Abstract
A digital simulation program of hunting of a vehicle model was developed considering spin and gyroscopic action of wheelsets. Kalker's algorithm 'FASTSIM was introduced for calculations of creep force. Digital simulations for a representative example were made. It was shown that spin had the influence of decreasing creep coefficients equivalently, which decreased the critical speed without yaw dempers and increased that with yaw dempers. On the other hand, gyroscopic action of wheelsets increased criticel speed in all cases considered. It was also shown that spin had slight effect on forced hunting due to rail irregularities at vehicle speed much lower than critical speed, and simulations using Levi-Chartet's equation agreed well with those using 'FASTSIM' when spin was neglected.
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