scholarly journals Investigation into rail corrugation in high-speed railway tracks from the viewpoint of the frictional self-excited vibration of a wheel–rail system

2016 ◽  
Vol 24 (2) ◽  
pp. 124-131 ◽  
Author(s):  
G. X. Chen ◽  
X. L. Cui ◽  
W. J. Qian
Keyword(s):  
High Speed ◽  
High Speed Railway ◽  
Rail Corrugation ◽  
Railway Tracks ◽  
Rail System ◽  
Excited Vibration

scholarly journals Analysis of influence factors of rail corrugation in small radius curve track

2021 ◽  
Vol 12 (1) ◽  
pp. 31-40
Author(s):  
Zhiqiang Wang ◽  
Zhenyu Lei
Keyword(s):  
Influence Factors ◽  
Small Radius ◽  
Track Structure ◽  
Complex Eigenvalue ◽  
Three Dimensional Model ◽  
Rail Corrugation ◽  
Finite Element Software ◽  
Rail System ◽  
Side Rail ◽  
Excited Vibration

Abstract. In order to effectively prevent and control the generation and development of rail corrugation, according to the actual line condition of the small radius curve section, the vehicle (with flexible wheel sets)–track space coupled model was established by using the multi-body dynamic software UM (Universal Mechanism), which could consider the coupled relationship in three directions of space, and the dynamic analysis for the corrugation section was carried out by using the model. Then, based on the theory of friction self-excited vibration, the three-dimensional model of a wheel–rail system was established by using the finite-element software ABAQUS, and the complex eigenvalue analysis of influence factors of rail corrugation was conducted based on wheel–rail contact parameters obtained by dynamic calculation. Through the stability analysis of the wheel–rail system with different fastener vertical and lateral stiffnesses, friction coefficients, and superelevation states, we find that properly increasing the fastener vertical and lateral stiffnesses, controlling the wheel–rail friction coefficient below 0.4, and keeping the balanced superelevation state of the track structure can effectively reduce the occurrence possibility of unstable vibration of the wheel–rail system, thus inhibiting the generation and development of rail corrugation. The excess superelevation state of the track structure results in the unstable friction self-excited vibration of the wheel–rail system at the inner wheel–inner rail, while the deficient superelevation state results in the unstable friction self-excited vibration of the wheel–rail system at the outer wheel–outer rail, which shows that the superelevation state of the track structure directly affects the formation of rail corrugation and determines the development order of corrugation of inner and outer rails. This conclusion can well explain the cause of corrugation appearing on only one side rail.

Train Detection by Magnetic Field Measurement with Giant Magnetoresistive Sensors for High-Speed Railway

2013 ◽  
Vol 284-287 ◽  
pp. 2102-2114 ◽  
Author(s):  
Shu Qi Zhang ◽  
Wing Kin Lee ◽  
Philip W.T. Pong
Keyword(s):  
Magnetic Field ◽  
Field Measurement ◽  
High Speed ◽  
Detection System ◽  
Magnetic Field Measurement ◽  
Signaling System ◽  
High Speed Rail ◽  
High Speed Railway ◽  
Rail System ◽  
Safety And Reliability

Train detection, as part of the railway signaling system, is important for safe operation of high-speed railway. The recent flourishing development of high-speed railway stimulates the research need of train detection technology to enhance the safety and reliability of train operation. This paper proposes a new technique for train detection through magnetic field measurement by giant magnetoresistive sensors. This technology was studied by the analysis of magnetic field distribution in the high-speed rail system obtained from modeling and simulation. The results verify the feasibility for detection of train presence, number of rolling stocks, speed, and length. It can overcome the limitations of track circuits and provide additional measurement capabilities to the signaling system. This detection system can be built with low cost and minimal maintenance load as well as compacted construction. Therefore, it may serve as a new train detection system to help improve the current systems, enhancing and promoting the safety and reliability of high-speed rail system.

Characteristics of Settlement and Assessment Methods of Engineered Structures under Certain High-Speed Railway Tracks in China

2012 ◽  
Vol 446-449 ◽  
pp. 1869-1879
Author(s):  
Shi Guo Xiao ◽  
Qing Rong Yan ◽  
Wen Chen
Keyword(s):  
High Speed ◽  
Construction Process ◽  
Small Magnitude ◽  
High Speed Railway ◽  
Railway Line ◽  
Railway Tracks ◽  
Analysis Methods ◽  
Predictive Methods ◽  
Engineered Structures ◽  
Line Construction

The assessment of settlement deformation of engineered structures under high-speed railway tracks is an important control link in high-speed railway line construction. This paper discusses characteristics of settlement deformation of sections of subgrade, bridges and tunnels, and analyzes the suitability of predictive methods in currently available technical codes and standards based on measured data of settlement deformation. Currently available assessment analysis methods have good applicability for subgrade sections but are not suitable for sections of bridges and tunnels. Suitable assessment analysis methods are proposed and have been successfully applied to settlement deformation of engineered structures under the tracks of high-speed railway lines. The methods suit the characteristics of “small magnitude and large fluctuation” changes of measured settlement deformations taking account of the construction process of the engineered project.

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