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4th International Conference on Computer Engineering and Application, ICCEA 2023

作者： Han, Zheng Liu, Hanwen Xu, Shichao Song, Qing Han, Xiaofei School of Traffic and Transportation Lanzhou Jiaotong University Lanzhou730070 China Cccc Rail Transit Technology Research and Development Center Chengdu610200 China School of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou730070 China

ISBN: (纸本)9798350347548

In order to effectively implement the national strategy of building a 'transportation powerhouse', improve the operation, maintenance and management efficiency of the subway depot. This paper designs an intelligent control system for subway depots. With digital twin technology as the core, BIM technology as the support, and BIMFACE platform as the carrier, the system has built an intelligent maintenance platform for the depot. In addition, this paper proposes for the first time a digital twin six-dimensional model based on digital twin technology that integrates data processing. The platform can be deployed in three ways: web, PC, and mobile. Taking a subway depot as an example, the study demonstrates that the digital twin model can be effectively applied to the actual management of the depot and improve the operational efficiency. © 2023 IEEE.

关键词： Subways

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research and application of joint waterproofing technology for prefabricated metro station structures

Research and application of joint waterproofing technology f...

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ITA-AITES World Tunnel Congress, WTC 2024

作者： Huang, Meiqun Fan, Qi Yang, Xiuren Fang, Lin Beijing Urban Construction Design and Development Group Co. Ltd Beijing China National Engineering Research Center for Green and Safe Construction Technology in Urban Rail Transit Beijing China

ISBN: (纸本)9781032800424

The industry has placed significant emphasis on the collective waterproof performance of openexcavated prefabricated station structures. This paper examines the impact and control measures of two significant factors, namely "joint opening" and "gasket dislocation", which are closely associated with the waterproof performance of prefabricated structures. The multi-line waterproof technologies of "two gaskets + one injection + one embedding" have been thoroughly demonstrated through a combination of experimental research and monitoring results from actual engineering applications. The research and engineering application demonstrate that the waterproofing of prefabricated station structures differs from that of shield tunnels, not only in terms of waterproof structural measures, but also in various control standards. The waterproof sealing gasket, when subjected to an opening amount of 10mm and a dislocation amount of 5mm, is capable of withstanding a water pressure of 1.0MPa. This meets the performance requirements of the station structure, which is buried at a depth of 30m and needs to resist 2-3 times the water pressure. The gaskets exhibit a residual stress value of approximately 67% after a period of 100 years, indicating their ability to withstand long-term water pressure. The double sealing gaskets exhibit a modest enhancement of 20% in performance. The in performance is enhanced by 30% when performance to using a to single sealing gasket. When water leakage occurs in the outer sealing gasket of the lining, the utilization of double sealing gaskets offers notable advantages. According to the current and ongoing projects, the observed maximum joint opening for the station structure and the maximum surface displacement complies with the standards set for controlling the waterproof performance of the joint. There is no evidence of any leakage occurring at the joint, even in the absence of an external waterproof layer. © 2024 The Author(s).

关键词： Waterproofing

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research on prefabricated metro station structure and key assembly technologies

Research on prefabricated metro station structure and key as...

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ITA-AITES World Tunnel Congress, WTC 2024

作者： Yang, Xiuren Lin, Fang Beijing Urban Construction Design and Development Group co. Ltd Beijing China National Engineering Research Center for Green & Safe Construction Technology in Urban Rail Transit Beijing China

ISBN: (纸本)9781032800424

The prefabrication and assembly construction technology for metro stations provides a new industrial construction mode for urban rail transit underground stations. It not only solves the winter construction problems in severe cold areas, but also demonstrates irreplaceable advantages in terms of quality, efficiency, safety, and environmental protection. This paper is based on the research and application of this technology by the research team in Changchun, Qingdao, and Shenzhen, China since 2012. It is a brief introduction to the prefabricated metro station structure system as well as the key technical achievements in the research and application of prefabricated assembly construction technology for metro station structures in the past 10 years, mainly including joint connection technology, key technology for the design of closed-cavity thin-walled components, structural mechanical behavior and calculation method of fabricated station, structure assembly design method and key technology, joint waterproof technology, etc. It has been proved by engineering practice that the prefabrication and assembly construction technology for metro stations significantly improves engineering quality and reduces operating and maintenance costs;Greatly improve construction efficiency, save labor, and shorten construction period;Green environmental protection, emission reduction and noise reduction, sustainable development;With wide applicability, it has significant technical, economic, and social benefits. © 2024 The Author(s).

