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1、Proceedings1ofthe1stWorldCongressonSystemSimulation(WCSS'97),Sept.1-3,1997,SingaporeMODELICA—THENEXTGENERATIONMODELINGLANGUAGEANINTERNATIONALDESIGNEFFORTHildingElmqvistSvenErikMattssonDynasimABDepartmentofAutomaticControlResearchParkIdeonLundInstituteofTechnologySE-22370Lund,SwedenBox118,S
2、E-22100Lund,SwedenE-mail:Elmqvist@Dynasim.seE-mail:SvenErik@control.LTH.seAbstractaregeneral-purposetoolssuchasACSL,SIMULINK,SystemBuild,whicharebasedonthesamemodel-AnewlanguagecalledModelicaforphysicalmodelingingmethodology,input-outputblocks,asinthepre-isdevelopedinaninternationaleffort.
3、Themainviousstandardizationeffort,CSSL,from1967J18K.objectiveistomakeiteasytoexchangemodelsandTherearedomainorientedpackages:electronicpro-modellibraries.Thedesignapproachbuildsonnon-gramsHSPICE,SaberI,multibodysystemsHADAMS,casualmodelingwithtrueordinarydifferentialandDADS,SIMPACKI,chemic
4、alprocessesHASPENPlus,algebraicequationsandtheuseofobject-orientedSpeedUpIetc.Withfewexceptions,allsimulationconstructstofacilitatereuseofmodelingknowledge.packagesareonlystronginonedomainandarenotTherearealreadyseveralmodelinglanguagebasedcapableofmodelingcomponentsinotherdomainsrea-onthe
5、seideasavailablefromuniversitiesandsmallsonably.Thisisamajordisadvantagesincetechnicalcompanies.Thereisalsosignificantexperienceofusingsystemsarebecomingmoreandmoreheterogeneoustheminvariousapplications.TheaimoftheModelicawithcomponentsfrommanyengineeringdomains.effortistounifytheconceptsan
6、ddesignanewuniformlanguageformodelrepresentation.ThepaperdescribestheeffortandgivesanoverviewofModelica.1.2State-of-theartTechniquesforgeneral-purposephysicalmodelinghavebeendevelopedduringthelastdecades,but1.IntroductiondidnotreceivemuchattentionfromthesimulationMathematicalmodelingandsim
7、ulationareemergingmarket.Themodernapproachesbuildonnon-causalaskeytechnologiesinengineering.Relevantcomput-modelingwithtrueequationsandtheuseofobject-erizedtools,suitableforintegrationwithtraditionalorientedconstructstofacilitatereuseofmodelingdesignmethodsare
