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

doi:10.1007/s12204-020-2213-0

J Shanghai Jiaotong Univ Sci ›› 2020, Vol. 25 ›› Issue (6): 714-720.doi: 10.1007/s12204-020-2213-0

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

ZHANG Jingwei (张经纬), LIU Xuewen (刘学文), WANG Yansong (王岩松), WANG Yingyi (王颖轶), LI Ke (李可)

(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)
(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:2020-12-28 Published:2020-11-26
Contact: LIU Xuewen (刘学文) E-mail:liuxuew2002@126.com

Abstract

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

摘要： 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.

关键词: contact loss| short floating slab track (SFST)| critical velocity| alterable element method

CLC Number:

U 211.3

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]. J Shanghai Jiaotong Univ Sci, 2020, 25(6): 714-720.

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

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

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