Journal ArticleDOI
Fundamentals of vehicle–track coupled dynamics
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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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Journal ArticleDOI
Discrete Element Analysis on Mechanical Properties of Ballast Bed by Tamping in Railway Turnout Areas
TL;DR: In this paper , a coupled simulation model of the large machine tamping device-rail-sleeper-ballast bed in the turnout area is jointly established, and the correctness of the model is verified by the test results of the lateral resistance of the ballast bed.
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Analysis on curve negotiating ability of rail grinder in grinding state
TL;DR: In this article , the curve negotiating ability of rail grinder through modeling and simulation based on one-side grinding is studied in typical case, rail grinding will increase transverse displacement of wheelsets, derailment coefficient of wheels in front wheelset, and unloading rate of wheelset.
Journal ArticleDOI
Dynamic evaluation of elastic bar in track transition section of fast-metro system:
Zhaowei Chen,Hui Fang +1 more
TL;DR: An effective global–local method for evaluating the performance of elastic bar is proposed based on vehicle–track-coupled dynamics, in which two important models are established, namely, the vehicle– track transition section–coupling dynamic model and the three-dimensional finite element model of elastic bars.
Journal ArticleDOI
The effectiveness of distributed acoustic sensing (DAS) for broken rail detection
TL;DR: Field tests carried out on DAS showed that DAS has good potential for detecting broken rails in both scenarios and the moment when rails break.
Journal ArticleDOI
Transient Analysis of Railway Sleeper using Three-Dimensional Finite Element Method
TL;DR: In this article, a study of the transient behavior of railway sleepers subjected to the static load and the impact factor considered for the dynamic effects has been performed by using finite element analysis (FEA) to evaluate the stress and deformation in the concrete and reinforced concrete sleeper.
References
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Book
Dynamics of railway vehicle systems
TL;DR: In this paper, the development of mathematical models and their applications to dynamic analyses and the design of railway vehicles are discussed, and the role of analytical models in various railway vehicle design activities is put in perspective.
Journal ArticleDOI
Modelling of Railway Track and Vehicle/Track Interaction at High Frequencies
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.
Journal ArticleDOI
A Comparison of Alternative Creep Force Models for Rail Vehicle Dynamic Analysis
Z. Y. Shen,J. K. Hedrick +1 more
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.
Journal ArticleDOI
Two simple fast integration methods for large-scale dynamic problems in engineering
TL;DR: A new simple explicit two-step method and a new family of predictor–corrector integration algorithms are developed for use in the solution of numerical responses of dynamic problems, avoiding solving simultaneous linear algebraic equations in each time step.
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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