A multibody model of a passenger coach with conventional as well as with radial- and lateralelastic wheels is analysed. Deterministic and stochastic excitations are applied to the wheelsets. The discussion of deterministic excitations turns out that only polygonalisations of order 3rd and 4th are able to generate in the droning noise in ICE passenger coaches. The strength of a conventional but polygonalised wheelset is investigated where the wheelset is modelled as flexible body. Vehicle speeds are detected where resonance phenomena occur. The evaluation of dynamic stresses at these speeds turns out that the strength of a conventional wheelset is satisfactory even in case of polygonalisation. The rim and disc of radial- and lateralelastic wheels are modelled as rigid bodies, the elasticity of the so-called third suspension is represented by discrete springs and dampers. General and specific damping of the wheel rim is investigated and discussed. An optimisation of the vertical dynamics leads to reduced droning noise as well as lower force level between wheel and rail. The obtained parameters are applied for investigation of the stability of the wheelset motion. Stability tests, especially with respect to the so-called hunting motion, are performed for various parameter sets. This results turn out that the lateral stiffness must be considerably higher than the radial one to guarantee the stability of the hunting motion. Furthermore, the general damping is a good approximation in case of high lateral stiffness and low radial damping, and may simplify stability analyses in this parameter range. Radial and lateralelastic wheels with increased bending stiffness and improved parameters are feasible and the recommended parameters may be used for further developments.
Vibration problems in railway engineering
Schwingungsprobleme bei Eisenbahnfahrzeugen
2002
9 Seiten, 11 Bilder, 40 Quellen
Aufsatz (Konferenz)
Englisch
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