The generation of forces in contact area between wheel and rail due to roughness is an inherently non-linear process. In order to provide an excitation input to existing linear analytical models of wheel/rail noise, two alternate calculation procedures have been examined for estimating these interaction forces, the distributed point reacting spring (DPRS) procedure and the Boussinesq procedure. Both procedures are based on estimating the blocked force produced by roughness. The blocked force can then be used in the linear wheel/rail ananlytical models to calculate wheel and rail response and sound radiation. The DPRS procedure is substantially more computationally efficient than the Boussinesq and is found to provide similar estimates of the normal stress distribution in the contact zone for roughness wavelengths that are long compared to the contact area dimensions. On the other hand, the two procedures provide quite different estimates of the normal stress distribution in the contact zone when the roughness wavelenghts are short compared to the dimensions of the contact area. When the two models are used to estimate the blocked interaction force between the wheel and rail for measured wheel and rail two-dimensional roughness distributions, however, the blocked force predictions are very similar even for wavelengths that are the order of or slightly shorter than the dimensions of the contact area.
Estimation of wheel/rail interaction forces in the contact area due to roughness
Bestimmung von Wechselwirkungkräften bei der Berührungsfläche von Rad und Schiene infolge von Rauhigkeit
1996
20 Seiten, 21 Bilder, 4 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Englisch
Estimation of wheel-rail interaction forces in the contact area due to roughness
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