Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
An approximate analytical method to solve frictionless contact between elastic bodies of revolution
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0003-2590-3698
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-3447-6686
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-2571-4662
(English)Manuscript (preprint) (Other academic)
Abstract [en]

An analytical method is proposed for calculating the contact patch and pressure distribution between two elastic bodies generated by rotating arbitrary profiles about parallel axes. The elastic deformation is approximated based on the separation between the bodies in contact. This makes it possible to estimate the contact patch analytically. The contact pressure distribution, in the direction perpendicular to the axes of rotation, is assumed to be elliptic with its maximum calculated by applying Hertz solution locally. The results are exact for contact between two ellipsoids when compared against Hertz's. In non-elliptic contact cases (e.g. in wheel-rail contact) good agreement is achieved in comparison to more accurate but computationally expensive methods such as Kalker's variational method (CONTACT algorithm). Compared to simplified non-elliptic contact methods based on virtual penetration, the calculated contact patch and pressure distribution are markedly improved. The computational cost of the proposed method is significantly lower than the more detailed methods, making it worthwhile to be applied to rolling contact in rail vehicle dynamic simulation.

Keyword [en]
Contact mechanics, Non-elliptic contact, Wheel-rail contact, Vehicle-track interaction, Rolling contact
National Category
Tribology Vehicle Engineering Applied Mechanics
Research subject
Järnvägsgruppen - Fordonsteknik; The KTH Railway Group - Tribology
Identifiers
URN: urn:nbn:se:kth:diva-127948OAI: oai:DiVA.org:kth-127948DiVA: diva2:646705
Note

QS 2013

Available from: 2013-09-09 Created: 2013-09-09 Last updated: 2013-09-11Bibliographically approved
In thesis
1. Wheel-rail contact modelling in vehicle dynamics simulation
Open this publication in new window or tab >>Wheel-rail contact modelling in vehicle dynamics simulation
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The wheel-rail contact is at the core of all research related to vehicle-track interaction. This tiny interface governs the dynamic performance of rail vehicles through the loads it transmits and, like any high stress concentration zone, it is subjected to serious damage phenomena. Thus, a clear understanding of the rolling contact between wheel and rail is key to realistic vehicle dynamic simulation and damage analyses.

In a multi-body-system simulation package, the essentially demanding contact problem should be evaluated in about every millisecond. Hence, a rigorous treatment of the contact is highly time consuming. Simplifying assumptions are, therefore, made to accelerate the simulation process. This gives rise to a trade-off between accuracy and computational efficiency of the contact models in use.

Historically, Hertz contact solution is used since it is of closed-form. However, some of its underlying assumptions may be violated quite often in wheel-rail contact. The assumption of constant relative curvature which leads to an elliptic contact patch is of this kind. Fast non-elliptic contact models are proposed by others to lift this assumption while avoiding the tedious numerical procedures. These models are accompanied by a simplified approach to treat tangential tractions arising from creepages and spin.

In this thesis, in addition to a literature survey presented, three of these fast non-elliptic contact models are evaluated and compared to each other in terms of contact patch, pressure and traction distributions as well as the creep forces. Based on the conclusions drawn from this evaluation, a new method is proposed which results in more accurate contact patch and pressure distribution estimation while maintaining the same computational efficiency. The experience gained through this Licentiate work illuminates future research directions among which, improving tangential contact results and treating conformal contacts are given higher priority.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. xi, 55 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2013:47
Keyword
wheel-rail contact, non-elliptic contact, vehicle-track interaction, rail vehicle dynamics, rolling contact, MBS, virtual penetration
National Category
Tribology Vehicle Engineering Applied Mechanics
Research subject
Järnvägsgruppen - Fordonsteknik; The KTH Railway Group - Tribology
Identifiers
urn:nbn:se:kth:diva-127949 (URN)978-91-7501-852-2 (ISBN)
Presentation
2013-10-02, E2, Lindstedsvägen 3, KTH, Stockholm, 13:15 (English)
Opponent
Supervisors
Note

QC 20130911

Available from: 2013-09-11 Created: 2013-09-09 Last updated: 2013-09-11Bibliographically approved

Open Access in DiVA

No full text

Authority records BETA

Sh. Sichani, MatinEnblom, RogerBerg, Mats

Search in DiVA

By author/editor
Sh. Sichani, MatinEnblom, RogerBerg, Mats
By organisation
Rail VehiclesThe KTH Railway Group
TribologyVehicle EngineeringApplied Mechanics

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 175 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf