期刊文献+
共找到11篇文章
< 1 >
每页显示 20 50 100
Research on the strain gauge mounting scheme of track wheel force measurement system based on high-speed wheel/rail relationship test rig
1
作者 Yuanwu Cai Bo Chen Chongyi Chang 《Railway Sciences》 2024年第4期503-513,共11页
Purpose-This paper aims to analyze the stress and strain distribution on the track wheel web surface and study the optimal strain gauge location for force measurement system of the track wheel.Design/methodology/appro... Purpose-This paper aims to analyze the stress and strain distribution on the track wheel web surface and study the optimal strain gauge location for force measurement system of the track wheel.Design/methodology/approach-Finite element method was employed to analyze the stress and strain distribution on the track wheel web surface under varying wheel-rail forces.Locations with minimal coupling interference between vertical and lateral forces were identified as suitable for strain gauge installation.Findings-The results show that due to the track wheel web’s unique curved shape and wheel-rail force loading mechanism,both tensile and compressive states exit on the surface of the web.When vertical force is applied,Mises stress and strain are relatively high near the inner radius of 710 mm and the outer radius of 1110mmof the web.Under lateral force,high Mises stress and strain are observed near the radius of 670mmon the inner and outer sides of the web.As the wheel-rail force application point shifts laterally toward the outer side,the Mises stress and strain near the inner radius of 710 mm of the web gradually decrease under vertical force while gradually increasing near the outer radius of 1110 mm of the web.Under lateral force,the Mises stress and strain on the surface of the web remain relatively unchanged regardless of the wheel-rail force application point.Based on the analysis of stress and strain on the surface of the web under different wheel-rail forces,the inner radius of 870 mm is recommended as the optimal mounting location of strain gauges for measuring vertical force,while the inner radius of 1143 mm is suitable for measuring lateral force.Originality/value-The research findings provide valuable insights for determining optimal strain gauge locations and designing an effective track wheel force measurement system. 展开更多
关键词 track wheel high-speed wheel/rail relationship test rig Instrumented wheelset Strain gauge Finite element
下载PDF
Beam-track interaction of high-speed railway bridge with ballast track 被引量:18
2
作者 闫斌 戴公连 张华平 《Journal of Central South University》 SCIE EI CAS 2012年第5期1447-1453,共7页
Based on the construction bridge of Xiamen-Shenzhen high-speed railway(9-32 m simply-supported beam + 6×32 m continuous beam),the pier-beam-track finite element model,where the continuous beam of the ballast trac... Based on the construction bridge of Xiamen-Shenzhen high-speed railway(9-32 m simply-supported beam + 6×32 m continuous beam),the pier-beam-track finite element model,where the continuous beam of the ballast track and simply-supported beam are combined with each other,was established.The laws of the track stress,the pier longitudinal stress and the beam-track relative displacement were analyzed.The results show that reducing the longitudinal resistance can effectively reduce the track stress and the pier stress of the continuous beam,and increase the beam-track relative displacement.Increasing the rigid pier stiffness of continuous beam can reduce the track braking stress,increase the pier longitudinal stress and reduce the beam-track relative displacement,Increasing the rigid pier stiffness of simply-supported beam can reduce the track braking stress,the rigid pier longitudinal stress and the beam-track relative displacement. 展开更多
