简介：Thispaperaddressesthemulti-faultdiagnosisproblemofthrustersandsensorsforautonomousunderwatervehicles（AUVs）.Traditionalsupportvectordomaindescription（SVDD）haslowclassificationaccuracyintheprocessofAUVmulti-faultpatternclassificationbecauseoftheeffectofsamplesparsedensityandtheunevendistributionofsamples,andsoon.Thus,afuzzyweightedsupportvectordomaindescription（FWSVDD）methodbasedonpositiveandnegativeclasssamplesisproposed.Inthismethod,thenegativeclasssampleisintroducedduringclassifiertraining,andthelocaldensityandtheclassweightareintroducedforeachsample.Toimprovethemulti-faultpatternclassifiertrainingspeedandfaultdiagnosisaccuracyofFWSVDD,amulti-faultmodeclassificationmethodbasedonahierarchicalstrategyisproposed.Thismethodaddsfaultcontaindetectionsurfaceforeachthrusterandsensortoisolatefaultcomponentsduringfaultdiagnosis.Byconsideringtheproblemofpatternclassificationforafuzzysample,whichmaybelocatedintheoverlappingareaofhyper-spheresormaynotbelongtoanyhyper-sphereintheprocessofmulti-faultclassificationbasedonFWSVDD,arelativedistancejudgmentmethodisgiven.Theeffectivenessoftheproposedmulti-faultdiagnosisapproachisdemonstratedthroughwatertankexperimentswithanexperimentalAUVprototype.

简介：ThePearlRiverEstuary（PRE）islocatedattheonshore-offshoretransitionzonebetweenSouthChinaandSouthChinaSeaBasin,anditisofgreatsignificantvalueindiscussingtectonicrelationshipsbetweenSouthChinablockandSouthChinaSeablockandseismicactivitiesalongtheoffshoreactivefaultsinPRE.However,theresearchesongeometriccharacteristicsofoffshorefaultsinthisareaareextremelylacking.ToinvestigatetheoffshorefaultdistributionandtheirgeometricfeaturesinthePREingreaterdetail,weacquiredthirteenseismicreflectionprofilesin2015.Combiningtheanalysisoftheseismicreflectionandfree-airgravityanomalydata,thispaperrevealedthelocation,continuity,andgeometryofthelittoralfaultzoneandotheroffshorefaultsinPRE.ThelittoralfaultzoneiscomposedofthemajorDanganIslandsfaultandseveralparallel,high-angle,normalfaults,whichmainlytrendnortheasttonortheast-to-eastanddiptothesoutheastwithlargedisplacements.Thefaultzoneisdividedintothreedifferentsegmentsbythenorthwest-trendingfaults.Moreover,thebasementdeptharoundDanganIslandsisveryshallow,whileitsuddenlyincreasesalongtheislandswestwardandsouthward.Thesehasresultedintheislandsandneighboringareasbecomingtheplaceswherethestressaccumulateseasily.Theseismogenicpatternofthisareaiscloselyrelatedtothecomprehensiveeffectofintersectingfaultstogetherwiththelowvelocitylayer.