Abstract
The dynamic instability of railway vehicle bogies and wheelsets is caused by the combined action of the conicity of the wheels and the creep forces acting between the wheels and rails. In this paper, the instability is investigated in the important case where the wheels are profiled rather than purely conical. Equations of motion are formulated and stability criteria obtained which indicate the effect of varying the various parameters of the system. The nature of the motion at the critical speed is investigated and the mode of energy conversion between the forward motion of the vehicle and the lateral motion of the bogie or wheelset is explained.
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