Self-adaptive fuzzy controller with formulary rule for servo control of discharge gap in Micro EDM  

作　　者：TongHao LiYong 

机构地区：[1]Department of Precision Instruments and Mechanology / state Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China

出　　处：《High Technology Letters》2012年第3期223-229,共7页高技术通讯（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China （No. 2007AA04Z346） , the National Natural Science Foundation of China （ No. 50905094） and China Postdoctoral Science Foundation （ No. 20080440378, 200902097）.

摘　　要：In micro electrical discharge machining （micro EDM）, it is difficult for servo controlling the narrow discharge gap with the characters of non-linear and quick change. In this paper, aiming at solving the problems above, a self-adaptive fuzzy controller with formulary rule （SAFCFR） is presented based on the dual feedbacks composed by gap electric signal and discharge-ratio statistics. To ensure the properties of self-optimizing and fast stabilization, the formulary rule was designed with a tuning factor. In addition, the fast-convergence algorithms were introduced to adjust control target center and output scale factor. In this way, the normal discharge ratio can tend to the highest value during micro-EDM process. Experimental results show that the proposed algorithms are effective in improving the servo-control performance. According to the drilling-micro-EDM experiments, the machining efficiency is improved by 20% through applying SAFCFR. Moreover, SAFCFR is a prompt way to optimize parameters of discharge-gap servo control.

关 键 词：MICRO-EDM self-adaptive fuzzy control discharge gap formulary rule fast con-vergence algorithm 

分 类 号：TG661[金属学及工艺—金属切削加工及机床] TP273.4[自动化与计算机技术—检测技术与自动化装置]