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
Consistent Tangent Stiffness of a Three-Dimensional Wheel–Rail Interaction Element
Quan Gu,Jinghao Pan,Yongdou Liu +2 more
TL;DR: In this paper, consistent tangent stiffness plays a crucial role in delivering a quadratic rate of convergence when using Newton's method in solving nonlinear equations of motion, and the authors propose a method to solve nonlinear problems of motion with consistent tangents.
On-line monitoring of vertical long wavelength track irregularities using bogie pitch rate
TL;DR: In this paper, an on-line monitoring method is proposed to detect the vertical long-wavelength track irregularities based on the bogie pitch rate, which contains double integration, baseline correction and RLS (Recursive Least Squares) adaptive compensation filter.
Journal ArticleDOI
In situ evaluation of dynamic characteristics of prefabricated ballastless track slab using EMA and OMA techniques
TL;DR: The results show that the in-situ testing of the track slab modes were subject to the influence of many uncertain factors, resulting in differences between the numerical calculation-based ideal mode shapes and the actual EMA- and OMA-based counterparts.
Journal ArticleDOI
Influence of the finite element type of the sleeper on vehicle-track interaction: a numerical study
TL;DR: In this paper, the authors put an emphasis on clarifying the influence of sleeper finite element types on system dynamic responses in the framework of vehicle-track interaction, and three sleeper element types, namel...
Use of simulations in determination of wheel impact forces P1 and P2 due to rail dip defects
TL;DR: In this article, a rail vehicle-track interaction dynamics model has been applied to determine the track vertical dynamic forces due to rail dip defects such as dip joints and welds, which are required in railway vehicle acceptance procedure.
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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