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Drivers’ sight distance of tunnel entrance and exit based on support vector regression 基于支持向量回归的隧道出入口驾驶员视距分析
Pub Date : 2022-12-22 DOI: 10.1117/12.2657827
Ting Shang, Jiaxin Lu, Wenquan Cai, Dongjing Li, Tong Wu, Yufan Wang, Hanjin Lei
To study the variation law of driver's sight distance at tunnel entrance and exit, an actual vehicle test was conducted on an expressway in Chongqing (a total length of 160 km, 36 tunnels, including 4 short tunnels, 8 middle tunnels, 14 long tunnels, and 10 extra-long tunnels) in non-peak hours. Eye-tracking data, illuminance, and velocity were collected by eye-tracker, illuminance meter, and non-contact velocimetry with multi-function respectively. Based on the image illuminance extraction method, the illuminance of tunnel entrance and exit were obtained through Matlab. According to the tunnel parameters in reality, the scale model test was designed, and the driving simulation test was carried out to obtain the driver's sight distance at the tunnel entrance and exit. The support vector regression sight distance calculation model was constructed to analyze the relationship among the driver's driving sight distance, velocity, and illuminance to inspect the driver's sight distance at the entrance and exit of the tunnel and put forward some improvement measures.
为研究隧道出入口驾驶员视距变化规律,在重庆某高速公路(全长160 km, 36条隧道,其中短隧道4条,中隧道8条,长隧道14条,超长隧道10条)非高峰时段进行了实车试验。采用眼动仪、照度计和非接触式多功能测速仪分别采集眼动数据、照度和速度。基于图像照度提取方法,通过Matlab实现了隧道出入口的照度提取。根据实际隧道参数,设计了比例模型试验,并进行了驾驶模拟试验,获得了驾驶员在隧道出入口的视线距离。构建支持向量回归视距计算模型,分析驾驶员驾驶视距与速度、照度之间的关系,检验驾驶员在隧道出入口的视距,并提出改进措施。
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引用次数: 0
Research on traffic state of private car in urban area based on agent cellular automata model 基于agent元胞自动机模型的城市私家车交通状态研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2657957
X. Lu
For the local urban regional traffic with multiple road intersections, the modeling and simulation are carried out in combination with the background of private car commuting, and a private car travel model based on agent cellular automata model is proposed. The effectiveness of the model is verified by analyzing the real traffic scenarios such as recurrence following, acceleration and deceleration, and starting and stopping at traffic lights. The impact of the number of private cars and whether traffic lights are set on the roads on the traffic efficiency of urban areas at multiple intersections is discussed with the average waiting time as the index. The results show that the model can effectively simulate the driving behavior of private cars. The average speed is inversely proportional to the number of private cars and directly proportional to the average waiting time. Setting traffic lights can increase the number of stops. When local traffic flow is not saturated, setting traffic lights will affect traffic efficiency. When local traffic flow is saturated, setting traffic lights can reduce traffic delay and waiting time.
针对具有多个路口的城市局部区域交通,结合私家车通勤的背景进行建模仿真,提出了一种基于agent元胞自动机的私家车出行模型。通过对重复跟随、加减速、红绿灯启停等真实交通场景的分析,验证了该模型的有效性。以平均等待时间为指标,讨论了私家车数量和道路上是否设置红绿灯对城市多个路口交通效率的影响。结果表明,该模型能够有效地模拟私家车的驾驶行为。平均速度与私家车数量成反比,与平均等待时间成正比。设置红绿灯可以增加停车次数。当局部交通流量不饱和时,设置红绿灯会影响交通效率。当局部交通流量饱和时,设置红绿灯可以减少交通延误和等待时间。
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引用次数: 0
Dynamic effect of multiple dimensions of smartness on urban sustainability: based on PVAR model 智慧度多维度对城市可持续性的动态影响——基于PVAR模型
Pub Date : 2022-12-22 DOI: 10.1117/12.2657925
Mingke Sha
Smart cities play an important role in urban sustainability. However, the impacts on sustainability in multiple dimensions are dynamic at various stages of development. Most of the existing studies have only explored the impact on a single-dimensional sustainability, and the long-term dynamic impact has not been discussed in depth and in quantity. Taking 57 cities in China as examples, this study explores the dynamic impact of smart cities on urban environmental, economic and social sustainability, using the Panel VAR (PVAR) model after performing the unit-root tests, the selection of the optimal lag orders and the Granger causality test. Besides, further discussions on urban agglomerations are made, categorized by population density and geographical locations. The results indicate that ICT has positive effect in early stage but negative impact in the second period on social sustainability. The positive impact of industrial structure on environmental sustainability is strengthened but then weakened. The impact of industrial structure on social sustainability is negative in medium- and high-density cities but positive in low-density cities. Finally, the paper will provide policy recommendations for sustainable development in different periods from the perspective of smartness.
