自动控制基础知到章节答案智慧树2023年同济大学

自动控制基础知到章节测试答案智慧树2023年最新同济大学第一章测试

Aboutthepositivefeedbackcontrolsystem,whichoneofthefollowingiscorrect?（）

参考答案:

Thereispositivefeedbackcontrolsysteminthephysicalworld.

Therepresentativefigureinthehistoryofclassicalcontroltheoryincludes.（）

参考答案:

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

Inthefollowingutilities,theclosed-loopsystemsinclude（）.

参考答案:

Vanelevator;Airconditioner

Thetrendofcontroldevelopmentis（）.

参考答案:

Highautonomy,Highflexibility

Asystemwithmorethanoneinputvariableormorethanoneoutputvariableisknownbywhatname?（）

参考答案:

Multivariablecontrolsystem

第二章测试

Considerthedifferentialequation,whereandisaunitstep.Thepolesofthissystemare（）.

参考答案:

Themathematicalfoundationofclassicalcontroltheoryincludes（）.

参考答案:

All

theoptions.

WhichofthefollowingstatementsisNOT对?（）

参考答案:

Whendealingwithtransferfunctions,theinitialconditionsareassumedtobenonzero.

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

参考答案:

T(s)=

Thes-planeplotofthepolesandzerosgraphicallyportraysthecharacterofthenaturalresponseofasystem.（）

参考答案:

对

第三章测试

Considerasecond-orderunderdampedsystem.Ifincreasesmeanwhileiskeptconstant,then（）.

参考答案:

therisetimeandthepeaktimewillreduce.

Considerasecond-ordersystemwiththetransferfunction.Thenthesystemis（）.

参考答案:

underdamped

Consideraunitynegativefeedbacksystem.Thesteady-stateerrorforarampinputisaconstantwithnonzerovalue.Thentheopensystemis（）.

参考答案:

atype-onesystem

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

参考答案:

P.O.≈20%

Theoptimumcontrolsystemisasystemwhoseparametersareadjustedsothattheperformanceindexreachesanextremumvalue.（）

参考答案:

对

第四章测试

Aboutthefeedbackincontrolsystems,whichisthebestdescription?（）

参考答案:

Allotheroptions

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

参考答案:

Complexityisameasureofthestructure,intricateness,orbehaviorofasystemthatcharacterizestherelationshipsandinteractionsbetweenvariouscomponents.（）

参考答案:

对

Lossofgainreferstoareductionintheamplitudeoftheratiooftheoutputsignaltotheinputsignalthroughasystem,usuallymeasuredindecibels.（）

参考答案:

对

Theregulationoffeedbackcontrolworksatthesametimethatdisturbancesactonasystem.（）

参考答案:

错

第五章测试

TheRouth-Hurwitzcriterionrevealsthestabilityincasesof（）.

参考答案:

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

WhenusingtheRouthcriterion,anall-zerorowintheRoutharraymeansthesystemis（）atbest.

参考答案:

criticallystable

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

参考答案:

2

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

参考答案:

becomesmaller

Whenwedeterminethestabilityofasystemwiththefollowingmethods,whichonesareequivalent?（）

参考答案:

Theclosed-looppoles;Routh-Hurwitzcriterion

第六章测试

Rootlocusprovidesussomeinstructionstoadjusttheparameterstomaketheperformanceofthissystemsatisfied.（）

参考答案:

对

Whentherootlocusofa2ndordersystemisgiven,wecanget（）fromit.

参考答案:

Stability;Settingtime;Percentovershoot

Consideraunityfeedbackcontrolsystem,itsopen-looptransferfunctionis.Whichoneiscorrectinthefollowingstatementsconcerningtherootlocusofthissystem?（）

参考答案:

asegmentofrootlocuslocatesontherealaxis;Thesystemisstablewhen;Alltheasymptotesintersectat

Abouttherootlocusofanegativefeedbackcontrolsystem,whichofthefollowingis对?（）

参考答案:

Therootlociaresymmetricalwithrespecttotherealaxis.

Foranegativefeedbackcontrolsystemwiththegainbeingnegative,thesegmentsoftherootlocuslocatetotheleftoftheoddopen-looppolesandzeros.（）

参考答案:

错

第七章测试

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

参考答案:

Equalsto100;Greaterthan10

Theclosed-loopfrequencyresponsecharacteristicofasystemisshowninthefollowingtable.Whenthissystemisexcitedbyasinusoidalsignal,thecorrespondingsteadystateoutputresponseofthissystemis（）.

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

参考答案:

Consideranelement.Whenthefrequency,thephaseofis（）.

参考答案:

Oneadvantageofthefrequencyresponsemethodisthereadyavailabilityofsinusoidtestsignalsforvariousrangesoffrequenciesandamplitudes.（）

参考答案:

对

PolarplotismoreconvenientwhendescribingthefrequencyresponseofasystemthanBodediagramandallowustohaveaninsightintothecomponentscomposedofthissystem.（）

参考答案:

对

第八章测试

Givenanopenlooptransferfunction,thephasemarginisapproximately（）

参考答案:

10degrees

TheNyquiststabilitycriterionisusedtodeterminewhetherthereare（）ontherighthalfofthes-plane.

参考答案:

zerosofthecharacteristicpolynomialoftheclosedlooptransferfunction

Systemwithhigherbandwidthhasbetterabilitytotracktheinputsignal,andhasbetterperformanceonreducinghigh-frequencynoise.（）

参考答案:

错

Consideraminimumphasesystem.Thehigheritsopen-loopgainis（）.

参考答案:

thesmalleritssteady-stateerroris

TheNyquistcurveofa1storderphase-leadnetworkis（）

参考答案:

Theupperhalfcircle

第九章测试

Whendebuggingtheclosed-loopsystem,theopen-loopgainofthesystemwasgraduallyincreased.Itwasfoundthatthecontrolprecisionofthesystemwasnotgoodwhenthespeedandstabilitymetthedesignrequirements.Whichofthefollowing