英文文献.docx

英文文献.docx

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外文原文：

Automaticcontroltechnologyinaerospace,roboticscontrol,missilemanufacturingandotherhigh-techapplicationsinthefieldmoreandmoredepthandextensive,automaticcontroltheoryandtechnologywillfurtherplayamoreimportantrole.Becausesomesystemscannotdirectlyexperiment,itcanonlybesimulation,MATLABlanguageappearedforthecontrolsystemsimulationandanalysistoolsbringnew,MATLABsimulationofcontrolsystemshasbecomeanimportantapplicationofanalysisanddesigntools,usingMATLABsoftwareThesimulationtoolboxtoachieveautomaticcontrolsystemintimedomainandfrequencydomainanalysis,statespaceanalysis,intuitively,quicklyanalyzereachthecorrectevaluationofthesystem.

Withautomaticcontroltheoryishumandevelopmentandthedevelopmentof,andincreasedproductivityandtechnologicalprogressandcontinuousimprovement.

In1868,Maxwellopenedthewaytostudythecontrolsystemusingmathematicalmethods,laidthebasisfortime-domainanalysis.In1932,Americanphysicistestablishastabilitycriterion,laidthebasisforfrequencyanalysis.ThenByrdfurtherdevelopment,theformationoftheclassicalcontroltheoryfrequencydomainanalysis.Tothe1960s,thestateequationforthesystemtoamathematicalmodel,optimalcontrolmethodtodeterminethecoreofcontrol,resultingmoderncontroltheory,controltheoryisstilltothedeeperareasofdevelopment,scientificresearchinthecontrolinjectionthevigorousvitality.

MATLABisascientificandengineeringcalculationsforadvancedsoftware,whichprovidesarichsetoffunctionsandmatrixprocessingcapabilities,extremelyeasytouse,andthusthefieldofcontroltheorysoonattractedtheattentionofresearchers.TheMATLABSimulinksimulationofcomplexsystemsmakeitpossible,MATLABtogeneralpurposeapplicationsandprofoundperfectcombinationofprofessionalapplications,asaninternationalcomputingsoftware.

Inmodernsocietytheproductionprocess,inordertoimproveproductquality,productionequipmentandtheneedforautomaticcontroloftheproductionprocess,sothattheamountchargedtothechangeinthedesiredlaw.Thesearecontrolleddevicecalledacontrol

object,iscontrolledbytheamountreferredtotheamountchargedoroutput.

Productionequipmentorproductionprocess,generallyconsideredthegreatestimpactontheoutputquantities,thesequantitiesiscalledinput.

Inputcanbedividedintotwotypes,onetoensuretherequiredbehavioroftheobjecttarget,suchamountiscalledthecontrolinput.Anotherobjectistointerferewiththebehaviorachievethegoal,thistypeofdisturbanceiscalledinput.

Automaticcontrolsystemsarenodirectinvolvementinthecaseoftheproductionprocesscanruninthedesiredoperationofthecontrolsystemtothelaw.Systemrequirementsandtaskstocompletesomecombination.

Inthecontrolprocess,whenthedisturbanceischanged,throughtheeffectofthefeedbackcontrol,afterashorttransition,theamountchargedandrestoredtotheoriginalstablevalue,orinaccordancewithagivenamountofthenewstabilized,thenthesystemfromtheoriginalequilibriumtransitiontoanewequilibrium,wechangetheamountchargediscalleddynamicortransientstate,andtheamountchargedinarelativelystablestateknownasstaticorsteady.Performanceofthecontrolsystemhasthreerequirements.

1,thestability

Stabilityisdefinedasthesystemfromexternalinterferenceorinternaldisturbanceaftereffects,torestoretheoriginalstateortheformationofnewequilibriumcapacity.Stabilityistheprerequisiteforpropersystemoperation.

2,fast

Automaticcontrolsystemnotonlytomeetthedynamicperformancerequirements,butalsotomeetthetransientperformancerequirements.Tomeettherequirementsoftheproductionprocess,thesystemoftenrequiresnotonlyatransientstability,andforthefasterthebetter,thesmallerthebetterdegreeofoscillation.

3,accuracy

Thesystemreachessteady-stateerrorisstable,theoutputbetweentheactualandexpectedvaluesoferrors.Thisperformancereflectsthecontrolaccuracyofthesystemstable,steady-stateerrorissmaller,thebetterthesystemperformance.

Giventhesteadystateerroristheroleofthereferenceinputsignal,whenthesystemhas

stabilized,thesteady-stateoutputandthereferenceinputoftherequireddifferencebetweenthedesiredoutput.

MathWorksMATLABprogramminglanguageinthe1980s,thecompanyintroducedahigh-performancenumericalmatrixcalculationsoftware.Itspowerful,widescopeofapplication,providesarichlibraryfunctions,programmingissimple,understandable,andhighefficiency.MATLABbothasatoolforscientificandengineeringcomputing,orasateachingtoolcontrolsystemphalanx,areessential.Currently,MATLABhasbecomeinternationallyrecognizedasthemostpopularacademicscientificcomputingsoftware.MATLABmainlyconsistsofthreeparts,thefollowingweretobeintroduced.

