机车打滑时轮对纵向振动研究

轮轨粘着曲线负斜率会导致传动系统强烈的自激扭转振动，引起轮轨粘着系数周期性的变化，从而会导致轮对纵向振动，轮对纵向振动与轮对粘滑振动耦合作用导致机车复杂的动力学行为。建立机车单轮对传动系统简化模型，考虑轮对回转及纵向自由度。通过数值仿真，再现了平均蠕滑率超过临界蠕滑率时，传动系统扭转振动及轮对纵向振动相轨迹，并计算传动系统扭转和轮对纵向振动频率，利用图解法分析纵向振动机理。结果表明，当机车打滑时，轮对纵向振动为自激振动，轮对纵向振动频率为传动系统扭转固有频率整数倍，且为两倍时振动幅值最大。因此需要合理设置轮对纵向定位刚度等参数，避免打滑时引起的轮对强烈的纵向振动。

Analysis of Longitudinal Vibration of Wheel Set during Locomotive Slippage

Roll-slip oscillation in locomotive is an unstable vehicle motion and it turns into strong self-excited torsional vibration of drives and is usually associated with a negative slop of adhesion curve. The periodic variation of adhesion coefficient between wheel and rail arises and it provokes longitudinal vibration of wheel set. A simplified mathematical model of single wheel-set drive system of locomotive whose rotary and longitudinal freedoms are taken into account is established. The phase trajectory of l...