Railway Engineering Science最新文献_第3页

Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads 下卧垫道床细观力学动态特性分析

1区工程技术

Railway Engineering Science Pub Date : 2023-10-25 DOI: 10.1007/s40534-023-00319-z

Xiong Yang, Liuyang Yu, Xuejun Wang, Zhigang Xu, Yu Deng, Houxu Li

{"title":"Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads","authors":"Xiong Yang, Liuyang Yu, Xuejun Wang, Zhigang Xu, Yu Deng, Houxu Li","doi":"10.1007/s40534-023-00319-z","DOIUrl":"https://doi.org/10.1007/s40534-023-00319-z","url":null,"abstract":"Abstract The meso-dynamical behaviour of a high-speed rail ballast bed with under sleeper pads (USPs) was studied. The geometrically irregular refined discrete element model of the ballast particles was constructed using 3D scanning techniques, and the 3D dynamic model of the rail–sleeper–ballast bed was constructed using the coupled discrete element method–multi-flexible-body dynamics (DEM–MFBD) approach. We analyse the meso-mechanical dynamics of the ballast bed with USPs under dynamic load on a train and verify the correctness of the model in laboratory tests. It is shown that the deformation of the USPs increases the contact area between the sleeper and the ballast particles, and subsequently the number of contacts between them. As the depth of the granular ballast bed increases, the contact area becomes larger, and the contact force between the ballast particles gradually decreases. Under the action of the elastic USPs, the contact forces between ballast particles are reduced and the overall vibration level of the ballast bed can be reduced. The settlement of the granular ballast bed occurs mainly at the shallow position of the sleeper bottom, and the installation of the elastic USPs can be effective in reducing the stress on the ballast particles and the settlement of the ballast bed.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"75 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134974251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modelling dynamic pantograph loads with combined numerical analysis 结合数值分析的动态受电弓载荷建模

1区工程技术

Railway Engineering Science Pub Date : 2023-10-13 DOI: 10.1007/s40534-023-00318-0

F. F. Jackson, R. Mishra, J. M. Rebelo, J. Santos, P. Antunes, J. Pombo, H. Magalhães, L. Wills, M. Askill

{"title":"Modelling dynamic pantograph loads with combined numerical analysis","authors":"F. F. Jackson, R. Mishra, J. M. Rebelo, J. Santos, P. Antunes, J. Pombo, H. Magalhães, L. Wills, M. Askill","doi":"10.1007/s40534-023-00318-0","DOIUrl":"https://doi.org/10.1007/s40534-023-00318-0","url":null,"abstract":"Abstract Appropriate interaction between pantograph and catenary is imperative for smooth operation of electric trains. Changing heights of overhead lines to accommodate level crossings, overbridges, and tunnels pose significant challenges in maintaining consistent current collection performance as the pantograph aerodynamic profile, and thus aerodynamic load changes significantly with operational height. This research aims to analyse the global flow characteristics and aerodynamic forces acting on individual components of an HSX pantograph operating in different configurations and orientations, such that the results can be combined with multibody simulations to obtain accurate dynamic insight into contact forces. Specifically, computational fluid dynamics simulations are used to investigate the pantograph component loads in a representative setting, such as that of the recessed cavity on a Class 800 train. From an aerodynamic perspective, this study indicates that the total drag force acting on non-fixed components of the pantograph is larger for the knuckle-leading orientation rather than the knuckle-trailing, although the difference between the two is found to reduce with increasing pantograph extension. Combining the aerodynamic loads acting on individual components with multibody tools allows for realistic dynamic insight into the pantograph behaviour. The results obtained show how considering aerodynamic forces enhance the realism of the models, leading to behaviour of the pantograph–catenary contact forces closely matching that seen in experimental tests.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135855530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stability analysis of loose accumulation slopes under rainfall: case study of a high-speed railway in Southwest China 降雨作用下松散堆积边坡稳定性分析——以西南某高速铁路为例

1区工程技术

Railway Engineering Science Pub Date : 2023-09-12 DOI: 10.1007/s40534-023-00317-1