关键词 high-speed railway beam-track interaction ballast track rail longitudinal force continuous beam
下载PDF
Dynamic responses of bridge-approach embankment transition section of high-speed rail 被引量:2
3
作者 杨长卫 孙海玲 +2 位作者 张建经 朱传彬 颜利平 《Journal of Central South University》 SCIE EI CAS 2013年第10期2830-2839,共10页
Based on the vehicle track coupling dynamics theory, a new spatial dynamic numerical model of vehicle track subgrade coupling system was established considering the interaction among different structural layers in the... Based on the vehicle track coupling dynamics theory, a new spatial dynamic numerical model of vehicle track subgrade coupling system was established considering the interaction among different structural layers in the subgrade system. The dynamic responses of the coupled system were analyzed when the speed of train was 350 km/h and the transition was filled with graded broken stones mixed with 5% cement. The results indicate that the setting form of bridge-approach embankment section has little effect on the dynamic responses, thus designers can choose it on account of the practical circumstances. Because the location about 5 m from the bridge abutment has the greatest deformation, the stiffness within 0 5 m zone behind the abutment should be specially designed. The results of the study from vehicle track dynamics show that the maximum allowable track deflection angle should be 0.09% and the coefficient of subgrade reaction(K30) is greater than 190 MPa within the 0 5 m zone behind the abutment and greater than 150 MPa in other zones. 展开更多
关键词 high-speed rail bridge-approach EMBANKMENT section numerical model track DEFLECTION angle
下载PDF
Multi-point Contact of the High-speed Vehicle-turnout System Dynamics 被引量:5
4
作者 REN Zunsong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第3期518-525,共8页
The wheel-rail contact problems, such as the number, location and the track of contact patches, are very important for optimizing the spatial structure of the rails and lowering the vehicle-turnout system dynamics. Ho... The wheel-rail contact problems, such as the number, location and the track of contact patches, are very important for optimizing the spatial structure of the rails and lowering the vehicle-turnout system dynamics. However, the above problems are not well solved currently because of having the difficulties in how to determine the multi-contact, to preciously present the changeable profiles of the rails and to establish an accurate spatial turnout system dynamics model. Based on a high-speed vehicle-turnout coupled model in which the track is modeled as flexible with rails and sleepers represented by beams, the line tracing extreme point method is introduced to investigate the wheel-rail multiple contact conditions and the key sections of the blade rail, longer nose rail, shorter rail in the switch and nose rail area are discretized to represent the varying profiles of rails in the turnout. The dynamic interaction between the vehicle and turnout is simulated for cases of the vehicle divergently passing the turnout and the multi-point contact is obtained. The tracks of the contact patches on the top of the rails are presented and the wheel-rail impact forces are offered in comparison with the contact patches