Transactions of Materials and Heat Treatment

Title：Adaptive compensation of nonlinear friction for die-forging hydraulic press machine based on local Lipschiz projection

Authors： Ma Pengda Li Yibo Pan Qing

Unit： Central South University

KeyWords： die-forging hydraulic press machine stability adaptive control local Lipschitz projection

ClassificationCode：TG315,TP211+.2

year,vol(issue):pagenumber：2016,41(3):73-78

Abstract：

Die-forging press machine (DFPM) plays a very important role in national defense and military industry. However, when DFPM runs at low speed, the phenomena such as speed fluctuation, jitter and even crawling always appear due to the nonlinear friction. To improve the stability of DFPM under a low speed, a new kind of adaptive control method to compensate the nonlinear friction was designed. Based on LuGre model, the friction model parameters were updated by the local Lipschiz projection, and the chattering of control system was reduced by a hyperbolic function. Finally, a Lyapunov function was defined to verify the stability of the control method. Under the environment of Matlab/Simulink, simulation results show that the proposed control method can improve the speed response and the stability of the DFPM at a low speed by comparing with the traditional PID control method.

Funds：

国家973 项目( 2011CB706802)；中南大学创新驱动计划（2015CX002）

麻鹏达（1989-），男，硕士研究生通讯作者：李毅波（1981-），男，博士，副教授

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