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考虑车轮与钢轨的运动特性及轮周牵引力,推导出机车在牵引状态下通过曲线时的轮轨蠕滑率计算公式,并对曲线通过时的轮轨横向动态相互作用特性进行仿真计算与分析;同时研究牵引力大小对转向架导向性能的影响,对比分析了机车牵引与惰行状态下的导向性能。理论仿真分析结果表明:牵引力可以改变轮轨纵向蠕滑力的大小和方向,与惰行工况相比,牵引状态下的轮对导向力矩有所减小,轮对的自导向能力减弱,不利于曲线通过;提高牵引力,总轮轨蠕滑率将很快达到饱和状态,牵引力越大,轮轨纵向蠕滑力越大,两侧纵向蠕滑力差值越小,机车轮对自导向能力越差,轮对冲角增大,而轮轨横向蠕滑力越小;当牵引力增加到一定程度时,总轮轨蠕滑率超过极限状态,曲线通过时两侧轮径差太小而出现打滑和空转的现象。
Considering the movement characteristics of the wheel and the rail and the circumferential traction force, the formula of the wheel-rail creep rate when the locomotive passes the curve under the traction state is deduced, and the characteristics of the wheel-rail lateral dynamic interaction when the curve passes are simulated and analyzed. At the same time, the influence of the traction force on the bogie steering performance was studied, and the guidance performance under locomotive traction and idling conditions was comparatively analyzed. The results of theoretical simulation show that the traction force can change the size and direction of longitudinal wheel-rail creep force. Compared with the coasting conditions, the steering moment under the traction condition decreases, and the self-steering ability of the wheelset decreases, which is not good for Curve through; improve traction, the total wheel-runout rate will reach saturation soon, the greater the traction, the greater the longitudinal wheel-rail creep, the difference between the longitudinal creep on both sides of the smaller, When the traction force increases to a certain extent, the total wheel-rail creep rate exceeds the limit state. When the curve passes, the wheel-diameter difference on both sides is too small and skidding occurs and the wheel- Idling phenomenon.