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Vibrations induced by surface roughness in nonlinear rolling contacts
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-2683-1553
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

For efficient transportation in either trains, busses or passenger cars, rolling elements such as wheels, tyres, bearings and transmission elements are fundamental. The energy efficiency and the generation of noise and vibrations in rolling contacts depend on the surface roughness of contacting bodies. In order to optimize the surfaces of rolling elements, prediction of its impact on the dynamic response from rolling excitation is required. A computationally efficient method to include surface roughness in the modelling of rolling contacts is presented. More specifically, nonlinear effects on the contact force due to the threedimensional shape and roughness of the contacting surfaces are introduced in a moving point force formulation. As a consequence of the point force approximation follows the assumption that any dynamic wave motion within the contact area is negligible.The rolling contact force is nonlinear due to a varying relative displacement between contacting bodies and is therefore referred to as state-dependent. A study case for the state-dependent method consisting of a steel ball rolling on a steel beam showed good agreement between numerical predictions and measured beam vibrations. Furthermore, an application to the wheel-rail interaction show that roughness-induced contact nonlinearities have a significant impact on the dynamic response caused by rolling excitation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , x, 30 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2014:66
Keyword [en]
Rolling contact, nonlinear contact, contact stiffness, contact filter, state-dependent method, relative displacement, wheel-rail contact
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-155049OAI: oai:DiVA.org:kth-155049DiVA: diva2:759177
Presentation
2014-11-19, E2, Lindstedsvägen 3 (floor 3), Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
ECO2 Vehicle Design
Funder
Vinnova
Note

QC 20141103

Available from: 2014-11-03 Created: 2014-10-29 Last updated: 2014-11-03Bibliographically approved
List of papers
1. A nonlinear state-dependent model for vibrations excited by roughness in rolling contacts
Open this publication in new window or tab >>A nonlinear state-dependent model for vibrations excited by roughness in rolling contacts
Show others...
2015 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 345, no 9, 197-213 p.Article in journal (Refereed) Published
Abstract [en]

A state-dependent method to model contact nonlinearities in rolling contacts is proposed. By pre-calculation of contact stiffness and contact filters as functions of vertical relative displacement, a computationally efficient modelling approach based on a moving point force description is developed. Simulations using the state-dependent model have been analysed by comparison with measurements. Results from the investigated case consisting of a steel ball rolling over a steel beam having two different degrees of roughness - show good agreement between nonlinear simulations and measured beam vibrations. The promising results obtained with the proposed method are potentially applicable to wheel rail interaction and rolling element bearings.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-155193 (URN)10.1016/j.jsv.2015.02.010 (DOI)000350998800013 ()2-s2.0-84924514876 (Scopus ID)
Note

QC 20150507. Updated from submitted to published.

Available from: 2014-11-03 Created: 2014-11-03 Last updated: 2017-12-05Bibliographically approved
2. Estimation of nonlinearities in the wheel-rail rolling noise generation process
Open this publication in new window or tab >>Estimation of nonlinearities in the wheel-rail rolling noise generation process
2014 (English)In: Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering and USD 2014 - International Conference on Uncertainty in Structural Dynamics, 2014, 3485-3496 p.Conference paper, Published paper (Other academic)
Abstract [en]

The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact stiffness and contact filters are pre-calculated as functions of the vertical wheel-rail relative displacement (state-dependency) using three-dimensional surface data in quasi-static contact computations. By including the state-dependent functions in time-domain prediction of wheel-rail interaction, a computationally efficient method to include nonlinear effects is obtained. Results from predictions of contact forces as well as rail vibrations are presented for two conditions; first, both wheel and rail have surface roughness of broadband character and secondly, a rail corrugation is simulated by superimposing a sinusoidal component on the broadband rail roughness. For a train speed of 200 kph, the contact forces and the dynamic response of the rail exhibit nonlinear contact conditions for both the broadband roughness case as well as for the case where a rail corrugation is simulated.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-155196 (URN)000352201004026 ()2-s2.0-84913528676 (Scopus ID)978-907380291-9 (ISBN)
Conference
26th International Conference on Noise and Vibration Engineering, ISMA 2014, Including the 5th International Conference on Uncertainty in Structural Dynamics, USD 2014, Leuven, Belgium, 15-17 September 2014
Note

QC 20150512

Available from: 2014-11-03 Created: 2014-11-03 Last updated: 2015-05-12Bibliographically approved

Open Access in DiVA

Licentiate Thesis Part I, Overview(1549 kB)423 downloads
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Lundberg, Oskar Erik
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