Pub Date : 2025-03-01DOI: 10.1016/j.hspr.2024.12.001
Z. Yan, Ali Zaoui, W. Sekkal
Developing the railway transport sector is a challenging scientific, economic and social research topic starting with ensuring human security. The main topic that should be developed in that sense is the ballast stability and dynamical behaviour under external loading and environmental changes. This paper investigates the effect of particle size distribution and normal pressure on the mechanical response of a ballast bed. Grading curves of ballast layers with different sizes are illustrated to discuss their strength behaviour under various strains to deduce the significant effect on the direct shear performance of the ballast layer. Direct shear tests with different Particle Size Distribution (PSD) were reproduced using the Discrete Element Method (DEM). It is noticed that when the number of small-sized ballast increases, the shear strength and the friction angle increase to varying degrees under different normal pressures, with an average increase of 27 % and 8 %, respectively. When the number of large-sized ballast decreases, the shear strength and the friction angle decrease to varying degrees under different normal pressures, with an average decrease of 6 % and 3 %, respectively.
{"title":"Influence of particle size distribution and normal pressure on railway ballast: A DEM approach","authors":"Z. Yan, Ali Zaoui, W. Sekkal","doi":"10.1016/j.hspr.2024.12.001","DOIUrl":"10.1016/j.hspr.2024.12.001","url":null,"abstract":"<div><div>Developing the railway transport sector is a challenging scientific, economic and social research topic starting with ensuring human security. The main topic that should be developed in that sense is the ballast stability and dynamical behaviour under external loading and environmental changes. This paper investigates the effect of particle size distribution and normal pressure on the mechanical response of a ballast bed. Grading curves of ballast layers with different sizes are illustrated to discuss their strength behaviour under various strains to deduce the significant effect on the direct shear performance of the ballast layer. Direct shear tests with different Particle Size Distribution (PSD) were reproduced using the Discrete Element Method (DEM). It is noticed that when the number of small-sized ballast increases, the shear strength and the friction angle increase to varying degrees under different normal pressures, with an average increase of 27 % and 8 %, respectively. When the number of large-sized ballast decreases, the shear strength and the friction angle decrease to varying degrees under different normal pressures, with an average decrease of 6 % and 3 %, respectively.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"3 1","pages":"Pages 28-36"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739354","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}
Pub Date : 2025-03-01DOI: 10.1016/j.hspr.2025.01.002
Yifan Zhuang , Fan Wang , Yuanchun Huang , Xiaomin Song , Ya Rao
Once a train stops in a tunnel section and requires emergency evacuation, the large distance between stations and long walking distances in the underground spaces of suburban railway systems pose potential risks to the evacuation process on tunnel platforms, especially in complex environments. This study utilized Virtual Reality (VR) technology to construct a virtual experimental platform for tunnel evacuation in suburban railway systems, simulating different combinations of smoke and obstacle conditions. By requiring participants to wear VR glasses and walk on an omnidirectional treadmill for moving, as well as complete psychological questionnaires, the study reveals the influences of No Guiding (NG) signs, Wall-Guided (WG) signs, and Central axis Guidance (CG) signs on the movement abilities and psychological behaviors of participants contrastively. The results show that either smoke conditions or obstacle positions affect the mental stress of participants, and the guidance sign has a positive effect on reducing the mental stress. There is an inverse relationship between mental stress and movement abilities. WG and CG signs respectively lead participants to walk closer to walls and along the central axis, which is conducive to reducing the variation in participants’ behavior characteristics when circumventing obstacles on the wall side or track side under smoke conditions, respectively. Additionally, CG signs reduce the speed fluctuations of participants before circumventing obstacles, improving the stability of the distance from the wall and speed under smoke conditions, compared to NG and WG signs. These findings contribute to understanding the evacuation psychological-behavioral-movement characteristics of pedestrians on evacuation platforms in suburban railway tunnels and provide a basis for improving the safety design of evacuation guidance signs.
