抄録
Hunting of a railway vehicle is the self-excited oscillation, which is unfavorable for the running stability. Therefore, a lot of research on it has been done. The authors have conducted hunting tests using two different bogies under the condition of the half rolling stock on the roller rigs. The bogies were basically the same as for the structure except for the wheel profile. The result showed that the different types of oscillation occurred depending on the bogie when peripheral wheel speed reached the critical speed of hunting: one is small amplitude oscillation which was generated by the supercritical hopf bifurcation and the other is large amplitude oscillation which was generated by the subcritical hopf bifurcation. As the result of the wheel-rail contact analysis of the two bogies, it was confirmed there was relatively huge difference in their nonlinearity and that could affect the type of hopf bifurcation.
