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
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Book ChapterDOI
DEM Analysis of Ballast Breakage Under Train Loads and Its Effect on Mechanical Behaviour of Railway Track
TL;DR: In this article, a three dimensional discrete element model was developed to simulate the mechanical behavior of railway ballasted track, and the influence of particle breakage on dynamic and deformation behaviour of railway Ballast is demonstrated.
Journal ArticleDOI
Optimizing rail profiles to improve metro vehicle-rail dynamic performance considering worn wheel profiles and curved tracks
TL;DR: The analysis of using the worn wheel and rail profiles as well as LM&CHN60 with a three-dimensional vehicle-track coupled model and an inverse design method is proposed for rail profile design to improve the wheel–rail contact properties.
Train–Track–Bridge Interaction for the Analysis of Railway Bridges and Train Running Safety
TL;DR: Train–track–bridge interaction models are used to study the dynamic response of railway bridges and the dynamics of the train in addition to that of the t bridge.
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Wireless Rail Fastener Looseness Detection Based on MEMS Accelerometer and Vibration Entropy
Zhikun Zhan,Hao Sun,Xiaodong Yu,Jianing Yu,Yuliang Zhao,Xiaopeng Sha,Ye Chen,Qingyun Huang,Wen J. Li +8 more
TL;DR: An automatic inspection system based on micro motion sensors for detecting the “looseness” of rail fasteners that can detect loose fasteners and upload the results to a cloud server in real-time and could potentially bring significant benefits for the day-to-day maintenance of railways.
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Vibration Induced by Subway Trains: Open-Trench Mitigation Analysis in the Time and Frequency Domains
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TL;DR: In this paper, the authors analyzed the mitigation effects of open trenches on the vibrations induced by subway trains and concluded that the open trenches perform well as an isolation barrier, in mitigating the vibration induced in subway trains.
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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