关键词： Emission control

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Exploring the Optimization of Urban Ecological Spaces from a Perspective of Ecosystem Service Functions based on Remote sensing Imagery

Exploring the Optimization of Urban Ecological Spaces from a...

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2022 International Conference on Geographic Information and Remote Sensing technology, GIRST 2022

作者： Zhao, Ziyan Fang, Hui Zhou, Haiwei Liu, Tingzhou Zhang, Wei School of Software Technology Zhejiang University Hangzhou China Ningbo Rail Transit Ningbo China Hangzhou Real Estate Development Research Center Hangzhou China

ISBN: (纸本)9781510662186

As ecological priority has become a central theme of current development, the Yangtze River Delta Eco-Green Integrated development Demonstration Zone is contributing as a guiding model to China's ecological and green integrated development. From a perspective of ecosystem service functions, in particular, geographical locations and land habitats for animals and plants, we provide an analysis of the aforementioned Demonstration Zone regarding the distribution, connectivity, and accessibility of its ecological sources, in order to select strategic zones and optimize ecological spaces, from remote sensing imagery. Our analysis was based on the evolution of the ecological base and the Sources-Resistance Surface-Corridors framework integrating local conditions and characteristics. Through navigating remote sensing images of the target area, results indicated that a considerable change occurred in the plant community in the Demonstration Zone over the recent three decades, caused by the severely damaged wetland ecosystem and the limited communications among species due to urban expansion. In addition, the study revealed poor connectivity among the ecological and geographical sources. Accordingly, we propose a set of measures to avoid landscape fragmentation, prioritize ecological protection, and improve the quality of habitats in the geographic location. © 2023 SPIE.

关键词： Demonstrations

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research on New Type Secondary Inerter Suspension Damping Devices for rail Vehicles Based on Low Frequency and High Frequency Track Excitation 3

Research on New Type Secondary Inerter Suspension Damping De...

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3rd International Conference on rail Transportation, ICRT 2024

作者： Dilai, C. Gengchen, S. Chenxu, L. Rui, S. Lixia, S. School of Railway Transportation Shanghai Institute of Technology Shanghai China China Railway Test and Certification Center Limited Beijing China Standards and Metrology Research Institute of China Academy of Railway Sciences Corporation Limited Beijing China Railway Science and Technology Research and Development Center of China Academy of Railway Sciences Corporation Limited Beijing China Wheel-Rail System Laboratory National Engineering Research Center of System Technology for High-Speed Railway and Urban Rail Transit Beijing China

ISBN: (数字)9780784485941

ISBN: (纸本)9780784485941

Different types of secondary inerter suspension vibration damping devices are established set on the Matlab platform and compare and analyzes the dynamic indicators of vehicle operation, selecting the secondary inertial suspension damping device that significantly optimizes both the quality of vehicle operation and the suppression of low-frequency and high-frequency body sway. The research results indicate that for vehicle low-frequency swaying, all four types of new dual-system inertial damping suspension devices have an optimizing effect, with Condition S5 showing the most significant improvement. Compared to the traditional suspension damping device's lateral acceleration of 1.62 m/s2, it has been optimized by 57%, achieving 0.7 m/s2. For vehicle high-frequency swaying, Condition S5 again showing the most notable improvement. Relative to the traditional suspension damping device's lateral acceleration of 0.87 m/s2, it has been optimized by 52%, reaching 0.41 m/s2. After optimizing the parameters for various conditions, the results indicate that Condition S5, with an inertial coefficient of 5,000 kg, provides the best optimization effect on the stability of the vehicle's operation. © ASCE.

关键词： Automobile suspensions

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AN EXPERIMENTAL STUDY ON THE HIGH-SPEED WHEEL-rail ADHESION CHARACTERISTICS OF BRAKING LARGE CREEP UNDER WATER CONDITION 12

AN EXPERIMENTAL STUDY ON THE HIGH-SPEED WHEEL-RAIL ADHESION ...

