Investigating on the Effects of Random Irregularities of Railway Track by Half-Bogie Model

The vibrations produced by trains include two parts which are deterministic and random vibrations. Due to variation of dynamic loads and patterns of load-time, the random vibration of moving train is one of the most important issues in the field of railway engineering. One of the important sources in producing the train vibrations is rail roughness and irregularities. In this paper, responses of vehicle and railway components caused by half - bogie have been investigated. The model of moving vehicle on the railway track is considered as a half-bogie with two degrees of freedom. The connection elements between wheel and bogie are spring and damper. Also, model of railway system is considered as a beam on a rough surface. After modeling, equations of motion have been extracted for half-bogie and rail system. Then, motion equations of deterministic vibrations have been validated. The results indicated that the responses had good agreement with responses of previous studies. After validating, random equations have been presented in two domains that are time and frequency domains. For analyzing the random vibrations, track irregularity is applied as random, and power spectral densities are selected based on FRA organization. Analyses are performed based on halfbogie and railway parameters. The results have been presented for beam, sprung and un-sprung masses. Also, the results show that the maximum power spectral density of beam decreases with the increase of speed parameter

[1]  David K. H. Chua,et al.  Vibration and Performance of a Subway Track System , 2011 .

[2]  R A J Ford.  Track and Ground Vibrations from Trains Running on Conventional Ballasted Track , 1992 .

[3]  A. R. Khaloo,et al.  Vibration control of beams on elastic foundation under a moving vehicle and random lateral excitations , 2012 .

[4]  Hugh Hunt,et al.  Predicting surface vibration from underground railways through inhomogeneous soil , 2012 .

[5]  V K Garg,et al.  Dynamics of railway vehicle systems , 1984 .

[6]  L Fryba,et al.  VIBRATION OF SOLIDS AND STRUCTURES UNDER MOVING LOADS (3RD EDITION) , 1999 .

[7]  Elena Kabo,et al.  A numerical study of the influence of lateral geometry irregularities on mechanical deterioration of freight tracks , 2012 .

[8]  A. Igeland,et al.  Railhead Corrugation Growth Explained by Dynamic Interaction between Track and Bogie Wheelsets , 1996 .

[9]  H Fujimoto,et al.  Influence of track gauge variation on rail vehicle dynamics (an examination based on comparison between data from a test train running on track with irregularity artificially set and numerical simulation) , 2000 .

[10]  Jerry G. Rose,et al.  Track vibration analysis for railways with mixed passenger and freight traffic , 2008 .

[11]  Jabbar Ali Zakeri,et al.  Dynamic responses of train-track system to single rail irregularity , 2009 .

[12]  Roger M. Goodall,et al.  Monitoring lateral track irregularity from in-service railway vehicles , 2007 .

[13]  T.-P. Chang,et al.  Vibration analysis of a beam with an internal hinge subjected to a random moving oscillator , 2006 .

[14]  L. Auersch.  Train induced ground vibrations: different amplitude-speed relations for two layered soils , 2012 .

[15]  Ladislav Frýba,et al.  Dynamics of Railway Bridges , 1996 .

[16]  Jian Zhang,et al.  Non-stationary random vibration of a coupled vehicle–slab track system using a parallel algorithm based on the pseudo excitation method , 2013 .

[17]  Semiha Turkay,et al.  A study of random vibration characteristics of the quarter-car model , 2005 .

[18]  Hyun-Ho Choi,et al.  The influence of track irregularities on the running behavior of high-speed trains , 2013 .

[19]  Frederic Ward Williams,et al.  Symplectic analysis of vertical random vibration for coupled vehicle–track systems , 2008 .

[20]  Jiahao Lin,et al.  Non-stationary random ground vibration due to loads moving along a railway track , 2006 .

[21]  Saeed Mohammadzadeh,et al.  Effects of maintenance operations on railway track's mechanical behaviour by field load testing , 2014 .

[22]  Yozo Fujino,et al.  Vibration of reinforced concrete viaducts under high-speed train passage: measurement and prediction including train–viaduct interaction , 2010 .

[23]  Semih Sezer,et al.  Dynamic modeling and fuzzy logic control of vibrations of a railway vehicle for different track irregularities , 2011, Simul. Model. Pract. Theory.

[24]  Jiangfeng Wang,et al.  High-speed maglev train-guideway–tunnel–soil modelling of ground vibration , 2012 .

[25]  David Kennedy,et al.  An algorithm to study non-stationary random vibrations of vehicle-bridge systems , 2009 .

[26]  Yun-Li Zhao,et al.  An Efficient Sensitivity Analysis Method for Optimization of Vehicle Random Vibrations , 2011 .

[27]  Frederic Ward Williams,et al.  Non-stationary random vibration analysis of three-dimensional train–bridge systems , 2010 .