Journal ArticleDOI
Fundamentals of vehicle–track coupled dynamics
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TLDR
In this article, a three-dimensional vehicle-track coupled dynamics model is developed in which a typical railway passenger vehicle is modelled as a 35-degree-of-freedom multi-body system.Abstract:
This paper presents a framework to investigate the dynamics of overall vehicle-track systems with emphasis on theoretical modelling, numerical simulation and experimental validation. A three-dimensional vehicle-track coupled dynamics model is developed in which a typical railway passenger vehicle is modelled as a 35-degree-of-freedom multi-body system. A traditional ballasted track is modelled as two parallel continuous beams supported by a discrete-elastic foundation of three layers with sleepers and ballasts included. The non-ballasted slab track is modelled as two parallel continuous beams supported by a series of elastic rectangle plates on a viscoelastic foundation. The vehicle subsystem and the track subsystem are coupled through a wheel-rail spatial coupling model that considers rail vibrations in vertical, lateral and torsional directions. Random track irregularities expressed by track spectra are considered as system excitations by means of a time-frequency transformation technique. A fast explicit integration method is applied to solve the large nonlinear equations of motion of the system in the time domain. A computer program named TTISIM is developed to predict the vertical and lateral dynamic responses of the vehicle-track coupled system. The theoretical model is validated by full-scale field experiments, including the speed-up test on the Beijing-Qinhuangdao line and the high-speed running test on the Qinhuangdao-Shenyang line. Differences in the dynamic responses analysed by the vehicle-track coupled dynamics and by the classical vehicle dynamics are ascertained in the case of vehicles passing through curved tracks.read more
Citations
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Proceedings ArticleDOI
The Analysis of Wheel-rail Vibration Signal Based on Frequency Slice Wavelet Transform
TL;DR: In this paper, a fault diagnosis approach using time-frequency slice analysis is proposed to extract the features of wheel-rail vibration, which is based on the characteristic of the signal energy distribution.
Journal ArticleDOI
Curved Ballasted Track–Vehicle Dynamic Interaction: Effects of Curve Radius and Track Structural Nonlinearity
TL;DR: In this paper, a model for characterizing the ballasted track-vehicle interaction is presented, where the vehicle is modelled as a multi-rigid-body system consisting of a car body, two bogie frames and four wheelsets.
Dissertation
Contribution à l'objectivation des prestations dynamiques sur simulateur de conduite
TL;DR: In this paper, Petiot et al. propose a methodologie d'evaluation subjective, sur simulateur, des prestations liees a la dynamique du vehicule and de l'appliquer pour la caracterisation d'un systeme de correction de trajectoire.
Journal ArticleDOI
Nonlinear effects of a new mesh-type rail pad on the coupled vehicle-slab track dynamics system under extremely cold environment
TL;DR: In this paper , a mesh-type rail pad is used to simulate the dynamic stiffness and damping of a vehicle-slab track coupled system in extremely cold environment, considering the influences of frequency and amplitude dependence.
References
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Journal ArticleDOI
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Klaus Knothe,S L Grassie +1 more
TL;DR: A review of dynamic modelling of railway track and of the interaction of vehicle and track at frequencies which are sufficiently high for the track's dynamic behaviour to be significant is presented in this paper.
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TL;DR: In this paper, a comparison of alternative Creep Force Models for rail vehicle dynamic analysis is presented, and the results show that the alternative models are less accurate than the original models in terms of acceleration and acceleration.
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Journal ArticleDOI
Vertical dynamic interaction between train and track influence of wheel and track imperfections
Jens C. O. Nielsen,A. Igeland +1 more
TL;DR: In this article, the vertical dynamic behavior of a railway bogie moving on a rail is investigated for sleepers resting on an elastic foundation, and the transient interaction problem is numerically solved by use of an extended state-spacer vector approach in conjunction with a complex modal superposition for the track.
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