论文部分内容阅读
空气动力制动是一种清洁的非粘制动,可辅助高速列车实施紧急制动而备受关注,目前该领域研究者主要关注其制动效果而较少涉及制动风翼的位置控制。因此针对研制的空气动力制动装置样机,研究制动过程中制动风翼的位置控制与优化问题。详细论述空气动力制动装置液压驱动单元的数理方程,并进行建模仿真。对比分析常函数、线性函数和二次函数三种控制函数的制动风翼位置控制响应,选择稳态位置误差和活塞杆运动加速度两个指标对系统性能进行评价。仿真结果表明,采用线性函数代替常函数进行控制可使稳态位置误差从12mm降低到2mm;采用二次函数进行控制可使活塞杆运动加速度从25.71m/s~2降低到3.70m/s~2,系统控制性能提升明显。通过空气动力制动装置样机试验。测量活塞杆位置响应。测量结果表明,使用二次函数进行控制时系统稳态位置误差较小且运动轨迹光滑、加速度小,验证了所提基于二次函数位置控制策略对提高系统控制性能的有效性。提出一种有效、易于实现的空气动力制动风翼位置控制优化策略,以改善控制过程中液压缸的位置响应性能。
Air-powered braking is a clean, non-stick brake that aids high-speed trains in emergency braking and attracts much attention. At present, researchers in this field mainly focus on the braking effect and less about the position control of the braking wing. Therefore, aiming at the prototype of the aerodynamic brake device developed, the position control and optimization of the brake wing during braking are studied. The mathematical equations of the hydraulic drive unit of aerodynamic braking device are discussed in detail and the modeling and simulation are carried out. Comparative analysis of the position control response of the brake wing of the three control functions of the constant function, the linear function and the quadratic function, the steady-state position error and the acceleration of the piston rod are selected to evaluate the system performance. The simulation results show that the linear function can be used instead of the constant function to reduce the steady-state position error from 12mm to 2mm. The quadratic function control can reduce the piston rod acceleration from 25.71m / s ~ 2 to 3.70m / s ~ 2, system control performance improved significantly. Pass aerodynamic brake prototype test. Measure piston rod position response. The measurement results show that the quadratic function control system has a small steady-state position error and a smooth motion trajectory with a small acceleration, which verifies the effectiveness of the proposed quadratic function position control strategy to improve system control performance. An effective and easy to implement aerodynamic braking airfoil position control optimization strategy is proposed to improve the position responsiveness of the hydraulic cylinder during the control process.