PDF Parameter Estimation参数估计

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1、CharacterizationofViscoelasticSoftTissuePropertiesfromInvivoAnimalExperimentsandInverseFEParameterEstimation12JungKimandMandayamA.Srinivasan1Dept.ofMechanicalEngineering,KoreaAdvancedInstituteofScienceandTechnology,Korea2TheTouchLab,DeptofMechanicalEngineering,

2、MassachusettsInstituteofTechnology,USAjungkim@kaist.ac.kr,srini@mit.eduAbstract.Softtissuecharacterizationandmodelingbasedonlivingtissueshasbeeninvestigatedinordertoprovideamorerealisticbehaviorinavirtualreal-itybasedsurgicalsimulation.Inthispaper,wecharacteriz

3、ethenonlinearvis-coelasticpropertiesofintra-abdominalorgansusingthedatafrominvivoani-malexperimentsandinverseFEparameterestimationalgorithm.Intheassump-tionsofquasi-linear-viscoelastictheory,weestimatedtheviscoelasticandhy-perelasticmaterialparameterstoprovidea

4、physicallybasedsimulationoftissuedeformations.Tocalibratetheparameterstotheexperimentalresults,wedevel-opedathreedimensionalFEmodeltosimulatetheforcesattheindenterandanoptimizationprogramthatupdatesnewparametersandrunsthesimulationit-eratively.Wecansuccessfully

5、reducethetimeandcomputationresourcesbydecouplingtheviscoelasticpartandnonlinearelasticpartinatissuemodel.Thecomparisonbetweensimulationandexperimentalbehaviorofpigintraabdomi-nalsofttissuearepresentedtoprovideavalidnessofthetissuemodelusingourapproach.1Introduc

6、tionSofttissuecharacterizationandmodelinghasbeeninvestigatedinordertounderstandmechanismsoftraumaticinjury.Forexample,Farshadetal.[1]characterizedthematerialparametersofpigkidneybasedonuniaxialtensiontestsonexvivosamples.Theyweremainlyinterestedinatissuebehavio

7、runderhighspeedorimpactloadingconditions,whichoccurinaccidents,sotheirmeasurementsweremainlyexvivomeasurements.Recentdevelopmentsinmedicalinstrumentshavemotivatedthetissuecharacterizationunderthelowerspeedloadingconditionsandusingthedatafrominvivomeasurementswh

8、ichareexpectedtoprovidethepropertiesoflivingtissues.Daviesetal.[2]developedatwodimensionalmathematicalmodelforpigspleentissuefromuniformcompressiontestsusingalarge-areainden