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A nonlinear state-dependent model for vibrations excited by roughness in rolling contacts
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.ORCID iD: 0000-0002-9031-3662
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0002-2578-9453
Show others and affiliations
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.

Place, publisher, year, edition, pages
2015. Vol. 345, no 9, 197-213 p.
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-155193DOI: 10.1016/j.jsv.2015.02.010ISI: 000350998800013Scopus ID: 2-s2.0-84924514876OAI: oai:DiVA.org:kth-155193DiVA: diva2:760100
Note

QC 20150507. Updated from submitted to published.

Available from: 2014-11-03 Created: 2014-11-03 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Vibrations induced by surface roughness in nonlinear rolling contacts
Open this publication in new window or tab >>Vibrations induced by surface roughness in nonlinear rolling contacts
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
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:nbn:se:kth:diva-155049 (URN)
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
2. 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, OskarFinnveden, SvanteBjörklund, StefanLopez Arteaga, Ines

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Journal of Sound and Vibration
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