1,MATLABgraphicsprocessingsystem

ThisisthebasisofMATLABgraphicssystem,whichincludesthegenerationoftwo-dimensionaldataandthree-dimensionaldatavisualization,imageprocessing,animation,andpresentationgraphicsandcreateacompletegraphicaluserinterfacecommands.

2,MATLABMathLibrary

MATLABprovidesaveryrichmathematicalcalculationfunction,youcanperformsimpleandcomplexmathematicalcalculations,suchasmatrixinversion,summation,Besselfunctions,andfastFouriertransform.

3,MATLABApplicationProgramInterface

MATLABusersintheMATLABenvironmenttouseotherprograms,youcanalsocallotherprogramsfromMATLAB.

InadditiontoprovidingMATLABtoolboxfunctionofsomespecialfunctioncommandsavailabletotheuser,butalsoprovidesuserswithamodelingandsimulationworkplatformSimulink.Simulinkusingthemodulecombinationmethodtocreateasystemofcomputermodels,inthisenvironment,usersdonotneedalotofthewritingprocess,andjustbysimplemouseoperation,selectthedesiredlibrarymodules,youcanconstructacomplexsimulationsystem.Itsmainfeatureisfastandaccurate.Forcomplexnonlinearsystems,theeffectismoreobvious.

IntheSimulinkblocklibrary,selectthedesiredmodule,inaccordancewiththerequirementsoftheselectedmoduleisconnected,itcanbesimulation,thesimulationprocess

isdividedintotwostages.

Aninitializationphase

（1）ofthemodelparametersforeffectiveassessmentoftheiractualcalculatedvalueobtained.

（2）toexpandthevariouslevelsofthemodel.

（3）Accordingtotheupdatedlevelofthemodelorder.

2,themodelexecutionphase

（1）werecalculatedforeachmoduleinaccordancewiththeorderofthepoints.

（2）Accordingtothedifferentialinputtodeterminethestatetoobtainadifferentialvector,tocalculatethenextstatevectorofthesamplingpoint.

Timedomainanalysismethodisbasedondifferentialequations,obtaineddirectlyusingtheLaplacetransformofthetimeresponseofthesystem,andthenfollowtheresponsecurvetoanalyzesystemperformance,isadirectsysteminthetimedomainanalysismethod,withintuitiveandaccurateadvantages.Timedomainanalysiscontrolsystemmostcommonlyusedintwoways:

First,whentheinputisaunitstepsignal,thesystemresponseisobtained;Second,whentheinputistheunitimpulsesignal,thesystemresponseisobtained.

Stabilityisanimportantcontrolsystemperformance,butalsothesystemtonormaloperationthefirstcondition.Thesystemisinacertainbalanceoftheoriginalstate,ifitissubjecttoamomentarydisturbanceofthebalancefromtheoriginalstatewhenthedisturbanceafterwithdrawal,thesystemcanreturntotheoriginalequilibriumstate,calledthesystemisstable.Conversely,anunstablesystem.Stabilityofthesystemdependsonlyonthelinearsystemitself,independentoftheoutsideworld.

Ifthesystemisacontinuoustimecontrolsystem,thepolesoftheclosedlooptransferfunctionisstrictlyleft-halfplaneofs,thenthesystemisstablesystem.Ifthesystemisadiscrete-timecontrolsystem,closed-loopeigenvaluesofthezplaneinsidetheunitcircle,thatis,itsclosed-loopeigenvaluesofmoduluslessthan1.

Oftheautomaticcontrolsystemanalysis,timedomainanalysisisadirectmethod,thetransferfunctionforthesystemtoitsmathematicalmodeltoLaplacetransformmathematicaltoolscanbedirectlycalculatedsystemresponse.Althoughthismethodisstraightforward,thedynamicperformanceofthecontrolsystemisveryuseful.

Frequencydomainanalysisistheautomaticcontrolapplicationsinthefieldandthefrequencycharacteristicsofamathematicaltooltostudytheperformanceoftheprocesscontrolsystem,namelystability,rapidandstableprecisionapproach.Thismethodcanintuitivelyexpressthefrequencycharacteristicsofthesystem,andanalysismethodissimple,clearphysicalconcept,thefrequencycharacteristicsofthesystemcanbeseendirectlyonthephysicalessence.Frequencydomainanalysisusesthreekindsofcurvesinthemain:

Bodediagram,Nyquistplot,Nicholscurve.Bodediagramanalysisinthefrequencydomainoccupiesanimportantposition.

Frequencydomainanalysisisnotonlyanopenlooptransferfunctionthroughthelooptransferfunctionofthesystemperformanceoftheanalyticalmethod,andwhenthemathematicalmodelisunknown,themethodcanalsobeestablishedbyexperiment.Inaddition,alargenumberofrichgraphicalapproachallowsfrequency-domainanalysismethod,high-endsystems,theanalysisofthecomplexitydoesnotincreasewiththeorderofasignificantincrease.

Timedomainanalysisandfrequ