Abstract
All forces between wheel and rail (Fig. 3.1) act on a contact patch of a size of about 1.5 \(\mathrm{cm}^2\). The weight of the vehicle is translated through normal forces; the guidance through large-radius curves is provided by tangential forces; and during acceleration and braking, additional tangential forces in the circumferential direction of the wheel arise.
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Notes
- 1.
The rail profile is convex: the rails’ radius of curvature is mathematically positive, since the center of curvature is located on the inner normal. The wheel profile is concave: the radius of curvature is negative. The value \(R_\mathrm{R}\) in Fig. 3.6 is the radius of curvature of the rail profile (with accurate algebraic sign), while \(R_\mathrm{W}\) is the absolute value of the radius of curvature of the wheel.
- 2.
In this case, it is the left wheel from the point of view of the observer traveling with the wheelset. The wheelset is moving out of the figure.
- 3.
That is not necessarily the case for forward displacements of the contact point in tight curves.
- 4.
Velocities on the rail occur, for instance, on a roller rig but also during investigation in the medium- and high-frequency ranges when the rail is no longer regarded as rigid and fixed.
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Knothe, K., Stichel, S. (2017). Modeling of Wheel/Rail Contact. In: Rail Vehicle Dynamics. Springer, Cham. https://doi.org/10.1007/978-3-319-45376-7_3
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