6Decentralized Adaptive Stabilization of Large-Scale Nonlinear Time-Delay Systems With Unknown High-Frequency-Gain Signs

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1、IEEETRANSACTIONSONAUTOMATICCONTROL,VOL.56,NO.6,JUNE20111473DecentralizedAdaptiveStabilizationofLarge-Scalestability.InSectionV,asimulationexampleisgivenandfinallytheNonlinearTime-DelaySystemsWithUnknownnoteisconcludedinSectionVI.High-Frequency-GainSignsII.PRO

2、BLEMFORMULATIONXudongYeWewillconsiderdecentralizedadaptiveoutput-feedbackstabiliza-tionofthefollowinglarge-scalenonlineartime-delaysystem00Abstract—Inthistechnicalnote,weproposeadecentralizedadaptive0output-f

3、eedbackstabilizerforaclassoflarge-scalenonlineartime-delay.systemswithoutaprioriknowledgeofsubsystemhigh-frequency-gain..signs.Thetimedelayscanbeintheoutputsofsubsystemsandinthein-terconnectionsamongsubsystems.Globalasymptoticstabilizationresults

4、00havebeenprovedandasimulationexampleisgiven.Thenoteenlarges0theclassoflarge-scalenonlinearsystemsforwhichglobaldecentralized00adaptivestabilizercanbedesigned.0

5、0IndexTerms—Adaptivecontrol,decentralizedcontrol,high-frequency-.gainsigns,large-scalesystems,nonlinearsystems,time-delaysystems...000I.INTRODUCTIONAdaptivecontroldesignwithoutapri

6、oriknowledgeofhigh-fre-(1)quency-gainsignisanimportantprobleminhistory,whichmaybewrittenincompactformtracedbackto[1].Whennotallstatevariablesaremeasurable,and0whenthereexistlargeuncertaintiesinsystems,itisdifficulttodete

7、ct0(2)thehigh-frequency-gainsigndirectly.Sincethepioneeringworks[2],[3],manyadaptivecontrolschemeswithoutaprioriknowledgeofhigh-frequency-gainsignhavebeenproposedintheliteratureforwhere,andare,re-linearorno

8、nlinearsystems,see,e.g.,[4]–[13].Alltheseresultsareforspectively,thestate,inputandoutputofsubsystem,thevectorfieldcentralizedsystems.0000Nowadayssys