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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
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