自动控制基础知到智慧树章节测试课后答案2024年秋同济大学

自动控制基础知到智慧树章节测试课后答案2024年秋同济大学第一章单元测试

Aboutthepositivefeedbackcontrolsystem,whichoneofthefollowingiscorrect?（）

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

答案:Thereispositivefeedbackcontrolsysteminthephysicalworld.Therepresentativefigureinthehistoryofclassicalcontroltheoryincludes.（）

A:HarryNyquistB:H.S.BlackC:JamesClerkMaxwellD:H.W.Bode

答案:HarryNyquist；H.S.Black；JamesClerkMaxwell；H.W.BodeInthefollowingutilities,theclosed-loopsystemsinclude（）.

A:WashingmachineB:VanelevatorC:AirconditionerD:Microwaveoven

答案:Vanelevator；AirconditionerThetrendofcontroldevelopmentis（）.

A:Lowautonomy,HighflexibilityB:Highautonomy,HighflexibilityC:Highautonomy,LowflexibilityD:Lowautonomy,Lowflexibility

答案:Highautonomy,HighflexibilityAsystemwithmorethanoneinputvariableormorethanoneoutputvariableisknownbywhatname?（）

A:Open-loopfeedbacksystemB:RobustcontrolsystemC:Closed-loopfeedbacksystemD:Multivariablecontrolsystem

答案:Multivariablecontrolsystem

第二章单元测试

Considerthedifferentialequation,whereandisaunitstep.Thepolesofthissystemare（）.

A:B:None

C:D:

答案:Themathematicalfoundationofclassicalcontroltheoryincludes（）.

A:All

theoptions.B:Differentialequation.C:LaplacetransformationD:Fouriertransformation

答案:All

theoptions.WhichofthefollowingstatementsisNOT对?（）

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

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

A:NoneoftheaboveB:T(s)=C:T(s)=D:T(s)=

答案:T(s)=Thes-planeplotofthepolesandzerosgraphicallyportraysthecharacterofthenaturalresponseofasystem.（）

A:对B:错

答案:对

第三章单元测试

Considerasecond-orderunderdampedsystem.Ifincreasesmeanwhileiskeptconstant,then（）.

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

答案:therisetimeandthepeaktimewillreduce.Considerasecond-ordersystemwiththetransferfunction.Thenthesystemis（）.

A:overdampedB:zerodampedC:criticaldampedD:underdamped

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

A:atype-onesystemB:atype-zerosystemC:atype-threesystemD:atype-twosystem

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

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

答案:P.O.≈20%Theoptimumcontrolsystemisasystemwhoseparametersareadjustedsothattheperformanceindexreachesanextremumvalue.（）

A:错B:对

答案:对

第四章单元测试

Aboutthefeedbackincontrolsystems,whichisthebestdescription?（）

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

答案:Allotheroptions

Considertheclosed-looptransferfunction,whereA1,A2,A3andA4areconstants.ComputethesensitivityofthesystemtovariationsintheparameterK.（）

A:B:C:D:

答案:Complexityisameasureofthestructure,intricateness,orbehaviorofasystemthatcharacterizestherelationshipsandinteractionsbetweenvariouscomponents.（）

A:对B:错

答案:对Lossofgainreferstoareductionintheamplitudeoftheratiooftheoutputsignaltotheinputsignalthroughasystem,usuallymeasuredindecibels.（）

A:错B:对

答案:对Theregulationoffeedbackcontrolworksatthesametimethatdisturbancesactonasystem.（）

A:对B:错

答案:错

第五章单元测试

TheRouth-Hurwitzcriterionrevealsthestabilityincasesof（）.

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

答案:singleclosed-looppolelyingontheimaginaryaxis.；alltheclose-looppoleslyingintheleft-hands-plane.WhenusingtheRouthcriterion,anall-zerorowintheRoutharraymeansthesystemis（）atbest.

A:uncertainB:stableC:criticallystableD:unstable

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

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

答案:2Theparametersofasystemchangedalittleafteralong-termuse,andtheminimumclosed-looppolemoves0.5totheright,thestabilityofthissystemwill（）.