{"title":"Influence of guidance signs on platform evacuation in suburban railway tunnel under smoke and obstacle environment","authors":"Yifan Zhuang , Fan Wang , Yuanchun Huang , Xiaomin Song , Ya Rao","doi":"10.1016/j.hspr.2025.01.002","DOIUrl":"10.1016/j.hspr.2025.01.002","url":null,"abstract":"<div><div>Once a train stops in a tunnel section and requires emergency evacuation, the large distance between stations and long walking distances in the underground spaces of suburban railway systems pose potential risks to the evacuation process on tunnel platforms, especially in complex environments. This study utilized Virtual Reality (VR) technology to construct a virtual experimental platform for tunnel evacuation in suburban railway systems, simulating different combinations of smoke and obstacle conditions. By requiring participants to wear VR glasses and walk on an omnidirectional treadmill for moving, as well as complete psychological questionnaires, the study reveals the influences of No Guiding (NG) signs, Wall-Guided (WG) signs, and Central axis Guidance (CG) signs on the movement abilities and psychological behaviors of participants contrastively. The results show that either smoke conditions or obstacle positions affect the mental stress of participants, and the guidance sign has a positive effect on reducing the mental stress. There is an inverse relationship between mental stress and movement abilities. WG and CG signs respectively lead participants to walk closer to walls and along the central axis, which is conducive to reducing the variation in participants’ behavior characteristics when circumventing obstacles on the wall side or track side under smoke conditions, respectively. Additionally, CG signs reduce the speed fluctuations of participants before circumventing obstacles, improving the stability of the distance from the wall and speed under smoke conditions, compared to NG and WG signs. These findings contribute to understanding the evacuation psychological-behavioral-movement characteristics of pedestrians on evacuation platforms in suburban railway tunnels and provide a basis for improving the safety design of evacuation guidance signs.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"3 1","pages":"Pages 1-16"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739352","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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.11.001
Liang Gao , Shunwei Shi , Chang Liu , Yixiong Xiao , Chunyu Wang , Yuze Wang
Tamping squeeze is essential for maintaining ballasted tracks. Previous studies have simulated squeezing behavior as a linear motion with a constant squeezing distance, which is unsuitable for various ballast beds in the field. This study aims to develop realistic formulas for squeezing behavior in tamping maintenance. First, a universal expression for the squeezing behavior of tamping operation was proposed through theoretical derivation. Subsequently, a custom testing method for squeezing distance with high accuracy was designed. Finally, the parameters of the universal expression were obtained from testing results using the response surface method and novel formulas for squeezing behavior were innovatively developed. This study can lead to greatly improved simulation accuracy and effective maintenance of tamping squeeze.
{"title":"Dynamic squeezing behavior of tamping machine in railway maintenance","authors":"Liang Gao , Shunwei Shi , Chang Liu , Yixiong Xiao , Chunyu Wang , Yuze Wang","doi":"10.1016/j.hspr.2024.11.001","DOIUrl":"10.1016/j.hspr.2024.11.001","url":null,"abstract":"<div><div>Tamping squeeze is essential for maintaining ballasted tracks. Previous studies have simulated squeezing behavior as a linear motion with a constant squeezing distance, which is unsuitable for various ballast beds in the field. This study aims to develop realistic formulas for squeezing behavior in tamping maintenance. First, a universal expression for the squeezing behavior of tamping operation was proposed through theoretical derivation. Subsequently, a custom testing method for squeezing distance with high accuracy was designed. Finally, the parameters of the universal expression were obtained from testing results using the response surface method and novel formulas for squeezing behavior were innovatively developed. This study can lead to greatly improved simulation accuracy and effective maintenance of tamping squeeze.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 241-247"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303047","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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.10.001
Mingduan Liu , Kai Liu
Amidst China's aggressive expansion of its high-speed rail network, the intersection of these lines with seismic fault zones has elevated the risk profile for high-speed rail travel. To counteract the potential dangers posed by seismic disturbances, China has introduced a comprehensive high-speed railway earthquake early-warning system. This article presents an in-depth examination of this system, encompassing aspects such as its developmental evolution, architectural design, and pivotal technologies. Furthermore, it ventures into the realm of future enhancements and developmental pathways for the system, fusing emergent findings from earthquake early warning research with advancements in artificial intelligence.
