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The potential of Fluid Dynamic Absorbers for railway vehicle suspensions

Krishna, Visakh V (2016) The potential of Fluid Dynamic Absorbers for railway vehicle suspensions. Master's, KTH Royal Institute of Technology.

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Abstract

The main running objectives concerning the vertical dynamics of passenger rail vehicles are ride comfort and safety. The goal of this thesis is to employ the use of a Fluid Dynamic Absorber to minimize the vertical acceleration of the car body while minimizing the dynamic force fluctuations in the wheel rail contact. The Fluid Dynamic Absorber is a device which employs a tube with a varying cross section containing oscillating fluid. The device is characterized by two effects: The inertia effect of the oscillating fluid in the varying cross section and the damping effect due to the pressure losses during the fluid flow. It is introduced as a potential damping device for automobiles and also for earthquake resistant buildings. The work encompasses the creation of a linearized approximation of the nonlinear model for parameter selection. Then, a non-linear model is built with the help of the Modelica language for use in time simulation of quarter-car models in the Dymola interface. A generalized design methodology for the device is then developed with the help of design procedures used for common tuned mass dampers and liquid column dampers. Finally, the non-linear model built using the Dymola interface is also exported for use in the full-car model in Simpack using Functional Mock-up Interface. A reduction of about 4% to 5% in the magnitude of the root mean square of the carbody acceleration was observed while the wheel-rail dynamic forces remained the same. Further improvement possibilities and the parameters influencing the vertical dynamic behavior of the vehicle are discussed.

Item URL in elib:https://elib.dlr.de/106080/
Document Type:Thesis (Master's)
Title:The potential of Fluid Dynamic Absorbers for railway vehicle suspensions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krishna, Visakh VKTH Royal Institute of TechnologyUNSPECIFIED
Date:July 2016
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:fluid dynamic Absorber, vertical suspension, railway vehicle dynamics
Institution:KTH Royal Institute of Technology
Department:Department of Aeronautical and Vehicle Engineering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of System Dynamics and Control > Vehicle System Dynamics
Deposited By: Schwarz, Christoph
Deposited On:19 Sep 2016 09:52
Last Modified:31 Jul 2019 20:03

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