Sample_Exam_for_Process_Control.docx

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1、3.Givenafirstorderprocesswthdeadtime,makethelinearizationwithPadapproximation(2points)4.WithrespecttothestepresponseofafirstordermodelintheequationNf)=MK(I-J”，),(2points)命题人组题人审题人findtheoutputsfortp=3and5命题时间：explainthevalueyouobtained:教务处制5. ExplaintheterminologyAir-to-0penvalve(2points)6. Consider

2、theperformanceofanon-offresidentialheatingsystem,inwhichfeedbackcontrolisusedtomonitorandcontrolthetemperature.Forthefollowingproblem,giveyourintuitiveanswer.重庆大学ProcessControl课程试卷20082009学年第二学期中都一、BasicConcepts(30points)1. Whatdeterminestheorderofadynamicmodel?(2points) Thenumberofconstitutiveequat

3、ionsinthemodel. Thenumberoffundamentalbalancesinthemodel. Thenumberoffirstorderdifferentialequationsinthemodel.2. Aquickwaytoestimatetheoveral1dynamicmodelofaseriesoffirstordersystems(asshowninthefigurebelow),isasafirstordersystemwiththefollowingequations:(2points)1 OVeraIlK=11K1(TrueorFalse) Overal

4、1=l(TrueorFalse)Tm(hr)(T)Furniturewereaddedtotheroom?(2points)Theroomwereinsulated?(2points)7. Derivethestatespacerepresentationofthelead-lagtransferfunction:Ys+2F=s+3(T)thestatespacerepresentationofthesystemis(2points)theblockdiagramis(2points)8. Inaprimary-slavemul1.iloopsystem,whatarethefunctiona

5、litiesoftheslaveloop?(4points)9. MakeallthenecessaryequipmentchangesandadditionstobeabletocontrolthefluidlevelinthedrainingtankintheFigurebelowMarktheequipmentyouaddinthefigure(2points)Statethereasonforyourdeviceadditionandchange(2points)10. Thefrequencyresponseforadisturbanceaffectingafeedbackcontr

6、olloopisplottedinthefigure.DescribesthebehaviorinregionAandB? thebehaviorinregionA(2points) thebehaviorinregionB(2points)二、BasicTheory(30points)1. Findthefirstandsecondorderapproximationofthefollowingtransfer 3Function:=X(0.15+i.5s+1)(35+1)whereYandXaretheoutputandinputofasystem(orprocess)(DFindthed

7、ominantpolesforthefirstandsecondorderapproximation(2points) Findthedeadtimet.ofyourapproximationfunctionwhichisafirstorderwithdeadtimefunction(2points) writedowntheMatlabcodeforyourthefirstandsecondorderapproximation(6points)2. Describeyourconsiderationsforthechoiceofcontrollerunderthecircumstanceof

8、P-I-Dcombination. fortemperaturecontrol(5points) forpressurecontrol(5points)3. Atwo-inputandtwo-outputblendingsystemhasthefollowingprocessgain.l0.01matrixK=11 Explaintheinteractioneffectbetweenthepairingvariables(5points) WhatKshouldbeifthissystemisoftheone-wayinteraction?(5points)三、BasicApplication

9、(40points)1- Discussacascadeprocesscontroldesignpresentedinthetextbook.TheprocessisshownasinthefollowingfigureCoMT言一HotprocessstreamprocessstreamFurnaceFuelgas SketchtheblockdiagramwhiIeprimary-slaveloopisused(5points) Considermorecontroldesignsforfurtherimprovingthesystemperformance(10points)2.Give

10、namixingsysteminwhichabluedyeformakingdenimisinjectedintoastreamofwater.Theinjecteddyeisblendedwiththestaticmixersshowninthefigure,aphotodetectorisusedtomonitorthedyeconcentration.一须麴一JXDyeinjectionhMixers1. SketchtheblockdiagramofthisSISOclosed-loopsystemwithphysicalunits(8points) DerivethetransferfunctionofthesystemwhileyourblockdiagramhastransferfunctionsKm1Ge,Ga,Gp,G.,Gm(7points)Givenafeedforward-feedbackcontrolsystemasfollow,（八）IGm1.Statethereasonwhythefeedforwardcontrollerdoesnotaffectthesystemstability(10points)