{"title":"Overview of China high-speed railway earthquake early-warning system","authors":"Mingduan Liu , Kai Liu","doi":"10.1016/j.hspr.2024.10.001","DOIUrl":"10.1016/j.hspr.2024.10.001","url":null,"abstract":"<div><div>Amidst China's aggressive expansion of its high-speed rail network, the intersection of these lines with seismic fault zones has elevated the risk profile for high-speed rail travel. To counteract the potential dangers posed by seismic disturbances, China has introduced a comprehensive high-speed railway earthquake early-warning system. This article presents an in-depth examination of this system, encompassing aspects such as its developmental evolution, architectural design, and pivotal technologies. Furthermore, it ventures into the realm of future enhancements and developmental pathways for the system, fusing emergent findings from earthquake early warning research with advancements in artificial intelligence.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 274-282"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303048","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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.11.003
Taining Qi , Tao Yan , Shiju Song , Yu Zhu , Geng Chen
The railway pantograph-catenary system employs a ratchet compensation device to sustain the tension of the contact wire. However, the excessive weight associated with the ratchet structure adversely affects the performance of the compensation device. An optimization design aimed at lightweight optimization of the ratchet wheel structure can enhance the system’s agility, improve material utilization, and reduce costs. This study uses a finite element model to establish an equivalent load model for the ratchet under service conditions and analyzes its load-bearing state. An optimization model was created and solved using ANSYS Workbench. The topological optimization configurations were compared under unconstrained conditions and four different periodic constraint scenarios. Following this, the structure was redesigned based on the topological optimization results, and a simulation analysis was conducted to compare the reconstructed model with the original model. The comparison results indicate that the masses of all four optimized models have been reduced by more than 10 %. Additionally, under conditions of a fully wound compensation rope, the maximum stress has decreased by over 20 %, leading to a more uniform stress distribution and improved overall performance. The topology optimization and redesign method based on periodic constraints offers a viable engineering solution for the lightweight design of the ratchet structure.
{"title":"Topology optimization of a ratchet compensation structure subject to periodic constraints","authors":"Taining Qi , Tao Yan , Shiju Song , Yu Zhu , Geng Chen","doi":"10.1016/j.hspr.2024.11.003","DOIUrl":"10.1016/j.hspr.2024.11.003","url":null,"abstract":"<div><div>The railway pantograph-catenary system employs a ratchet compensation device to sustain the tension of the contact wire. However, the excessive weight associated with the ratchet structure adversely affects the performance of the compensation device. An optimization design aimed at lightweight optimization of the ratchet wheel structure can enhance the system’s agility, improve material utilization, and reduce costs. This study uses a finite element model to establish an equivalent load model for the ratchet under service conditions and analyzes its load-bearing state. An optimization model was created and solved using ANSYS Workbench. The topological optimization configurations were compared under unconstrained conditions and four different periodic constraint scenarios. Following this, the structure was redesigned based on the topological optimization results, and a simulation analysis was conducted to compare the reconstructed model with the original model. The comparison results indicate that the masses of all four optimized models have been reduced by more than 10 %. Additionally, under conditions of a fully wound compensation rope, the maximum stress has decreased by over 20 %, leading to a more uniform stress distribution and improved overall performance. The topology optimization and redesign method based on periodic constraints offers a viable engineering solution for the lightweight design of the ratchet structure.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 230-240"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303043","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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.09.001
Xiaopei Cai , Zijie Zhong , Albert Lau , Qian Zhang , Yue Hou
Welded Turnout on Large-span Bridge (WTLB) is a complex multi-layer heterogeneous system and can significantly influence the service performance of High-Speed Railway (HSR). Understanding the coupling dynamic response of the vehicle and WTLB is essential. Previous research did not consider the dynamic behavior of foundations, leading to an underestimation of the vehicle-turnout-foundation coupling dynamic response, particularly when turnouts were laid on large-span bridges. This study proposes a novel modeling method that includes the foundations, to overcome the previous shortcomings by applying a rigid-flexible coupling system. In this approach, the vehicle was modeled as a rigid body sub-model in a Multi-Body Software (MBS), while WTLB was modeled as a flexible bodies sub-model using Finite Element (FE) software. The modal information from the FE model was imported into the MBS software. The two sub-models were coupled by the wheel-rail contact in the MBS environment and then the Vehicle-turnout-bridge Rigid-flexible Coupling Dynamic (VRCD) calculation model was established and it was discovered that the calculation results showed good agreement with the field test data. Through the VRCD model, the safety of the structure, the stability of the vehicle and the comfort of passengers were investigated, as well as several important infrastructure factors. The results demonstrate that this novel method provides accurate calculations and highlights the complex and significant interactions in the vehicle-turnout-bridge system.
