1气体Schematizing the system .pdf

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1、DefiningmodelscopePage1of17DefiningmodelscopeThefirststepinbuildingamodelisdefiningtheproblem.Thisincludesdeterminingwhatthemodelwillbeusedforandhowmuchoftheactualpipingsystemneedstobemodeled.Thepurposeofthisstepistodeterminethespecificgoalsandscopeofthemodel.Questionstobeaskedduringthis

2、stageare:Whatpartofthepipelineneedstobemodeled?Howmuchdetailneedstobeincluded?Whattypeofstudieswillbeperformedwiththemodel?Themoreclearlythesequestionsareanswered,theeasieritistobuildthemodel.Onecommonmistakeistomakethemodeltoodetailedonthefirsttry.Usually,therearesomeerrorsinanewmode

3、l.Themoredetailedthemodelis,themoredifficultitistofinderrors.Instead,startoffwithasimplemodel,getitworking,thenaddondetailsasneeded.SampleprobleminformationThistutorialusesaseriesofexamplestoillustratehowtomodelasystem,onestepatatime.Theseexamplesgiveyouapracticalintroductiontoalloftheba

4、sicelementsofmodelbuilding.Alloftheseexamplesarerelatedtothesamplepipelinedescribedinthefollowingproblemstatement.Eachexamplebuildsontheinformationpresentedinpreviousexamplesandthediscussionimmediatelyprecedingit.Forthisreason,itisrecommendedthatyoureadthroughthediscussionsandexamplesint

5、heordertheyarepresented.Example:ProblemstatementYouareanengineerworkingforACMENaturalGasCorporation,andyouhavebeendirectedtouseSPStomodelpartofthecompany’spipelinesystem.Yoursupervisortellsyouthattheyplantousethemodelinthenearfuturetoperformseveralstudiesincludingasurvivalstudy,acapacity

6、study,andastudyinvolvingtheinstallationofapowerplant.Thesestudiesfocusonthesectionofthepipelinethatconsistsofahighpressuretransmissionlineandamediumpressurelateralbetweenmilepost218andthepipeline’senddeliverypoint.Aftercheckingwithoneoftheotherengineersinthedepartment,youobtainacopyofthe

7、pipingdiagramsforthissectionofthetransmissionsystem.file://C:DocumentsandSettingsuserLocalSettingsTemp~hh5DD8.htm2008-5-6DefiningmodelscopePage2of17DiagramoftheTransmissionSystemDeterminingthephysicalboundariesWhenmodelingapipelinesystem,itisoftennotnecessarytomodele