This paper initially describes the main features of the radial selfsteering bogies, which have been developed for the high speed train X2000, suburban trains and other applications. One of the main goals with these bogies is to reduce lateral track forces at high speed curving.
This development has been supported by extensive theoretical investigations parallel to practical tests and verifications. Since around 1973 the main tool for theoretical analysis has been time domain simulations of non-linear vehicle-track models under influence of perfect and irregular track geometry. There are models for vertical/longitudinal and for lateral dynamics. The models are assembled and utilised in a specialised computer program, SIMFO, and in a more general computer code, GENSYS, the latter having full 3-dimensional capability.
A frequently used model for lateral dynamics of a four-axle bogie vehicle with 37 degrees of freedom (DOF) is shown as an example. In order to avoid an unrealistically stiff lateral coupling between wheel axles and ground, this model contains lateral track-ground elasticity and I or lateral and torsional DOF for each wheel. By comparison with measurements it is shown that characteristic quasistatic and dynamic behaviour can be simulated with accuracy.
Lateral Track Forces at High Speed Curving Comparisons of Practical and Theoretical Results of Swedish High Speed Train X2000
Vehicle System Dynamics ; 25 , sup1 ; 37-52
1996-01-01
Article (Journal)
Electronic Resource
Unknown
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