Vehicle-track random vibrations considering spatial frequency coherence of track irregularitives

To disclose the possible dynamic behaviours of vehicle-track systems subject to an entire railway network, random vibration analysis is of great concern in railway engineering due to the system geometric and parametric uncertainties. In this work, an emphasis is therefore put on the highly efficient...

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Bibliographic Details
Published inVehicle system dynamics Vol. 60; no. 11; pp. 3977 - 3998
Main Authors Xu, Lei, Zhao, Yongsheng, Zhu, Zixu, Li, Zheng, Liu, Hubing, Yu, Zhiwu
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 02.11.2022
Taylor & Francis Ltd
Subjects
Coherence analysis
Data analysis
Frequency analysis
Irregularities
Numerical analysis
Power spectral density
Rail transportation
Railway engineering
Railway vehicle-track dynamics
Random vibration
random vibrations
Simulation
System dynamics
Tactics
track irregularities
Vibration analysis
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Summary:To disclose the possible dynamic behaviours of vehicle-track systems subject to an entire railway network, random vibration analysis is of great concern in railway engineering due to the system geometric and parametric uncertainties. In this work, an emphasis is therefore put on the highly efficient simulation and numerical analysis of track geometry excitation and its induced system uncertain behaviours. Considering the spatial variability, frequency coherence and constant evolution of track irregularities, the random analysis of track irregularities belongs to a big data analysis scope. By introducing practical tools of power spectral density (PSD), frequency coherence analysis and correlated variable random simulation method, a strategy for obtaining representative and realistic track irregularity PSD samples is proposed. Besides, the modelling method of vehicle-track interactions, where versatile programming tactics to couple the track slab and subgrade elements with incompatible elemental sizes, is introduced. By combining the simulation methods of track irregularities and vehicle-track dynamic interaction, the dynamic performance of vehicle-track systems can be evaluated efficiently, and the full view of system dynamics is revealed with probabilistic characteristics.
ISSN:0042-3114
1744-5159
DOI:10.1080/00423114.2021.1986224