scholarly journals Validation and Analysis on Numerical Response of Super-High-Speed Railway Pantograph-Catenary Interaction Based on Experimental Test

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jia Yang ◽  
Yang Song ◽  
Xiaobing Lu ◽  
Fuchuan Duan ◽  
Zhigang Liu ◽  
...  
Keyword(s):  
High Speed ◽  
Absolute Nodal Coordinate Formulation ◽  
Measurement Data ◽  
Numerical Results ◽  
Dynamics Model ◽  
High Speed Railway ◽  
Element Approach ◽  
Numerical Tools ◽  
Assessment Standard ◽  
Multibody Dynamics Model

The numerical tools can be used to facilitate the design of the railway pantograph-catenary system. The validation of the current numerical results is mostly performed at a speed slower than 350 km/h. This paper aims at the validation and analysis of the numerical results at a super-high-speed. The catenary model is constructed based on a nonlinear finite element approach employing the absolute nodal coordinate formulation. A multibody dynamics model is adopted to represent the pantograph. The measurement data are collected by an inspection vehicle equipped with an instrumented pantograph operating at 378 km/h in Chengdu-Chongqing high-speed line. Comparing the numerical simulation and the field test shows that the present pantograph-catenary model can provide reliable numerical results at 378 km/h. The numerical analysis of pantograph-catenary interaction at super-high-speed shows that the trailing pantograph performance does not comply with the assessment standard at 378 km/h. The adjustment of double-pantograph interval and messenger wire tension can effectively improve the trailing pantograph performance.

Study on the Evaluation Method of Subgrade Settlement Caused by Structure Layer of the High-Speed Railway

2012 ◽  
Vol 188 ◽  
pp. 72-77
Author(s):  
Ling Fa Jiang ◽  
Shu Dan Xiong ◽  
Xi Chang Xu ◽  
Shan Xiong Chen
Keyword(s):  
Numerical Calculation ◽  
High Speed ◽  
Evaluation Method ◽  
Functional Relationship ◽  
Numerical Results ◽  
Measure Data ◽  
Mechanical Parameters ◽  
High Speed Railway ◽  
Structure Layer

Based to the geometric and mechanical parameters of the typical high-speed railway, the settlement values on the foundation and the subgrade face with different structure layer load are obtained by the numerical calculation. According to these numerical results, the power functional relationship between Sst / S∞ and Pst /hγ is found, and a new evaluation method of the subgrade face settlement caused by the structure layer using the measure data is put forward. Through analyzing the settlement data of different conditions, the parameters of the formula are discussed, and some conclusions and suggestions are given. This new evaluation method will provide some reference for the design and the evaluation of the subgrade settlement caused by the structure layer of the high-speed railway.

Study on Methods of Lateral Deviation of Track for Static Inspecting in High-Speed Railway

2014 ◽  
Vol 638-640 ◽  
pp. 1195-1206
Author(s):  
Yang Teng Long Li ◽  
Min Yi Cen ◽  
Xuan Bai
Keyword(s):  
Newton’S Method ◽  
Newton's Method ◽  
High Speed ◽  
Measurement Data ◽  
Railway Track ◽  
Transition Curve ◽  
Lateral Deviation ◽  
High Speed Railway ◽  
Track Irregularity ◽  
Circular Curve

According to the critical factor of railway track geometric irregular, the deformations of track can be controlled. The lateral deviation is the key to determine the railway track irregularity. Currently, in the static inspected methods, the combined method of geodetic surveys and track surveying trolleys (inspecting instruments for static geometry parameter of track) is widely used in high-speed railway. Depending on some tests, the model of track irregularity in track surveying trolleys can be reconstructed by another method. According to the special features of track of high-speed railway, it is necessary to study on the accurate and effective lateral deviation algorithm which is suitable for the precise track inspection of high-speed railway. Based on some existing methods of construction layout in highway, the primary contents of this paper are: (1) reduces those methods to three algorithms, such as the Longitudinal Deviation Algorithm with Composite Simpson rule (LDACS), the Distance Function Algorithm of Newton’s method (DFAN) and Normal Perpendicular to Tangent Algorithm of Newton’s method (NPTAN), and (2) completes the algorithm steps of DFAN and NPTAN on circular curve, and proves the results of two algorithms on circular curve same, and (3) proposes the three algorithms to calculate lateral deviation and mileage of any rail detection points for inspecting the static geometric state of track in high-speed railway. Depending on some simulation data, the experimental results are: (1) the calculations of DFAN, NPTAN and LDACS, in which the number of subintervals of equal greater than or equal to five, meet the accuracy of the precise track detection of high-speed railway, and (2) the difference mileage and lateral deviation between DFAN and NPTAN are less than 0.001 mm, and (3) the efficiency of those algorithms is very considerable and the efficiency of DFAN is basically the same with NPTAN and higher than LDACS, and (4) the longer the transition curve is, the lower the efficiency and accuracy of DFAN and NPTAN are. The bigger the radius is, the higher the accuracy of LDACS is. According to the measurement data of the Chengdu Dujiangyan Railway Line (Cheng Guan Line), the above mentioned results of (1) and (2) can be proved correctly.

scholarly journals Analysis of Nonstationary Characteristics for High-Speed Railway Scenarios

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Tao Zhou ◽  
Cheng Tao ◽  
Kai Liu
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Markov Chain Model ◽  
Measurement Data ◽  
Channel Modeling ◽  
Death Process ◽  
Chain Model ◽  
Channel Measurements ◽  
High Speed Railway

This paper presents the analysis of nonstationary characteristics for high-speed railway (HSR) scenarios, according to passive long-term evolution- (LTE-) based channel measurements. The measurement data collected in three typical scenarios, rural, station, and suburban, are processed to obtain the channel impulse responses (CIRs). Based on the CIRs, the nonstationarity of the HSR channel is studied focusing on the stationarity interval, and a four-state Markov chain model is generated to describe the birth-death process of multipath components. The presented results will be useful in dynamic channel modeling for future HSR mobile communication systems.

scholarly journals Geometry-Based Stochastic Modeling for MIMO Channel in High-Speed Mobile Scenario

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Binghao Chen ◽  
Zhangdui Zhong
Keyword(s):  
High Speed ◽  
Measurement Data ◽  
Analytical Form ◽  
Time Correlation ◽  
Mimo Channel ◽  
Time Correlation Functions ◽  
Channel Models ◽  
High Speed Railway ◽  
Space Correlation ◽  
Channel Parameters

The geometry-based stochastic channel models are proposed in this paper for the terrain cutting, suburb, and urban scenarios in high-speed railway. First, the special scenarios in high-speed railway are described. And the channel models based on the geometry scenarios are introduced. Some channel parameters are based on measurement data. Then, the space-time correlation functions in analytical form are obtained in suburb and urban scenarios. Finally, the space correlation characteristics in three scenarios are compared.

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