最新Modeling and simulation of systems using MATLAB and Simulink Chapter 2.教学讲义PPT.ppt

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1、ModelingandsimulationofsystemsusingMATLABandSimulinkChapter2.WhyModelingisrequired?Tofindtheheightofatower,SaytheKutubMinarofDelhiortheLeaningtoweratPisawithoutactuallyclimbingit.Tomeasurethewidthofariverwithoutactuallycrossingit.TogaugethemassoftheEarth,notusinganybalance.Tofindthetemperatureatth

2、esurfaceoratthecentreofthesun.ToestimatetheyieldofwheatinIndiafromthestandingcrop.Toquantifytheamountofbloodinsidealivinghumanbody.TopredictthepopulationofChinafortheyear2050.Todeterminethetimerequiredbyasatellitetocompleteoneorbitaroundtheearth,sayattheheightofabout10,000kmabovetheground.Toassess

3、theimpactof30%reductioninincometaxovertthenationaleconomy.Toascertaintheoptimallyefficientgunwhoseperformancedependsontenparameters,eachofwhichcantake10differentvalueswithoutactuallymanufacturing1010guns.Todeterminethemeantimebetweenfailures(MTBF)oraveragelifespanofanelectricbulb.Toforecastthetota

4、lamountofinsuranceclaims,acompanyhastopaynextyear.Etc.etc.Whatismodeling?Modelingisaprocessofabstractionofarealsystem.Modelportraysaconceptualframeworktodescribeasystemandcanbeviewedasabstraction(essence)ofanactualsystemorphysicalreplicaofasystemorasituation.Itisafactualrepresentationofreality.Ste

5、p–2Constructtheconceptualmodel.Statetheassumptionsoncomponentsandstructureofthesystem.Hypothesisonthevaluesofthemodelinput.Step–3-Constructionofmathematicalmodel.-Developmentofcomputerprogram.Step–4-Verificationandvalidationofthemodel.ModelSystemPurposeLevelofDetailBoundariesPerformanceMeasureDesi

6、gnAlternativesImplementationAssessmentProblemSituationProblemDefinitionDirectExperimentationModelBuildingModelSimulationAnalysisDecisionMakingModelBuildingStep–1ObservetherealsystemanditsinteractionsbetweencomponentsCollectdataonitsbehavior.Consulttotheexpertsfordetailedknowledge.Asmodeldevelopmen

7、tproceeds,newquestionsmayraiseandmodeldeveloperwillreturntothisstep.VerificationVerificationisconcernwith–“IsthemodelImplementedcorrectly?”ValidationItisaprocessinwhichmodelbehavioriscomparedwiththeactualsysteman