自動控制基礎智慧樹知到課后章節(jié)答案2023年下同濟大學

自動控制基礎智慧樹知到課后章節(jié)答案2023年下同濟大學同濟大學

第一章測試

Aboutthepositivefeedbackcontrolsystem,whichoneofthefollowingiscorrect?（）

A:Thereisnopositivefeedbackcontrolsysteminthephysicalworld.B:Idon’tknowC:Thereispositivefeedbackcontrolsysteminthephysicalworld.

答案:Thereispositivefeedbackcontrolsysteminthephysicalworld.

Therepresentativefigureinthehistoryofclassicalcontroltheoryincludes.（）

A:JamesClerkMaxwellB:H.S.BlackC:HarryNyquistD:H.W.Bode

答案:JamesClerkMaxwell;H.S.Black;HarryNyquist;H.W.Bode

Inthefollowingutilities,theclosed-loopsystemsinclude（）.

A:VanelevatorB:MicrowaveovenC:WashingmachineD:Airconditioner

答案:Vanelevator;Airconditioner

Thetrendofcontroldevelopmentis（）.

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

答案:Highautonomy,Highflexibility

Asystemwithmorethanoneinputvariableormorethanoneoutputvariableisknownbywhatname?（）

A:Open-loopfeedbacksystemB:Closed-loopfeedbacksystemC:MultivariablecontrolsystemD:Robustcontrolsystem

答案:Multivariablecontrolsystem

第二章測試

Considerthedifferentialequation,whereandisaunitstep.Thepolesofthissystemare（）.

A:B:C:None

D:

答案:

Themathematicalfoundationofclassicalcontroltheoryincludes（）.

A:All

theoptions.B:LaplacetransformationC:Differentialequation.D:Fouriertransformation

答案:All

theoptions.

WhichofthefollowingstatementsisNOT對?（）

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

答案:Whendealingwithtransferfunctions,theinitialconditionsareassumedtobenonzero.

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

A:T(s)=B:T(s)=C:NoneoftheaboveD:T(s)=

答案:T(s)=

Thes-planeplotofthepolesandzerosgraphicallyportraysthecharacterofthenaturalresponseofasystem.（）

A:對B:錯

答案:對

第三章測試

Considerasecond-orderunderdampedsystem.Ifincreasesmeanwhileiskeptconstant,then（）.

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

答案:therisetimeandthepeaktimewillreduce.

Considerasecond-ordersystemwiththetransferfunction.Thenthesystemis（）.

A:zerodampedB:criticaldampedC:overdampedD:underdamped

答案:underdamped

Consideraunitynegativefeedbacksystem.Thesteady-stateerrorforarampinputisaconstantwithnonzerovalue.Thentheopensystemis（）.

A:atype-zerosystemB:atype-threesystemC:atype-twosystemD:atype-onesystem

答案:atype-onesystem

Asystemhastheclosed-looptransferfunctionT(s)givenby.Usingthenotionofdominantpoles,estimatetheexpectedpercentovershoot.（）

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

答案:P.O.≈20%

Theoptimumcontrolsystemisasystemwhoseparametersareadjustedsothattheperformanceindexreachesanextremumvalue.（）

A:對B:錯

答案:對

第四章測試

Aboutthefeedbackincontrolsystems,whichisthebestdescription?（）

A:Thefeedbackcanimprovethetrackingofreferenceinput.B:ThefeedbackcanreducethesensitivityofthesystemstochangesintheplantparametersC:Thefeedbackcanimprovetheregulationagainstdisturbances.D:Allotheroptions

答案:Allotheroptions

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

A:B:C:D:

答案:

Complexityisameasureofthestructure,intricateness,orbehaviorofasystemthatcharacterizestherelationshipsandinteractionsbetweenvariouscomponents.（）

A:錯B:對

答案:對

Lossofgainreferstoareductionintheamplitudeoftheratiooftheoutputsignaltotheinputsignalthroughasystem,usuallymeasuredindecibels.（）

A:錯B:對

答案:對

Theregulationoffeedbackcontrolworksatthesametimethatdisturbancesactonasystem.（）

A:錯B:對

答案:錯

第五章測試

TheRouth-Hurwitzcriterionrevealsthestabilityincasesof（）.

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

答案:alltheclose-looppoleslyingintheleft-hands-plane.;singleclosed-looppolelyingontheimaginaryaxis.

WhenusingtheRouthcriterion,anall-zerorowintheRoutharraymeansthesystemis（）atbest.

