自动控制基础智慧树知到期末考试答案章节答案2024年同济大学

自动控制基础智慧树知到期末考试答案+章节答案2024年同济大学Thesystemsensitivityistheratioofthechangeinthesystemtransferfunctiontothechangeofaprocesstransferfunctionforasmallincrementalchange.（）

答案:对Feedbackcontrolcanincreasethestabilitydegree.（）

答案:错TheRouth-Hurwitzcriteriondescribesthedegreeofstabilityofalinearcontrolsystem.（）

答案:错Unitimpulseisatestinputconsistingofanimpulseofinfiniteamplitudeandzerowidth,andhavinganareaofunity.（）

答案:对Aconformalmappingisamappingthatretainstheanglesonthes-planeonthetransformedF(s)-plane.（）

答案:错Twodifferentsystemscanbecomposedofthesamecomponents.（）

答案:对Oneofthemostimportantcharacteristicsofcontrolsystemsistheirtransientresponse.（）

答案:对Whenwesketchtherootlocus,theangleconditionsatisfiedbyaminimum-phasesystemisthesameasthatbyanon-minimumsystem.（）

答案:错Therootlocusisthepaththerootsofthecharacteristicequation(givenby1+KG(s)=0)traceoutonthes-planeasthesystemparameter0≤K<∞varies.（）

答案:对Nyquiststabilitycriterionusestheclosed-looptransferfunctiontodeterminewhetherthecorrespondingsystemisstable.（）

答案:错Feedbackcontrolhassomeattractingadvantagesaswellassomeindispensabledisadvantages.Inpractice,theeffectofdisadvantagesshouldbekepttobetheminimumwhenwemakeuseoftheadvantages.（）

答案:对Engineeringsynthesisandengineeringanalysisarethesame.（）

答案:错Anadvantageofusingfeedbackisadecreasedsensitivityofthesystemtovariationsintheparametersoftheprocess.（）

答案:对Controlcanonlybeappliedtoindustrialprocess.（）

答案:错Thephase-leadnetworkprovidesanattenuationandincreasesthesteady-stateerrorconstant.（）

答案:错

答案:Thedistancefromobstaclesismeasuredbytheinfraredsensors.###Thecontrolsystemisabletoputthevacuumcleaneronanoptimalpathtoreachtheentirefloor.###Thereferenceinputisthedesireddistancefromobstacles.Considerarealnegativefeedbackcontrolsystem,whichstatementiscorrect?（）

答案:Thecomponentsinthefeedforwardpathcanbelessreliable.###Thecomponentsinthefeedbackpathmustbehighlyreliable.Whataretheeffectsofphase-leadnetwork?（）

答案:decreasesettlingtime###increasebandwidth###speeduptransientresponseMathematicalmodelhasbroadapplication,().（）

答案:Itcanbeusedtoprovideakindofoptimalplanningscheme.###Itcanbeusedtorevealthemechanismofaprocess.###Itcanbeusedtoforecastthetrendofavariableinfuture.InthefollowingstatementsconcerningQuarteramplitudeDecay,whichoneiscorrect?（）

答案:Smalleffectonthesystem###Theamplitudeoftheclosed-loopresponseisreducedapproximatelytoone-fourthofthemaximumvalueinoneoscillatoryperiod.###Theamplitudeoftheclosed-loopresponseisreducedapproximatelytoonehalfofthemaximumvalueinoneoscillatoryperiod.Whatinformationcanwereadfromarootlocus?（）

答案:Specificgain###Dampingratio###Stability###Naturalfrequency

答案:Itisaleadcompensator.###Itisahighpassfilter.Whatistheprincipaleffectofaleadcompensationonarootlocus?（）

答案:causethelocusbendtowardtheleft-halfplane.###movethedominantrootstoaplaceofhigherdampingInthefollowingstatementsconcerningtransferfunction,whichoneiscorrect?（）

答案:Underzeroinitialconditions,transferfunctionanddifferentialequationcanbetransformedeachother.###Transferfunctionisusuallyarationalproperfractionofthecomplexvariables.###Transferfunctionisrelatedtothestructureandparametersofasystem.

答案:

答案:15/4Acontrolsystemisdeficientinbothphasemarginandbandwidth,theappropriatecompensatorneededshouldbe().（）

答案:Phase-leadcompensator

答案:theparameterT

答案:

答案:Unstable

答案:K＜260.68SupposethatonedesignspecificationforanegativefeedbackcontrolsystemrequiresthatthepercentovershoottoastepinputbeP.O.≤10%.Thecorrespondingspecificationinthefrequencydomainis().（）

