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1 Machine Dynamics Problems

1 1998

1 Meinders T.

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Modeling of a Railway Wheelset as a Rotating Elastic Multibody System

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Meinders T.

tom Vol. 20

209-219

This paper presents a model of a railway wheelset based on the theory of elastic multibody systems. The motion of the ICE wheelset with 4 disk brakes, considering the structural elasticity, is described with a floating reference frame and superimposed elastic deformations linearized with respect to the reference frame. The governing equations of motion are generated in a symbolic form using the symbolic formalism NEWEUL. In order to compute the time-invariant system matrices describing the elastodynamical behaviour of the elastic body, a preprocessor is used generating these terms in a standardized object oriented data model. To increase computational efficiency, condensation techniques are applied and 7 modes computed from a finite element model of the wheelset by ANSYS are chosen to describe the elastic behavior. A free vibration analysis at different speeds has been carried out for the rotating wheeelset in order to investigate the wheelsets sensitivity to vibrations in the medium frequency range, i.e. 30 to 300 Hz. The results indicate that the wheelset shows the characteristic behaviour of an elastic rotor. Subsequently simulations with the model extended by static and dynamic unbalances have been carried out. The results obtained by this analysis proves that there is no substantial coupling between torsional and bending modes without rail-wheel contact.