检索结果-南通市图书馆

On the Polygonal Wear Evolution of Heavy-Haul Locomotive Wheels due to Wheel/Rail Flexibility and Its Mitigation Measures

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical engineering 2024年第1期37卷 40-61页

作者： Yunfan Yang Feifan Chai Pengfei Liu Liang Ling Kaiyun Wang wanming zhai State Key Laboratory of Mechanical Behavior and System Safety of Traffic engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu 610031China

Wheel polygonal wear can immensely worsen wheel/rail interactions and vibration performances of the train and track,and ultimately,lead to the shortening of service life of railway *** present,wheel/rail medium-or high-frequency frictional interactions are perceived as an essential reason of the high-order polygonal wear of railway wheels,which are potentially resulted by the flexible deformations of the train/track system or other external *** this work,the effect of wheel/rail flexibility on polygonal wear evolution of heavy-haul locomotive wheels is explored with aid of the long-term wheel polygonal wear evolution simulations,in which different flexible modeling of the heavy-haul wheel/rail coupled system is ***,the mitigation measures for the polygonal wear of heavy-haul locomotive wheels are *** results point out that the evolution of polygonal wear of heavy-haul locomotive wheels can be veritably simulated with consideration of the flexible effect of both wheelset and *** of mixed-line operation of heavy-haul trains and application of multicut wheel re-profiling can effectively reduce the development of wheel polygonal *** research can provide a deep-going understanding of polygonal wear evolution mechanism of heavy-haul locomotive wheels and its mitigation measures.

关键词： Heavy-haul locomotive Wheel polygonal wear Wheel/rail flexibility Long-term polygonal wear evolution Mitigation measures

Integration of bio-inspired limb-like structure damping into motor suspension of high-speed trains to enhance bogie hunting stability

在线全文

学校读者我要写书评

暂无评论

Railway engineering Science 2024年第3期32卷 324-343页

作者： Heng Zhang Liang Ling Sebastian Stichel wanming zhai State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu 610031China Department of engineering Mechanics KTH Royal Institute of TechnologyStockholmSweden

Hunting stability is an important performance criterion in railway *** study proposes an incorporation of a bio-inspired limb-like structure(LLS)-based nonlinear damping into the motor suspension system for traction units to improve the nonlinear critical speed and hunting stability of high-speed trains(HSTs).Initially,a vibration transmission analysis is conducted on a HST vehicle and a metro vehicle that suffered from hunting motion to explore the effect of different motor suspension systems from on-track ***,a simplified lateral dynamics model of an HST bogie is established to investigate the influence of the motor suspension on the bogie hunting *** bifurcation analysis is applied to optimize the motor suspension parameters for high critical ***,the nonlinear damping of the bio-inspired LLS,which has a positive correlation with the relative displacement,can further improve the modal damping of hunting motion and nonlinear critical speed compared with the linear motor suspension ***,a comprehensive numerical model of a high-speed train,considering all nonlinearities,is established to investigate the influence of different types of motor *** simulation results are well consistent with the theoretical *** benefits of employing nonlinear damping of the bio-inspired LLS into the motor suspension of HSTs to enhance bogie hunting stability are thoroughly validated.

关键词： High-speed train Hunting stability Bio-inspired limb-like structure Motor suspension Nonlinear damping

梁缝冲击对悬挂式单轨车桥系统动力特性的影响研究

在线全文

学校读者我要写书评

暂无评论

铁道标准设计 2024年第9期68卷 60-67,103页

作者：王洛何庆烈杨昀蔡成标翟婉明西南交通大学牵引动力国家重点实验室成都610031

悬挂式单轨轨道梁梁端客观存在局部梁缝不平顺,列车通过时会产生较大的轮轨动力冲击,对车辆和桥梁的动力学性能均有重要影响。为探明梁缝冲击对悬挂式单轨车辆与轨道梁桥系统动力特性的影响,基于车辆-桥梁动力相互作用理论,建立悬挂式... 详细信息

