双向液压机位移-力双变量高精度耦合控制方法  

High-precision Displacement-force Dual-variable Coupling Control Method for Bidirectional Hydraulic Press

作　　者：武哲 杨钢[1] 李宝仁[1] 甘润林 WU Zhe;YANG Gang;LI Baoren;GAN Runlin(School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan,Hubei 430074)

机构地区：[1]华中科技大学机械科学与工程学院,湖北武汉430074

出　　处：《液压与气动》2024年第9期25-32,共8页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(51975223)。

摘　　要：针对双向液压机电液伺服系统中位移-力双变量高精度耦合控制需求,基于负载口独立控制结构设计了一种双向液压机位移-力耦合控制电液伺服系统,并建立了相应的数学模型,揭示了基于线性负载的位移-力耦合控制系统的物理规律,提出一种双向液压机位移-力耦合控制解耦方法,并通过仿真和试验平台对该方法有效性进行验证。结果表明,当系统运行稳定后,力的最大超调量为1.42%,位移的最大超调量为0.8%,力闭环跟踪误差的标准差为447.5 N,位移闭环跟踪误差的标准差为0.037 mm。该方法实现了双向液压机位移与力的高精度耦合控制,增加了系统的自由度,为位移-力双变量耦合控制解耦方法的研究提供了新思路。To meet the demand for high-precision coupled control of displacement and force in the electro-hydraulic servo systems of bidirectional hydraulic press,a kind of separate meter in and meter out electro-hydraulic servo system for bidirectional hydraulic presses is designed.A corresponding mathematical model is established,revealing the physical laws of the displacement-force coupled control system based on linear loads.A decoupling method for displacement-force coupled control of the bidirectional hydraulic press is proposed,simulation analysis and experimental validation are conducted based on linear loads.The results show that once the system stabilizes,the maximum overshoot of force is 1.42%,the maximum overshoot of displacement is 0.8%,the standard deviation of the force closed-loop tracking error is 447.5 N,and the standard deviation of the displacement closed-loop tracking error is 0.037 mm.This method not only achieves the high-precision coupled control requirements of displacement and force for the bidirectional hydraulic press but also enhances the system's degrees of freedom,offering a new approach to the study of decoupling methods in the displacement-force coupled control.

关 键 词：双向液压机 线性负载 负载口独立 位移-力耦合控制 高精度 

分 类 号：TH137[机械工程—机械制造及自动化] TP271[自动化与计算机技术—检测技术与自动化装置]