最新Modeling mechanical systems using multibonds. - ETH Z教学讲义ppt课件.ppt

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1、Modelingmechanicalsystemsusingmultibonds.-ETHZOverviewMotivationIntroductiontobondgraphsPresentationofmultibondgraphs3D-mechanicalmodelsConclusionsMotivationFirstobjective:Implementationofageneralmodelingtoolformultidimensionalphysicalprocesses:multibondgraphs

2、.Secondobjective:Themodelingofmechanicalsystemsintermsofmultibondgraphs.Bondgraphs:ExampleBondgraphs:ExampleBondgraphs:ExampleAdvantagesofbondgraphsBondgraphsofferageneralmodelingapproachtoawiderangeofphysicalsystems.Theyfindtherightbalancebetweenspecificityand

3、generality.Theconceptofenergyandpowercreatesasemanticlevelforeachbondgraph.Relationscanmorenaturallybeexpressedin2D-drawingsthanin1D-code.TheModelica/DymolaBondLibBondgraphscanbecomposedonscreenbydraganddrop.Theresultingmodelcandirectlybesimulated.Thelibraryfea

4、turesdomainspecificsolutions,e.g.,alibraryforelectricsystems.Bondgraphsformechanics1Unfortunately,theBondLibdoesn’tfeaturemechanicalapplications.Variousotherapproachestothissubjectareinsufficientand/oroutdated.Bondgraphsformechanics2Problemsofmechanicalbondgrap

5、hs:MechanicalprocessesaremultidimensionalUsageofMultiBondGraphs.Holonomicconstraintsarenon-physicalNeedforextramodelingviasignals.MechanicalbondgraphsbecomeverylargeWrappingofthebondgraphicmodels.Multibondsareavectorialextensionofbondgraphs.Amultibondcoversanar

6、bitrarynumberofsinglebondsofthesamedomain.Allvertexelementsareextendedaccordingly.MultiBondGraphs}f3vtfyvyfxvxCompositionofamultibondforplanarmechanicsTheMultiBondLibAModelica/DymolaLibraryformodelingMultibondgraphshasbeendeveloped.ItisanadaptationoftheBondLib

7、.Furtherpossibleapplicationsofmultibondgraphsare:multidimensionalheatdistributionchemicalreactiondynamicsgeneralrelativity.Multibondgraphs:ExampleMultibondgraphofaplanarpendulumMultibondgraphs:SensorsSensorelementsservefordifferentpurposes.Theycanbeusedto......

8、measurebondgraphicvariables....convertbondgraphicvariablestonon-bondgraphicsignals....establishalgebraicrelationshipsbetweenbondgraphicelements.Applicationofabondgraphicsens