Installation position determination of wind speed sensors on steel pole along a high-speed railway

2016 ◽  
Vol 23 (11) ◽  
pp. 3018-3027 ◽  
Author(s):  
Xiao-hui Xiong ◽  
Xi-feng Liang
Keyword(s):  
Wind Speed ◽  
High Speed ◽  
High Speed Railway ◽  
Position Determination

Determination of Cell Coverage Area and its Applications in High-Speed Railway Environments

2017 ◽  
Vol 66 (5) ◽  
pp. 3515-3525 ◽  
Author(s):  
Bo Ai ◽  
Ruisi He ◽  
Guangkai Li ◽  
Ke Guan ◽  
Danping He ◽  
...  
Keyword(s):  
High Speed ◽  
Coverage Area ◽  
High Speed Railway ◽  
Cell Coverage

scholarly journals Determination of the optimal curvature of the turnout diverging track for HSR using dynamic analysis

2017 ◽  
Vol 2017 (10) ◽  
pp. 1-11
Author(s):  
Władysław Koc ◽  
Katarzyna Palikowska
Keyword(s):  
Dynamic Analysis ◽  
Analytical Method ◽  
High Speed ◽  
Extreme Points ◽  
Point Of View ◽  
High Speed Railway ◽  
Zero Values ◽  
Linear And Nonlinear ◽  
Selection Of

The paper presents an analytical method of identifying the curvature of the turnout diverging track consisting of sections of varying curvature. Such turnout is mainly applied on High Speed Railway. Both linear and nonlinear (polynomial) curvatures of the turnout diverging track are considered in the paper. Obtained solutions enable to assume curvature values at the beginning and end point of the geometrical layout of the turnout.The paper focus on a fundamental and unexplained so far issue connected with selection of the most favourable curvature section from the operational requirements point of view. In order to determine the optimal curvature a dynamic analysis has been carried out on the several representative cases. It has been indicated that, used in railway practice, clothoid sections with nonzero curvatures at the beginning and end points of the turnout should be verified. It has been proved that the turnout with nonlinear curvature reaching zero values at the extreme points of the geometrical layout is the most favourable.

A Self-Attention Based Method for Wind Speed Forecasting in High-Speed Railway System

2021 ◽  
Author(s):  
Chen Liu ◽  
Jiming Chen ◽  
Haoyu Liu ◽  
Haodong Jiang ◽  
Shibo He
Keyword(s):  
Wind Speed ◽  
High Speed ◽  
High Speed Railway ◽  
Wind Speed Forecasting ◽  
Railway System

Determination of the Minimum Departure Interval between Trains with same High-Speed at the Relatively Initial Station

2014 ◽  
Vol 587-589 ◽  
pp. 1737-1740
Author(s):  
Jing Jing Shao ◽  
Lei Shan Zhou ◽  
Zi Xi Bai ◽  
Yong Feng Shang
Keyword(s):  
High Speed ◽  
Operational Efficiency ◽  
High Density ◽  
Sufficient Condition ◽  
Necessary And Sufficient Condition ◽  
Research Focus ◽  
High Speed Railway ◽  
High Speed Trains ◽  
Necessary And Sufficient

Chinese high-speed railway is in a boom and making train diagram with high-density trains to relieve capacity intense and improve operational efficiency has become the research focus. Different kinds of station intervals between adjacent trains are the basis for the train diagram. According to the situation in which trains with different speed run on the same line and the proportion of high-speed trains is much larger than that of middle-speed trains, this paper raises principles and methods to determine the minimum departure interval between trains with same speed at the relatively initial station. The minimum departure interval between trains with same speed at the relatively initial station is a necessary and sufficient condition for making train diagram since there is no overtaking between same-speed trains.

scholarly journals Experimental and Numerical Investigation on Ballast Flight from Perspective of Individual Particles

2019 ◽  
Vol 10 (1) ◽  
pp. 286
Author(s):  
Hao Yin ◽  
Liang Gao
Keyword(s):  
Wind Speed ◽  
High Speed ◽  
Air Pressure ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Safe Operation ◽  
High Speed Railway ◽  
Large Size ◽  
Flow Field Characteristics ◽  
Individual Particles

Ballast flight significantly affects the safe operation of high-speed railway. A wind tunnel experiment and computational fluid dynamics simulation were performed to investigate the occurrence and development mechanism of ballast flight from the perspective of individual particles, which was based on the capture, reconstruction, and analysis approach of ballast features. The dynamic characteristics of ballast particles under wind load, the flow field characteristics such as the distribution of air pressure and streamline, and the influence of the ballast mass and shape, windward direction, and wind speed on the ballast flight were investigated. The results show that the critical velocity of the ballast weighing from 5 g to 200 g is between 14.22 m/s and 29.89 m/s. The massive ballast with the shape of an oblate is unlikely to fly. The air pressure difference is proportional to the square of the wind speed, and it increases 14.9 times when the wind speed increases from 10 m/s to 40 m/s. In order to avoid ballast flight, recommended suggestions include limiting the proportions of the small and the ellipsoid ballast praticles, laying the ballast with high density and a large size on the top of the ballast bed, and reducing the degradation and fouling of the ballast bed.

scholarly journals Numerical analysis on the time-varying temperature field distribution patterns of ballastless track steel-concrete composite box girders at ambient temperature based on field measurements

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Wangqing Wen ◽  
Shiwei Li ◽  
Aiguo Yan ◽  
Jiahua Zeng
Keyword(s):  
Temperature Field ◽  
Wind Speed ◽  
Ambient Temperature ◽  
High Speed ◽  
Time Varying ◽  
Temperature Field Distribution ◽  
Box Girders ◽  
High Speed Railway ◽  
Ballastless Track ◽  
Main Girder

AbstractTo analyze the time-varying temperature field distribution pattern of ballastless track steel-concrete composite box girders for a high-speed railway at ambient temperature, a numerical model for analyzing the time-varying temperature field of steel-concrete composite box girders was established based on the long-term monitoring data for the internal and external environments of the main girder of the Ganjiang Bridge on the Nanchang-Ganzhou high-speed railway. The influence of factors such as the deck pavement and the ambient wind speed on the time-varying temperature field of the steel-concrete composite box girders were considered. The results showed that there was a significant difference in the vertical temperature gradient patterns on sections at the side web and at the middle web at the same moment in time due to the hindering effect of the track board on the heat exchange between the ambient temperature and the main girder. Increasing the wind speed accelerated the rate of heat exchange between the main girder surface and the environment. In particular, when the internal temperature of the girder was higher than the ambient temperature, the higher the wind speed was, the larger the temperature gradient was. This study lays a foundation for accurate analysis of the structural response of ballastless track steel-concrete composite girder bridges at ambient temperature.

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