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Train–track coupled dynamics analysis:system spatial variation on geometry,physics and mechanics

Railway Engineering Science 2020年第1期28卷 36-53页

作者： Lei Xu Wanming Zhai School of Civil Engineering Department of Railway EngineeringCentral South UniversityChangsha 410075China Train and track Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

This paper aims to clarify the influence of system spatial variability on train–track interaction from perspectives of stochastic analysis and *** the spatial randomness of system properties in geometry,physics and mechanics,the primary work is therefore simulating the uncertainties realistically,representatively and *** regard to the track irregularity simulation,a model is newly developed to obtain random sample sets of track irregularities by transforming its power spectral density function into the equivalent track quality index for representation based on the discrete Parseval theorem,where the correlation between various types of track irregularities is accounted *** statistically clarify the uncertainty of track properties in physics and mechanics in space,a model combining discrete element method and finite element method is developed to obtain the spatially varied track parametric characteristics,*** stiffness and density,through which the highly expensive experiments in situ can be *** a train–track stochastic analysis model is formulated by integrating the system uncertainties into the dynamics *** examples have validated the accuracy and efficiency of this model and illustrated the effects of system spatial variability on train–track vibrations comprehensively.

关键词： Railway engineering Stochastic dynamic analysis Train-track interaction vehicle-track coupled dynamics track irregularities Longitudinal inhomogeneity

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Application of a Computational Tool to Study the Influence of Worn Wheels on Railway vehicle Dynamics

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Journal of Software Engineering and Applications 2012年第2期5卷 51-61页

作者： Joao Pombo IDMEC Instituto Superior TécnicoTechnical University of LisbonLisbonPortugal.

The search for fast, reliable and cost effective means of transport that presents better energy efficiency and less impact on the environment has resulted in renewed interest and rapid development in railway technology. To improve its efficiency and competitiveness, modern trains are required to travel faster, with high levels of safety and comfort and with reduced Life Cycle Costs (LCC). These increasing demands for vehicle requirements imposed by railway operators and infrastructure companies include maintaining the top operational speeds of trainsets during their life cycle, having low LCC and being track friendly. This is a key issue in vehicle design and in train operation since it has a significant impact on the safety and comfort of railway systems and on the maintenance costs of vehicles and infrastructures. The purpose of this work is to analyze how the wear progression on the wheelsets affects the dynamic behavior of railways vehicles and its interaction with the track. For this purpose a vehicle, assembled with new and worn wheels, is studied in realistic operation scenarios. The influence of the wheel profile wear on the vehicle dynamic response is assessed here based on several indicators used by the railway industry. The running stability of the railway vehicles is also emphasized in this study.

关键词： Wear Prediction Software Steel Wheel Profile vehicle-track Interaction Wheel-Rail Contact Forces

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