自动控制基础智慧树知到答案2024年同济大学

自动控制基础同济大学智慧树知到答案2024年第一章测试

Aboutthepositivefeedbackcontrolsystem,whichoneofthefollowingiscorrect?（）

A:Thereisnopositivefeedbackcontrolsysteminthephysicalworld.B:Thereispositivefeedbackcontrolsysteminthephysicalworld.C:Idon’tknow

答案:BTherepresentativefigureinthehistoryofclassicalcontroltheoryincludes.（）

A:H.S.BlackB:HarryNyquistC:JamesClerkMaxwellD:H.W.Bode

答案:ABCDInthefollowingutilities,theclosed-loopsystemsinclude（）.

A:AirconditionerB:MicrowaveovenC:WashingmachineD:Vanelevator

答案:ADThetrendofcontroldevelopmentis（）.

A:Highautonomy,HighflexibilityB:Lowautonomy,LowflexibilityC:Highautonomy,LowflexibilityD:Lowautonomy,Highflexibility

答案:AAsystemwithmorethanoneinputvariableormorethanoneoutputvariableisknownbywhatname?（）

A:Closed-loopfeedbacksystemB:MultivariablecontrolsystemC:Open-loopfeedbacksystemD:Robustcontrolsystem

答案:B

第二章测试

Considerthedifferentialequation,whereandisaunitstep.Thepolesofthissystemare（）.

A:B:C:D:None

答案:CThemathematicalfoundationofclassicalcontroltheoryincludes（）.

A:Differentialequation.B:LaplacetransformationC:All

theoptions.D:Fouriertransformation

答案:CWhichofthefollowingstatementsisNOT对?（）

A:Whendealingwithtransferfunctions,theinitialconditionsareassumedtobenonzero.B:Transferfunctionmodelpermitseasyinterconnectionofphysicalsystems.C:Laplacetransformationturnsthesolutionofdifferentialequationsintoalgebraicmanipulations.D:Thetransferfunctioncanbeappliedtolineartime-invariantsystem.

答案:AAcartofmassm=1000kgisattachedtoatruckusingaspringofstiffnessk=20,000N/mandadamperofconstantb=200Ns/m,asshowninthefollowingfigure.Thetruckmovesataconstantaccelerationofa=0.7m/.Thetransferfunctionbetweenthespeedofthetruckandthespeedofthecartis（）.

A:T(s)=B:T(s)=C:T(s)=D:Noneoftheabove

答案:CThes-planeplotofthepolesandzerosgraphicallyportraysthecharacterofthenaturalresponseofasystem.（）

A:错B:对

答案:B

第三章测试

Considerasecond-orderunderdampedsystem.Ifincreasesmeanwhileiskeptconstant,then（）.

A:therisetimeandthepeaktimewillreduce.B:therisetimeandthesettlingtimewillincrease.C:therisetimeandtheovershootwillreduce.D:therisetimeandthepeaktimewillincrease.

答案:AConsiderasecond-ordersystemwiththetransferfunction.Thenthesystemis（）.

A:criticaldampedB:underdampedC:overdampedD:zerodamped

答案:BConsideraunitynegativefeedbacksystem.Thesteady-stateerrorforarampinputisaconstantwithnonzerovalue.Thentheopensystemis（）.

A:atype-onesystemB:atype-threesystemC:atype-zerosystemD:atype-twosystem

答案:AAsystemhastheclosed-looptransferfunctionT(s)givenby.Usingthenotionofdominantpoles,estimatetheexpectedpercentovershoot.（）

A:P.O.≈50%B:P.O.≈20%C:P.O.≈5%D:Noovershootexpected

答案:BTheoptimumcontrolsystemisasystemwhoseparametersareadjustedsothattheperformanceindexreachesanextremumvalue.（）

A:对B:错

答案:A

第四章测试

Aboutthefeedbackincontrolsystems,whichisthebestdescription?（）

A:ThefeedbackcanreducethesensitivityofthesystemstochangesintheplantparametersB:Thefeedbackcanimprovethetrackingofreferenceinput.C:Thefeedbackcanimprovetheregulationagainstdisturbances.D:Allotheroptions

答案:DConsidertheclosed-looptransferfunction,whereA1,A2,A3andA4areconstants.ComputethesensitivityofthesystemtovariationsintheparameterK.（）

A:B:C:D:

答案:AComplexityisameasureofthestructure,intricateness,orbehaviorofasystemthatcharacterizestherelationshipsandinteractionsbetweenvariouscomponents.（）

A:对B:错

答案:ALossofgainreferstoareductionintheamplitudeoftheratiooftheoutputsignaltotheinputsignalthroughasystem,usuallymeasuredindecibels.（）

A:错B:对

答案:BTheregulationoffeedbackcontrolworksatthesametimethatdisturbancesactonasystem.（）

A:错B:对

答案:A

第五章测试

TheRouth-Hurwitzcriterionrevealsthestabilityincasesof（）.

A:repeatedclosed-looppoleslyingontheimaginaryaxis.B:allotheroptionsC:alltheclose-looppoleslyingintheleft-hands-plane.D:singleclosed-looppolelyingontheimaginaryaxis.

