提出利用铁路货运电子商务平台的服务功能吸引适箱货源的策略,以提高铁路集装箱运量,为我国铁路货运降本提质提供决策参考。At present, China’s railway containers have poor timeliness and cumbersome links, resulting in the loss of many suitable container sources. Under the background of railway real goods system reform, the establishment of railway freight e-commerce platform has effectively improved the electronic level of railway container freight and simplified the freight procedure to a certain ex-tent, but its attraction to the source of goods is still limited. By analyzing the role of freight e-commerce platform in the development of railway freight, this paper puts forward the strategy of using the service function of railway freight e-commerce platform to attract suitable container cargo sources, so as to improve the railway container traffic volume and provide decision-making reference for reducing the cost and improving the quality of railway freight in China.
义魏 文
Open Journal of Transportation Technologies, Volume 10, pp 207-211; https://doi.org/10.12677/ojtt.2021.103023

Abstract:
为实现低碳运输发展目标,本文基于分析运输各个环节碳排放的特点,着重研究了基础设施、运输工具、运输模式以及运输集成化管理变化引起的碳排放变化,提出几种降低碳排放的措施,探讨实现2030碳达峰目标几种可行性办法以及2060实现碳中和目标的展望。In order to achieve the development goal of low-carbon in transportation, the influence on carbon dioxide emissions, which is caused by the conditions of infrastructure, the types of vehicles, the modes of transportation and the integrated management in transportation, is analyzed emphatically in this paper. Based on this analysis, several measures to reduce carbon dioxide emissions are proposed and a number of feasible solutions to achieve the goal of peaking carbon dioxide emissions before 2030 and carbon neutral before 2060 are envisaged.
华饶 明
Open Journal of Transportation Technologies, Volume 10, pp 288-299; https://doi.org/10.12677/ojtt.2021.104034

Abstract:
本文提出了一种需求响应型公交系统的数学模型,以此满足大规模的公交运行网络下密集的乘客乘车需求,并有效提高公共交通系统的服务质量与可达性。此方法的设计原理主要是通过引导乘客到达距离最近的公交车站,并合理安排公交车将乘客顺利送至交通系统中的换乘枢纽站点。为此,本研究提出了一种多目标混合整数线性规划模型,目的是找到能够使乘客步行距离、公交运行时间、乘客偏好乘车时间窗与车辆到达时间窗差值均为最小值的公交运行线路。针对这一混合整数规划模型,进一步提出了基于蚁群算法框架的三阶段混合启发式算法。最后引入一个具体的面向实际路网的案例对本次研究中构建与开发的模型和算法进行有效性分析。 In this paper, a mathematical model of Demand Responsive Transit system is proposed considering the intensive passenger demand in large-scale public transport network, to effectively improve the service quality and accessibility of urban transit system. The design logic of this method is to guide passengers to the nearest bus station, and dispatch buses reasonably to transport passengers to the connected station of the major transit system. Therefore, this paper proposes a multi-objective mixed integer linear programming model, which aims to design the bus routes that can minimize the difference between passenger walking distance, bus traveling time, and the difference between the passenger preference time window and vehicle arrival time window. For this mixed integer programming model, a three-stage hybrid heuristic algorithm based on ant-colony algorithm framework is proposed. Finally, a specific case applied to the real road network is introduced to analyze the effectiveness of the proposed model and algorithm in this research.
民朱 献
Open Journal of Transportation Technologies, Volume 10, pp 266-274; https://doi.org/10.12677/ojtt.2021.104031

Abstract:
顶推法施工过程中由于环境变化以及人为因素等影响会产生偏位误差。本文以苏州剑科路钢箱梁桥项目的顶推法施工为依据,采用有限元软件Midas Civil分析了顶推过程中的最不利工况,并采用有限元软件Abaqus分析了三个方向的施工偏位误差对最不利工况下钢箱梁的受力状态的影响,希望能够为其他采用顶推法施工的钢箱桥梁项目提供借鉴和参考。 In the process of incremental construction, deviation error will be produced due to environmental change and human factors and so on. In this paper, based on the incremental construction process of Suzhou Jianke Road bridge project, the finite element software Midas Civil was used to analyze the most unfavorable working conditions in the process of incremental construction. The finite element software ABAQUS was used to analyze the influence of construction deviation errors in three directions under the most unfavorable working conditions. It is hoped that this paper can provide a reference for other steel box bridge projects which adopt incremental construction method.
葛 晓
Open Journal of Transportation Technologies, Volume 10, pp 36-40; https://doi.org/10.12677/ojtt.2021.101005

