扩轧管电液伺服系统非线性建模与控制  

Nonlinear Modeling and Control of Electro-hydraulic Servo System of Pipe Expanding Procession

作　　者：倪敬[1] 彭丽辉[2] 项占琴[3] 

机构地区：[1]杭州电子科技大学机械工程学院,杭州310018 [2]浙江工商大学信息与计算科学系,杭州310018 [3]浙江大学现代制造工程研究所,杭州310027

出　　处：《机械工程学报》2009年第5期250-255,共6页Journal of Mechanical Engineering

基　　金：浙江省自然科学基金(Y107024);浙江省教育厅(Y200701019)资助项目

摘　　要：为了研究阀控缸机构的非线性对电液伺服系统控制性能的影响,以钢管生产过程中的扩轧管电液伺服系统为背景,首先通过分析非对称比例(伺服)阀的电信号输入到阀芯位移和阀芯位移到非对称液压缸活塞位移输出过程的非线性特性,建立非对称阀控非对称缸机构的非线性数学模型以描绘实际系统;其次根据实际系统模型的级联性特点,提出了一种融合定量反馈控制理论和扰动估计理论的非线性控制策略,实现了对负载运动和负载压力非线性的分级控制;最后以常规PID控制为基础,对提出控制策略的有效性进行相应的仿真和实际控制对比。结果表明,该控制策略具有更好的系统稳态和动态响应性能,可应用于解决工程实际问题。In order to investigate the influence of nonlinearity of valve controlled cylinder on the performance of electro-hydraulic servo system, based on electro-hydraulic servo system of pipe expanding procession, firstly the nonlinear character of valve＇s electrical signal input to spool position and spool position to cylinder piston displacement output is analyzed, then a nonlinear model on asymmetry cylinder actuated by asymmetry valve is provided to represent the actual system. Secondly, according to two-step character of the actual system model, a nonlinear control approach with quantitative feedback theory （QFT） and perturbation estimation （PE） is put forward to realize the respective control of load motion and load pressure nonlinear dynamics. Finally, compared with conventional PID control, the validity of the proposed control approach is tested by simulation and actual control application. Results show that the proposed algorithm has better dynamic and static response performance. This method provides a useful tool for solving practical engineering problems.

关 键 词：非线性控制 定量反馈控制理论 扰动估计 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]