Hopf Bifurcation and Hunting Behavior in a Rail Wheelset with Flange Contact
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An analytical investigation of Hopf bifurcation and hunting behavior of a rail wheelset with nonlinear primary yaw dampers and wheel-rail contact forces is presented. This study is intended to complement earlier studies by True et al., where they investigated the nonlinearities stemming from creep-creep force saturation and nonlinear contacts between a realistic wheel and rail profile. The results indicate that the nonlinearities in the primary suspension and flange contact contribute significantly to the hunting behavior. Both the critical speed and the nature of bifurcation are affected by the nonlinear elements. Further, the results show that in some cases, the critical hunting speed from the nonlinear analysis is less than the critical speed from a linear analysis. This indicates that a linear analysis could predict operational speeds that in actuality include hunting.
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- Hopf Bifurcation and Hunting Behavior in a Rail Wheelset with Flange Contact
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- 1. Advanced Vehicle Dynamics Laboratory, Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, U.S.A.
- 2. Division of Vibration and Noise Control, Shijiazhuang Railway Institute, Shijiazhuang, 050043, P.R. China