C32连续摩擦焊机多缸液压闭环控制技术

Multi Cylinders Hydraulic Closed-loop Control Technology forC32 Continuous Friction Welding Machine

液压系统在阻力、弹性变形和摩擦等影响下,压力损失和能量耗散严重,且需要等待下一个采样周期才能输出控制信号,导致超过期望的控制稳定值,为此,提出C32连续摩擦焊机多缸液压闭环控制技术。分析液压控制系统基本结构,在高功率输出情况下,分析重压力闭环传递函数的极点位置,结合数据采样的偏差值,选择PID控制器进行液压闭环控制;计算液压系统执行器控制律,将初始的连续性PID控制算法转换成离散型,调整PID控制器的增益和各项参数,进行重压力闭环传递函数输出值更新,实现多缸液压闭环控制。试验结果表明,方法能以最快速度对液压系统内稳定节点对应参数作出细微调整,超调量在原始基础上下降,且超调风险值较小。该方法的闭环控制能力强,控制参数响应速度快以及控制稳定性较优。

Under the influence of resistance,elastic deformation,and friction in the hydraulic system,pressure loss and energy dissipation are severe,and it is necessary to wait for the next sampling period to output control signals,resulting in exceeding the expected control stability value.Therefore,a multi cylinder hydraulic closed-loop control technology for C32 continuous friction welding machine is proposed.Analyze the basic structure of the hydraulic control system,analyze the pole position of the heavy pressure closed-loop transfer function under high power output,and select a PID controller for hydraulic closed-loop control based on the deviation value of data sampling;Calculate the control law of the hydraulic system actuator,convert the initial continuous PID control algorithm into a discrete type,adjust the gain and various parameters of the PID controller,update the output value of the heavy pressure closed-loop transfer function,and achieve multi cylinder hydraulic closed-loop control.The experimental results show that after the application of the proposed method,fine adjustments are made to the corresponding parameters of the stable nodes in the hydraulic system at the fastest speed,and the overshoot decreases on the original basis,with a small overshoot risk value.This method has strong closed-loop control ability,fast response speed of control parameters,and excellent control stability.