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International Journal of Railway Technology
IJRT, Volume 1, Issue 2, 2012
A Trajectory Frame-Based Dynamic Formulation for Railroad Vehicle Simulation
A.M. Recuero, J.L. Escalona and R. Chamorro
Department of Mechanical and Material Engineering, University of Seville, Spain
A.M. Recuero, J.L. Escalona, R. Chamorro, "A Trajectory Frame-Based Dynamic Formulation for Railroad Vehicle Simulation", International Journal of Railway Technology, 1(2), 21-44, 2012. doi:10.4203/ijrt.1.2.2
Keywords: multi-body system dynamics, railroad vehicle simulation, trajectory coordinate system, track preprocessor, eigenvalue analysis, railroad track flexibility.
This paper describes a particular formulation based on the trajectory coordinate system (TCS) approach, which is specific to ground vehicles. The formulation possesses as a special feature the use of a single TCS for all the bodies composing the vehicle. The kinematic description of an arbitrary body as well as the expressions for bodies’ absolute translational and rotational velocities and accelerations are developed. Examples of the calculations of external forces when using a single TCS are presented and the obtaining of Newton-Euler equations in terms of generalized coordinates is explained. The suitability of the TCS to achieve some interesting outcomes, such as performing eigenvalue analysis and the consideration of the flexibility of the track, is highlighted in the text. Numerical results regarding a wheel-set and a wagon, moving on straight, spiral and curve stretches, are presented.
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