悬挂式单轨轨道梁梁端客观存在局部梁缝不平顺,列车通过时会产生较大的轮轨动力冲击,对车辆和桥梁的动力学性能均有重要影响。为探明梁缝冲击对悬挂式单轨车辆与轨道梁桥系统动力特性的影响,基于车辆-桥梁动力相互作用理论,建立悬挂式单轨车-桥耦合动力学模型,在此基础上以实测梁缝不平顺作为外部激励,研究梁缝冲击作用下车桥系统耦合振动特性及车辆系统关键参数的影响。研究结果表明:梁缝冲击会显著增大悬挂式单轨车桥系统动力响应幅值,其中车体、构架及轮轨力的响应在5 Hz以上增长显著,轨道梁振动加剧主要集中在40 Hz以上;随着梁缝不平顺幅值增大,系统垂向振动响应均呈现非线性规律增加,尤其是驱动轮轮轨力,为保障驱动轮使用安全,建议梁缝不平顺幅值不超过6 mm;为有效控制梁缝冲击对系统动力性能的影响,车辆二系悬挂垂向刚度、阻尼及驱动轮径向刚度的合理取值分别为0.1 MN/m、16 kN·s/m和4 MN/m。

关键词：悬挂式单轨车-桥耦合振动梁缝冲击动力性能参数影响

同方期刊数据库

Full-scale multi-functional test platform for investigating mechanical performance of track–subgrade systems of high-speed railways

在线全文

学校读者我要写书评

暂无评论

Railway engineering Science 2020年第3期28卷 213-231页

作者： wanming zhai Kaiyun Wang Zhaowei Chen Shengyang Zhu chengbiao cai Gang Liu Train and Track Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China MOE Key Laboratory of High-speed Railway engineering Southwest Jiaotong UniversityChengdu 610031China

Motivated by the huge practical engineering demand for the fundamental understanding of mechanical characteristics of high-speed railway infrastructure,a fullscale multi-functional test platform for high-speed railway track–subgrade system is developed in this paper,and its main functions for investigating the mechanical performance of track–subgrade systems are elaborated with three typical experimental *** the full-scale subgrade structure and all the five types of track structures adopted in Chinese high-speed railways,namely the CRTS I,the CRTS II and the CRTS III ballastless tracks,the double-block ballastless track and the ballasted track,the test platform is established strictly according to the construction standard of Chinese high-speed *** kinds of effective loading methods are employed,including the real bogie loading,multi-point loading and the impact *** types of sensors are adopted in different components of the five types of track–subgrade systems to measure the displacement,acceleration,pressure,structural strain and deformation,*** this test platform,both dynamic characteristics and long-term performance evolution of high-speed railway track–subgrade systems can be investigated,being able to satisfy the actual demand for large-scale operation of Chinese high-speed *** examples,three typical experimental studies are presented to elucidate the comprehensive functionalities of the full-scale multi-functional test platform for exploring the dynamic performance and its long-term evolution of ballastless track systems and for studying the long-term accumulative settlement of the ballasted track–subgrade system in high-speed *** interesting phenomena and meaningful results are captured by the developed test platform,which provide a useful guidance for the scientific operation and maintenance of high-speed railway infrastructure.

关键词： Full-scale test High-speed railway Track–subgrade system Ballastless track Ballasted track Mechanical performance Long-term performance evolution Damage and degradation

高速列车—轨道—桥梁动态相互作用原理及模型

在线全文

学校读者我要写书评

暂无评论

土木工程学报 2005年第11期38卷 132-137页

作者：翟婉明蔡成标王开云西南交通大学西南交通大学四川成都610031

分析了高速列车通过桥梁过程中机车车辆与轨道结构及桥梁之间的动态相互作用机制;在此基础上建立了高速列车—轨道—桥梁动态相互作用模型;以秦沈客运专线高速行车试验为基础对模型进行了验证分析,结果表明:模型计算结果与现场实测结果... 详细信息

分析了高速列车通过桥梁过程中机车车辆与轨道结构及桥梁之间的动态相互作用机制;在此基础上建立了高速列车—轨道—桥梁动态相互作用模型;以秦沈客运专线高速行车试验为基础对模型进行了验证分析,结果表明:模型计算结果与现场实测结果具有较好的一致性,由此说明在高速列车/桥梁振动分析中充分考虑轨道结构参振并引入精确的动态轮轨作用关系,可以更好地模拟高速列车过桥动态行为。

关键词：高速列车桥梁动态相互作用振动模型

车辆-轨道垂向系统的统一模型及其耦合动力学原理

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

铁道学报 1992年第3期14卷 10-21页

作者：翟婉明西南交通大学

本文应用系统工程的方法,首次将铁道车辆系统与轨道系统作为一个总体大系统加以考察,建立了车辆-轨道垂向统一模型,提出了车辆-轨道耦合动力学理论。统一模型为集总-分布参数混合模型,其中车辆表示成10自由度多刚体系统模型,轨道描述成... 详细信息