Abstract:
专用轨回流作为一种可以彻底解决杂散电流问题的新型供电制式已经被越来越多的城市轨道交通所采用。但由于车辆检修时需要对车辆转向架等重要部件进行仪器检测,部分检修还需要登车作业,所以车辆基地库内回流轨的布置,不可避免的会给车辆检修造成一定影响。针对这一现象,本文根据实际项目经验及多方考察,提出了一种兼容多种车型的车辆基地库内专用回流轨的平面布置方式,仅需通过车辆长度、库内线路长度等参数即可确定回流轨的安装位置和安装长度。该方式可以最大程度的减少库内回流轨的布置对车辆检修的影响,提高车辆的检修效率且有利于实现检修库房的标准化设计,工程实用性较好。As a new type of power supply system which can completely solve the problem of stray current, the return current of special rail has been adopted by more and more urban rail transit. However, due to the inspection of important components such as Bogies and other important parts of the vehicle during vehicle maintenance, some maintenance also requires boarding operation, so the layout of return track in the depot of the vehicle base will inevitably have a certain impact on vehicle maintenance. In view of this phenomenon, according to the actual project experience and multi-party investigation, this paper puts forward a plane layout mode of special return track in the depot of vehicle base which is compatible with various vehicle types. The installation position and length of return track can be determined only by the parameters such as vehicle length and line length in depot. This method can reduce the impact of the layout of return track on vehicle maintenance to the greatest extent, improve the maintenance efficiency of vehicles, and is conducive to the realization of standardized design of maintenance warehouse, with good engineering practicability.
安敖 建
Open Journal of Transportation Technologies, Volume 10, pp 1-10; https://doi.org/10.12677/ojtt.2021.101001

Abstract:
为了研究轨道车辆在运行状态下,采用刚柔耦合建模方式的车辆系统对动力学性能的影响程度,本文以某型高速动车组拖车为研究对象,基于SIMPACK多体动力学软件分别建立多刚体车辆模型和由柔性轮对、柔性构架以及柔性车体结构耦合的刚柔耦合车辆模型,通过对两者在不同运行速度和不同运行线路工况仿真计算的结果进行对比,从而评价采用刚柔耦合建模方式对动力学性能方面的影响。结果表明:对比多刚体车辆计算结果,刚柔耦合车辆整体上在稳定性、运行品质和曲线通过性能等指标结果表现较差,尤其在高速运行状态下,刚柔耦合车辆在垂向方向上影响更加剧烈。 In order to study the influence of the rigid-flexible coupling vehicle system on the dynamic performance of the railway vehicle in the running state, this paper takes a high-speed EMU trailer as the research object, and builds the rigid-flexible coupling vehicle model based on SIMPACK multi-body dynamics software and the rigid-flexible coupling vehicle model coupled by flexible wheel set, flexible frame and flexible body structure. In order to evaluate the influence of rigid-flexible coupling modeling on the dynamic performance, the results of simulation calculation are compared in different operating speeds and different operating conditions. The results show that compared with the calculation results of multi rigid vehicle, the rigid-flexible coupling vehicle as a whole shows poor performance in stability, running quality and curve passing performance, especially in the high-speed running state, the vertical impact of rigid flexible coupling vehicle is more severe.
军邓 社
Open Journal of Transportation Technologies, Volume 10, pp 71-77; https://doi.org/10.12677/ojtt.2021.102009

Abstract:
随着新型技术的迅速发展,基于视频的车辆速度识别引起了研究人员的广泛关注。然而,在速度采集过程中仍然存在许多挑战,包括车辆识别精度低、跟踪效果差、镜头抖动等。本文提出了一种车辆速度检测方法。首先,构建了一个基于无人机特定飞行高度下的数据集,并通过深度学习网络训练获得权重文件。然后利用YOLO检测算法、Deep-sort跟踪算法获得车辆的运动轨迹。在此基础上提出了一种基于线性回归思想的车辆速度计算方法。试验表明,本方法具有较高的精度和抗干扰能力。 With the rapid development of new technology, vehicle speed estimation based on video has at-tracted wide attention from researchers. However, there are still many challenges in extracting speed information from UAV videos, including the low accuracy of vehicle identification, the poor tracking effect, the lens jitter. In this paper, we propose a method for vehicle speed estimation. Firstly, we build a traffic dataset based on UAV for specific height, and obtain weight file through the deep-learning algorithm, and then obtain the trajectory through YOLO algorithm and Deep-sort algorithm. Thereafter, we propose a method to estimation vehicle speed based on linear regression algorithm. The result of experiments shows that the strategy has stronger anti-jamming ability and higher precision.
Back to Top Top