简介：Fishesarefamousfortheirabilitytopositionthemselvesaccuratelyeveninturbulentflows.Thisabilityistheresultofthecoordinatedmovementoffinswhichextendfromthebody.Wehaveembarkedonaresearchprogramdesignedtodevelopanagileandhighefficientbiologicallyinspiredroboticfishbasedontheperformanceofhybridmechanicalfins.Toaccomplishthisgoal,amechanicalray-likefinactuatedbyShapeMemoryAlloy(SMA)isdeveloped,whichcanrealizebothoscillatorylocomotionandundulatorylocomotion.Wefirstgiveabriefintroductiononthemechanicalstructureofourfinandthencarryouttheoreticanalysisonforcegeneration.DetailedinformationofthesetheoreticalresultsislaterrevealedbyComputationalFluidDynamic(CFD),andisfinalvalidatedbyexperiments.Thisroboticfinhaspotentialapplicationasapropulsorforfutureunderwatervehiclesinadditiontobeingavaluablescientificinstrument.

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简介：ThispaperpresentsnumericalinvestigationsintoaridgedsurfacewhosedesignisinspiredbythegeometryofaFarrer’sscallop.TheobjectiveoftheperformedresearchistoassessiftheproposedBioinspiredRidgedSurface(BRS)canpotentiallyimprovewearresistanceofsoil-engagingcomponentsusedinagriculturalmachineryandtovalidatenumericalsimulationsperformedusingsoftwarebasedontheDiscreteElementMethod(DEM).ThewearperformanceoftheBRSisexperimentallydeterminedandalsocomparedwithaconventionalflatsurface.Differentsizeofsoilparticlesandrelativevelocitiesbetweentheabrasivesandandthetestingsurfacesareused.ComparativeresultsshowthatthenumericalsimulationsareinagreementwiththeexperimentalresultsandsupportthehypothesisthatabrasivewearisgreatlyreducedbysubstitutingaconventionalflatsurfacewiththeBRS.

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