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Research Papers

Dynamics of Independently Rotating Wheel System in the Analysis of Multibody Railroad Vehicles

[+] Author and Article Information
Hiroyuki Sugiyama

Department of Mechanical Engineering, Tokyo University of Science, Tokyo 102-0073, Japanhsugiy1@rs.kagu.tus.ac.jp

Ryosuke Matsumura

Department of Mechanical Engineering, Tokyo University of Science, Tokyo 102-0073, Japan

Yoshihiro Suda

Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan

Hideaki Ezaki

System Technology Development Center, Kawasaki Heavy Industries, Ltd., Hyogo 673-8666, Japan

J. Comput. Nonlinear Dynam 6(1), 011007 (Oct 04, 2010) (8 pages) doi:10.1115/1.4002089 History: Received May 29, 2009; Revised September 09, 2009; Published October 04, 2010; Online October 04, 2010

In this investigation, dynamic characteristics of independently rotating wheel systems are discussed. To this end, a multibody independently rotating wheelset (IRW) model is developed using the method of velocity transformation. The linear stability analysis of a two-axle IRW truck is performed, the hunting stability and vibration characteristics of IRW truck are investigated, and the results are compared with those obtained using the multibody dynamics model. Good agreement is obtained in hunting frequencies and critical speeds. It is shown using the linear IRW equations that since a constant forward speed is assumed for IRW, the longitudinal slip can occur due to the change in the wheel rolling radius. This leads to longitudinal creep forces even in the case of IRW and it contributes to a coupling of the lateral, yaw, and pitch motions of IRW. Furthermore, it is observed in several numerical examples that, due to small self-centering forces of IRW, continuous flange contact occurs on tangent track, while in curve negotiation, flange contacts on outer wheel of the front axle, as well as that on inner wheel of the rear axle, occur. Such an effect can be more significant when sharp curve negotiation is considered as encountered in light rail vehicle applications.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Two-axle IRW truck

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Figure 2

Parametrization of independently rotating wheelset

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Figure 3

Parametrization of rail

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Figure 4

Modeling of normal contact force: (a) elastic foundation model and (b) Hertz’s contact model

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Figure 5

IRW truck models

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Figure 6

Lateral displacement of suspended independently rotating wheelset

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Figure 7

Decay rate of monotonic decrease mode

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Figure 8

Hunting frequencies of two-axle IRW truck

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Figure 9

Lateral displacement and yaw angle of front axle

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Figure 10

Lateral displacements and angles of attack

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Figure 12

Longitudinal creep forces

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Figure 13

Comparison of angles of attack

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