A:stableB:unstableC:uncertainD:criticallystable

答案:criticallystable

Theclosed-loopcharacteristicequationofasystemis,howmanyunstableclosed-loopsystemarethereintheright-halfclosed-looppoles?（）

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

答案:2

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

A:becomesmallerB:becomebiggerC:remainthesame

答案:becomesmaller

Whenwedeterminethestabilityofasystemwiththefollowingmethods,whichonesareequivalent?（）

A:Routh-HurwitzcriterionB:Bounded-inputbounded-outputC:Theclosed-looppoles

答案:Routh-Hurwitzcriterion;Theclosed-looppoles

第六章測試

Rootlocusprovidesussomeinstructionstoadjusttheparameterstomaketheperformanceofthissystemsatisfied.（）

A:對B:錯

答案:對

Whentherootlocusofa2ndordersystemisgiven,wecanget（）fromit.

A:PercentovershootB:SteadystateerrorC:SettingtimeD:Stability

答案:Percentovershoot;Settingtime;Stability

Consideraunityfeedbackcontrolsystem,itsopen-looptransferfunctionis.Whichoneiscorrectinthefollowingstatementsconcerningtherootlocusofthissystem?（）

A:Thereisnobreakpoint.B:AlltheasymptotesintersectatC:asegmentofrootlocuslocatesontherealaxisD:Thesystemisstablewhen

答案:Alltheasymptotesintersectat;asegmentofrootlocuslocatesontherealaxis;Thesystemisstablewhen

Abouttherootlocusofanegativefeedbackcontrolsystem,whichofthefollowingis對?（）

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

答案:Therootlociaresymmetricalwithrespecttotherealaxis.

Foranegativefeedbackcontrolsystemwiththegainbeingnegative,thesegmentsoftherootlocuslocatetotheleftoftheoddopen-looppolesandzeros.（）

A:錯B:對

答案:錯

第七章測試

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

A:Greaterthan10B:Equalsto10C:Equalsto100D:Lessthan100

答案:Greaterthan10;Equalsto100

Theclosed-loopfrequencyresponsecharacteristicofasystemisshowninthefollowingtable.Whenthissystemisexcitedbyasinusoidalsignal,thecorrespondingsteadystateoutputresponseofthissystemis（）.

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

A:B:C:D:

答案:

Consideranelement.Whenthefrequency,thephaseofis（）.

A:-45°B:90°C:-90°D:

答案:

Oneadvantageofthefrequencyresponsemethodisthereadyavailabilityofsinusoidtestsignalsforvariousrangesoffrequenciesandamplitudes.（）

A:錯B:對

答案:對

PolarplotismoreconvenientwhendescribingthefrequencyresponseofasystemthanBodediagramandallowustohaveaninsightintothecomponentscomposedofthissystem.（）

A:對B:錯

答案:對

第八章測試

Givenanopenlooptransferfunction,thephasemarginisapproximately（）

A:5degreesB:infinityC:20degreesD:10degrees

答案:10degrees

TheNyquiststabilitycriterionisusedtodeterminewhetherthereare（）ontherighthalfofthes-plane.

A:closedloopzerosB:polesofthecharacteristicpolynomialoftheclosedlooptransferfunctionC:openlooppolesD:zerosofthecharacteristicpolynomialoftheclosedlooptransferfunction

答案:zerosofthecharacteristicpolynomialoftheclosedlooptransferfunction

Systemwithhigherbandwidthhasbetterabilitytotracktheinputsignal,andhasbetterperformanceonreducinghigh-frequencynoise.（）

A:對B:錯

答案:錯

Consideraminimumphasesystem.Thehigheritsopen-loopgainis（）.

A:thesmalleritssteady-stateerrorisB:thelessitsphasechangeisC:themorethenumberofoscillationisD:thelargeritsstabilitymarginis

答案:thesmalleritssteady-stateerroris

TheNyquistcurveofa1storderphase-leadnetworkis（）

A:45degreesarcB:ThelowerhalfcircleC:CircleD:Theupperhalfcircle

答案:Theupperhalfcircle

第九章測試

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

A:Adoptphase-leadcompensatorB:Adoptphase-lagcompensatorC:Continuetoincreasetheopen-loopgainD:Adoptlead-lagcompensator

答案:Adoptphase-lagcompensator

Forfrequencydomaincompensation,whichoneisNOTcorrect.（）

A:Thephasemarginshouldbeabout45degreesforareasonablydesignedsystem.B:Atlowfrequency,theopen-loopgainismainlydecidedbythesystemdynamicperforma