大型模锻压机极低速非线性摩擦建模与验证  

Nonlinear friction modeling and experimental verification for large die-forging hydraulic press under extremely low speed

作　　者：杨家旺[1] 黄明辉[1] 陆新江[1] 邓坎[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第12期4840-4846,共7页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划("973"计划)项目(2011CB706802;2013CB035801);国家自然科学基金资助项目(51205420;51005251);金属挤压与锻造装备技术国家重点实验室开放基金课题;中南大学自由探索计划项目(2011QNZT055);中南大学研究生学位论文创新基金项目(2011ssxt091)

摘　　要：极低速大型等温模锻压机是强非线性机电液耦合系统,由于摩擦是不可避免的,在极低速运行条件下易出现速度不稳定、抖动、甚至爬行,致使系统的控制效果恶化。压机系统摩擦在低速下具有强非线性静态、动态交替作用的特性,且与其他非线性因素强烈耦合,导致建模与参数辨识变得异常困难。为此,设计大型模锻压机极低速空载运行实验,使非线性摩擦免受其他因素的耦合影响,从而降低摩擦建模的难度和复杂度;在此基础上,采用LuGre模型作为系统的摩擦模型结构,并提出使用粒子群优化算法(PSO)对复杂非线性摩擦参数进行辨识。实验结果表明:该方法能有效的获得实际大型模锻压机极低速下的系统模型。The large die-forging hydraulic press is a nonlinear system of electro-hydraulic coupling. Because friction is inevitable, it will cause the speed fluctuation and instability, even creeping phenomenon under extremely low speed, so that the control performance gets deteriorated. The friction of the press is nolinear, and has both dynamic and static characteristic, and couples with other disturbance factors, so friction modeling and parameter identification get very complicated. Because of this, a no-load test was designed for the press, which could make the nonlinear friction decoupled with the others, enabling friction parameters become easier to identificate. Then, LuGre model was selected and used the particle swarm optimization （PSO） was used for identification friction parameters. The experimental results show that the system model of the large die-forging hydraulic press of extremely low speed can be obtained by the proposed method.

关 键 词：大型模锻压机 低速稳定性 LUGRE模型 粒子群算法 

分 类 号：TH39[机械工程—机械制造及自动化]