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WiFi performance analysis in high-speed railway communication 高速铁路通信中WiFi性能分析
High-speed Railway Pub Date : 2024-12-01 DOI: 10.1016/j.hspr.2024.11.005
Ziqi Zhang , Fengye Hu , Zhuang Ling , Cong Liu , Fengting Xu
{"title":"WiFi performance analysis in high-speed railway communication","authors":"Ziqi Zhang ,&nbsp;Fengye Hu ,&nbsp;Zhuang Ling ,&nbsp;Cong Liu ,&nbsp;Fengting Xu","doi":"10.1016/j.hspr.2024.11.005","DOIUrl":"10.1016/j.hspr.2024.11.005","url":null,"abstract":"<div><div>In High-Speed Railways (HSRs), the Train Control and Management System (TCMS) plays a crucial role. However, as the demand for train networks grows, the limitations of traditional wired connections have become apparent. This paper designs and implements a Wireless Train Communication Network (WTCN) to enhance the existing train network infrastructure. To address the challenges that wireless communication technology faces in the unique environment of high-speed rail, this study first analyzes various onboard environments and simulates several typical scenarios in the laboratory. Integrating the specific application scenarios and service characteristics of the high-speed train control network, we conduct measurements and validations of WiFi performance, exploring the specific impacts of different factors on throughput and delay.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 248-258"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-precision urban rail map construction based on multi-sensor fusion 基于多传感器融合的高精度城市轨道地图构建
High-speed Railway Pub Date : 2024-12-01 DOI: 10.1016/j.hspr.2024.11.006
Zhihong Huang , Ruipeng Gao , Zejing Xu , Yiqing Liu , Zongru Ma , Dan Tao
{"title":"High-precision urban rail map construction based on multi-sensor fusion","authors":"Zhihong Huang ,&nbsp;Ruipeng Gao ,&nbsp;Zejing Xu ,&nbsp;Yiqing Liu ,&nbsp;Zongru Ma ,&nbsp;Dan Tao","doi":"10.1016/j.hspr.2024.11.006","DOIUrl":"10.1016/j.hspr.2024.11.006","url":null,"abstract":"<div><div>The construction of high-precision urban rail maps is crucial for the safe and efficient operation of railway transportation systems. However, the repetitive features and sparse textures in urban rail environments pose challenges for map construction with high-precision. Motivated by this, this paper proposes a high-precision urban rail map construction algorithm based on multi-sensor fusion. The algorithm integrates laser radar and Inertial Measurement Unit (IMU) data to construct the geometric structure map of the urban rail. It utilizes image point-line features and color information to improve map accuracy by minimizing photometric errors and incorporating color information, thus generating high-precision maps. Experimental results on a real urban rail dataset demonstrate that the proposed algorithm achieves root mean square errors of 0.345 and 1.033 m for ground and tunnel scenes, respectively, representing a 19.31 % and 56.80 % improvement compared to state-of-the-art methods.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 265-273"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Corrigendum to: “Bearing fault diagnosis based on a multiple-constraint modal-invariant graph convolutional fusion network” [High-speed Railway 2 (2024) 92–100] “基于多约束模态不变图卷积融合网络的轴承故障诊断”的勘误[高速铁路2 (2024)92-100]
High-speed Railway Pub Date : 2024-12-01 DOI: 10.1016/j.hspr.2024.07.002
Zhongmei Wang , Pengxuan Nie , Jianhua Liu , Jing He , Haibo Wu , Pengfei Guo
{"title":"Corrigendum to: “Bearing fault diagnosis based on a multiple-constraint modal-invariant graph convolutional fusion network” [High-speed Railway 2 (2024) 92–100]","authors":"Zhongmei Wang ,&nbsp;Pengxuan Nie ,&nbsp;Jianhua Liu ,&nbsp;Jing He ,&nbsp;Haibo Wu ,&nbsp;Pengfei Guo","doi":"10.1016/j.hspr.2024.07.002","DOIUrl":"10.1016/j.hspr.2024.07.002","url":null,"abstract":"","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Page 283"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
JR East aims for driverless Shinkansen operation JR 东日本力争实现新干线无人驾驶
High-speed Railway Pub Date : 2024-09-01 DOI: 10.1016/j.hspr.2024.08.003
Yasuaki Suzuki
