Automatic control theory 自动控制原理课件.ppt

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1、AutomaticcontroltheoryACourse——usedforanalyzinganddesigningaautomaticcontrolsystemChapter1IntroductionFigure1.1*Operatingprinciple……*Feedbackcontrol……1)Awater-levelcontrolsystem21century—informationage,cybernetics(controltheory),systemapproachandinformationt

2、heory,threesciencetheorymainstay(supports)in21century.1.1AutomaticcontrolAmachine(orsystem)workbymachine-self,notbymanualoperation.1.2Automaticcontrolsystems1.2.1examplesChapter1Introduction*Operatingprinciple……*Feedbackcontrol……2)AtemperatureControlsystem(s

3、howninFig.1.3)*Operatingprinciple…*Feedbackcontrol(error)…Anotherexampleofthewater-levelcontrolisshowninfigure1.2.Chapter1Introduction3)ADC-Motorcontrolsystem*Principle…*Feedbackcontrol(error)…Chapter1Introduction4)Aservo(following)controlsystem*principle……*

4、feedback(error)……Fig.1.5Chapter1Introduction*principle……*feedback(error)……Fig.1.65)Afeedbackcontrolsystemmodelofthefamilyplanning(similartothesocial,economic,andpoliticalrealm(sphereorfield))Chapter1IntroductionFig.1.7Example:1.2.2blockdiagramofcontrolsystem

5、sTheblockdiagramdescriptionforacontrolsystem:ConvenienceChapter1IntroductionamplifierMotorGearingValveActuatorWatercontainerProcesscontrollerFloatmeasurement(Sensor)ErrorFeedbacksignalresistancecomparatorDesiredwaterlevelInputActualwaterlevelOutputFig.1.8For

6、theFig.1.1,Thewaterlevelcontrolsystem:Figure1.1Chapter1IntroductionFortheFig.1.4,TheDC-MotorcontrolsystemChapter1Introduction1.2.3Fundamentalstructureofcontrolsystems1)OpenloopcontrolsystemsFeatures:Onlythereisaforwardactionfromtheinputtotheoutput.Chapter1In

7、troduction2)Closedloop(feedback)controlsystemsFeatures:1)measuringtheoutput(controlledvariable).2)Feedback.notonlythereisaforwardaction,alsoabackwardactionbetweentheoutputandtheinput(measuringtheoutputandcomparingitwiththeinput).Chapter1IntroductionNotes:1)P

8、ositivefeedback;2)Negativefeedback—Feedback.1.3typesofcontrolsystems1)linearsystemsversusNonlinearsystems.2)Time-invariantsystemsvs.Time-varyingsystems.3)Continuoussystemsvs.Discrete(data)system