Brake Distance Calculation of CRH

2013 ◽  
Vol 380-384 ◽  
pp. 201-204 ◽  
Author(s):  
Xu Peng ◽  
Ying Ying Zhou ◽  
Qian Yong Li ◽  
Xiao Qiong He
Keyword(s):  
Traditional Method ◽  
High Speed ◽  
Real Data ◽  
High Speed Train ◽  
Railway Transportation ◽  
High Speed Railway ◽  
Distance Calculation ◽  
Braking Distance ◽  
Real Value ◽  
Existing Data

With the development of high-speed railway in China, CRH is widely used in railway transportation. Traditional method of braking distance calculation is not suitable for CRH. In this paper, a more accurate brake distance of CRH locomotive has been calculated by using the calculus form of the kinematics formulas and verified by real data. Compared with existing data, the authenticity of this calculation is notable. The result is of real value for the researches about high speed train and it makes the control of CRH more accurate.

scholarly journals Models and Algorithms of Conflict Detection and Scheduling Optimization for High-Speed Train Operations Based on MPC

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Zhihui Wang ◽  
Yonghua Zhou ◽  
Deng Liu
Keyword(s):  
Predictive Control ◽  
Traffic Control ◽  
High Speed ◽  
Conflict Detection ◽  
High Speed Train ◽  
Railway Transportation ◽  
Scheduling Optimization ◽  
High Speed Railway ◽  
Prediction Horizon

The high-speed train with high transport speed and punctuality rate has become a leading tool of daily traveling. Compared with the general-speed railway transportation, the high-speed railway transportation requires a timely and automatic adjustment capability in the centralized traffic control (CTC) system. In order to improve the capability, this paper mainly explores the models and algorithms of conflict detection and scheduling optimization of high-speed train operations. They are implemented under the mechanism of model predictive control (MPC) over the rolling prediction horizon. A train movement prediction model with conflict resolution is established. The mechanism of conflict detection and scheduling optimization is implemented through a case study. The simulation results demonstrate the effectiveness of the proposed mechanism.

scholarly journals High Speed Train Rescheduling Based on an Improved Triangle Differential Algorithm

2016 ◽  
Vol 3 (1) ◽  
pp. 15
Author(s):  
Wenjing Deng
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Real Data ◽  
High Speed Train ◽  
Font Size ◽  
Total Delay ◽  
High Speed Railway ◽  
Train Rescheduling ◽  
High Speed Trains ◽  
Differential Algorithm

<p style="margin: 0cm 0cm 0pt; line-height: 150%;"><span style="font-family: Times New Roman;"><span style="line-height: 150%; font-size: 12pt; mso-bidi-font-family: 'Times New Roman';" lang="EN-US">To reduce the total delay time of the high speed trains and produce high quality timetable, this paper establishes a model of the train rescheduling of high-speed railway, describing the related concepts of high speed train rescheduling with matrices. It takes the track number, operation intervals, train dwelling time at stations as constraints, the sum delayed time at all the stations as the operation goal to construct the model of train rescheduling on high speed railway. Based on the analysis of differential strategy of difference algorithm of, it proposes the differential algorithm for high speed</span><span style="line-height: 150%; font-size: 12pt; mso-bidi-font-family: 'Times New Roman';" lang="EN-US">train rescheduling based on triangle differential strategy and presents the steps of the algorithm. It proves the model effectiveness and the high efficiency and precision of the algorithm with the real data from Beijing-Guangzhou high speed railway. The method for the high speed train rescheduling based on the differential strategy presented in this paper is reasonable and feasible.</span></span></p>

scholarly journals Monitoring and Modeling Railway Structures on High-Speed Lines with Asphalt Concrete Underlay: A Study on the Bretagne–Pays de la Loire Line

2020 ◽  
Vol 2674 (12) ◽  
pp. 600-607
Author(s):  
Diana Khairallah ◽  
Olivier Chupin ◽  
Juliette Blanc ◽  
Pierre Hornych ◽  
Jean-Michel Piau ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
High Speed ◽  
Large Scale ◽  
Strain Gages ◽  
Railway Transportation ◽  
Dynamic Stresses ◽  
High Speed Railway ◽  
High Frequencies ◽  
High Acceleration ◽  
High Speed Trains

