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Research Papers

Cross Wind Effects on Vehicle–Track Interactions: A Methodology for Dynamic Model Construction

[+] Author and Article Information
Lei Xu

Train and Track Research Institute,
Key Laboratory of Traction Power,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail:  leix_2013@163.com

Wanming Zhai

Train and Track Research Institute,
Key Laboratory of Traction Power,
Southwest Jiaotong University,
Chengdu 610031, China

1Corresponding author.

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS. Manuscript received August 27, 2018; final manuscript received November 26, 2018; published online January 11, 2019. Assoc. Editor: Corina Sandu.

J. Comput. Nonlinear Dynam 14(3), 031003 (Jan 11, 2019) (11 pages) Paper No: CND-18-1384; doi: 10.1115/1.4042142 History: Received August 27, 2018; Revised November 26, 2018

An efficient and accurate model for the dynamic assessment of vehicle-track behavior subjected to cross wind actions is developed in this paper, where the wind–vehicle–track interaction is regarded as a coupled vibration system. First, a vehicle–track interaction model is proposed by taking the hypotheses of wheel/rail rigid contact and displacement complementarity. Unlike explicit force-based methods, the vehicle-track systems are wholly coupled by interaction matrices and load vectors, which are computationally more efficient than most of the existing methods and fairly accurate in low frequency vibrations. Then, the fluctuating cross winds are simulated by the fast Fourier transform technique from spectral representations with the consideration of spatial correlation of multipoint wind time histories and vehicle movement. The unsteady cross wind forces are obtained by introducing weighting function. Finally, a modeling framework, with the coupled interactions between cross winds, vehicle, and the tracks included, is built effectively. Through the validated dynamic model, the cross wind effects on vehicle-track dynamic performance can be fully revealed. Besides, it is concluded that the dynamic performance of vehicle-track systems differs significantly in various excitation modes, i.e., average cross wind, fluctuating cross wind, and track irregularities.

Copyright © 2019 by ASME
Topics: Vehicles , Wind , Rails , Wheels
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Figures

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Fig. 1

Vehicle-track systems: (a) side view and (b) end view

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Fig. 2

Wind turbulence at space–time field (top) and the wind speed with respect to a moving vehicle (bottom)

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Fig. 3

Spectral comparisons between simulation and target: (a) autospectrum at wind velocity point 1, (b) autospectrum at wind velocity point 10, and (c) cross-spectrum of fluctuating winds between points 1 and 10

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Fig. 4

Modeling framework for wind–vehicle–track interactions

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Fig. 5

Mode of excitation input

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Fig. 6

Time domain track irregularity and its PSD sets [47]

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Fig. 7

Comparison between this model and Zhai et al. under excitation of fluctuating wind forces: (a) car body lateral acceleration, (b) car body vertical acceleration, (c) car body lateral displacement, and (d) car body vertical displacement

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Fig. 8

Car body lateral vibrations under mode of excitations: (a) car body lateral displacement and (b) car body lateral acceleration

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Fig. 9

Wheel-axle force (a) and wheel-rail vertical force (b)

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Fig. 10

Rail lateral displacement (a) and vertical displacement (b)

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Fig. 11

PSD of car body acceleration under different excitations: (a) car body lateral acceleration and (b) car body vertical acceleration

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Fig. 12

PSD of wheel-rail forces: (a) wheel-axle force and (b) wheel-rail vertical force

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Fig. 13

Maximum acceleration of the car body under various excitations: (a) lateral acceleration and (b) vertical acceleration

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Fig. 14

Wheel-rail vertical force: (a) minimum value at the windward side and (b) maximum value at the leeward side

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Fig. 15

Maximum rail displacement: (a) lateral displacement and (b) vertical displacement at the windward side

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Fig. 16

Maximum displacement of the track slab: (a) lateral displacement and (b) vertical displacement

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