答案:CDWhenusingtheRouthcriterion,anall-zerorowintheRoutharraymeansthesystemis（）atbest.

A:stableB:uncertainC:criticallystableD:unstable

答案:CTheclosed-loopcharacteristicequationofasystemis,howmanyunstableclosed-loopsystemarethereintheright-halfclosed-looppoles?（）

A:3B:1C:2D:0

答案:CTheparametersofasystemchangedalittleafteralong-termuse,andtheminimumclosed-looppolemoves0.5totheright,thestabilityofthissystemwill（）.

A:becomebiggerB:becomesmallerC:remainthesame

答案:BWhenwedeterminethestabilityofasystemwiththefollowingmethods,whichonesareequivalent?（）

A:Bounded-inputbounded-outputB:Routh-HurwitzcriterionC:Theclosed-looppoles

答案:BC

第六章测试

Rootlocusprovidesussomeinstructionstoadjusttheparameterstomaketheperformanceofthissystemsatisfied.（）

A:错B:对

答案:BWhentherootlocusofa2ndordersystemisgiven,wecanget（）fromit.

A:SteadystateerrorB:StabilityC:SettingtimeD:Percentovershoot

答案:BCDConsideraunityfeedbackcontrolsystem,itsopen-looptransferfunctionis.Whichoneiscorrectinthefollowingstatementsconcerningtherootlocusofthissystem?（）

A:Thereisnobreakpoint.B:AlltheasymptotesintersectatC:ThesystemisstablewhenD:asegmentofrootlocuslocatesontherealaxis

答案:BCDAbouttherootlocusofanegativefeedbackcontrolsystem,whichofthefollowingis对?（）

A:Therootlociaresymmetricalwithrespecttotherealaxis.B:Therootlocusontherealaxisalwaysliesinasectionoftherealaxistotheleftofanevennumberofpolesandzeros.C:Thelocibeginatthezerosandendatthepoles.D:Thenumberofseparatelociisequaltothenumberoffinitezeros.

答案:AForanegativefeedbackcontrolsystemwiththegainbeingnegative,thesegmentsoftherootlocuslocatetotheleftoftheoddopen-looppolesandzeros.（）

A:对B:错

答案:B

第七章测试

Abridgeisdescribedbyasecond-ordertransferfunction.Andatroopisgoingtopassthroughthisbridge.Inordertopreventthebridgefrombeingbrokendowncausedbyresonantvibration,Thepaceofthistroopshouldbe（）.

A:Greaterthan10B:Equalsto100C:Lessthan100D:Equalsto10

答案:ABTheclosed-loopfrequencyresponsecharacteristicofasystemisshowninthefollowingtable.Whenthissystemisexcitedbyasinusoidalsignal,thecorrespondingsteadystateoutputresponseofthissystemis（）.

0.532040(dB)200dB-25-28-108-120-135-160

A:B:C:D:

答案:BConsideranelement.Whenthefrequency,thephaseofis（）.

A:90°B:

C:-90°D:-45°

答案:BOneadvantageofthefrequencyresponsemethodisthereadyavailabilityofsinusoidtestsignalsforvariousrangesoffrequenciesandamplitudes.（）

A:错B:对

答案:BPolarplotismoreconvenientwhendescribingthefrequencyresponseofasystemthanBodediagramandallowustohaveaninsightintothecomponentscomposedofthissystem.（）

A:错B:对

答案:B

第八章测试

Givenanopenlooptransferfunction,thephasemarginisapproximately（）

A:infinityB:20degreesC:5degreesD:10degrees

答案:DTheNyquiststabilitycriterionisusedtodeterminewhetherthereare（）ontherighthalfofthes-plane.

A:openlooppolesB:polesofthecharacteristicpolynomialoftheclosedlooptransferfunctionC:zerosofthecharacteristicpolynomialoftheclosedlooptransferfunctionD:closedloopzeros

答案:CSystemwithhigherbandwidthhasbetterabilitytotracktheinputsignal,andhasbetterperformanceonreducinghigh-frequencynoise.（）

A:对B:错

答案:BConsideraminimumphasesystem.Thehigheritsopen-loopgainis（）.

A:thelessitsphasechangeisB:thesmalleritssteady-stateerrorisC:thelargeritsstabilitymarginisD:themorethenumberofoscillationis

答案:BTheNyquistcurveofa1storderphase-leadnetworkis（）

A:TheupperhalfcircleB:ThelowerhalfcircleC:45degreesarcD:Circle

答案:A

第九章测试

Whendebuggingtheclosed-loopsystem,theopen-loopgainofthesystemwasgraduallyincreased.Itwasfoundthatthecontrolprecisionofthesystemwasnotgoodwhenthespeedandstabilitymetthedesignrequirements.Whichofthefollowingmeasuresshouldbetaken?（）

A:Continuetoincreasetheopen-loopgainB:Adoptphase-lagcompensatorC:Adoptphase-leadcompensatorD:Adoptlead-lagcompensator

答案:BForfrequencydomaincompensation,whichoneisNOTcorrect.（）

A:Foropen-loopfrequencycharacteristic,thegradientofthelogmagnitude-frequencycharacteristicatmid-frequencyshould