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通过对200 MN模锻液压机力偶调平方式的分析,建立了其力偶调平系统的非线性模型。根据模型中存在的非线性和不确定扰动的结构特点,提出了线性二次型最优控制与反馈线性化方法相结合的双闭环控制策略,并设计了扰动估计器来抑制扰动的影响,实现液压缸的同步控制。仿真对比实验表明,该控制策略优于传统的双闭环PID控制,使调平系统获得更高的调节速度和精度,可使模具准确压合,提高锻件质量,降低废品率,为实际加工过程中的调平控制提供理论依据。
By analyzing the force even leveling of 200 MN forging hydraulic press, a nonlinear model of its force leveling system is established. According to the structural characteristics of nonlinear and uncertain perturbations in the model, a double closed-loop control strategy combining linear quadratic optimal control and feedback linearization is proposed, and the disturbance estimator is designed to restrain the disturbance and achieve Hydraulic cylinder synchronization control. The simulation experiment shows that this control strategy is superior to the traditional double closed-loop PID control, which makes the leveling system obtain higher adjustment speed and precision, which can make the die press fit accurately, improve the quality of the forging and reduce the rejection rate. The level of control provides a theoretical basis.