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12th International Conference on Contact Mechanics and Wear of rail/Wheel Systems, CM 2022

作者： Chang, Chongyi Chen, Bo Cai, Yuanwu Wang, Junbiao Railway Science and Technology Research & Development Center China Academy of Railway Sciences Corporation Limited Beijing China Wheel-Rail System Laboratory National Engineering Research Center of System Technology for High-Speed Railway andUrban Rail Transit Beijing China

ISBN: (纸本)9780646865881

With the increase of train velocity, the wheel-rail adhesion behavior will change, which will directly affect the utilization of wheel-rail adhesion during traction and braking of high-speed trains. Common rain and snow weather will cause a significant decrease in the wheel-rail adhesion coefficient. When the adhesion is insufficient, the EMU often has wheel-rail scratches and go beyond the limited braking distance, which endangers driving safety. The engineering application of brake adhesion of high-speed EMUs mainly uses the second peak of adhesion increase (the best adhesion coefficient) in the process of large creep through brake anti-skid control, but its behavior characteristics and micro-mechanism are still unclear, which restricts effective use of brake adhesion of high-speed trains. In this paper, a high-speed full-scale roller rig of wheel-rail interface is used to study the high-speed wheel-rail adhesion characteristics of large braking creep under water medium, wheel-rail adhesion characteristics of large braking creep under water condition based on the full-scale high-speed test rig is proposed, and the test of the influence law of the braking adhesion characteristics is carried out in the continuous change range of 0~30% of the longitudinal creep at the velocity of 100-400km/h under the water condition, with medium roughness level (Ra 0.4~0.6 µm) of the contact interface of the wheel and rail. The test results reveal the law of large creep adhesion characteristics of high-speed wheel-rail under water condition, and provide a theoretical basis for improving the utilization of EMU braking adhesion. © 2022 CM 2022 - 12th International Conference on Contact Mechanics and Wear of rail/Wheel Systems, Conference Proceedings. All rights reserved.

关键词： Adhesion

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research on intelligent operation and maintenance of metro depots based on digital twin technology

Research on intelligent operation and maintenance of metro d...

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International Conference on Computer Engineering and Applications (ICCEA)

作者： Zheng Han Hanwen Liu Shichao Xu Qing Song Xiaofei Han School of Traffic and Transportation Lanzhou Jiaotong University Lanzhou China CCCC Rail Transit Technology Research and Development Center Chengdu China School of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou China

In order to effectively implement the national strategy of building a “transportation powerhouse”, improve the operation, maintenance and management efficiency of the subway depot. This paper designs an intelligent control system for subway depots. With digital twin technology as the core, BIM technology as the support, and BIMFACE platform as the carrier, the system has built an intelligent maintenance platform for the depot. In addition, this paper proposes for the first time a digital twin six-dimensional model based on digital twin technology that integrates data processing. The platform can be deployed in three ways: web, PC, and mobile. Taking a subway depot as an example, the study demonstrates that the digital twin model can be effectively applied to the actual management of the depot and improve the operational efficiency.

关键词：

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Performance of the suspension method in large cross-section shallow-buried tunnels

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High-Speed railway 2023年第4期1卷 224-232页

作者： Guoqing Cai Xinxiang Zou Qiang Zhang Rui Yang Tianchi Wu Jiguang Li Key Laboratory of Urban Underground Engineering of Ministry of Education Beijing Jiaotong UniversityBeijing 100044China School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China China Communications(Nanjing)Construction Co. Ltd.Nanjing 210000China CCCC Rail Transit Technology Research and Development Center Beijing 101304China School of Engineering Cardiff UniversityCardiCF243AAUnited Kingdom Fujian Academy of Building Research Co. Ltd.Fuzhou 350025China