答案:Importantmodernapplicationsofcontrolsystemsincludewhichofthefollowing?（）

答案:All

otheroptions

答案:0.5

答案:K=2.15

答案:System1

答案:K=2025

答案:Atlowfrequency:slope=0dB/decadeandathighfrequency:slope=-40dB/decade

答案:10degreesSometermsandtheirexplanationaregiveninthefollowingtable.Whichmatchiscorrect?（）(T1)Actuator(E1)Anunwantedinputsignalthataffectsthemeasuredoutputsignal.(T2)Sensor(E2)Adeviceemployedbythecontrolsystemtoalteroradjusttheenvironment.(T3)Mechatronics(E3)MechatronicsThesynergisticintegrationofmechanical,electrical,andcomputersystems(T4)Measurementnoise(E4)Adevicethatprovidesameasurementofadesiredexternalsignal

答案:T1—E2,T2—E4,T3—E3,T4—E1Thetorquesensorcanmeasurewhichoneofthefollowingphysicalvariables?（）

答案:TorqueForasecond-ordersystem,whichofthefollowingwilldecreasewhenthedampingratioisincreased?（）

答案:Settlingtime

答案:Aftertherootlocusofaclosed-loopcontrolsystemisdetermined,ifweaddazerototheopen-looptransferfunction,therootlocuswill().（）

答案:Movefromrighttoleft

答案:Type-IInthefollowingstatementsconcerningthestepresponseof1st-ordersystem,whichoneiscorrect?（）

答案:NoovershootRootswithhighermultiplicityontheimaginaryaxismakesthesystem().（）

答案:Unstable

答案:onerealpoleandconstant

答案:Theclosed-loopsystemisstable.TheNyquiststabilitycriterionisusedtodeterminewhetherthereare()ontherighthalfofthes-plane.（）

答案:zerosofthecharacteristicpolynomialoftheclosedlooptransferfunction

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

答案:Adoptphase-lagcompensatorForPIDcontroller,theintegralpartshouldworkon（）toimprovethesteadystateperformance,andthedifferentialpartshouldworkon（）toimprovethedynamicperformance.

答案:low-frequencypart,mid-frequencypartForfrequencydomaincompensation,whichoneisNOTcorrect.（）

答案:Atlowfrequency,theopen-loopgainismainlydecidedbythesystemdynamicperformance.Whatisnotthefeatureofaphase-lagcompensator?（）

答案:TobendtherootlocustotherightSystemwithhigherbandwidthhasbetterabilitytotracktheinputsignal,andhasbetterperformanceonreducinghigh-frequencynoise.（）

答案:错TheNyquistcurveofa1storderphase-leadnetworkis（）

答案:TheupperhalfcircleConsideraminimumphasesystem.Thehigheritsopen-loopgainis（）.

答案:thesmalleritssteady-stateerroris

答案:10degreesTheNyquiststabilitycriterionisusedtodeterminewhetherthereare（）ontherighthalfofthes-plane.

答案:zerosofthecharacteristicpolynomialoftheclosedlooptransferfunctionPolarplotismoreconvenientwhendescribingthefrequencyresponseofasystemthanBodediagramandallowustohaveaninsightintothecomponentscomposedofthissystem.（）

答案:对

答案:Equalsto100###Greaterthan10Oneadvantageofthefrequencyresponsemethodisthereadyavailabilityofsinusoidtestsignalsforvariousrangesoffrequenciesandamplitudes.（）

答案:对

答案:

答案:Foranegativefeedbackcontrolsystemwiththegainbeingnegative,thesegmentsoftherootlocuslocatetotheleftoftheoddopen-looppolesandzeros.（）

答案:错Whentherootlocusofa2ndordersystemisgiven,wecanget（）fromit.

答案:Settingtime###Percentovershoot###StabilityAbouttherootlocusofanegativefeedbackcontrolsystem,whichofthefollowingis对?（）

答案:Therootlociaresymmetricalwithrespecttotherealaxis.

答案:Rootlocusprovidesussomeinstructionstoadjusttheparameterstomaketheperformanceofthissystemsatisfied.（）

答案:对TheRouth-Hurwitzcriterionrevealsthestabilityincasesof（）.

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

答案:criticallystable

答案:2Whenwedeterminethestabilityofasystemwiththefollowingmethods,whichonesareequivalent?（）

答案:Routh-Hurwitzcriterion###Theclosed-looppolesTheparametersofasystemchangedalittleafteralong-termuse,andtheminimumclosed-looppolemoves0.5totheright,thestabilityofthissystemwill（）.

答案:becomesmallerComplexityisameasureofthestructure,intricateness,orbehaviorofasystemthatcharacterizestherelationshipsandinteractionsbetweenvariouscomponents.（）

答案:对Aboutthefeedbackincontrolsystems,whichisthebestdescription?（）

答案:AllotheroptionsLossofgainreferstoareductionintheamplitudeoftheratiooftheoutputsignaltotheinputsignalthroughasystem,usuallymeasuredindecibels.（）

答案:对

答案:Theregulationoffeedbackcontrolworksatthesametimethatdisturbancesactonasystem.（）

答案:错

答案:atype-onesystem

答案:underdamped

答案:therisetimeandthepeaktimewillreduce.Theoptimumcontrolsystemisasystemwhoseparametersareadjustedsothatthe