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  • 简介:Lowweightandcompactnessarethemainrequirementsoncomponentsforexoskeletons.Fordrivesthismeansalsohighefficiencytokeepenergystorageandpowertransducingdevicessmall.Thedigitalhydrauliccylinderdriveisanexcellentcandidatetobecomeasuperiortechnologyforexoskeletonactuation.Itrequiresseveralvalvestocontrolpressureinitsmanychambers.Solenoidvalvessufferfromthehighweightandspaceofthesolenoids.Inthispaper,thehydraulicbinarycounterinaconfigurationwithonlypassiveelementsisstudiedmathematically,sinceitcancontroladigitalcylinderwithmuchsmallerspaceandweightthanmagneticallyactuatedvalves.Fromqualitativeconsiderationsofthesystemequationssupplementedbyanumericalstudy,itisshownthatsuchacounterworksproperly.Butitposesrequirementsonthecontrolpressurerangewhicharedifficulttofulfilfordigitalcylinderdriveswithmorethanfivechambers.

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  • 简介:Remainingusefullife(RUL)estimationisatopicthathasgainedmoreandmoreattentioninthefieldoffluidpowersystems,thankstothetremendouspotentialsshownforimprovingsafetyandreducedproductionlosses.However,manychallengesrelatedtoRULestimationarenotsolvedyet,mainlyconnectedtothedefinitionofthehealthstatusofeachcomponent.Aprognosticmethodbasedonadata-drivenmethodologyforhydraulicsystemsishereproposedtoestimatethepercentageoflifealreadyspentbythemonitoredcomponents.Thepotentialsofthemethodologyareshownconsideringthecaseofatruck-mountedhydrauliccrane,forwhichasimulationmodelwasavailable.

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