智慧城市在城市可持续发展中发挥着重要作用。然而,在不同的发展阶段,对可持续性在多个维度上的影响是动态的。现有的研究大多只探讨了对单一维度可持续性的影响,对长期动态影响的探讨还不够深入和定量。本研究以中国57个城市为例,在进行单位根检验、最优滞后阶数选择和格兰杰因果检验后,采用面板VAR (PVAR)模型,探讨智慧城市对城市环境、经济和社会可持续性的动态影响。此外,根据人口密度和地理位置对城市群进行了进一步的讨论。结果表明,信息通信技术对社会可持续性的影响在前期为正,在后期为负。产业结构对环境可持续性的正向影响先增强后减弱。产业结构对社会可持续性的影响在中高密度城市呈负向,在低密度城市呈正向。最后,本文将从智慧的角度为不同时期的可持续发展提供政策建议。
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引用次数: 0
Analysis of the accuracy of vehicle detection based on multiple linear regression 基于多元线性回归的车辆检测精度分析
Pub Date : 2022-12-22 DOI: 10.1117/12.2658654
Mingqin Chen, Heng Wang, Shuao Zhang, Jiangfeng Wang
Traffic volume surveys are a key factor in determining the state of road traffic and are a necessary basis for activities such as traffic planning, road construction, traffic control and management and engineering economic analysis. Most traffic volume surveys count vehicles separately by type, so accurate identification of vehicle types is particularly important. This paper is based on traffic volume survey data from eight detection methods for different vehicle types with separate detection counts. Statistical and correlation analyses were carried out separately, culminating in a multiple linear regression model, which yielded specific relationships between the effects of the different models when performing the tests.
交通量调查是确定道路交通状况的关键因素,是交通规划、道路建设、交通控制与管理、工程经济分析等活动的必要依据。大多数交通量调查都是按车辆类型单独统计的,因此准确识别车辆类型尤为重要。本文基于8种检测方法的交通量调查数据,这些方法对不同的车辆类型进行了单独的检测计数。统计分析和相关分析分别进行,最终建立了一个多元线性回归模型,该模型在执行测试时得出了不同模型效果之间的具体关系。
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引用次数: 0
Analysis of dynamic response of vehicle rail under the combined action of flat scar and uneven subgrade settlement 平疤与不均匀路基沉降共同作用下车辆轨道动力响应分析
Pub Date : 2022-12-22 DOI: 10.1117/12.2659261
Binqiang Li, Guangtian Shi, L. Yang, Peng Li, Chenyu Fang, Yukui Wang
Uneven settlement of roadbed and flat scar of wheel are the main diseases of railway vehicles in operation, which have obvious influence on the dynamic response of wheel-rail system and traffic safety. In order to study the influence of two kinds of diseases on traffic safety, a vehicle-track coupling dynamic model was established, and the dynamic response of the vehicle-track system was discussed under the conditions of different settling wavelength, amplitude, speed and length of flat scar. The results show that the impact response of flat scar has great influence on the vertical force of wheel and rail and the load reduction rate of wheel weight, and the amplitude and wavelength of subgrade settlement have great influence on the vertical acceleration of vehicle body. When the train runs at 100km/h, it is recommended that the wavelength of uneven subgrade settlement is greater than 10m, the amplitude is less than 10mm, and the length of flat scar is less than 40mm.
