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A. Pieringer¹, P.T. Torstensson² and J. Giner³

¹Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg, Sweden
²Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, Sweden
³Research Centre for Vehicle Technology, Polytechnical University of Valencia, Spain

Keywords: curve squeal, instability, wheel-rail interaction, stability analysis, time domain, non-linearity, friction.

Summary

Railway curve squeal arises from self-excited vibrations during curving. In this paper, a combination of a frequency- and a time-domain approach for curve squeal is applied in order to compare and evaluate the two different approaches. In the frequency-domain, linear stability is investigated through complex eigenvalue analysis. The time-domain model is based on a Green's functions approach and uses a convolution procedure to obtain the system response. To ensure comparability, the same submodels are implemented in both squeal models. The wheel model includes a single flexible wheel and accounts for inertia effects due to rotation adopting Eulerian coordinates. The track is modelled using the moving element method technique corresponding to a finite element mesh that travels with the vehicle speed. Coulomb's law with a constant friction coefficient is applied to model the local friction characteristics in the contact zone. The frictional instability arises due to geometrical coupling. The rolling contact model applied is Kalker's variational method in the time domain and a linearized version of this method in the frequency domain. Conditions similar to those of a curve on the Stockholm metro exposed to severe curve squeal are studied with both squeal models. The influence of the wheel-rail friction coefficient and the direction of the resulting creep force on the occurrence of squeal is investigated for vanishing train speed. The results of both models show similar tendencies, but differ in the predicted squeal frequencies.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 235 Curve Squeal of Rail Vehicles: Linear Stability Analysis and Non-linear Time-Domain Simulation A. Pieringer¹, P.T. Torstensson² and J. Giner³ ¹Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg, Sweden ²Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, Sweden ³Research Centre for Vehicle Technology, Polytechnical University of Valencia, Spain doi:10.4203/ccp.110.235 purchase the full-text of this paper Full Bibliographic Reference for this paper A. Pieringer, P.T. Torstensson, J. Giner, "Curve Squeal of Rail Vehicles: Linear Stability Analysis and Non-linear Time-Domain Simulation", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 235, 2016. doi:10.4203/ccp.110.235 Keywords: curve squeal, instability, wheel-rail interaction, stability analysis, time domain, non-linearity, friction. Summary Railway curve squeal arises from self-excited vibrations during curving. In this paper, a combination of a frequency- and a time-domain approach for curve squeal is applied in order to compare and evaluate the two different approaches. In the frequency-domain, linear stability is investigated through complex eigenvalue analysis. The time-domain model is based on a Green's functions approach and uses a convolution procedure to obtain the system response. To ensure comparability, the same submodels are implemented in both squeal models. The wheel model includes a single flexible wheel and accounts for inertia effects due to rotation adopting Eulerian coordinates. The track is modelled using the moving element method technique corresponding to a finite element mesh that travels with the vehicle speed. Coulomb's law with a constant friction coefficient is applied to model the local friction characteristics in the contact zone. The frictional instability arises due to geometrical coupling. The rolling contact model applied is Kalker's variational method in the time domain and a linearized version of this method in the frequency domain. Conditions similar to those of a curve on the Stockholm metro exposed to severe curve squeal are studied with both squeal models. The influence of the wheel-rail friction coefficient and the direction of the resulting creep force on the occurrence of squeal is investigated for vanishing train speed. The results of both models show similar tendencies, but differ in the predicted squeal frequencies. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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