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The influence of surface roughness on the contact stiffness and the contact filter effect in nonlinear wheel-track interaction
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0002-2683-1553
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design. Eindhoven Univ Technol, Netherlands.ORCID iD: 0000-0002-3609-3005
2016 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 366, 429-446 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

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.
Keyword [en]
Wheel-rail contact, Rolling noise excitation, Roughness, Surface topography, Contact filter effect, Contact stiffness
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-182140DOI: 10.1016/j.jsv.2015.12.026ISI: 000368560800023Scopus ID: 2-s2.0-84957430254OAI: oai:DiVA.org:kth-182140DiVA: diva2:904975
Note

QC 20160220

Available from: 2016-02-20 Created: 2016-02-16 Last updated: 2016-10-12Bibliographically approved
In thesis
1. On the influence of surface roughness on rolling contact forces
Open this publication in new window or tab >>On the influence of surface roughness on rolling contact forces
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Road vehicle tyres, railway wheels and ball bearings all generate rolling contact forces which are transferred within a finite area of contact between the rolling element and the substrate. Either it is visible or not for the human eye, a certain degree of roughness is always present on the contacting surfaces and it influences the generation of both vertical and lateral contactforces. The purpose of this investigation is to enhance the understanding and modelling of the influence from small-scale surface roughness on the generation of rolling contact forces. To this end, a computationally efficient method to include roughness-induced contact nonlinearities in the dynamic modelling of rolling contacts is proposed. The method is implemented in a time domain model for vertical wheel–track interaction to model rolling-induced rail vibrations, showing good agreement with measurements. Furthermore, a test rig is developed and used for the investigation of tyre–road rolling contact forces. Detailed studies are performed on the influence of substrate roughness on the resulting contact forces for a tyre tread block which is rolling at different operating conditions. The choice of substrate as well as the rolling velocity and the slip ratio is observed to have significant influence on the resulting friction coefficient. For high slip ratios, stick–slip oscillations appear, exhibiting frequency content which is largely dependent on the choice of substrate. The outcomes of this study can potentially be used to improve future tyre–road contacts with respect to wear, traction and noise generation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 36 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:75
Keyword
Rolling contact, Surface roughness, Contact forces, Contact modelling, Friction, Road, Asphalt, Substrate, Test-rig, Sliding, Stick–slip, Tyre, Rubber, Tread-block, Wheel–rail interaction
National Category
Engineering and Technology Mechanical Engineering Vehicle Engineering Tribology Fluid Mechanics and Acoustics
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-193935 (URN)978-91-7729-145-9 (ISBN)
Public defence
2016-11-07, F3, Lindstedtsvägen 26, Stockholm, 09:30 (English)
Opponent
Supervisors
Projects
Centre for Eco2 Vehicle Design
Funder
VINNOVA
Note

QC 20161013

Available from: 2016-10-13 Created: 2016-10-12 Last updated: 2016-10-13Bibliographically approved

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Lundberg, Oskar E.Arteaga, Ines Lopez
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