路基不均匀沉降和车轮扁平疤痕是轨道车辆运行中的主要病害,对轮轨系统的动力响应和行车安全有着明显的影响。为了研究两种病害对交通安全的影响,建立了车辆-轨道耦合动力学模型,讨论了不同平疤沉降波长、振幅、速度和长度条件下车辆-轨道系统的动态响应。结果表明:平疤冲击响应对轮轨垂直力和轮重减载率有较大影响,路基沉降幅度和波长对车身垂直加速度有较大影响。当列车以100km/h运行时,建议不平整路基沉降波长大于10m,振幅小于10mm,平疤长度小于40mm。
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引用次数: 0
Analysis method of congestion degree of rail transit station platform 轨道交通车站站台拥挤程度分析方法
Pub Date : 2022-12-22 DOI: 10.1117/12.2657859
Jin Jian, Xiao Liang
In order to grasp the actual congestion level, travel safety and improve the management level of urban rail transit station, and study the analysis method of platform passenger congestion, this paper uses video technology to obtain the location distribution of passengers at Xi’dan station of Beijing Metro, and studies the distribution process and law of waiting passengers. Firstly, the individual and group behaviors of passengers on the platform are studied, and the actual distribution of passengers in a waiting period is selected to facilitate the division of the platform area; Based on the clustering analysis of density, Density-based clustering analysis (DBSCAN) algorithm can cluster the distribution data of passengers on the platform to realize the density division of the data set, which can effectively solve the clustering problem of the data set with uneven density distribution. Through the visualization of clustering results, it can reflect the aggregation and distribution characteristics of passenger group behavior to a certain extent.
为了掌握城市轨道交通车站的实际拥堵程度,保障出行安全,提高管理水平,研究站台乘客拥堵的分析方法,本文利用视频技术获取北京地铁西丹站乘客的位置分布,研究候车乘客的分布过程和规律。首先,对站台上乘客的个体和群体行为进行研究,选取候车时段乘客的实际分布,便于站台区域的划分;基于密度的聚类分析(DBSCAN)算法在密度聚类分析的基础上,对站台乘客分布数据进行聚类,实现数据集的密度划分,可以有效解决密度分布不均匀的数据集的聚类问题。通过聚类结果的可视化,可以在一定程度上反映旅客群体行为的聚集和分布特征。
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引用次数: 0
Study on the shearing mechanical behavior and damage model of the polymer grouting material-concrete contact surface 高分子注浆材料-混凝土接触面剪切力学行为及损伤模型研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2657847
P. Zhao, Mingrui Du, Zhihui Chen, Xaioming Li, Yingli Wang
The polymer grouting material (PU) has been increasingly used in trenchless repair of concrete pipes and roadbeds. Investigating the mechanical behavior of the PU-concrete (P-C) contact surfaces provides a basis for further evaluating the stability of the reinforced concrete structures, which, however, has not been conducted yet. In this study, based on the shear testing results, the mechanical properties and cracking characteristics of the P-C contact surfaces were investigated, followed by establishing the damage model. Results show that the cohesion force of the P-C contact surface increases from 0.42 MPa to 1.44 MPa when the density of the PU materials increases, and there exists residual strength when normal stress is applied. The shear failure of the P-C contact surface is caused by the shearing zone, of which the thickness is about 9-10 mm. The theoretical shear stress-strain curves of the P-C contact surfaces are in good agreement with the experimental ones. The maximum relative difference between the theoretical and experimental shear strength is about 4.2%, implying that the damage model can reflect the stress-strain laws of the P-C contact surfaces under shear.