transference on the rails. The numerical simulation results indicate that the length of two-point contact occurrence of a worn wheel profile and rails is longer than that of the new wheel profile and rails; The two-point contact definitely occurs in the switch and crossing area. Generally, three-point contact doesn’t occur for the new rail profile, which is testified by the wheel-rails interpolation distance and the first order derivative function of the tracing line extreme points. The presented research is not only helpful to optimize the structure of the turnout, but also useful to lower the dynamics of the high speed vehicle-turnout system. 展开更多
关键词 line tracing extreme point method multi-point contact high-speed vehicle-turnout system track of contact point on rails wheel-rail force transference
下载PDF
Minimum Curve Radii for High-Speed Trains, Including the Gyroscopic Moments of the Wheels
5
作者 Ronald L. Huston 《World Journal of Engineering and Technology》 2017年第1期113-124,共12页
This paper studies the title problem including an analysis of the gyroscopic effects of the wheels of a rail-car travelling at high-speed around a level, horizontal curve. The analysis is based upon the fundamental pr... This paper studies the title problem including an analysis of the gyroscopic effects of the wheels of a rail-car travelling at high-speed around a level, horizontal curve. The analysis is based upon the fundamental principles of dynamics. The result is a design formula for the minimum curve radius needed to prevent derailment. Aside from the rail car geometric and physical properties, the minimum curve radius depends upon the square the train speed. An illustrative example shows that the wheel gyroscopic effect is destabilizing and additive to the centrifugal force derailment tendency. From a track design perspective, however, the gyroscopic effect is relatively small compared with the centrifugal force effect. 展开更多
关键词 high-speed TRAIN rail track Design WHEEL Gyroscopic MOMENTS
下载PDF
Dynamic analysis of a high-speed train operating on a curved track with failed fasteners 被引量:19
6
作者 Li ZHOU Zhi-yun SHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2013年第6期447-458,共12页
A high-speed train-track coupling dynamic model is used to investigate the dynamic behavior of a high-speed train operating on a curved track with failed fasteners. The model considers a high-speed train consisting of... A high-speed train-track coupling dynamic model is used to investigate the dynamic behavior of a high-speed train operating on a curved track with failed fasteners. The model considers a high-speed train consisting of eight vehicles coupled with a ballasted track. The vehicle is modeled as a multi-body system, and the rail is modeled with a Timoshenko beam resting on the discrete sleepers. The vehicle model considers the effect of the end connections of the neighboring vehicles on the dynamic behavior. The track model takes into account the lateral, vertical, and torsional deformations of the rails and the effect of the discrete sleeper support on the coupling dynamics of the vehicles and the track. The sleepers are assumed to move backward at a constant speed to simulate the vehicle running along the track at the same speed. The train model couples with the track model by using a Hertzian contact model for the wheel/rail normal force calculation, and the nonlinear creep theory by Shen et al. (1984) is used for wheel/rail tangent force calculation. In the analysis, a curved track of 7000-m