基于CMAC网络的滑模位置控制研究.pdf

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1、机床与液压Dec．2014HydromechatronicsEngineeringV01．42No．24DOI：10．3969／j．issn．1001—3881．2014．24．014ResearchofneuronslidingmodepositioncontrolbasedonCMAC冰Xiao—juanSHIInstituteofMechanicalEngineering，Xi’anUniversityofScienceandTechnology，Xi’an710054，ChinaAbstract：Aimingatuncertainparametersa

2、ndexternaJdisturbanceofNumericaIControI(NC)MachiningToolpositionservosystem，thispaperproposedakindofneuronslidingmodecontrolalgorithmbasedonCMAC(cerebellamodeIarticulationcontro1)bycombingCMACnetworkwithslidingmodecontro1．Thesimulationresultsshowthecontrolmethodefectivelyreducesthec

3、hat．teringphenomenonintheconventionalslidemodevariablestructurecontro1．1talsoshowsthepositionservosystemhasbetterdynamicperformance，staticperformanceandstrongrobust·hess．ItcanrealizerapidandexactpositionsefvocontroI．Keywords：NCmachinetool，Positionservosystem，CMAC，Slidingmodecontrol，

4、Chatteringandadaptability[3_4]．Butitsdominantshortcoming1．Introductionischatteringproblem．Thechatteringconfinesitsfar—therapplicationanddevelopment．ManyimprovedTheperformanceofpositionservosystemforNCmethodhasbeenproposedinavailableliteratures，machinetooldirectlyaffectsthemachininga

5、ccuracybuttheeffectisstillunsatisfactory．Themainmeth—ofmachinetool，whiletheperformanceofpositionodshaveboundarylayermethod，reachinglawmeth—servosystemiscloselyrelatedtoitscontrolstrategy．od，high—gaincontinuousmethod，controlmethodThepositionselwosystemofNCmachinetoolisonebasedonstate

6、andsoon[5-7]．nonlineartimevaryingsystemcontainingnumerousCerebellamodelarticulationcontroller(CMAC)uncertainty．Thestructureorparameterofitsmathe．isakindofformquerytypeadaptationneuralnet—maticsmodelisnotveryaccurate．Theuncertaintywork，itcanexpresscomplicatednonlinearfunction．causing

7、byparametervariationandexternaldisturb—CMACisdifferentfromBPnetwork．Itpossesseslo—anceisatroublesomeproblemforpositionservosys-calapproximationcapabilities，continuousinputout—tem．Whenthiskindofuncertaintyhasmoreseriousputcapabilitiesandcertaingeneralizationcapabili—influenceontheser

8、vosystem，thetraditi