电气工程专业英语翻译.doc

《电气工程专业英语翻译.doc》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、实用文档Step7.Tryanoptimaldesign.Ifthetrial-and-errorcompensatorsdonotgiveentirelysatisfactoryperformance,consideradesignbasedonoptimalcontrol.Thesymmetricrootlocuswillshowpossiblerootlocationsfromwhichtoselectlocationsforthecontrolpolesthatmeettheresponsespecifications;youcanselectlocati

2、onsfortheestimatorpolesthatrepresentacompromisebetweensensorandprocessnoise.Plotthecorrespondinganditsrobustnesstoparameterchanges.Youcanmodifythepolelocationsuntilabestcompromiseresults.Returningtothesymmetricrootlocuswithdifferentcostmeasuresisoftenapartofthisstep.orcomputationsviat

3、hedirectfunctionsIqrandIqecanbeused.Anothervariationonoptimalcontrolislaproposeafindstructurecontrollerwithunknownparameters.formulateaperformancecostfunction.anduseparameteroptimizationtofindagoodsetofparametervalues.Comparetheoptimaldesignyieldingthemostsatisfactoryfrequencyresponse

4、withthetransform-methoddesignyouderivedinStep5.SelectthebetterofthetwobeforeproceedingtoStep8.Step8Buildacomputermodel,andcompute(simulate)theperformanceofthedesign.Afterreachingthebestcompromiseamongprocessmodification,actuatorandsensorselection,andcontrollerdesignchoice,runacomputer

5、,实用文档runacomputermodelofthesystem.Thismodelshouldincludeimportantnonlinearitiessuchasactuatorsaturation,realisticnoisesources,andparametervariationsyouexpecttofindduringoperationofthesystem.ThesimulationwilloftenidentifysensitivitiesthatmayleadtogoingbacktoStep5orevenStep2.Designitera

6、tionsshouldcontinueuntilthesimulationconfirmsacceptablestabilityandrobustness.Aspartofthissimulationyoucanoftenincludeparameteroptimization,inwhichthecomputertunesthefreeparametersfarbestforbestperformance.Intheearlystagesofdesign,themodelyousimulatewillberelativelysimple;asthedesignp

7、rogresses,youwillstudymorecompleteanddetailedmodels.Atthisstepitisalsopossibletocomputeadigitalequivalentoftheanalogcontroller.Somerefinementofthecontrollerparametersmayberequiredtoaccountfortheeffectsofdigitization.Thisallowsthefinaldesigntobeimplementedwithdigitalprocessorlogic.Ifth

8、eresu