radius with failed fasteners is selected, and the effects of train operational speed and the number of failed fasteners on the dynamic behaviors of the train and the track are investigated in detail. Furthermore, the wheel/rail forces and derailment coefficient and the wheelset loading reduction are analyzed when the high-speed train passes over the curved track with the different number of continuously failed fasteners at different operational speeds. Through the detailed numerical analysis, it is found that the high-speed train can operate normally on the curved track of 7000-m radius at the speeds of 200 km/h to 350 km/h. 展开更多
关键词 high-speed train Ballast track Failed fastener Wheel/rail force Derailment coefficient Wheelset loading reduction
原文传递
基于Kalmam滤波和Kalman-RTS平滑的高铁轨道平顺性数据融合算法
7
作者 郭锦萍 白征东 辛浩浩 《测绘工程》 2023年第2期7-12,共6页
针对传统轨道平顺性测量方法存在的依赖于CPⅢ控制网、维护成本高、测量技术效率低等问题,文中基于高铁轨道平顺性测量系统,采用Kalman滤波和Kalman-RTS平滑算法对包括GNSS接收机、里程计、IMU在内的多种传感器的数据进行融合处理。实... 针对传统轨道平顺性测量方法存在的依赖于CPⅢ控制网、维护成本高、测量技术效率低等问题,文中基于高铁轨道平顺性测量系统,采用Kalman滤波和Kalman-RTS平滑算法对包括GNSS接收机、里程计、IMU在内的多种传感器的数据进行融合处理。实验表明,多传感器数据先通过Kalman滤波处理后,轨道测量绝对坐标横向偏差均值从纯GNSS的4.7 mm降低至2.2 mm,精度提升幅度达53.2%;再进行Kalman-RTS平滑处理后,绝对坐标横向偏差均值再度降低到1.6 mm,总的精度提升幅度达66.3%,相对坐标横向偏差均值精度提升幅度达10.1%,可以有效提升轨道测量作业效率。 展开更多
关键词 工程测量 高铁轨道平顺性 KALMAN滤波 Kalman-RTS平滑
下载PDF
槽型轨磨耗演变过程数值模拟 被引量:12
8
作者 杨阳 李芾 +1 位作者 张茂松 丁军君 《铁道科学与工程学报》 CAS CSCD 北大核心 2016年第8期1607-1612,共6页
为研究槽型轨磨耗规律,采用多体动力学分析软件UM,基于Specht磨耗模型及轮轨多点接触理论以我国自主研发的70%低地板有轨电车为例,建立59R2槽型轨磨耗计算模型,分析槽型轨在缓和曲线、圆曲线、直线地段的磨耗情况。计算结果表明:圆曲线... 为研究槽型轨磨耗规律,采用多体动力学分析软件UM,基于Specht磨耗模型及轮轨多点接触理论以我国自主研发的70%低地板有轨电车为例,建立59R2槽型轨磨耗计算模型,分析槽型轨在缓和曲线、圆曲线、直线地段的磨耗情况。计算结果表明:圆曲线外侧轨道的磨耗主要集中在轨肩处;当列车通过次数较少时内侧轨道磨耗主要集中在轨头及轨肩处,随着列车通过次数增加磨耗量变大,轨槽磨耗量与轨头及轨肩的磨耗量基本相当;缓和曲线轨道的磨耗量远小于圆曲线上轨道的磨耗量,外轨磨耗集中于轨肩处,内轨集中在轨头及轨肩处;在直线地段上,左右侧轨道的磨耗情况基本相似,磨耗量远小于圆曲线和缓和曲线。 展开更多
关键词 槽型轨 有轨电车 钢轨磨耗规律 多点接触理论 数值模拟
下载PDF
基于轨道局部波动的高速铁路轨道平顺状态评估方法 被引量:11
9
作者 陈嵘 李帅 +2 位作者 王源 王平 陈俊文 《铁道学报》 EI CAS CSCD 北大核心 2017年第2期105-111,共7页
高平顺、高稳定、高可靠是高速铁路基础结构必须具备的基本属性,对轨道平顺状态进行全面准确评价是保证轨道高平顺性的根本前提。针对我国现行轨道不平顺评价方法中存在的不足,定义一种用于描述局部波动的多尺度标准差卷积变换模型,并... 高平顺、高稳定、高可靠是高速铁路基础结构必须具备的基本属性,对轨道平顺状态进行全面准确评价是保证轨道高平顺性的根本前提。针对我国现行轨道不平顺评价方法中存在的不足,定义一种用于描述局部波动的多尺度标准差卷积变换模型,并借助脉冲函数分析该模型的基本特性。结合某高速铁路动检数据,分析该模型对轨道平顺性的评估效果,基于最大熵原理确定最优局部管理区段长度为15m,并提出轨道局部波动指数概念。实例分析表明,轨道局部波动指数反映了局部波动与轨道平顺状态的内在关联,能够对轨道局部波动进行准确定位,可以为轨道养护维修方案的制定提供新依据。 展开更多
关键词 高速铁路 轨道平顺状态 养护维修 轨道局部波动指数 最大熵原理
下载PDF
客货共线无砟轨道平顺状态预测模型 被引量:3
10
作者 马帅 高亮 +1 位作者 刘秀波 蔡小培 《中国铁道科学》 EI CAS CSCD 北大核心 2019年第3期24-31,共8页
客货共线无砟轨道的轨道质量指数(TQI)具有随时间长期缓慢变化并伴随平稳波动的特点,而现有的预测模型难以预测这种变化。基于小波和时间序列分析预测方法,提出ARMA-BP神经网络和ARMA-SVR预测模型。通过小波分析将TQI时间序列分解为高... 客货共线无砟轨道的轨道质量指数(TQI)具有随时间长期缓慢变化并伴随平稳波动的特点,而现有的预测模型难以预测这种变化。基于小波和时间序列分析预测方法,提出ARMA-BP神经网络和ARMA-SVR预测模型。通过小波分析将TQI时间序列分解为高频和低频2个部分,采用ARMA模型对高频部分建模,分别采用BP神经网络和支持向量回归SVR模型对低频部分建模,最后对高频和低频进行综合预测。此方法可根据具体情况对具有不同特性的TQI时间序列进行针对性建模,提高预测精度。运用此方法对包西线和太中线10个无砟轨道区段TQI时间序列进行预测,结果表明:ARMA-BP神经网络与ARMA-SVR的建模精度平均值分别为98.1%和98.5%,后验差分别为0.31和0.21,均达到1级;前者对已知数据的拟合精度高,而后者对未知数据预测能力较强、泛化能力更突出。 展开更多
关键词 客货共线 无砟轨道 平顺状态 预测模型 轨道质量指数 支持向量回归(SVR) BP神经网络 小波分解
下载PDF
滑橇高速运动动态效应与滑轨平顺度的关系研究 被引量:8
11
作者 张立乾 邓宗才 +1 位作者 郭富民 闫晶 《弹道学报》 EI CSCD 北大核心 2011年第2期106-110,共5页
运用有限元理论建立了火箭滑橇高速滑轨系统的橇轨耦合动态分析模型,计算了不同轨道平顺度条件下橇轨动态效应,得到了橇车在轨道上运行姿态的变化规律,分析了轨道平顺度对橇轨动态效应的影响.研究表明:橇车在轨道上运行时产生偏航摆动... 运用有限元理论建立了火箭滑橇高速滑轨系统的橇轨耦合动态分析模型,计算了不同轨道平顺度条件下橇轨动态效应,得到了橇车在轨道上运行姿态的变化规律,分析了轨道平顺度对橇轨动态效应的影响.研究表明:橇车在轨道上运行时产生偏航摆动、升降、俯仰和绕橇车质心滚转;随着轨道偏差的增大,橇车平均冲击加速度和平均冲击力近似呈线性增长;轨道平顺度对橇轨耦合动态效应影响很大,轨道平顺度是高速滑轨设计重点考虑的问题之一. 展开更多
关键词 滑橇 滑轨 橇轨 橇车 运行姿态 平顺度 冲击 动态效应
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部