Application research for high-speed railway traffic intelligent rescheduling based on chaotic firefly algorithm

2018 ◽  
Author(s):  
Zhou Xiaozhao ◽  
Xu Wei ◽  
Zhang Qi ◽  
Wang Tao
Keyword(s):  
High Speed ◽  
Firefly Algorithm ◽  
Application Research ◽  
High Speed Railway ◽  
Railway Traffic

Research on High Speed Railway Evaluation of the Sustainable Competitive Advantage

2014 ◽  
Vol 505-506 ◽  
pp. 43-48
Author(s):  
Zhong Yang Lv ◽  
Kang Ning Zheng
Keyword(s):  
Competitive Advantage ◽  
High Speed ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Sustainable Competitive Advantage ◽  
High Speed Railway ◽  
Systematic Analysis ◽  
Railway Traffic ◽  
Positive Externality

In this paper, in order to improve the high speed railway sustainable competitive advantage as the research objective, systematic analysis of the high-speed railway to obtain sustainable competitive advantage evaluation index, including high-speed railway traffic function advantage, competitive advantage, advantage of positive externality, the Delphi method is used to scientific empowerment of these factors, by constructing fuzzy comprehensive evaluation model, the research conclusion is highway and air passenger is higher than that in high speed railway of competitive advantage

Real-Time Database System Implementation of Railway Signal Power Source Remote Monitoring

2011 ◽  
Vol 128-129 ◽  
pp. 961-964
Author(s):  
Zhi Jian Qu ◽  
Li Liu
Keyword(s):  
Power Supply ◽  
Remote Monitoring ◽  
High Speed ◽  
Low Voltage ◽  
Signal Power ◽  
High Speed Railway ◽  
Railway Traffic ◽  
Power Failure ◽  
Railway Signal ◽  
Real Time Database

Railway signal is a key technology for high-speed railway，which is the foundation to keep the high-speed train line. Railway signal power is the automatic blocking of railway lines and 10kV lines transform into 380V power through after the power supply for railway signals. Signal power as the railway traffic signal of the power supply, it belongs to the first level of power system load. Its 10kV high voltage side stik up by the major of electric, 380V low voltage side maintenance by the signal major. When the signal power failure, often occur shirk responsibilities between the different majors, in order to define the responsibilities of the accident better, which need automation remote monitoring for main railway lines of the railway signal power and scheduling control as soon as possible[1-3].

A New Monitoring Method of Wheel/Rail Contact Forces Caused by Out-of-Round Railway Wheels

2012 ◽  
Vol 178-181 ◽  
pp. 1125-1130
Author(s):  
Zhi Chen Wang ◽  
Ying Song ◽  
Ying Ming Shen
Keyword(s):  
Traffic Safety ◽  
High Speed ◽  
Test System ◽  
Simulation Software ◽  
Contact Forces ◽  
Strain Gauges ◽  
Monitoring Method ◽  
High Speed Railway ◽  
Railway Traffic ◽  
Railway Wheels

Traditional methods of wheel-rail contact forces measurement all need strain gauges on wheel sets or rails. The shortcomings of strain gauges such as zero-drift, poor anti-interference property and instability of test system can’t meat wheel/rail force test requirements in high-speed railways. A method based on PVDF piezoelectric sensing technology is presented for the test of wheel/rail contact force. Firstly, on the basis of the theory of vehicle-track coupling dynamics and by means of simulation software ADAMS/Rail, a three-dimensional train-track simulation model is established. Secondly, the modes and characteristics of wheel/rail impact vibrations due to non-roundness of railway wheels are investigated in high-speed railway operation. The relationship between the range for acceptable roundness values and vehicle speed is determined. Finally, the view that it is of important significance to establish wheel/rail force real-time monitoring system is expanded, so that abnormal conditions caused by out-of-round wheels can be detected in time, to ensure high-speed railway traffic safety. The study is very important for enhancing the stability and economy signification of rail transmission.

Wear of Titanium and Titanium Alloys Under Conditions of Rolling Stress

1978 ◽  
Vol 100 (2) ◽  
pp. 199-207 ◽  
Author(s):  
H. Krause ◽  
J. Scholten
Keyword(s):  
Titanium Alloys ◽  
Weight Reduction ◽  
High Speed ◽  
Laboratory Tests ◽  
Total Weight ◽  
Wear Behaviour ◽  
Light Weight ◽  
High Speed Railway ◽  
Railway Traffic ◽  
Positive Results

One of the most important conditions necessary for high-speed railway traffic is a clear reduction of the unsprung masses. The fact that even with light-weight wheelsets, the steel tires still constitute over 50 percent of the total weight, shows that it is here, by utilizing the lightweight materials, that the most promising possibility of weight reduction lies. For this reason, the frictional and wear behaviour of various titanium alloys was investigated and compared with that of normal steels. From the positive results, it would appear worthwhile carrying out further investigations under practical conditions as an adequate assessment cannot be obtained on the basis of the laboratory tests alone.

A Modified Davidenkov Model for Stiffness and Damping Characteristics of Saturated Clayey Soils due to Low-Amplitude Small-Strain Vibrations

2013 ◽  
Vol 680 ◽  
pp. 166-171 ◽  
Author(s):  
Peng Fei Jia ◽  
Ai Wu Yang
Keyword(s):  
High Speed ◽  
Small Strain ◽  
Clayey Soils ◽  
High Speed Railway ◽  
Railway Traffic ◽  
Damping Characteristics ◽  
Non Linear ◽  
Stiffness And Damping ◽  
Low Amplitude ◽  
Linear Softening

Railway track and nearby structures in the vicinity of high-speed railway are exposed to low-amplitude small-strain vibrations as high-speed railway traffic construction activities arise. These low-level dynamic events can lead to a non-linear softening behavior of the “elastic” stiffness and a considerable amount of energy dissipation in soils with a gradually increasing strain. The modelling of these non-linear behaviours are an important to predict lifetime and serviceability of existing structures in the vicinity of high-speed railway. An objective of this study is to develop validated computational models that can be used to perform stiffness and damping characteristics of saturated clayey soils due to low-amplitude small-strain vibrations. This paper provides an insight in the normalized shear modulus G/Gmax and damping ratio D in relation with shear strain amplitude γ through free-vibration column test, and proposes a modified Davidenkov model.

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