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Vehicle dynamics of a high-speed passenger car due to aerodynamics inside tunnels
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.ORCID iD: 0000-0002-2571-4662
2007 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, Vol. 221, no 4, 527-545 p.Article in journal (Refereed) Published
Abstract [en]

High train speeds inside narrow double-track tunnels using light car bodies can reduce the ride comfort of trains as a consequence of the unsteadiness of the aerodynamics. This fact was substantiated in Japan with the introduction of the series 300 Shinkansen trains more than a decade ago, where the train speed is very high also in relatively narrow tunnels on the Sanyo line.

The current work considers the resulting effects of vehicle dynamics and ride comfort with multi-body dynamics using a model of the end car of the German high-speed train ICE 2. The present efforts are different from traditional vehicle dynamic studies, where disturbances are introduced through the track only. Here disturbances are also applied to the car body, which conventional suspension systems are not designed to cope with.

Vehicle dynamic implications of unsteady aerodynamic loads from a previous study are examined. These loads were obtained with large eddy simulations based on the geometry of the ICE 2 and Shinkansen 300 trains.

A sensitivity study of some relevant vehicle parameters is carried out with frequency response analysis (FRA) and time domain simulations. A comparison of these two approaches shows that results which are obtained with the much swifter FRA technique are accurate also for sizable unsteady aerodynamic loads. FRA is, therefore, shown to be a useful tool to predict ride comfort in the current context.

The car body mass is found to be a key parameter for car body vibrations, where loads are applied directly to the car body. For the current vehicle model, a mass reduction of the car body is predicted to be most momentous in the vicinity of 2 Hz.

Place, publisher, year, edition, pages
2007. Vol. 221, no 4, 527-545 p.
Keyword [en]
train aerodynamics, large eddy simulation, tunnel aerodynamics, vehicle dynamics, tail vehicle oscillation, flow-induced vibrations, ride comfort
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6373DOI: 10.1243/09544097JRRT125ISI: 000251853400010Scopus ID: 2-s2.0-37149037971OAI: oai:DiVA.org:kth-6373DiVA: diva2:11066
Note
Uppdaterad från submitted till published(20110118). QC 20110118 Available from: 2006-11-21 Created: 2006-11-21 Last updated: 2011-01-18Bibliographically approved
In thesis
1. Studies of Two Aerodynamic Effects on High-Speed Trains: Crosswind Stability and Discomforting Car Body Vibrations Inside Tunnels
Open this publication in new window or tab >>Studies of Two Aerodynamic Effects on High-Speed Trains: Crosswind Stability and Discomforting Car Body Vibrations Inside Tunnels
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006. viii, 74 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2006:81
Keyword
train aerodynamics, external aerodynamics, tunnel aerodynamics, computational fluid dynamics
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-4174 (URN)
Public defence
2006-11-23, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20110118Available from: 2006-11-21 Created: 2006-11-21 Last updated: 2011-01-18Bibliographically approved

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Berg, Mats

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