高分子灌浆材料(PU)在混凝土管道和路基的非开挖修复中得到越来越多的应用。研究pu -混凝土(P-C)接触面的力学行为为进一步评价钢筋混凝土结构的稳定性提供了基础,但目前尚未开展相关研究。本研究在剪切试验结果的基础上,研究了P-C接触面的力学性能和开裂特征,建立了损伤模型。结果表明:随着PU材料密度的增加,P-C接触面的凝聚力从0.42 MPa增加到1.44 MPa,且在法向应力作用下存在残余强度;P-C接触面的剪切破坏是由剪切带引起的,剪切带的厚度约为9-10 mm。P-C接触面的理论剪应力-应变曲线与实验结果吻合较好。理论抗剪强度与实验抗剪强度的最大相对差约为4.2%,表明该损伤模型能较好地反映P-C接触面在剪切作用下的应力-应变规律。
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引用次数: 1
Application of building information modeling technology in the design phase of municipal interchange project 建筑信息建模技术在市政立交工程设计阶段的应用
Pub Date : 2022-12-22 DOI: 10.1117/12.2657814
You Zhou, Zhoucong Xu, Jie-Ming Wu, Quanlei Wang, Haifeng Zhang, Haonan Zhou
Through the application of building information modeling (BIM) technology in the Xiaowan Interchange project, this paper reviewed the idea and the correct process of the establishment of the whole complex municipal interchange BIM model in detail, studied the technology application of earthwork adjustment, collision detection, visual distance detection and headroom detection based on BIM technology, and finally tried BIM mapping and VR display. The research shows that the application of BIM technology in the design of municipal interchange can effectively optimize the linear shape, longitudinal section, structure, and position of the intersection; and the use of the BIM model to carry out a statistical review of engineering quantities and 3D mapping can improve the quality of design documents and express the design intention with a better visualization.
本文通过建筑信息模型(BIM)技术在小湾立交项目中的应用,详细回顾了整个复杂市政立交BIM模型建立的思路和正确流程,研究了基于BIM技术的土方调整、碰撞检测、视距检测、顶空检测等技术应用,最后尝试了BIM制图和VR显示。研究表明,BIM技术在市政立交设计中的应用,可以有效优化交叉口的线形、纵断面、结构、位置;利用BIM模型对工程量进行统计评审和三维制图,可以提高设计文件的质量,更好地可视化表达设计意图。
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引用次数: 0
Research on evaluation method of architectural design based on grey clustering 基于灰色聚类的建筑设计评价方法研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2657820
Ying Xu
Under the new situation, strengthening architectural design and urban planning and design can effectively improve the effect of urban construction, promote the continuous development of the city and improve the potential value of the design scheme. It is precisely because of this factor that the current research needs to reasonably control the design scheme in combination with the current situation, so as to improve the overall effect of architectural design and effectively enhance the vitality of urban development. From the perspective of risk assessment, this study uses the grey clustering algorithm to verify the scientificity of the method. The experiment shows that the grey clustering method has a good effect on the scientific evaluation of architectural design.
在新形势下,加强建筑设计和城市规划设计,可以有效地提高城市建设效果,促进城市的持续发展,提高设计方案的潜在价值。也正是由于这一因素,当前的研究需要结合现状对设计方案进行合理的控制,从而提高建筑设计的整体效果,有效增强城市发展的活力。从风险评估的角度出发,本研究采用灰色聚类算法验证方法的科学性。实验结果表明,灰色聚类方法对建筑设计的科学评价具有良好的效果。
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引用次数: 0
Study on optimization of suburban railway operation scheme 城郊铁路运营方案优化研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2657824
Zhiying Tu, Yong Ding
The suburban railway adopts the mode of combined operation of express and local trains, which can solve the problems of uneven temporal and spatial distribution of passenger flow, meet the diversified needs of passengers, improve transportation efficiency and reduce operating costs. By analyzing and summarizing the passenger flow characteristics and transportation demand of suburban railway, aiming at minimizing the total travel time of passengers and enterprise operating cost, a nonlinear optimization model of suburban railway operation scheme is established. Considering the influence factors such as minimum tracking interval constraint and cross-sectional passenger flow constraint and completes the solution of the model by Lingo. The optimization results after running express and local trains show that the total travel time of passengers is reduced by about 97 minutes, and the enterprise operating cost is reduced by 30%, which proves that the proposed model is efficient and feasible.
城郊铁路采用快车与慢车联合运营的模式,可以解决客流时空分布不均匀的问题,满足旅客多样化的需求,提高运输效率,降低运营成本。通过分析总结城郊铁路客流特征和运输需求,以旅客总出行时间和企业运营成本最小为目标,建立了城郊铁路运营方案的非线性优化模型。考虑了最小跟踪间隔约束和横断面客流约束等影响因素,利用Lingo软件完成了模型的求解。运行特快列车和慢车后的优化结果表明,乘客的总出行时间减少了约97分钟,企业运营成本降低了30%,证明了所提模型的有效性和可行性。
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引用次数: 1
期刊
Conference on Smart Transportation and City Engineering
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