Influence of Curve Geometric Parameters on the Curve Negotiation Performance of Freight Car Bogies

SIMPACK Software is applied to establish the dynamic model of the subframe radial bogie and the cross-braced bogie,in which simulation calculation of its dynamic performance is carried out.The influences of the curve radius and superelevation on the curve negotiation capability of two types of bogies are compared and analyzed.The results show that the influences of curve radius and inadequate superelevation on the derailment coefficients and wheel load reduction rate of both radial bogie and cross-braced bogie are comparatively similar.When the curve radius is in the range of 400—1 200 m,the self-steering radial bogies may effectively improve the negotiation performance,clearly reduce the attack angle of wheelsets,and decrease the wear of wheel/rail.The effects of inadequate superelevation on the wheelsets attack angles of two types of bogies are approximately in linear relationship,and the influence degree of which is only related to the self-property of bogies and has nothing to do with curve radius.This article indicates that applying the wear power to evaluate the influence of inadequate superelevation on wheel/rail wear is more rational.That is because it not only can reflect the wear has no relationship with inadequate superelevation,but also show the change characteristics of wheel/rail wear at different settings of the outer rail superelevation.This is in accordance with the actual project to reduce the wear of wheel/rail by decreasing the outer rail superelevation and setting inadequate superelevation.