The design and durability of high-speed railway lines is a major challenge in the field of railway transportation. In France, 40 years of feedback on the field behavior of ballasted tracks led to improvements in the design rules. However, the settlement and wear of ballast, caused by dynamic stresses at high frequencies, remains a major problem on high-speed tracks leading to high maintenance costs. Studies have shown that this settlement is linked to the high acceleration produced in the ballast layer by high-speed trains traveling on the track, disrupting the granular assembly. The “Bretagne–Pays de la Loire” high-speed line (BPL HSL), with its varied subgrade conditions, represents the first large-scale application of asphalt concrete (GB) as the ballast sublayer. This line includes 77 km of conventional track with a granular sublayer of unbound granular material (UGM) and 105 km of track with an asphalt concrete sublayer under the ballast. During construction, instruments such as accelerometers, anchored deflection sensors, and strain gages, among others, were installed on four sections of the track. This paper examines the instrumentation as well as the acquisition system installed on the track. The data processing is explained first, followed by a presentation of the ViscoRail software, developed for modeling railway tracks. The bituminous section’s behavior and response is modeled using a multilayer dynamic response model, implemented in the ViscoRail software. A good match between experimental and calculated results is highlighted.

scholarly journals Characteristics of airflow in the platform with high-speed train passing through the underground railway station

2020 ◽  
Vol 165 ◽  
pp. 04075
Author(s):  
Qizhang Li ◽  
Yongliang Xie
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
High Speed Train ◽  
Air Velocity ◽  
Railway Station ◽  
High Speed Railway ◽  
Air Conditioning System ◽  
Environment Control ◽  
Underground Railway ◽  
Waiting Line

Underground high-speed railway station is becoming more and more popular in recent years, due to its advantage in relieving the tense situation of urban construction land. HVAC (Heating, Ventilation and Air Conditioning) system of underground railway station consumes large energy, therefore it is necessary to find a way to decrease the energy consumption in stations. Reasonable ventilation and air organization are the basis of energy-saving design of environment control system in stations. The energy consumption could be reduced greatly by utilizing the piston wind properly. In the present work, airflow characteristics in the station are investigated when high-speed train is passing through the underground railway station with CCM+ software. Results show that piston wind has different effects on airflow in the platform when the high-speed train is running. However, the air velocity in the platform is always lower than 5 m/s. In order to analyse the effect of piston wind on the airflow in the platform in more detail, the velocities and temperatures at waiting line are extracted. The air velocity near two ends of platform is larger and the similar results could also be observed for temperatures.

scholarly journals Optimizing Train-Set Circulation Plan in High-Speed Railway Networks Using Genetic Algorithm

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Yun Wang ◽  
Yu Zhou ◽  
Xuedong Yan
Keyword(s):  
Genetic Algorithm ◽  
High Speed ◽  
Sustainable Transportation ◽  
Utilization Efficiency ◽  
Practical Significance ◽  
Railway Transportation ◽  
High Speed Railway ◽  
Utilization Scheme ◽  
The One ◽  
New Research

As a sustainable transportation mode, high-speed railway (HSR) has been developing rapidly during the past decade in China. With the formation of dense HSR network, how to improve the utilization efficiency of train-sets (the carrying tools of HSR) has been a new research hotspot. Moreover, the emergence of railway transportation hubs has brought great challenges to the traditional train-sets’ utilization mode. Thus, in this paper, we address the issue of train-sets’ utilization problem with the consideration of railway transportation hubs, which consists of finding an optimal Train-set Circulation Plan (TCP) to complete trip tasks in a given Train Diagram (TD). An integer programming TCP model is established to optimize the train-set utilization scheme, aiming to obtain the one-to-one correspondence relationship among sets of train-sets, trip tasks, and maintenances. A genetic algorithm (GA) is designed to solve the model. A case study based on Nanjing and Shanghai HSR transportation hubs is made to demonstrate the practical significance of the proposed method. The results show that a more efficient TCP can be formulated by introducing train-sets being dispatched among different stations in the same hub.

