J Shanghai Jiaotong Univ Sci

Journal of Shanghai Jiaotong University(Science) >

2020 , Vol. 25 >Issue 6: 714 - 720

DOI: https://doi.org/10.1007/s12204-020-2213-0

Critical Velocity of Short Floating Slab Track Using Alterable Element Method Considering Wheel-Rail Contact Loss 

Expand
  • (1. School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science,
    Shanghai 201620, China; 2. School of Naval Architecture, Ocean and Civil Engineering,
    Shanghai Jiao Tong University, Shanghai 200240, China)

Online published: 2020-11-26

Fold

Abstract

In actual line operation, the critical velocity is one of the key physical quantities of rail design owing to its great influence on the riding comfort and safety of vehicles due to the wheel-rail contact loss caused by the abrupt change of rail foundation rigidity, rail wear, or abruptness irregularities on rail. In this study, the short floating slab track (SFST) structure is regarded as a double-layer system. The Euler beam and the rigid body model are adopted for the rail and the floating slab, respectively, and the dispersion equation and the theoretical critical velocity of the rail structure under ideal conditions are deduced. Besides, this study considers the implementation of the SFST in the vehicle-structure coupling system. The alterable element method is introduced for accurately simulating the change of the wheel-rail contact state and coding a vehicle-structure dynamic analysis program (VSDAP) to calculate the critical velocity of rail structures from the dynamic response of vehicles and rail structures. The principle of its design at the beginning of the design is given on the basis of the theoretical value of the critical velocity and the simulation of the dynamic response, which can provide reference for practical engineering design.

Key words： contact loss; short floating slab track (SFST); critical velocity; alterable element method

Cite this article

ZHANG Jingwei, LIU Xuewen, WANG Yansong, WANG Yingyi, LI Ke . Critical Velocity of Short Floating Slab Track Using Alterable Element Method Considering Wheel-Rail Contact Loss [J]. Journal of Shanghai Jiaotong University(Science), 2020 , 25(6) : 714 -720 . DOI: 10.1007/s12204-020-2213-0

References

[1] YANG Y B, YAU J D, HSU L C. Vibration of simple beams due to trains moving at high speeds [J]. Engineering Structures, 1997, 19(11): 936-944.
[2] YAU J D, WU Y S, YANG Y B. Impact response of bridges with elastic bearings to moving loads [J]. Journal of Sound and Vibration, 2001, 248(1): 9-30.
[3] YOUCEF K, SABIHA T, EL MOSTAFA D, et al.Dynamic analysis of train-bridge system and riding comfort of trains with rail irregularities [J]. Journal of Mechanical Science and Technology, 2013, 27(4):951-962.
[4] FR′YBA L. A rough assessment of railway bridges for high speed trains [J]. Engineering Structures, 2001,23(5): 548-556.
[5] HUNG H H, YANG Y B. Analysis of ground vibrations due to underground trains by 2.5D finite/infinite element approach [J]. Earthquake Engineering and Engineering Vibration, 2010, 9(3): 327-335.
[6] FEDOROVA M, SIVASELVAN M V. An algorithm for dynamic vehicle-track-structure interaction analysis for high-speed trains [J]. Engineering Structures,2017, 148: 857-877.
[7] TIMOSHENKO S P. On the forced vibrations of bridges [J]. Philosophical Magazine, 1922, 43(6): 1018-1019.
[8] HU J S, YANG S X, REN D Q. Study on the method of end-based vibration signal time-frequency analysis[J]. Journal of Sound and Vibration, 2008, 27(8): 74-79 (in Chinese).
[9] DIMITROVOV′A Z, RODRIGUES A F S. Critical velocity of a uniformly moving load [J]. Advances in Engineering Software, 2012, 50: 44-56.
[10] FROIO D, RIZZI E, SIMOES F M F, et al. Critical velocities of a beam on nonlinear elastic foundation under harmonic moving load [J]. Procedia Engineering,2017, 199: 2585-2590.
[11] CONNOLLY D P, KOUROUSSIS G, LAGHROUCHE O, et al. Benchmarking railway vibrations: Track, vehicle,ground and building effects [J]. Construction and Building Materials, 2015, 92: 64-91.
[12] NSABIMANA E, JUNG Y H. Dynamic subsoil responses of a stiff concrete slab track subjected to various train speeds: A critical velocity perspective [J].Computers and Geotechnics, 2015, 69: 7-21.
[13] STOJANOVIC V, KOZIC P, PETKOVIC M D. Dynamic instability and critical velocity of a mass moving uniformly along a stabilized infinity beam [J]. International Journal of Solids and Structures, 2017, 108:164-174.
[14] GAO Y, HUANG H, HO C L, et al. High speed railway track dynamic behavior near critical speed [J]. Soil Dynamics and Earthquake Engineering, 2017, 101: 285-294.
[15] MEZHER S B, CONNOLLY D P,WOODWARD P K,et al. Railway critical velocity: Analytical prediction and analysis [J]. Transportation Geotechnics, 2016, 6:84-96.
[16] SAURENMAN H, PHILLIPS J. In-service tests of the effectiveness of vibration control measures on the BART rail transit system [J]. Journal of Sound and Vibration, 2006, 293: 888-900.
[17] LIU X W, WU C, XIE J, et al. Theoretical analysis of long floating slab track (Part I): Dispersion graph and critical velocity [J]. Chinese Journal of Computational Mechanics, 2009, 26(6): 919-923 (in Chinese).
[18] LIU X W, WU C, XIE J, et al. Theoretical analysis of long floating slab track (Part II): Receptance [J].Chinese Journal of Computational Mechanics, 2009,26(6): 924-927 (in Chinese).
[19] LIU X W. A study on the dynamic characteristic of floating slab track isolation system of urban light rail[D]. Shanghai, China: Shanghai Jiao Tong University,2007 (in Chinese).
[20] LIU XW, XIE J,WU C, et al. Semi-analytical solution of vehicle-bridge interaction on transient jump of wheel[J]. Engineering Structures, 2008, 30: 2401-2412.

Options
Outlines

/

〈 〉