简介：WeproposeaBPNNbasedadaptiveslidingmodecontrolschemeforspeedtrackingofaDCmotorwithunknownsystemnonlinearities.Theinput-outputlinearizationtechniqueisusedtocancelthenonlinearities,andoutputoftheBPNNisincorporatedintothecontrollerintheproposedscheme.ItisshownthattherotorspeedofaDCmotorcanfollowanyarbitrarilyselectedtrajectoriesundervariableloadtorque.Thentheapplicationoftheapproachistestedviacomesimulations.

简介：Theproblemofrobustifyinglinearquadraticregulators(LQRs)foraclassofuncertainaffinenonlinearsystemsisconsidered.First,theexactlinearizationtechniqueisusedtotransformanuncertainnonlinearsystemintoalinearoneandanoptimalLQRisdesignedforthecorrespondingnominalsystem.Then,basedontheintegralslidingmode,adesignapproachtorobustifyingtheoptimalregulatorisstudied.Asaresult,thesystemexhibitsglobalrobustnesstouncertaintiesandtheidealslidingmodedynamicsisthesameasthatoftheoptimalLQRforthenominalsystem.Aglobalrobustoptimalslidingmodecontrol(GROSMC)isrealized.Finally,anumericalsimulationisdemonstratedtoshowtheeffectivenessandsuperiorityoftheproposedalgorithmcomparedwiththeconventionaloptimalLQR.

简介：Anadaptivefuzzyslidingmodecontrol(AFSMC)approachisproposedforaroboticairship.First,themathematicalmodelofanairshipisderivedintheformofanonlinearcontrolsystem.Second,anAFSMCapproachisproposedtodesigntheattitudecontrolsystemofairship,andtheglobalstabilityoftheclosed-loopsystemisprovedbyusingtheLyapunovstabilitytheorem.Finally,simulationresultsverifytheeffectivenessandrobustnessoftheproposedcontrolapproachinthepresenceofmodeluncertaintiesandexternaldisturbances.

简介：

简介：Forasyntheticapertureradar(SAR)systemmountedonageostationaryEarthorbit(GEO)satellite,thetrackcanbecurvilinear.Thus,abistaticSARsystembasedupongeostationarytransmitterand'receive-only'SARsystemonboardairplanes,namelyGEOspaceborne-airbornebistatic(GEOSA-BiSAR),issignificantlydifferentfromthetraditionalbistaticSAR.ThispapermainlystudiestheresolutioncharacteristicoftheslidingspotlightGEOSA-BiSARsystem.Firstly,thecommonazimuthcoverageandcoherentaccumulatedtimearetheoreticallyanalyzedindetail.Then,basedonthegradientmethod,theaccuratetwodimensionalresolutionofaGEOSA-BiSARsystemisanalyticallycalculated.Finally,thesimulationdatashowthecorrectnessandeffectivenessoftheproposedresolutionanalysismethod.

简介：

简介：Thepath-followingcontroloftheasymmetryunderactuatedunmannedsurfacevehicle(USV)underexternaldisturbancessuchasunknownconstantandirrationaloceancurrentsisdiscussed,andanadaptivesliding-modepath-followingcontrolsystemisproposed,whichcomprisesapath-variableupdatedlaw,amodifiedintegralline-of-sight(ILOS)guidancelawbasedonatime-varyinglookaheaddistanceandadaptivefeedbacklinearizingcontrollerscombinedwithsliding-modetechnique.AmoreaccurateUSVmodelwithouttheassumptionofhavingdiagonalinertiaanddampingmatricesisfirstpresented,aimingatimprovingtheperformanceofthepath-followingcontrol.Next,thecoordinatetransformationisadoptedtodecoupletheswaydynamicfromtherudderangle,andthepath-followingerrorsdynamicswithoutnon-singularproblemarepresentedinthemovingFrenet-Serretframe.Then,basedonthecascadedtheoremandtheadaptivesliding-modemethod,theadaptivecontrollawofpositionerrorsandcourseerroraredesigned,amongwhichthelookaheaddistanceandintegralgainareallcomputedasdifferentfunctionsofcross-trackerrortoestimateandcompensatethesideslipanglecausedbyexternaldisturbancesadaptively.Finally,accordingtotheLyapunovandcascadedtheorem,thecontrolsystemproposedisprovedtobeuniformgloballyasymptoticstability(UGAS)anduniformsemiglobalexponentialstability(USGES)whenthecontrolobjectivesareallachieved.Simulationresultsillustratetheprecisionandhigh-qualityperformanceofthisnewcontroller.