Abstract
This paper deals with the lateral stability for a railway vehicle. Particularly, nonlinear critical speed is investigated via bifurcation analysis. Shooting method and trust region algorithm are applied to calculate the limit cycle of the nonlinear dynamic vehicle model. In case of the investigated vehicle model, the influences of the suspension parameters on the critical speeds are not large. The effects of friction coefficient are also small. However, there is an overall consistency that the nonlinear critical speed is decreased when the stiffness of the suspension is reduced. Study of the excitation conditions where the stable limit cycles occur gives very useful information to understand the nonlinear dynamic behavior of a railway vehicle and to test the vehicle with roller rig test stands. According to the results, the direction of the excitation is very important as well as the amplitude and frequency to acquire accurate nonlinear critical speed.
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This paper was recommended for publication in revised form by Editor Yeon June Kang
Joon-Hyuk Park received the B.S. degree from KAIST, Daejeon, Korea in 1998, and the M.S. and Ph.D. from Yonsei University, Seoul, Korea in 2000, 2005, respectively, all in Mechanical Engineering. He is a senior researcher at the Vehicle Dynamics & Propulsion Research Department in Korea Railroad Research Institute. His research interests are related to vehicle dynamics including the mechatronic railway vehicle and running test and evaluation technology for railway vehicles.
Hyo-In Koh received the M.A. degree in 2001 and the Dr. Ing degree in 2004 from Technical University of Berlin, Germany, in Technical Acoustics. She is a senior researcher at the Railway Environment Research Department in Korea Railroad Research Institute. Her research interests are related to noise reduction and acoustical environment in the railway system.
Nam-Po Kim received a B.S. in Mechanical Engineering from Ajou University in 1985. He then went on to receive his M.S. and Ph.D. degrees from Ajou University in 1992 and 2008, respectively. Dr. Kim is currently a principal researcher at the department of vehicle dynamics and propulsion system at Korea Rail Road Research Institute in Uiwang, Korea. His research interests are in the area of railway vehicle dynamics, active control of running gear for railway vehicle and vehicle system engineering.
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Park, JH., Koh, HI. & Kim, NP. Parametric study of lateral stability for a railway vehicle. J Mech Sci Technol 25, 1657–1666 (2011). https://doi.org/10.1007/s12206-011-0421-0
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DOI: https://doi.org/10.1007/s12206-011-0421-0