Simulation of Freight Trains Equipped with Partially Filled Tank Containers and Related Resonance Phenomenon

Vera, Carlos and Paulin, Jenny and Suárez Esteban, Berta and Gutiérrez, Mariano (2005). Simulation of Freight Trains Equipped with Partially Filled Tank Containers and Related Resonance Phenomenon. "Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit", v. 219 (n. 4); pp. 245-259. ISSN 0954-4097. https://doi.org/10.1243/095440905X8916.

Description

Title: Simulation of Freight Trains Equipped with Partially Filled Tank Containers and Related Resonance Phenomenon
Author/s:
  • Vera, Carlos
  • Paulin, Jenny
  • Suárez Esteban, Berta
  • Gutiérrez, Mariano
Item Type: Article
Título de Revista/Publicación: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
Date: 1 July 2005
ISSN: 0954-4097
Volume: 219
Subjects:
Freetext Keywords: screw couplings; freight wagons; liquid cargo; sloshing; resonance
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Mecánica y de Fabricación [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

To study the fluid motion-vehicle dynamics interaction, a model of four, liquid filled two-axle container freight wagons was set up. The railway vehicle has been modelled as a multi-body system (MBS). To include fluid sloshing, an equivalent mechanical model has been developed and incorporated. The influence of several factors has been studied in computer simulations, such as track defects, curve negotiation, train velocity, wheel wear, liquid and solid wagonload, and container baffles. SIMPACK has been used for MBS analysis, and ANSYS for liquid sloshing modelling and equivalent mechanical systems validation. Acceleration and braking manoeuvres of the freight train set the liquid cargo into motion. This longitudinal sloshing motion of the fluid cargo inside the tanks initiated a swinging motion of some components of the coupling gear. The coupling gear consists of UIC standard traction hooks and coupling screws that are located between buffers. One of the coupling screws is placed in the traction hook of the opposite wagon thus joining the two wagons, whereas the unused coupling screw rests on a hanger. Simulation results showed that, for certain combinations of type of liquid, filling level and container dimensions, the liquid cargo could provoke an undesirable, although not hazardous, release of the unused coupling screw from its hanger. The coupling screw's release was especially obtained when a period of acceleration was followed by an abrupt braking manoeuvre at 1 m/s2. It was shown that a resonance effect between the liquid's oscillation and the coupling screw's rotary motion could be the reason for the coupling screw's undesired release. Possible solutions to avoid the phenomenon are given.Acceleration and braking manoeuvres of the freight train set the liquid cargo into motion. This longitudinal sloshing motion of the fluid cargo inside the tanks initiated a swinging motion of some components of the coupling gear. The coupling gear consists of UIC standard traction hooks and coupling screws that are located between buffers. One of the coupling screws is placed in the traction hook of the opposite wagon thus joining the two wagons, whereas the unused coupling screw rests on a hanger. This paper reports on a study of the fluid motion-train vehicle dynamics interaction. In the study, a model of four, liquid-filled two-axle container freight wagons was developed. The railway vehicle has been modeled as a multi-body system (MBS). To include fluid sloshing, an equivalent mechanical model has been developed and incorporated. The influence of several factors has been studied in computer simulations, such as track defects, curve negotiation, train velocity, wheel wear, liquid and solid wagonload, and container baffles. A simulation program was used for MBS analysis, and a finite element analysis program was used for liquid sloshing modeling and equivalent mechanical systems validation. Acceleration and braking maneuvers of the freight train set the liquid cargo into motion. This longitudinal sloshing motion of the fluid cargo inside the tanks initiated a swinging motion of some components of the coupling gear. Simulation results showed that, for certain combinations of type of liquid, filling level and container dimensions, the liquid cargo could provoke an undesirable, although not hazardous, release of an unused coupling screw from its hanger. It was shown that a resonance effect between the liquid's oscillation and the coupling screw's rotary motion could be the reason for the coupling screw's undesired release. Solutions are suggested to avoid the resonance problem, and directions for future research are given.

More information

Item ID: 12670
DC Identifier: http://oa.upm.es/12670/
OAI Identifier: oai:oa.upm.es:12670
DOI: 10.1243/095440905X8916
Official URL: http://intl-pif.sagepub.com/content/219/4/245.abstract
Deposited by: Berta Suárez Esteban
Deposited on: 03 Sep 2012 11:39
Last Modified: 21 Apr 2016 11:57
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