NDLI: Analysis on Impact Loading at Rail Welds at High Speed

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Xiao, Guangwen Xiao, Xinbiao Wen, Zefeng Jin, Xuesong
Copyright Year	2008
Abstract	When a railway vehicle passes through a track with different weld irregularities at high speed, the impact loading of the vehicle coupled with the track is investigated in detail using a coupled vehicle/track model. In this model, a half vehicle is considered and modeled as a multi-body system. In the track model, a Timoshenko beam resting on discrete sleepers is applied to model each rail. Each sleeper is modeled as a rigid body accounting for its vertical, lateral, roll motions. A moving sleeper support model is used to simulate the interaction of the vehicle and the track. The ballast bed is replaced with equivalent masses. The equivalent dampers and springs are used to replace the connections between the parts of the vehicle and track. In calculating the coupled vehicle and track dynamics, Hertzian contact theory and the creep force theory by Shen et al. are, respectively, used to calculate the normal forces and the creep forces between the wheels and the rails. The motion equations of the vehicle-track are solved by means of an explicit integration method. The weld rail irregularity is modeled by setting a local track vertical deviation at a rail weld joint, which is described with a simplified cosine function. In the numerical analysis the effect of the different wavelength, depth, the position of the welded joint in a sleeper span, and vehicle speed is taken into account. The numerical results obtained are greatly useful in the tolerance design of welded rail profile irregularity caused by damage and hand-grinding after rail welding.
Sponsorship	International
Starting Page	719
Ending Page	728
Page Count	10
File Format	PDF
ISBN	9780791848364
DOI	10.1115/ESDA2008-59383
e-ISBN	0791838277
Volume Number	Volume 2: Automotive Systems; Bioengineering and Biomedical Technology; Computational Mechanics; Controls; Dynamical Systems
Conference Proceedings	ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis
Language	English
Publisher Date	2008-07-07
Publisher Place	Haifa, Israel
Access Restriction	Subscribed
Subject Keyword	Railway vehicles Creep Dampers Welding Accounting Wheels Equations of motion Grinding Wavelength Vehicles Rails Design Welded joints Numerical analysis Dynamics (mechanics) Damage Springs
Content Type	Text
Resource Type	Article

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