简介:Inthispaper,westudythecontrollabilityresultsforthenonlinearimpulsiveintegrodifferentialevolutionsystemswithtime-varyingdelaysinBanachspaces.Thesufficientconditionsofexactcontrollabilityisprovedunderwithoutassumingthecompactnessoftheevolutionoperator.TheresultsareobtainedbyusingthesemigrouptheoryandtheSchaferfixedpointtheorem.
简介:Inthispaper,theglobalasymptoticstabilizationbyoutputfeedbackisinvestigatedforaclassofuncertainnonlinearsystemswithunmeasuredstatesdependentgrowth.Comparedwiththecloselyrelatedworks,theremarkablenessofthepaperisthateitherthegrowthrateisanunknownconstantorthedimensionoftheclosed-loopsystemissignificantlyreduced,mainlyduetotheintroductionofadistinctdynamichigh-gainobserverbasedonanewupdatinglaw.Motivatedbytherelatedstabilizationresults,andbyskillfullyusingthemethodsofuniversalcontrolandbackstepping,weobtainthedesignschemetoanadaptiveoutput-feedbackstabilizingcontrollertoguaranteetheglobalasymptoticstabilityoftheresultingclosed-loopsystem.Additionally,anumericalexampleisconsideredtodemonstratetheeffectivenessoftheproposedmethod.
简介:Thedevelopmentofnewproductsofhighquality,lowunitcost,andshortleadtimetomarketarethekeyelementsrequiredforanyenterprisetoobtainacompetitiveadvantage.Thispartofthepaperpresentsamethodologytoautomaticallysimulatetheconceptualdesignresultsinthevirtualentityform.Totheidentifiedbasicmechanisms,theirkinematicanalysisiscarriedoutbymatchingbasicBarranovtrusses,andtheirvirtualentitiesaremodeledbasedonfeature-basedtechniqueandencapsulatedasonedesignobject.Basedonthestructuresofthebasicmechanismsandtheirconnections,aspacelayouttothemechanicalsystemcorrespondingtothesymbolicschemeisthenfulfilled.Withthepreset-assemblyapproach,allpartsinthemechanicalsystemareputontoproperpositionswheretheconstraintequationsaremetaccordingtothespacelayoutresults.Inthisway,thevirtualentityassemblymodelofthemechanicalsystemrelativetothesymbolicschemeissetup.Theapproachpresentedinthispapercannotonlyobtaininnovativeconceptualconceptualdesignresults,butalsocanevaluatetheirperformancesunder3-Denviromentefficently.
简介:Thedevelopmentofnewproductsofhighquality,lowunitcost,andshortleadtimetomarketarethekeyelementsrequiredforanyenterprisetoobtainacompetitiveadvantage.Forshortingtheleadtimetomarketandimprovingthecreativityandperformancesoftheproduct,arule-basedconceptualdesignapproachandamethodologytosimulatetheconceptualdesignresultsgeneratedinconceptualdesignprocessinautomaticalvirtualentityformarepresentedinthispaper.Thispartofpaperpresentsarule-basedconceptualdesignmethodforgeneratingcreativeconceptualdesignschemesofmechanismsbasedonYan’skinematicchainregenerationcreativedesignmethod.Thedesignrulesareadoptedtodescribethedesignrequirementsofthefunctionalcharacteristics,theconnectionrelationshipsandtopologicalcharacteristicsamongmechanisms.Throughthegraphs-basedreasoningprocess,theconceptualdesignspaceisexpandedextremely,andthepotentialcreativeconceptualdesignresultsarethendugout.Byrefiningthedesignrules,thesolutionexplorationproblemisavioded,andthetendentiousconceptualdesignschemesaregenerated.Sincemechanical,electricalandhydraulicsubsystemscanbetransformedintogeneralmechansims,theconceptualdesignmethodpresentedinthispapercanalsobeappliedintheconceptualdesignproblemofcomplexmechatronicsystems.Andthenthemethodtoidentifyconceptualdesignschemesisgiven.