The influence of surface roughness on the contact stiffness and the contact filter effect in nonlinear wheel-track interaction
2016 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 366, 429-446 p.Article in journal (Refereed) PublishedText
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. Green's 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.
Place, publisher, year, edition, pages
Academic Press, 2016. Vol. 366, 429-446 p.
Wheel-rail contact, Rolling noise excitation, Roughness, Surface topography, Contact filter effect, Contact stiffness
IdentifiersURN: urn:nbn:se:kth:diva-182140DOI: 10.1016/j.jsv.2015.12.026ISI: 000368560800023ScopusID: 2-s2.0-84957430254OAI: oai:DiVA.org:kth-182140DiVA: diva2:904975
QC 201602202016-02-202016-02-162016-02-20Bibliographically approved