Large cross-section tunnel construction induces ground surface settlements, potentially endangering both subterranean projects and nearby above-ground structures. A novel tunnel construction method, known as the suspension method,is introduced in this paper to mitigate surface settlement. The suspension method employs vertical tie rods to establish a structural connection between the initial tunnel support system and the surface steel beam, thereby exerting effective control settlements. To analyze the performance of the proposed method, systematic numerical simulations were conducted based on the practical engineering of Harbin Subway Line 3. The surface settlement and vault settlement characteristics during construction are investigated. The results show a gradual increment in both surface and vault settlement throughout the construction process, culminating in a stabilized state upon the completion of *** addition, compared to the double-side drift method and the Cross Diaphragm Method(CRD) method, the suspension method can obviously reduce the surface settlement and vault settlement. Moreover, the surface settlements and the axial force of tie rods were continuously monitored during the construction process at the trial tunnel *** specific monitoring measurements are illustrated in comparison to numerical analysis results. The monitored results show great agreement with the numerical predictions, confirming the success of the project. This research can serve as a valuable practical reference for similar projects, offering insights and guidance for addressing ground surface settlements and enhancing construction safety in the domain of large cross-section tunneling.

关键词： Subway tunnel construction Suspension method Settlement control Numerical analysis On-site monitoring

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高雷诺数下覆羽控制直翼型流动分离的位置影响实验

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Acta Mechanica Sinica 2024年第4期40卷 125-135页

作者：巩绪安马兴宇姜楠 Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin300354China National Key Laboratory of Aerodynamic Noise Control China Aerodynamics Research and Development CenterSichuan621000China National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of AeronauticsNorthwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu610031China

本文在二维机翼上安装了仿生的覆羽结构,在5.0×105的雷诺数下研究它们控制前缘流动分离的效果.覆羽是指覆盖在鸟类翅膀上的多排短而柔软的带有锯齿状尖端的羽毛.它们覆盖在长而硬的飞羽边缘,使鸟的翅膀保持流线型.当流动分离发生时... 详细信息

本文在二维机翼上安装了仿生的覆羽结构,在5.0×105的雷诺数下研究它们控制前缘流动分离的效果.覆羽是指覆盖在鸟类翅膀上的多排短而柔软的带有锯齿状尖端的羽毛.它们覆盖在长而硬的飞羽边缘,使鸟的翅膀保持流线型.当流动分离发生时,这些柔性锯齿形的人工覆羽在来流的激励下能够自适应地变形和颤振.在风洞实验中,本文使用高时间分辨率的粒子图像测速仪(PIV)来测量机翼上表面的速度场,并使用热线风速仪来测量尾流中的高频湍流脉动.安装在20%弦长处的人工覆羽在前缘分离流的激励下会自适应地大幅翻转.安装在80%弦长处的覆羽则会被尾缘卷起的脱落涡向上抬起,并在准平衡状态下轻微摆动.这两类人工覆羽均能够有效地控制流动分离,并减小尾流的湍流脉动强度.

关键词：流动分离风洞实验分离流湍流脉动高时间分辨率热线风速仪高雷诺数锯齿形

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Wheel wear comparison between motor car and trailer of intercity train

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Journal of Central South University 2021年第6期28卷 1737-1746页

作者： KOU Jie ZHANG Ji-min ZHOU He-chao WANG Cheng-ping SUN Li-xia Institute of Rail Transit Tongji UniversityShanghai 201804China Railway Science Technology Research and Development Center China Academy of Railway Science Cooperation LimitedBeijing 100081China

To analyze wheel wear discrepancy between motor car and trailer of an intercity train,a novel wheel wear rates calculation model was proposed,which was composed of the intercity train dynamics model,wheel-rail three-dimensional rolling contact FEM model and the wear *** simulated results were contrasted with measured results in field *** simulated results showed the motor car wheels had larger rotation rate and longitudinal creepage than the trailer ***,the motor car wheels encountered larger vertical forces and longitudinal forces from bogie because of the heavier car body and the impact of traction *** traction torque acting on motor car wheel could increase the slip rates in the rear part of wheel contact patch and weaken the spinning phenomenon of relative *** contact pressure and slip rates caused the higher wear rates of motor car wheel than those of trailer *** overall trends of wheel wear depth in simulated and tested results were *** they both showed the motor car wheel encountered the more serious wear than the trailer *** models can be used to study the effect of the traction characteristics curves on the wear of wheel.

关键词： wheel wear intercity train motor car and trailer finite element method(FEM) field test

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