Abstract
This paper presents the results of the laboratory experiments carried out in relation to tangential force coefficient between contacting two cylindrical test specimens under different surface conditions, and the numerical analysis results of hunting stability of railway vehicle with a fine unevenness on wheel tread. In the laboratory experiments, the tangential force coefficient of specimens with/without a variety of fine unevenness under different attack-angles has been obtained by means of a two-disk rolling contact machine. The experimental results showed, in the case of attack-angle is zero, the longitudinal tangential force coefficient becomes smaller when a fine unevenness is larger than the case without fine unevenness, On the other hand, in the case of the attack-angle is about 0.2deg, the lateral tangential force coefficient is small when the interval of a fine unevenness is large. Furthermore, a numerical analysis was carried out to estimate the relationship between a variety of fine unevenness and the hunting stability of railway vehicles. As a result of this papa-, it is clarified that a fine unevenness on wheel tread has an improvement effect on the hunting stability of railway vehicle.
