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Distributed support modelling for vertical track dynamic analysis
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. University of Navarra, Spain.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
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2018 (English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 56, no 4, p. 529-552Article in journal (Refereed) Published
Abstract [en]

The finite length nature of rail-pad supports is characterised by a Timoshenko beam element formulation over an elastic foundation, giving rise to the distributed support element. The new element is integrated into a vertical track model, which is solved in frequency and time domain. The developed formulation is obtained by solving the governing equations of a Timoshenko beam for this particular case. The interaction between sleeper and rail via the elastic connection is considered in an analytical, compact and efficient way. The modelling technique results in realistic amplitudes of the pinned-pinned' vibration mode and, additionally, it leads to a smooth evolution of the contact force temporal response and to reduced amplitudes of the rail vertical oscillation, as compared to the results from concentrated support models. Simulations are performed for both parametric and sinusoidal roughness excitation. The model of support proposed here is compared with a previous finite length model developed by other authors, coming to the conclusion that the proposed model gives accurate results at a reduced computational cost.

Place, publisher, year, edition, pages
Taylor & Francis, 2018. Vol. 56, no 4, p. 529-552
Keywords [en]
Rail-pads, track models, distributed support, sleeper, corrugation, parametric excitation
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-223525DOI: 10.1080/00423114.2017.1394473ISI: 000424429600003Scopus ID: 2-s2.0-85032814670OAI: oai:DiVA.org:kth-223525DiVA, id: diva2:1184691
Note

QC 20180222

Available from: 2018-02-22 Created: 2018-02-22 Last updated: 2019-02-20Bibliographically approved
In thesis
1. Development of new techniques for the numerical modelling of railway track dynamics. Application to rolling noise assessment
Open this publication in new window or tab >>Development of new techniques for the numerical modelling of railway track dynamics. Application to rolling noise assessment
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The numerical modelling is widely employed for the prediction of the railway track dynamic behaviour, which is of utmost importance for the characterisation of the undesired medium-high frequency phenomena, such as corrugation, wheel-out-of-roundness and noise emission. This study is devoted to the improvement of railway track numerical modelling, the efficient resolution of the problem in the time domain and the assessment of rolling noise for different approaches of the track modelling.

Regarding the enhancement of the railway track numerical modelling, two main core ideas have led the development of this task. On the one hand, the rail modelling, and on the other hand, the characterisation of the finite length nature of track supports. The proposals of this work include two basic premises, accuracy and computational efficiency.

Firstly, the study makes use of Timoshenko beam theory for the numerical description of the rail. However, the conventional Timoshenko finite element involves drawbacks for the description of the rail dynamic behaviour and the calculation of the wheel-rail interaction in the time domain. These problems are addressed by improving the finite element formulation, which is based on the description of its local displacements.

Secondly, the versatility of numerical methods is exploited to develop a distributed model of support. It substitutes the usual concentrated model, which entails overestimation of the periodicity effects and disruption of the wheel-rail interaction in the time domain.

Thirdly, the advantages of the formulation of numerical models in the frequency domain are explored focusing on the ability to fairly describe the sleeper dynamics, the enhancement of the model boundaries and the realistic modelling of the track components dissipative behaviour. Moreover, the frequency domain response can be used to obtain the wheel-rail interaction in the time domain efficiently, by means of the moving Green's function.

Lastly, this work deals with the assessment of rolling noise, in which particular emphasis is made on the influence of track dynamics in the noise prediction. At this regard, a methodology is proposed to account for the track periodicity, load speed and finite length of supports.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019. p. 158
Series
TRITA-SCI-FOU ; 2019:07
Keywords
Track modelling, Timoshenko element, local deformation, distributed supports, moving Green's functions, rolling noise
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-244379 (URN)978-91-7873-102-2 (ISBN)
Public defence
2019-03-15, Salón de Grados, Paseo Manuel Lardizábal, 13, San Sebastián, Spain, 11:00 (English)
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Supervisors
Note

QC 20190220

Available from: 2019-02-21 Created: 2019-02-20 Last updated: 2019-02-21Bibliographically approved

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