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简介：ThispaperpresentsafurtherimprovedProductionActivityControlArchitecturetodealwiththecomplexityofinformationbycreatingSub-ProducersandSub-MoverswhichwillnotonlygiveabettercontrolatworkstationlevelbutalsoreduceloadontheDispatcher.ItalsomakesananalysisofthebasicandimprovedPAC(ProductionActivityControl)ArchitectureintheControlSystemforIntegratedManufacturing.ThePACArchitectureandtheimprovementwillfurtherenhancetheflexibilityandadaptabilityofthearchitectureintheeverchangingenvironmentoftheShopFloorControl(SFC)Systems.

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简介：Inordertomeettheneedsofpracticaldesign,aninterpolationtechniqueisemployedtoconstraintheshapeofsurfaces.Themethodofpreservingpositivityontheinterpolationsurfaceandconstraintoninterpolatingdataisalsodeveloped.Theadvantageofthisnewmethodisthatitcanbeusedtoconstraintheshapeofaninterpolatingsurfaceonlybyselectingsuitableparameters,andnumericalexamplesarepresentedtoshowtheperformanceofthemethod.

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简介：Inordertoachieveawheelchairliftfunction,thispaperdesignsatri-scissorsmechanism.Throughtheso-calledH-typetransmissionandL-typeswingrod,thethreescissorsmechanismsliftinthesameratewithonlyonelinermotorwhileensuringthestabilityofthelift.FiniteelementanalysisinANSYSisperformedtoverifythematerialstrength.ThecontrolsystemwithSunplusSCMachievesthevoicecontrolofwheelchairwalkingandlifting.

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简介：ControlsystemdesignpackageslikeMATLAB,MATRIXX,ControlC,SIMNON,etc.havebecomeessentialingredientsofbothundergraduateandgraduatecoursesinthefieldsofsystemsandcontrols.TheuseofMATLABanditscompaniontoolboxesinteachinggraduateandundergraduatecourseswasreportedbymanyeducatorsinthepast.TheexperiencewiththeuseofSIMULINKandMATLABinIntelligentControlCourseisintroducedwhichisofferedtograduatestudentsatBeijingUniversityofAeronauticsandAstronautics(BUAA).TheuseofSIMULINKforsimulationofintelligentcontroloftheirbehaviorisemphasized.TheMATLABfeaturesusefulinthiscoursearepresented.HowSIMULINKandMATLABhelpinenhancingthestudents’understandingofthematerialandreducingtheamountoftimespentinperformingcomputationalhomeworkassignmentsisdiscussed.

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简介：Theobjectiveofthispaperistodevelopaneuralnetwork-basedresidualgeneratortodetectthefaultintheactuatorsforaspecificcommunicationsatelliteinitsattitudecontrolsystem(ACS).First,adynamicmultilayerperceptronnetworkwithdynamicneuronsisused,theseneuronscorrespondtoasecondorderlinearInfiniteImpulseResponse(IIR)filterandanonlinearactivationfunctionwithadjustableparameters.Second,theparametersfromthenetworkareadjustedtominimizeaperformanceindexspecifiedbytheoutputestimatederror,withthegiveninput-outputdatacollectedfromthespecificACS.Then,theproposeddynamicneuralnetworkistrainedandappliedfordetectingthefaultsinjectedtothewheel,whichisthemainactuatorinthenormalmodeforthecommunicationsatellite.Thentheperformanceandcapabilitiesoftheproposednetworkweretestedandcomparedwithaconventionalmodel-basedobserverresidual,showingthedifferencesbetweenthesetwomethods,andindicatingthebenefitoftheproposedalgorithmtoknowtherealstatusofthemomentumwheel.Finally,theapplicationofthemethodsinasatellitegroundstationisdiscussed.

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简介：Hourglassisremarkablyarousedinringrollingsimulationwithreducedintegrationelementbecauseofviolentringvibrationandsmallcontactareaofringwithformingrollers.Hourglassenergycanbereducedbyimprovingmeshdensity.Combinedapproachofartificialdampingandartificialstiffnesscancontrolthehourglass.Aringwithrectangularsectionissimulatedwiththeweightfactorofartificialstiffnessresistancesetto0.2.Theartificialdampinghourglasscontrolcoefficientissetto0.1,andtheartificialstiffnesshourglasscontrolcoefficientissetto0.001.Theratioofhourglassenergytointernalenergyisreducedto2.5percent.Comparedwithaxialspreadwidthtest,theeffectivenessofhourglasscontrolinringrollingsimulationisverified.

简介：BymeansofdirectanalysisoftheconnectionbetweenLoopsubdivisionsurfaceanditscontrolmeshandthecomputationofthebasisfunctions,weobtainaboundonthedistancebetweenLoopsubdivisionsurfacepatchanditscontrolmesh.Theboundcanbeusedtocomputethenumbersofsubdivisionforagiventolerance.Finally,twoexamplesarelistedinthispapertodemonstratetheapplicationsofthebound.