本文应用系统工程的方法,首次将铁道车辆系统与轨道系统作为一个总体大系统加以考察,建立了车辆-轨道垂向统一模型,提出了车辆-轨道耦合动力学理论。统一模型为集总-分布参数混合模型,其中车辆表示成10自由度多刚体系统模型,轨道描述成3层连续弹性点支承无限长Eu1er梁模型,轮轨耦合关系采用Hertz非线性弹性接触理论。文章介绍了垂向耦合动力学的快速数值分析方法,并应用数值试验方法研究了数值积分稳定性、钢轨模态收敛性及轨道有效计算长度。通过将理论模拟结果与国内外主要大型试验测量结果进行对照,验证了车辆-轨道垂向统一模型的正确性。

关键词：铁道车辆轨道垂向振动轮轨作用

Prediction of high-speed train induced ground vibration based on train-track-ground system model

在线全文

学校读者我要写书评

暂无评论

Earthquake engineering and engineering Vibration 2010年第4期9卷 545-554页

作者： zhai wanming He Zhenxing Song Xiaolin Train and Track Research Institute Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China

The development of analysis on train-induced ground vibration is briefly summarized. A train-track- ground integrated dynamic model is introduced in the paper to predict the ground vibration induced by high-speed trains. Representative dynamic responses of the train-track-ground system predicted by the model are presented. Some major results measured from two field tests on the ground vibration induced by two high-speed trains are reported. Numerical prediction with the proposed train-track-ground model is validated by the high-speed train running experiments. Research results show that the wheel/rail dynamic interaction caused by track irregularities has a significant influence on the ground acceleration and little influence on the ground displacement. The main frequencies of the ground vibration induced by high-speed trains are usually below 80 Hz. Compared with the ballasted track, the ballastless track structure can produce much larger train-induced ground vibration at frequencies above 40 Hz. The vertical ground vibration is much larger than the lateral and longitudinal components.

关键词： high-speed railway ground vibration dynamic model simulation field experiment

Preface to special issue on plenary presentations of Second International Conference on Rail Transportation

在线全文

学校读者我要写书评

暂无评论

Railway engineering Science 2022年第3期30卷 263-264页

作者： wanming zhai southwest jiaotong university Chengdu 610031China

The Second International Conference on Rail Transportation(ICRT),initiated and hosted by southwest jiaotong university,completed its agenda after two days of academic reports and seminars,and came to a successful end on 6 July 2021,in chengdu,*** conference chairman was Professor wanming zhai from southwest jiaotong *** conference received tremendous support from multiple co-sponsors including National Natural Science Foundation of china,Transportation&Development Institute of ASCE,National Innovation Center of High Speed Train of china,university of Illinois at Urbana-Champaign,Tongji university,Delft university of Technology,china academy of Railway sciences,Royal Institute of Technology(KTH),Central South university,Politecnico di Milano,Central Queensland university,Beijing jiaotong university and university of Technology Sydney.

关键词： Sydney initiated southwest

Vehicle–track–tunnel dynamic interaction:a finite/infinite element modelling method

在线全文

学校读者我要写书评

暂无评论

Railway engineering Science 2021年第2期29卷 109-126页

作者： Lei Xu wanming zhai School of Civil engineering Department of Railway EngineeringCentral South UniversityChangsha410075China Train and Track Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu610031China

The aim of this study is to develop coupled matrix formulations to characterize the dynamic interaction between the vehicle,track,and *** vehicle–track coupled system is established in light of vehicle–track coupled dynamics *** physical characteristics and mechanical behavior of tunnel segments and rings are modeled by the finite element method,while the soil layers of the vehicle–track–tunnel(VTT)system are modeled as an assemblage of 3-D mapping infinite elements by satisfying the boundary conditions at the infinite *** novelty,the tunnel components,such as rings and segments,have been coupled to the vehicle–track systems using a matrix coupling method for finite *** responses of sub-systems included in the VTT interaction are obtained simultaneously to guarantee the solution *** relieve the computer storage and save the CPU time for the large-scale VTT dynamics system with high degrees of freedoms,a cyclic calculation method is *** from model validations,the necessity of considering the tunnel substructures such as rings and segments is *** addition,the maximum number of elements in the tunnel segment is confirmed by numerical simulations.

关键词： Vehicle-track-tunnel interaction Railway tunnel Finite elements Infinite elements Dynamic modelling