A:becomesmallerB:remainthesameC:becomebigger

答案:becomesmallerWhenwedeterminethestabilityofasystemwiththefollowingmethods,whichonesareequivalent?（）

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

答案:Routh-Hurwitzcriterion；Theclosed-looppoles

第六章单元测试

Rootlocusprovidesussomeinstructionstoadjusttheparameterstomaketheperformanceofthissystemsatisfied.（）

A:错B:对

答案:对Whentherootlocusofa2ndordersystemisgiven,wecanget（）fromit.

A:StabilityB:SettingtimeC:PercentovershootD:Steadystateerror

答案:Stability；Settingtime；PercentovershootConsideraunityfeedbackcontrolsystem,itsopen-looptransferfunctionis.Whichoneiscorrectinthefollowingstatementsconcerningtherootlocusofthissystem?（）

A:asegmentofrootlocuslocatesontherealaxisB:Thereisnobreakpoint.C:ThesystemisstablewhenD:Alltheasymptotesintersectat

答案:asegmentofrootlocuslocatesontherealaxis；Thesystemisstablewhen；AlltheasymptotesintersectatAbouttherootlocusofanegativefeedbackcontrolsystem,whichofthefollowingis对?（）

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

答案:Therootlociaresymmetricalwithrespecttotherealaxis.Foranegativefeedbackcontrolsystemwiththegainbeingnegative,thesegmentsoftherootlocuslocatetotheleftoftheoddopen-looppolesandzeros.（）

A:错B:对

答案:错

第七章单元测试

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

A:Greaterthan10B:Lessthan100C:Equalsto10D:Equalsto100

答案:Greaterthan10；Equalsto100Theclosed-loopfrequencyresponsecharacteristicofasystemisshowninthefollowingtable.Whenthissystemisexcitedbyasinusoidalsignal,thecorrespondingsteadystateoutputresponseofthissystemis（）.

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

A:B:C:D:

答案:Consideranelement.Whenthefrequency,thephaseofis（）.

A:90°B:-90°C:-45°D:

答案:

Oneadvantageofthefrequencyresponsemethodisthereadyavailabilityofsinusoidtestsignalsforvariousrangesoffrequenciesandamplitudes.（）

A:错B:对

答案:对PolarplotismoreconvenientwhendescribingthefrequencyresponseofasystemthanBodediagramandallowustohaveaninsightintothecomponentscomposedofthissystem.（）

A:对B:错

答案:对

第八章单元测试

Givenanopenlooptransferfunction,thephasemarginisapproximately（）

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

答案:10degreesTheNyquiststabilitycriterionisusedtodeterminewhetherthereare（）ontherighthalfofthes-plane.

A:closedloopzerosB:polesofthecharacteristicpolynomialoftheclosedlooptransferfunctionC:zerosofthecharacteristicpolynomialoftheclosedlooptransferfunctionD:openlooppoles

答案:zerosofthecharacteristicpolynomialoftheclosedlooptransferfunctionSystemwithhigherbandwidthhasbetterabilitytotracktheinputsignal,andhasbetterperformanceonreducinghigh-frequencynoise.（）

A:对B:错

答案:错Consideraminimumphasesystem.Thehigheritsopen-loopgainis（）.

A:themorethenumberofoscillationisB:thelessitsphasechangeisC:thelargeritsstabilitymarginisD:thesmalleritssteady-stateerroris

答案:thesmalleritssteady-stateerrorisTheNyquistcurveofa1storderphase-leadnetworkis（）

A:ThelowerhalfcircleB:TheupperhalfcircleC:CircleD:45degreesarc

答案:Theupperhalfcircle

第九章单元测试

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

A:Continuetoincreasetheopen-loopgainB:Adoptphase-leadcompensatorC:Adoptlead-lagcompensatorD:Adoptphase-lagcompensator

答案:Adoptphase-lagcompensatorForfrequencydomaincompensation,whichoneisNOTcorrect.（）

A:Forphaseleadcompensator,thephaseleadangleisemployedtocompensateforthesystem.B:Foropen-loopfrequencycharacteristic,thegradientofthelogmagnitude