chapter1.ppt

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1、FundamentalofcontrolengineeringACourse——usedforanalyzinganddesigningaautomaticcontrolsystemChapter1IntroductionFigure1.1*Operatingprinciple……*Feedbackcontrol……1)Awater-levelcontrolsystem21century—informationage,cybernetics(controltheory),systemapproachandinformationtheory,t

2、hreesciencetheorymainstay(supports)in21century.1.1AutomaticcontrolAmachine(orsystem)workbymachine-self,notbymanualoperation.1.2Automaticcontrolsystems1.2.1examplesChapter1Introduction*Operatingprinciple……*Feedbackcontrol……2)AtemperatureControlsystem(showninFig.1.3)*Operatin

3、gprinciple…*Feedbackcontrol(error)…Anotherexampleofthewater-levelcontrolisshowninfigure1.2.Chapter1Introduction3)ADC-Motorcontrolsystem*Principle…*Feedbackcontrol(error)…Chapter1Introduction4)Aservo(following)controlsystem*principle……*feedback(error)……Fig.1.5Chapter1Introdu

4、ction*principle……*feedback(error)……Fig.1.65)Afeedbackcontrolsystemmodelofthefamilyplanning(similartothesocial,economic,andpoliticalrealm(sphereorfield))Chapter1IntroductionFig.1.7Example:1.2.2blockdiagramofcontrolsystemsTheblockdiagramdescriptionforacontrolsystem:Convenienc

5、eChapter1IntroductionamplifierMotorGearingValveActuatorWatercontainerProcesscontrollerFloatmeasurement(Sensor)ErrorFeedbacksignalresistancecomparatorDesiredwaterlevelInputActualwaterlevelOutputFig.1.8FortheFig.1.1,Thewaterlevelcontrolsystem:Figure1.1Chapter1IntroductionFort

6、heFig.1.4,TheDC-MotorcontrolsystemChapter1Introduction1.2.3Fundamentalstructureofcontrolsystems1)OpenloopcontrolsystemsFeatures:Onlythereisaforwardactionfromtheinputtotheoutput.Chapter1Introduction2)Closedloop(feedback)controlsystemsFeatures:1)measuringtheoutput(controlledv

7、ariable).2)Feedback.notonlythereisaforwardaction,alsoabackwardactionbetweentheoutputandtheinput(measuringtheoutputandcomparingitwiththeinput).Chapter1IntroductionNotes:1)Positivefeedback;2)Negativefeedback—Feedback.1.3typesofcontrolsystems1)linearsystemsversusNonlinearsyste

8、ms.2)Time-invariantsystemsvs.Time-varyingsystems.3)Continuoussystemsvs.Discrete(da