为了探明机车牵引状态下的横向稳定性,采用多体动力学软件SIMPACK建立了某型提速机车动力学模型,以非线性临界速度作为机车横向稳定性的评判指标,并采用数值积分方法计算了机车临界速度,研究了牵引系数对机车直线和曲线临界速度的影响规律。研究结果表明:机车牵引力的存在改变了轮轨切向蠕滑力的大小和作用方向;随着牵引系数的增大,机车在直线和曲线上的临界速度均先增大后减小;机车曲线上的临界速度低于直线上的,同一牵引系数下,曲线半径越小,临界速度越低;在牵引工况下,轮对横移量不宜再作为机车曲线稳定性的判定指标,采用轮轨纵向蠕滑力对稳定性进行评判更为合理。 In order to verify the lateral stability under locomotive towing condition, a dynamic model of a type of speed-increasing locomotive was established by multi-body dynamics software SIMPACK. The nonlinear critical speed was taken as the evaluation index of the locomotive lateral stability and the numerical integral method was used to calculate The critical speed of the locomotive is studied. The influence of traction coefficient on the linear speed and the critical speed of the curve is studied. The results show that the locomotive traction force changes the size and direction of the tangential direction of the wheel-rail creep force. With the increase of the traction coefficient, the critical speed of the locomotive on both the straight line and the curve first increases and then decreases. The critical speed is lower than the straight line, with the same traction coefficient, the smaller the radius of the curve, the lower the critical speed; Under the traction conditions, the wheelset should not be used as the judgment of the stability of locomotive curve, Longitudinal creep force to judge the stability is more reasonable.