Xin Wang, Qian Su, Zongyu Zhang, Feihu Huang, Chenfang He

{"title":"Stability analysis of loose accumulation slopes under rainfall: case study of a high-speed railway in Southwest China","authors":"Xin Wang, Qian Su, Zongyu Zhang, Feihu Huang, Chenfang He","doi":"10.1007/s40534-023-00317-1","DOIUrl":"https://doi.org/10.1007/s40534-023-00317-1","url":null,"abstract":"Abstract The high and steep slopes along a high-speed railway in the mountainous area of Southwest China are mostly composed of loose accumulations of debris with large internal pores and poor stability, which can easily induce adverse geological disasters under rainfall conditions. To ensure the smooth construction of the high-speed railway and the subsequent safe operation, it is necessary to master the stability evolution process of the loose accumulation slope under rainfall. This article simulates rainfall using the finite element analysis software’s hydromechanical coupling module. The slope stability under various rainfall situations is calculated and analysed based on the strength reduction method. To validate the simulation results, a field monitoring system is established to study the deformation characteristics of the slope under rainfall. The results show that rainfall duration is the key factor affecting slope stability. Given a constant amount of rainfall, the stability of the slope decreases with increasing duration of rainfall. Moreover, when the amount and duration of rainfall are constant, continuous rainfall has a greater impact on slope stability than intermittent rainfall. The setting of the field retaining structures has a significant role in improving slope stability. The field monitoring data show that the slope is in the initial deformation stage and has good stability, which verifies the rationality of the numerical simulation method. The research results can provide some references for understanding the influence of rainfall on the stability of loose accumulation slopes along high-speed railways and establishing a monitoring system.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135826190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of railway wheel tread damage on wheel–rail impact loads and the durability of wheelsets 铁路车轮踏面损伤对轮轨冲击载荷和轮对耐久性的影响

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-08-16 DOI: 10.1007/s40534-023-00316-2

Michele Maglio, T. Vernersson, J. Nielsen, A. Ekberg, E. Kabo

引用次数: 1

Numerical analysis of high-speed railway slab tracks using calibrated and validated 3D time-domain modelling 使用校准和验证的三维时域模型对高速铁路板式轨道进行数值分析

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-08-04 DOI: 10.1007/s40534-023-00315-3

A. Esen, O. Laghrouche, P. Woodward, D. Medina-Pineda, Q. Corbisez, J. Shih, D. Connolly

引用次数: 0

Influence of train speed and its mitigation measures in the short- and long-term performance of a ballastless transition zone 列车速度及其缓解措施对无砟过渡区短期和长期性能的影响

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-07-17 DOI: 10.1007/s40534-023-00314-4

A. Ramos, R. Calçada, A. Correia

引用次数: 0

Train post-derailment behaviours and containment methods: a review 培训脱轨后的行为和遏制方法:回顾

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-07-14 DOI: 10.1007/s40534-023-00313-5

Zhao Tang, Yuwei Hu, Shuangbu Wang, Liang Ling, Jianjun Zhang, Kaiyun Wang

引用次数: 2

A strategy for lightweight designing of a railway vehicle car body including composite material and dynamic structural optimization 基于复合材料和动态结构优化的铁道车辆车体轻量化设计策略

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-07-03 DOI: 10.1007/s40534-023-00312-6

A. Cascino, E. Meli, A. Rindi

引用次数: 0

Temperature field test and prediction using a GA-BP neural network for CRTS II slab tracks 基于GA-BP神经网络的CRTS II平板轨道温度场测试与预测

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-07-03 DOI: 10.1007/s40534-023-00309-1

Dan Liu, Chengguang Su, Rong-shan Yang, J. Ren, Xue-yi Liu

引用次数: 0

Dynamic train dwell time forecasting: a hybrid approach to address the influence of passenger flow fluctuations 动态列车停留时间预测：一种解决客流波动影响的混合方法

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2023-06-07 DOI: 10.1007/s40534-023-00311-7

Zishuai Pang, Liwen Wang, Shengjie Wang, Li Li, Q. Peng

引用次数: 0