数字孪生下的液压缸机械运行位置自动控制  

Automatic Control of Mechanical Operation Position of Hydraulic Cylinders Under Digital Twins

作　　者：陈珩[1] CHEN Heng(Intelligent Manufacturing College,Guangxi Vocational and Technical College of Industry,Nanning 545001,China)

机构地区：[1]广西工业职业技术学院智能制造学院,南宁545001

出　　处：《自动化与仪表》2024年第1期24-29,共6页Automation & Instrumentation

摘　　要：液压缸机械系统非线性特征复杂,机械运行行为特征不明确,位置控制结果存在偏差,对此,该文提出数字孪生下的液压缸机械运行位置自动控制方法。连续检测液压缸机械系统运行状态,构建非线性状态方程,对比实际测量数据与输出数据的差异,选取RBF核函数与支持向量机,机械运行位置变化量,描述机械运行行为特征,建立位置控制目标函数,将最高适应度值对应的位置点自动更新为副本位置点,引入猫群算法求解目标函数,对位置控制目标函数的全局最优解展开更新,实现液压缸机械运行位置自动控制。实验结果表明,所提方法应用后,位移检测曲线与实际位移曲线之间的偏差较小,且在恒负载工况下和变负载工况下,位移稳态误差均较小,说明其机械运行位置自动控制结果精度高、控制效率高、控制精度高。The nonlinear characteristics of the hydraulic cylinder mechanical system are complex,the mechanical operation behavior characteristics are unclear,and there are deviations in the position control results.Therefore,a digital twin based automatic control method for the mechanical operation position of hydraulic cylinders is proposed.Continuously detect the operating status of the hydraulic cylinder mechanical system,construct a nonlinear state equation,compare the differences between actual measurement data and output data,select RBF kernel function and support vector machine,describe the changes in mechanical operation position,describe the characteristics of mechanical operation behavior,establish a position control objective function,automatically update the position point corresponding to the highest fitness value to the replica position point,and introduce cat swarm algorithm to solve the objective function,update the global optimal solution of the position control objective function to achieve automatic control of the mechanical operation position of the hydraulic cylinder.The experimental results show that after the application of the proposed method,the deviation between the displacement detection curve and the actual displacement curve is small,and the steady-state error of displacement is small under both constant load and variable load conditions.This indicates that the automatic control results of the mechanical operation position have high accuracy,control efficiency,and control accuracy.

关 键 词：数字孪生技术 液压缸 机械运行位置 自动控制 RBF核函数 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]