{"title":"Dynamic response of high-speed railway vehicle and welded turnout on large-span bridges based on rigid-flexible coupling system","authors":"Xiaopei Cai , Zijie Zhong , Albert Lau , Qian Zhang , Yue Hou","doi":"10.1016/j.hspr.2024.09.001","DOIUrl":"10.1016/j.hspr.2024.09.001","url":null,"abstract":"<div><div>Welded Turnout on Large-span Bridge (WTLB) is a complex multi-layer heterogeneous system and can significantly influence the service performance of High-Speed Railway (HSR). Understanding the coupling dynamic response of the vehicle and WTLB is essential. Previous research did not consider the dynamic behavior of foundations, leading to an underestimation of the vehicle-turnout-foundation coupling dynamic response, particularly when turnouts were laid on large-span bridges. This study proposes a novel modeling method that includes the foundations, to overcome the previous shortcomings by applying a rigid-flexible coupling system. In this approach, the vehicle was modeled as a rigid body sub-model in a Multi-Body Software (MBS), while WTLB was modeled as a flexible bodies sub-model using Finite Element (FE) software. The modal information from the FE model was imported into the MBS software. The two sub-models were coupled by the wheel-rail contact in the MBS environment and then the Vehicle-turnout-bridge Rigid-flexible Coupling Dynamic (VRCD) calculation model was established and it was discovered that the calculation results showed good agreement with the field test data. Through the VRCD model, the safety of the structure, the stability of the vehicle and the comfort of passengers were investigated, as well as several important infrastructure factors. The results demonstrate that this novel method provides accurate calculations and highlights the complex and significant interactions in the vehicle-turnout-bridge system.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 203-218"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303044","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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.11.002
Yizhe Zhang , Zhongbei Tian , Kangrui Jiang , Stuart Hillmansen , Clive Roberts
In the field of rail transit, the UK Department of Transport stated that it will realize a comprehensive transformation of UK railways by 2050, abandoning traditional diesel trains and upgrading them to new environmentally friendly trains. The current mainstream upgrade methods are electrification and hydrogen fuel cells. Comprehensive upgrades are costly, and choosing the optimal upgrade method for trams and mainline railways is critical. Without a sensitivity analysis, it is difficult for us to determine the influence relationship between each parameter and cost, resulting in a waste of cost when choosing a line reconstruction method. In addition, by analyzing the sensitivity of different parameters to the cost, the primary optimization direction can be determined to reduce the cost. Global higher-order sensitivity analysis enables quantification of parameter interactions, showing non-additive effects between parameters. This paper selects the main parameters that affect the retrofit cost and analyzes the retrofit cost of the two upgrade methods in the case of trams and mainline railways through local and global sensitivity analysis methods. The results of the analysis show that, given the current UK rail system, it is more economical to choose electric trams and hydrogen mainline trains. For trams, the speed at which the train travels has the greatest impact on the final cost. Through the sensitivity analysis, this paper provides an effective data reference for the current railway upgrading and reconstruction plan and provides a theoretical basis for the next step of train parameter optimization.
