Chapter 5 The Performance of Feedback Control Systems(反馈控制系统的性能)ppt课件.ppt

《Chapter 5 The Performance of Feedback Control Systems(反馈控制系统的性能)ppt课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、CurriculumSystemBasicconceptsSystemmodelingPerformanceissuesanalysiscorrectionTimedomainComplexdomainFrequencydomainChapter5ThePerformanceofFeedbackControlSystemsTestInputSignalsPerformanceofSecond-OrderSystemsThes-PlaneRootLocationandtheTransientResponseTheSteady-StateErrorofFeedbackControlS

2、ystemsEffectsofaThirdPoleandaZeroontheSecond-OrderSystemResponsePerformanceIndicesDesignExamples-SpecifythemeasuresofperformanceDefineandmeasuretheperformanceofcontrolsystemsStabilityTransientresponse：theresponsethatdisappearswithtimeSteady-stateresponse:theresponsethatexistsforalongtimefollo

3、winganinputsignalinitiationDesignspecifications:foraspecifiedinputcommandTimeresponseindicesDesiredsteady-stateaccuracyEffectivecompromise5.1IntroductionStepinputRampinputParabolicinput5.2TestInputSignalsUnitimpulseTheunitimpulsefunctionδ(t)hasthefollowingproperties:Theimpulseinputisusefulwhe

4、nweconsidertheconvolutionintegralfortheoutputy(t)intermsofaninputr(t),whichiswrittenasThegeneralformofstandardtestsignals:5.2TestInputSignalsIftheinputisaunitimpulsefunction,wehaveTheintegralhasavalueonlyatτ=0;therefore,theimpulseresponseofthesystemG(s).Theimpulseresponsetestsignalcanoftenbeu

5、sedforadynamicsystembysubjectingthesystemtoalarge-amplitude,narrowwidthpulseofareaA.ThestandardtestsignalsareofthegeneralformandtheLaplacetransform5.2TestInputSignals5.2TestInputSignalsWithaunitstepinput5.3PerformanceofaSecond-orderSystemTheresponseasafunctionofζandtimeisalsoshowninFigure5.5(

6、b)forastepinput.Asζdecreases,theclosed-looprootsapproachtheimaginaryaxis,andtheresponsebecomesincreas-inglyoscillatory.5.3PerformanceofaSecond-orderSystemWithanimpulsefunctioninputR(s)=15.3PerformanceofaSecond-orderSystemTheswiftnessoftheresponseismeasuredbytherisetimeTrandthepeaktimeTp.Forun

7、der-dampedsystemswithanovershoot,the0-100%risetimeTrisausefulindex.Ifthesystemisover-damped,thenthepeaktimeisnotdefined,andthe10-90%risetimeTr1isnormallyused.TheactualresponsematchingthestepinputismeasuredbythepercentovershootandsettlingtimeT