High-speed Railway最新文献_第2页

Topology optimization of a ratchet compensation structure subject to periodic constraints 受周期约束的棘轮补偿结构的拓扑优化

High-speed Railway Pub Date : 2024-12-01 DOI: 10.1016/j.hspr.2024.11.003

Taining Qi , Tao Yan , Shiju Song , Yu Zhu , Geng Chen

{"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}

引用次数: 0

Dynamic response of high-speed railway vehicle and welded turnout on large-span bridges based on rigid-flexible coupling system 基于刚柔耦合系统的高速铁路车辆与焊接道岔大跨度桥梁动力响应

High-speed Railway Pub Date : 2024-12-01 DOI: 10.1016/j.hspr.2024.09.001

Xiaopei Cai , Zijie Zhong , Albert Lau , Qian Zhang , Yue Hou

{"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}

引用次数: 0

Local and global sensitivity analysis for railway upgrading between hydrogen fuel cell and electrification 铁路氢燃料电池升级与电气化的局部和全局敏感性分析

High-speed Railway Pub Date : 2024-12-01 DOI: 10.1016/j.hspr.2024.11.002

Yizhe Zhang , Zhongbei Tian , Kangrui Jiang , Stuart Hillmansen , Clive Roberts

{"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}

引用次数: 0

A miniaturized wideband high-gain end-fire antenna for 5G-R communication applications 一种用于5G-R通信应用的小型化宽带高增益端射天线

High-speed Railway Pub Date : 2024-12-01 DOI: 10.1016/j.hspr.2024.11.004

Yutong Shi , Yanliang Wu , Changhai Hu , Zheng Ma , Wen Luo

{"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}

引用次数: 0

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

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

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

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

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 , Guotang Zhao , Guotao Yang , Hao Jin , 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 , Tao Tang , Le Wang , 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