Analysis on Dynamic Transfer Characteristics of Low Geosynthetic-Reinforced Embankments Supported by CFG Piles Subjected to High-Speed Railway

2011 ◽  
Vol 368-373 ◽  
pp. 2575-2580 ◽  
Author(s):  
Long Long Fu ◽  
Quan Mei Gong ◽  
Yang Wang
Keyword(s):  
Field Test ◽  
High Speed ◽  
Dynamic Stress ◽  
Numerical Study ◽  
High Stress ◽  
High Speed Train ◽  
High Speed Railway ◽  
Railway Line ◽  
Transfer Characteristics ◽  
Reinforced Embankments

To investigate the dynamic transfer characteristics of low geosynthetic-reinforced embankments supported by CFG piles under high-speed train load, a numerical study has been conducted through dynamic finite element method on basis of the dynamic field test on a cross-section of Beijing-Shanghai high-speed railway. The comparative analysis on results of numerical study and field test indicated the distribution characteristics of vertical dynamic stress induced by high-speed train load in subgrade soil under railway line. The numerical results also suggested a high stress area in subgrade where vertical dynamic stress is over 1kPa. Conclusions of this work can provide reference for both design and estimation of long-term settlement of low geosynthetic-reinforced embankments supported by CFG piles for high-speed railway.

The Vibration Response Analysis about High-Speed Train’s Braking Wing

2012 ◽  
Vol 226-228 ◽  
pp. 102-105
Author(s):  
Wen Qing Zhu ◽  
Yang Yong Zhu
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Rapid Development ◽  
Response Analysis ◽  
High Speed Train ◽  
High Speed Railway ◽  
Emergency Braking ◽  
Finite Element Software ◽  
High Speed Trains ◽  
Aerodynamic Brake

With the rapid development of high-speed railway in China, the aerodynamic brake is very likely to be an important emergency braking mode of high-speed train in the future. This paper takes aerodynamic braking wing as the object, and uses the finite element software to divide the meshes, then analyses the model influenced by static stress. After simulating the vibratory frequency response of the model in the flow field, it finds that the largest deformation happens in the middle of the upper edge of the wind wing, when the wind speed gets to 500km/h and the load frequency to 4Hz. Some conclusions of this thesis can provide reference for researching the applying the aerodynamic brake in the high-speed trains and laying the foundation for solving the riding and braking safety problems.

scholarly journals An Empirical Study on the Comprehensive Optimization Method of a Train Diagram of the China High Speed Railway Express

2019 ◽  
Vol 11 (7) ◽  
pp. 2141
Author(s):  
Xueqiao Yu ◽  
Maoxiang Lang ◽  
Wenhui Zhang ◽  
Shiqi Li ◽  
Mingyue Zhang ◽  
...  
Keyword(s):  
Sustainable Development ◽  
High Speed ◽  
Railway Transportation ◽  
Railway Network ◽  
High Speed Rail ◽  
High Speed Railway ◽  
Logistics Industry ◽  
The Sustainable Development ◽  
Express Train ◽  
Multiple Units

The rapid and stable development of China’s economy has driven the increasing demand for express transportation. Based on network operation, China Railway Corporation of High-speed Railway launched high-speed rail products, which have attracted wide attention from all walks of life. With the application of high-speed express trains, the market structure of express transportation in China will change dramatically, from highways as the main mode of transportation to high-speed railway transportation relying on a high-speed railway network, which will effectively reduce the environmental pollution caused by express transportation and further improve the sustainable development of the economy and the logistics industry. At present, the freight Electric Multiple Units (EMU) has been successfully developed and has entered the final test stage. In the last paper, we have introduced the theory and method of the high-speed rail express train operation plan. In addition, a train diagram is an important foundation of railway transportation organization. In order to ensure the sustainable development of high-speed rail express trains after they are put into use, based on the operation plan of high-speed rail express trains, this paper establishes a comprehensive compilation model of a high-speed rail express train diagram, considering train running time, freight flow distribution scheme, and the operation plan of freight multiple units, and an exact solution algorithm based on the Lagrange relaxation algorithm is designed. The computational results are encouraging and demonstrate the effectiveness of the model and solution method.

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