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  • 简介:Inthispaperwedevelopanelasto-dynamicmodelofthehumanarmthatincludeseffectsofneuro-muscularcontroluponelasticdeformationinthelimb.Theelasto-dynamicmodelofthearmisbasedonhybridparametermultiplebodysystemvariationalprojectionprinciplespresentedinthecompanionpaper.Thoughthetechniqueissuitablefordetailedboneandjointmodeling,wepresentsimulationsforsimplifiedgeometryofthebones,discretizedasRayleighbeamswithelongation,whileallowingforlargedeflections.MotionoftheupperextremityissimulatedbyincorporatingmuscleforcesderivedfromaHill-typemodelofmusculotendondynamics.Theeffectsofmuscleforcearemodeledintwoways.Inoneapproach,aneffectivejointtorqueiscalculatedbymultiplyingthemuscleforcebyajointmomentann.Asecondapproachmodelsthemuscleasactingalongastraightlinebetweentheoriginandinsertionsitesofthetendon.Simplearmmotionissimulatedbyutilizingneuralfeedbackandfeedforwardcontrol.Simulationsillustratethecombinedeffectsofneuralcontrolstrategies,modelsofmuscleforceinclusion,andelasticassumptionsonjointtrajectoriesandstressandstraindevelopmentintheboneandtendon.

  • 标签: elasto-dynamics hybrid PARAMETER system musculo SKELETAL
  • 简介:Overthelastdecade,computationalmethodshavebeenintensivelyappliedtoavarietyofscientificresearchesandengi-neeringdesigns.Althoughthecomputationalfluiddynamics(CFD)methodhasplayedadominantroleinstudyingandsimu-latingtransportphenomenainvolvingfluidflowandheatandmasstransfers,inrecentyears,othernumericalmethodsforthesimulationsatmeso-andmicro-scaleshavealsobeenactivelyappliedtosolvethephysicsofcomplexflowandfluid-interfaceinteractions.Thispaperpresentsareviewofrecentadvancesinmulti-scalecomputationalsimulationofbiomimeticsrelatedfluidflowproblems.Thestate-of-the-artnumericaltechniques,suchaslatticeBoltzmannmethod(LBM),moleculardynamics(MD),andconventionalCFD,appliedtodifferentproblemssuchasfishflow,electro-osmosiseffectofearthwormmotion,andself-cleaninghydrophobicsurface,andthenumericalapproachesareintroduced.Thenewchallengingofmodellingbiomi-meticsproblemsindevelopingthephysicalconditionsofself-cleanhydrophobicsurfacesisdiscussed.

  • 标签: 仿生学 计算机模拟 宏指令 力学