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为了对金属锻压成形设备中应用广泛的电液位置、压力复合控制过程进行优化,以阀控对顶加载液压缸系统为研究对象,详细分析了电液伺服复合控制系统的工作原理,分别建立了位置控制系统和压力控制系统的数学模型,利用开闭环PID型迭代学习算法不断修正控制输入,并采用一种信号前馈跟踪补偿的控制方法设计了位置-压力复合控制器。仿真结果表明:该方法的运用能有效消除复合控制过程中的冲击电压,实现了执行元件在位置闭环控制与压力闭环控制之间快速、平稳切换,有助于提高主机的控制性能和产品质量。
In order to optimize the electro-hydraulic position and pressure compound control process widely used in metal forging equipment, taking the valve control system as the top loading hydraulic cylinder system, the working principle of the electro-hydraulic servo compound control system is analyzed in detail. Position control system and pressure control system, the closed-loop PID iterative learning algorithm is used to continuously correct the control input, and a position-pressure compound controller is designed by a control method of signal feed-forward tracking compensation. The simulation results show that the method can effectively eliminate impulse voltage in the process of compound control and realize fast and smooth switching of actuator between closed-loop position control and pressure closed-loop control, which helps to improve the control performance and product quality of the host.