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TECHNICAL PAPERS

Nonlinear Analysis on Hunting Stability for High-Speed Railway Vehicle Trucks on Curved Tracks

[+] Author and Article Information
Sen-Yung Lee1

Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701, Republic of China

Yung-Chang Cheng

Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701, Republic of Chinasylee@mail.ncku.edu.tw

1

Corresponding author.

J. Vib. Acoust 127(4), 324-332 (Aug 14, 2004) (9 pages) doi:10.1115/1.1924640 History: Received December 10, 2003; Revised August 14, 2004

Based on the heuristic nonlinear creep model, the nonlinear coupled differential equations of the motion of a ten-degree-of-freedom truck system, considering the lateral displacement, the vertical displacement, the roll and yaw angles of the each wheelset, and the lateral displacement and yaw angle of the truck frame, moving on curved tracks, are derived in completeness. To illustrate the accuracy of the analysis, the limiting cases are examined. The influences of the suspension parameters, including those losing in the six-degree-of-freedom system, on the critical hunting speeds evaluated via the linear and nonlinear creep models, respectively, are studied and compared.

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Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Two-axle truck model

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Figure 2

Free-body diagram of a single wheelset

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Figure 3

Relation between the speed and first element of the equilibrium point

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Figure 4

Time response of lateral displacement of front wheelset at: (a) V=325km∕h, (b) V=375km∕h, and (c) V=400km∕h

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Figure 5

Influence of (a) the longitudinal stiffness Kpx and (b) the lateral stiffness Kpy of the primary suspension on the critical hunting speeds of a 6- and 10-DOF truck system evaluated via the linear and nonlinear creep models, respectively (Kpz=4.32×105N∕m, Cpz=3×104Ns∕m, Csx=9×104Ns∕m, Csy=1.8×103Ns∕m, R=6250m)

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Figure 6

Influence of (a) the longitudinal damping Csx and (b) the lateral damping Csy of the secondary suspension on the critical hunting speeds of a 6- and 10-DOF system evaluated via the linear and nonlinear creep models, respectively (Kpx=9×105N∕m, Kpy=3.9×105N∕m, Kpz=4.32×105N∕m, Cpz=3×104Ns∕m, R=6250m)

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Figure 7

Influence of (a) the vertical stiffness Kpz and (b) vertical damping Cpz of the primary suspension on the critical hunting speeds of a truck evaluated via the linear and nonlinear creep models, respectively (Kpx=9×105N∕m, Kpy=3.9×105N∕m, Csx=9×104Ns∕m, Csy=1.8×103Ns∕m, R=6250m)

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Figure 8

Influence of (a) the vertical stiffness Kpz and (b) vertical damping Cpz of the primary suspension on the critical hunting speeds of a truck running on a track with various radii of curvature (Kpx=9×105N∕m, Kpy=3.9×105N∕m, Csx=9×104Ns∕m, Csy=1.8×103Ns∕m)

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