Abstract
Right estimating of the coefficient of friction between the wheel and rail is essential in modelling rail vehicle dynamics. Constant...
Highlights
The area of steel wheel and rail contact is just about 1cm2
The dynamic behaviour and stability of railway vehicle strongly depend on the wheel-rail interaction [12]
A few theories of rolling contact are implemented in numerical algorithms and apply to vehicle system dynamics (VSD) packages
Summary
The area of steel wheel and rail contact is just about 1cm. In the tiny contact zone the contact forces that carry the load and roll of the train are transmitted. A few theories of rolling contact are implemented in numerical algorithms and apply to vehicle system dynamics (VSD) packages. To obtain results presented in this paper, tested for many years and used widely FASTSIM algorithm is applied [5, 7] It based on the so-called simplified theory, where the material constitutive behaviour is approximated. The coefficient of friction ( ) is one layer of the key parameters characterising the wheel – rail contact properties in theoretical researches. Leading wheelset’s lateral displacements yp (of the 4-axle vehicle) is the chosen, observed and recorded parameter It represents either stable or unstable solutions in the vehicle velocity (bifurcation parameter) domain. To check wide range of values influence on rail vehicle stability, 24 series of simulations were executed. Couples of bifurcation diagrams that present both these parameters in vehicle velocity domain were accepted as a form of the results presentation (fig. 5...7)
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