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Lateral Stability of High-Speed Trains at Unsteady Crosswind
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Crosswind stability of rail vehicles has been a research area for several decades,mainly motivated by vehicle overturning accidents and higher speeds, but in recenttimes also by issues of lower energy consumption and track maintenance costsdemanding lower vehicle weights. During everyday operation, rail vehicles are subjectedto large lateral influences from track irregularities, track curves and crosswind,leading to large suspension deflections and increased crosswind sensitivity.Also unsteady crosswind like gusts calls for attention. Simulations of possible vehicleoverturning are necessary, but need to take large deflections and high shear inthe suspension into account. If delivering reasonable results, simulations representan important tool for overturning prediction of the vehicle.

In the present work, multibody simulations of a high-speed vehicle at large lateralinfluences from track curves and track irregularities have been carried out, using ahalf-vehicle model in 2D and a model of a whole vehicle in 3D. The vehicle modelsalso include different suspension models. Corresponding field measurements ofthe relative lateral and vertical deflections in the secondary suspension have beenperformed on a fast train and used for validation of the multibody simulations,resulting in good agreement between measurements and simulations.

The 3D vehicle model was further used to study the vehicle response to unsteadycrosswind during curve negotiation where aerodynamic loads obtained by unsteadyComputational Fluid Dynamics, namely Detached Eddy Simulations, representingthree types of gusts were used. In addition, the method of Quasi Transient GustModelling was evaluated in terms of overturning risk. Strong lateral and roll responsesof the vehicle and influences of the gust duration and the relative differencebetween mean and maximum wind speed were observed. Further, variations of suspensionand mass properties of the vehicle were performed to study the influenceon crosswind sensitivity. The position of the centre of mass of the carbody and thelateral bumpstop clearance showed significant influence on the crosswind stability.

Place, publisher, year, edition, pages
Stockholm: KTH Farkost & Flyg , 2009. , xiii, 31 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2009:79
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-11377ISBN: 978-91-7415-473-3 (print)OAI: oai:DiVA.org:kth-11377DiVA: diva2:274978
Presentation
2009-11-19, S40, Teknikringen 8, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2009-11-05 Created: 2009-11-02 Last updated: 2010-11-02Bibliographically approved
List of papers
1. Measurements and simulations of rail vehicle dynamics with respect to overturning risk
Open this publication in new window or tab >>Measurements and simulations of rail vehicle dynamics with respect to overturning risk
2010 (English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 48, no 1, 97-112 p.Article in journal (Refereed) Published
Abstract [en]

Rail vehicles are exposed to strong lateral influences through curves, track imperfections andcrosswind leading to large deflections of the vehicle suspension systems and carbody displacements.In turn this increases the risk of vehicle overturning. In the present work multibodysimulations are performed in order to study the motion in the secondary suspension. Suspensiondeflection measurements on a fast test train were carried out and used for validation ofthe simulations. The simulations show good agreement with the measurements and representa good tool to predict the motion in the secondary suspension.

Place, publisher, year, edition, pages
Milton Park: Taylor & Francis, 2010
Keyword
Rail vehicle dynamics, overturning risk, crosswind, suspension modelling, multibody simulations, field measurements
National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Fordonsteknik
Identifiers
urn:nbn:se:kth:diva-11374 (URN)10.1080/00423110903243216 (DOI)000277739200007 ()2-s2.0-77949530641 (Scopus ID)
Note

22nd International Congress of Theoretical and Applied Mechanics, Adelaide, AUSTRALIA, AUG 24-29, 2008. QC 20150630

Available from: 2009-11-02 Created: 2009-11-02 Last updated: 2017-12-12Bibliographically approved
2. Dynamics of a high-speed rail vehicle negotiating curves at unsteady crosswind
Open this publication in new window or tab >>Dynamics of a high-speed rail vehicle negotiating curves at unsteady crosswind
2010 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 224, no F6, 567-579 p.Article in journal (Refereed) Published
Abstract [en]

Rail vehicles in everyday operation experience large lateral influences from curves and track imperfections, yielding large suspension deflections and displacements of the carbody relative to the track. Aerodynamic loads caused by crosswind may deteriorate the conditions that can result in vehicle overturning. This study investigates the influence of crosswind on a highspeed rail vehicle negotiating a curve. A multi-body simulation model of a high-speed rail vehicle is subjected to unsteady aerodynamic loads. The vehicle response is studied for different gusts, and variations of some vehicle parameters are performed.

Place, publisher, year, edition, pages
London: Professional Engineering Publishing, 2010
Keyword
Rail vehicle dynamics, crosswind stability, overturning risk, unsteady aerodynamics, multibody simulations, CFD, computational fluid dynamics
National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Fordonsteknik
Identifiers
urn:nbn:se:kth:diva-11376 (URN)10.1243/09544097JRRT335 (DOI)000284103500006 ()2-s2.0-78349250908 (Scopus ID)
Note
QC 20101102. Uppdaterad från accepted till published (20101213).Available from: 2009-11-02 Created: 2009-11-02 Last updated: 2017-12-12Bibliographically approved

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