{"title":"JR East aims for driverless Shinkansen operation","authors":"Yasuaki Suzuki","doi":"10.1016/j.hspr.2024.08.003","DOIUrl":"10.1016/j.hspr.2024.08.003","url":null,"abstract":"<div><div>East Japan Railway Company (JR East) is aiming to “realize driverless train operation” as one of the key measures to respond to rapid changes in the business environment. Currently, Automatic Train Operation (ATO) equipment is not installed on the Shinkansen, but there are plans to introduce ATO or driverless operation in the near future. From 2018–2021, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) held the “ATO Technology Study Group for Railways” in which the concept of technical requirements necessary for driverless operation was discussed. In 2021, JR East conducted the GOA4 demonstration test on the Joetsu Shinkansen. In this test, we were able to confirm the basic functions of Shinkansen vehicles such as automatic departure control, speed control, fixed position stop control, and remote stop control using ATO. We aim to realize unattended operation (GOA4) for deadhead trains between Niigata Station and the Niigata Shinkansen Rolling Stock Center by the end of the 2020 s, and driverless operation (GOA3) for passenger trains of the Joetsu Shinkansen by the mid-2030s and continue to develop the necessary technologies and build systems.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 3","pages":"Pages 197-201"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track CRTS Ⅲ型无砟轨道温度梯度下层间动态接触关系研究
High-speed Railway Pub Date : 2024-09-01 DOI: 10.1016/j.hspr.2024.08.001
Lei Zhao , Guotang Zhao , Guotao Yang , Hao Jin , Chenxi Li
{"title":"Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track","authors":"Lei Zhao ,&nbsp;Guotang Zhao ,&nbsp;Guotao Yang ,&nbsp;Hao Jin ,&nbsp;Chenxi Li","doi":"10.1016/j.hspr.2024.08.001","DOIUrl":"10.1016/j.hspr.2024.08.001","url":null,"abstract":"<div><div>In areas with large temperature differences, the uneven distribution of temperatures in the CRTS III ballastless track slab due to daytime sunlight can cause warpage deformation, leading to periodic rail irregularities that increase the wheel-rail impact of high-speed vehicles and accelerate track structure damage. Therefore, it is necessary to study the dynamic contact relationship between the composite slab and the base plate during vehicle running. The results of the study show that: 1) Under the influence of temperature gradients, the composite slab tends to deform elliptically. With a positive temperature gradient, the middle part of the track slab bulges upward, causing the slab to be supported by its four corners. Conversely, with a negative temperature gradient, the four corners of the track slab bulge upward, resulting in the slab being supported by its center. 2) Temperature gradients can lead to separation between the composite slab and the base plate, reducing the contact area between layers. During vehicle running, the contact area between layers gradually increases, but the separation cannot be completely closed. 3) The temperature gradient significantly affects the vertical displacement of the track. The vertical displacement in the middle of the slab increases with a positive temperature gradient. In contrast, the vertical displacement at the ends of the slab increases with a negative temperature gradient. 4) The stress of self-compacting concrete at the side position significantly increases under a positive temperature gradient, with the vertical stress increasing by 2.7 times when the temperature gradient increases from 0 to 90 ℃·m<sup>−1</sup>.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 3","pages":"Pages 133-142"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Virtually coupled train set control subject to space-time separation: A distributed economic MPC approach with emergency braking configuration 受时空分离影响的虚拟耦合列车组控制：带紧急制动配置的分布式经济 MPC 方法
High-speed Railway Pub Date : 2024-09-01 DOI: 10.1016/j.hspr.2024.08.002
Xiaolin Luo , Tao Tang , Le Wang , Hongjie Liu
{"title":"Virtually coupled train set control subject to space-time separation: A distributed economic MPC approach with emergency braking configuration","authors":"Xiaolin Luo ,&nbsp;Tao Tang ,&nbsp;Le Wang ,&nbsp;Hongjie Liu","doi":"10.1016/j.hspr.2024.08.002","DOIUrl":"10.1016/j.hspr.2024.08.002","url":null,"abstract":"<div><div>The emerging virtual coupling technology aims to operate multiple train units in a Virtually Coupled Train Set (VCTS) at a minimal but safe distance. To guarantee collision avoidance, the safety distance should be calculated using the state-of-the-art space-time separation principle that separates the Emergency Braking (EB) trajectories of two successive units during the whole EB process. In this case, the minimal safety distance is usually numerically calculated without an analytic formulation. Thus, the constrained VCTS control problem is hard to address with space-time separation, which is still a gap in the existing literature. To solve this problem, we propose a Distributed Economic Model Predictive Control (DEMPC) approach with computation efficiency and theoretical guarantee. Specifically, to alleviate the computation burden, we transform implicit safety constraints into explicitly linear ones, such that the optimal control problem in DEMPC is a quadratic programming problem that can be solved efficiently. For theoretical analysis, sufficient conditions are derived to guarantee the recursive feasibility and stability of DEMPC, employing compatibility constraints, tube techniques and terminal ingredient tuning. Moreover, we extend our approach with globally optimal and distributed online EB configuration methods to shorten the minimal distance among VCTS. Finally, experimental results demonstrate the performance and advantages of the proposed approaches.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 3","pages":"Pages 143-152"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A time-space network-based model for transportation service optimization of China Railway Express 基于时空网络的中铁快运运输服务优化模型
High-speed Railway Pub Date : 2024-09-01 DOI: 10.1016/j.hspr.2024.08.005
Weichuan Yin , Wenhu Hu , Xueting Yan , Bo Peng , Xiaoling Yang
{"title":"A time-space network-based model for transportation service optimization of China Railway Express","authors":"Weichuan Yin ,&nbsp;Wenhu Hu ,&nbsp;Xueting Yan ,&nbsp;Bo Peng ,&nbsp;Xiaoling Yang","doi":"10.1016/j.hspr.2024.08.005","DOIUrl":"10.1016/j.hspr.2024.08.005","url":null,"abstract":"<div><div>This paper describes the development and optimization plans for the China Railway Express (CR Express). As a new type of international land transport organization, CR Express has emerged with the continuous expansion of China toward European investment and trade, and in particular, has expanded with the continuous progress of the One Belt and One Road (OBOR) initiative. In addition to improving the service quality of CR Express, the operating costs must be reduced for developing “smart railways” that serve “smart cities”. We propose a dual-objective-based function mathematical optimization model; the satisfaction of the cargo owner is considered, and the timeliness, transportation capacity, and goods category constraints of CR Express transportation are designed. Moreover, we present the normalized equivalent method of the two-objective function of the model. Finally, a case study is conducted against the background of certain trains in the western corridor of CR Express to validate the effectiveness of the model and research methods proposed in this study.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 3","pages":"Pages 153-163"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Generalized autoencoder-based fault detection method for traction systems with performance degradation 基于广义自动编码器的牵引系统故障检测方法 * 性能下降
High-speed Railway Pub Date : 2024-09-01 DOI: 10.1016/j.hspr.2024.06.001
{"title":"Generalized autoencoder-based fault detection method for traction systems with performance degradation","authors":"","doi":"10.1016/j.hspr.2024.06.001","DOIUrl":"10.1016/j.hspr.2024.06.001","url":null,"abstract":"<div><div>Fault diagnosis of traction systems is important for the safety operation of high-speed trains. Long-term operation of the trains will degrade the performance of systems, which decreases the fault detection accuracy. To solve this problem, this paper proposes a fault detection method developed by a Generalized Autoencoder (GAE) for systems with performance degradation. The advantage of this method is that it can accurately detect faults when the traction system of high-speed trains is affected by performance degradation. Regardless of the probability distribution, it can handle any data, and the GAE has extremely high sensitivity in anomaly detection. Finally, the effectiveness of this method is verified through the Traction Drive Control System (TDCS) platform. At different performance degradation levels, our method’s experimental results are superior to traditional methods.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 3","pages":"Pages 180-186"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141410192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Artificial-intelligent-powered safety and efficiency improvement for controlling and scheduling in integrated railway systems 以人工智能为动力，提高综合铁路系统控制和调度的安全性和效率
