Abstract
A state-dependent contact model including nonlinear contact stiffness and nonlinear contact filtering is used to calculate contact forces and rail vibrations with a time-domain wheel-track interaction model. In the proposed method, the full three-dimensional contact geometry is reduced to a point contact in order to lower the computational cost and to reduce the amount of required input roughness-data. Greens functions including the linear dynamics of the wheel and the track are coupled with a point contact model, leading to a numerically efficient model for the wheel-track interaction. Nonlinear effects due to the shape and roughness of the wheel and the rail surfaces are included in the point contact model by pre-calculation of functions for the contact stiffness and contact filters. Numerical results are compared to field measurements of rail vibrations for passenger trains running at 200 kph on a ballast track. Moreover, the influence of vehicle pre-load and different degrees of roughness excitation on the resulting wheel-track interaction is studied by means of numerical predictions.
Original language | English |
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Pages (from-to) | 429-446 |
Number of pages | 18 |
Journal | Journal of Sound and Vibration |
Volume | 366 |
DOIs | |
Publication status | Published - 31 Mar 2016 |
Keywords
- Contact filter effect
- Contact stiffness
- Rolling noise excitation
- Roughness
- Surface topography
- Wheel-rail contact