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1、Proceedingsofthe9thEuropeanSimulationSymposium,ESS'97,Oct19-23,1997,Passau,GermanyANINTRODUCTIONTOTHEPHYSICALMODELINGLANGUAGEMODELICAHildingElmqvistSvenErikMattssonDynasimABDepartmentofAutomaticControlResearchParkIdeonLundInstituteofTechnologySE-22370Lund,SwedenBox118,SE-22100Lund,S
2、wedenE-mail:Elmqvist@Dynasim.seE-mail:SvenErik@control.LTH.seABSTRACTtions,allsimulationpackagesareonlystronginoneTMdomainandarenotcapableofmodelingcomponentsinAnewlanguagecalledModelicaforphysicalmodel-otherdomainsreasonably.Thisisamajordisadvantageingisdevelopedinaninternationalef
3、fort.Themainsincetechnicalsystemsarebecomingmoreandmoreobjectiveistomakeiteasytoexchangemodelsandheterogeneouswithcomponentsfrommanyengineeringmodellibraries.Thedesignapproachbuildsonnon-domains.causalmodelingwithtrueordinarydifferentialandal-gebraicequationsandtheuseofobject-orient
4、edcon-State-of-theartstructstofacilitatereuseofmodelingknowledge.ThereTechniquesforgeneral-purposephysicalmodelinghavearealreadyseveralmodelinglanguagebasedonthesebeendevelopedduringthelastdecades,butdidnotre-ideasavailablefromuniversitiesandsmallcompanies.ceivemuchattentionfromthes
5、imulationmarket.TheThereisalsosignificantexperienceofusingtheminmodernapproachesbuildonnon-causalmodelingwithvariousapplications.TheaimoftheModelicaeffortistrueequationsandtheuseofobject-orientedconstructstounifytheconceptsandtodesignanewuniformlan-tofacilitatereuseofmodelingknowledg
6、e.Thereareguageformodelrepresentation.Thepaperdescribesthealreadyseveralmodelinglanguageswithsuchasup-effortandgivesanoverviewofModelica.portavailablefromuniversitiesandsmallcompanies.ExamplesofsuchmodelinglanguagesareASCENDINTRODUCTIONJPielaetal.H1991IK,DymolaJElmqvistetal.H1996IK,
7、gPROMSJBartonandPantelidesH1994IK,NMFJSahlinMathematicalmodelingandsimulationareemergingasetal.H1996IK,ObjectMathJFritzsonetal.H1995IK,keytechnologiesinengineering.RelevantcomputerizedOmolaJMattssonetal.H1993IK,SIDOPSJBreunesetools,suitableforintegrationwithtraditionaldesignandBroe
8、ninkH1997I,SmileJKl