High-speed Railway Pub Date : 2024-09-01 DOI: 10.1016/j.hspr.2024.06.002
Jun Liu , Gehui Liu , Yu Wang , Wanqiu Zhang
{"title":"Artificial-intelligent-powered safety and efficiency improvement for controlling and scheduling in integrated railway systems","authors":"Jun Liu ,&nbsp;Gehui Liu ,&nbsp;Yu Wang ,&nbsp;Wanqiu Zhang","doi":"10.1016/j.hspr.2024.06.002","DOIUrl":"10.1016/j.hspr.2024.06.002","url":null,"abstract":"<div><div>The multi-mode integrated railway system, anchored by the high-speed railway, caters to the diverse travel requirements both within and between cities, offering safe, comfortable, punctual, and eco-friendly transportation services. With the expansion of the railway networks, enhancing the efficiency and safety of the comprehensive system has become a crucial issue in the advanced development of railway transportation. In light of the prevailing application of artificial intelligence technologies within railway systems, this study leverages large model technology characterized by robust learning capabilities, efficient associative abilities, and linkage analysis to propose an Artificial-intelligent (AI)-powered railway control and dispatching system. This system is elaborately designed with four core functions, including global optimum unattended dispatching, synergetic transportation in multiple modes, high-speed automatic control, and precise maintenance decision and execution. The deployment pathway and essential tasks of the system are further delineated, alongside the challenges and obstacles encountered. The AI-powered system promises a significant enhancement in the operational efficiency and safety of the composite railway system, ensuring a more effective alignment between transportation services and passenger demands.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 3","pages":"Pages 172-179"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-speed railway and safety: Insights from a bibliometric approach 高速铁路与安全：文献计量学方法的启示
High-speed Railway Pub Date : 2024-09-01 DOI: 10.1016/j.hspr.2024.08.004
Apostolos Anagnostopoulos
{"title":"High-speed railway and safety: Insights from a bibliometric approach","authors":"Apostolos Anagnostopoulos","doi":"10.1016/j.hspr.2024.08.004","DOIUrl":"10.1016/j.hspr.2024.08.004","url":null,"abstract":"<div><div>High-Speed Rail (HSR) systems represent a significant advancement in modern transportation. They offer rapid, efficient, and environmentally friendly alternatives to traditional rail, air travel and road transportation. Even if high-speed trains appeared approximately in the middle of the previous century, several aspects concerning safety remain. This study aims to comprehensively review the scientific literature related to the safety issues of high-speed railways. A bibliometric analysis was carried out utilizing 2358 publications from the last two decades (2004–2023) to understand better the existing research on HSR and safety. Future trends and thematic areas of research are identified and analyzed. Chinese researchers and universities have led the total number of current publications related to the context of HSR safety. While most of the publications come from Chinese institutions, a significant international collaboration can be identified. The main areas of research on HSR and safety can be classified into four main clusters based on the keywords co-occurrence analysis and are related to risk management, structural dynamics and resilience in railway systems, geotechnical engineering and tunnelling and maintenance technologies. Researchers and policymakers can use the results of this study to better understand the dynamics of scientific research in the field of high-speed railways and safety and make decisions about future directions and funding priorities.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 3","pages":"Pages 187-196"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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