{"title":"Local and global sensitivity analysis for railway upgrading between hydrogen fuel cell and electrification","authors":"Yizhe Zhang , Zhongbei Tian , Kangrui Jiang , Stuart Hillmansen , Clive Roberts","doi":"10.1016/j.hspr.2024.11.002","DOIUrl":"10.1016/j.hspr.2024.11.002","url":null,"abstract":"<div><div>In the field of rail transit, the UK Department of Transport stated that it will realize a comprehensive transformation of UK railways by 2050, abandoning traditional diesel trains and upgrading them to new environmentally friendly trains. The current mainstream upgrade methods are electrification and hydrogen fuel cells. Comprehensive upgrades are costly, and choosing the optimal upgrade method for trams and mainline railways is critical. Without a sensitivity analysis, it is difficult for us to determine the influence relationship between each parameter and cost, resulting in a waste of cost when choosing a line reconstruction method. In addition, by analyzing the sensitivity of different parameters to the cost, the primary optimization direction can be determined to reduce the cost. Global higher-order sensitivity analysis enables quantification of parameter interactions, showing non-additive effects between parameters. This paper selects the main parameters that affect the retrofit cost and analyzes the retrofit cost of the two upgrade methods in the case of trams and mainline railways through local and global sensitivity analysis methods. The results of the analysis show that, given the current UK rail system, it is more economical to choose electric trams and hydrogen mainline trains. For trams, the speed at which the train travels has the greatest impact on the final cost. Through the sensitivity analysis, this paper provides an effective data reference for the current railway upgrading and reconstruction plan and provides a theoretical basis for the next step of train parameter optimization.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 219-229"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303042","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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.11.004
Yutong Shi , Yanliang Wu , Changhai Hu , Zheng Ma , Wen Luo
This paper presents a miniaturized wideband high-gain microstrip end-fire antenna specifically designed for 5G-R communication applications. The antenna structure comprises a microstrip folded dipole resonator and end-fire directing units. By employing Intercalated Coupling Structures (ICS) between the folded dipole resonator and the ground plane, the resonant frequency of the antenna is shifted to lower frequencies, thereby significantly enhancing the operational bandwidth. Furthermore, the inclusion of three end-fire directing units positioned in front of the folded dipole oscillator substantially improves the antenna's end-fire gain. The designed antenna exhibits a relative impedance bandwidth of 46 % (ranging from 1.36 to 2.18 GHz), with a peak gain of 7.33 dBi at the 2100 MHz 5G-R frequency band. The overall dimensions of the antenna are 0.31λL × 0.39λL × 0.008λL, where λL denotes the wavelength at the lowest frequency. The proposed antenna demonstrates a broad operational bandwidth, rendering it suitable for 5G-R mobile communications.
{"title":"A miniaturized wideband high-gain end-fire antenna for 5G-R communication applications","authors":"Yutong Shi , Yanliang Wu , Changhai Hu , Zheng Ma , Wen Luo","doi":"10.1016/j.hspr.2024.11.004","DOIUrl":"10.1016/j.hspr.2024.11.004","url":null,"abstract":"<div><div>This paper presents a miniaturized wideband high-gain microstrip end-fire antenna specifically designed for 5G-R communication applications. The antenna structure comprises a microstrip folded dipole resonator and end-fire directing units. By employing Intercalated Coupling Structures (ICS) between the folded dipole resonator and the ground plane, the resonant frequency of the antenna is shifted to lower frequencies, thereby significantly enhancing the operational bandwidth. Furthermore, the inclusion of three end-fire directing units positioned in front of the folded dipole oscillator substantially improves the antenna's end-fire gain. The designed antenna exhibits a relative impedance bandwidth of 46 % (ranging from 1.36 to 2.18 GHz), with a peak gain of 7.33 dBi at the 2100 MHz 5G-R frequency band. The overall dimensions of the antenna are 0.31<em>λ</em><sub>L</sub> × 0.39<em>λ</em><sub>L</sub> × 0.008<em>λ</em><sub>L</sub>, where <em>λ</em><sub>L</sub> denotes the wavelength at the lowest frequency. The proposed antenna demonstrates a broad operational bandwidth, rendering it suitable for 5G-R mobile communications.</div></div>","PeriodicalId":100607,"journal":{"name":"High-speed Railway","volume":"2 4","pages":"Pages 259-264"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143303045","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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.11.005
Ziqi Zhang , Fengye Hu , Zhuang Ling , Cong Liu , Fengting Xu
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.
{"title":"WiFi performance analysis in high-speed railway communication","authors":"Ziqi Zhang , Fengye Hu , Zhuang Ling , Cong Liu , 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}
Pub Date : 2024-12-01DOI: 10.1016/j.hspr.2024.11.006
Zhihong Huang , Ruipeng Gao , Zejing Xu , Yiqing Liu , Zongru Ma , Dan Tao
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.
{"title":"High-precision urban rail map construction based on multi-sensor fusion","authors":"Zhihong Huang , Ruipeng Gao , Zejing Xu , Yiqing Liu , Zongru Ma , 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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号