论文部分内容阅读
为了高速列车在制动过程中获得最佳黏着力,防止车轮打滑或空转,需要对电机输出转矩进行控制。为此建立异步电机的数学模型和1/4车辆纵向动力学模型,采用直接转矩控制策略控制电机;采用改进的递归最小二乘法预测黏滑曲线的斜率,以判断车轮处于黏着还是滑动状态;利用滑模变结构算法获得最佳参考制动力矩。变轨面条件下的仿真结果表明,上述方法能够有效使切线力系数保持在最大值附近,使滑移率保持在最佳值附近,从而防止因车轮打滑而损伤轮轨。
In order to get the best adhesion of the high-speed train during braking and prevent the wheel from slipping or idling, the motor output torque needs to be controlled. For this reason, the mathematical model of induction motor and the 1/4 vehicle longitudinal dynamics model are established, and the direct torque control strategy is used to control the motor. The improved recursive least square method is used to predict the slope of the stick- slip curve to determine whether the wheel is in the sticking or sliding state. Using sliding mode variable structure algorithm to get the best reference braking torque. Simulation results show that the above method can effectively keep the tangent force coefficient in the vicinity of the maximum value and keep the slip ratio near the optimum value so as to prevent the wheel rail from being damaged by the wheel slipping.