简介:国际海事组织(IMO)启动了GMDSS现代化的相关工作。2012年,COMSAR第16次会议确定了GMDSS复审和现代化的任务范围,同年海上安全委员会(MSC)第90次会议正式批准并启动了“GMDSS复审与现代化”项目,项目包括高级复审、详细复审和现代化计划三部分内容;2013年,COMSAR第17次会议开始起草GMDSS高级复审结果的初步草案,在同年召开的IMO/ITU联合专家组第9次会议上,该草案正式形成:2014年,航行、通信和搜救分委会(NCSR)第1次会议审议通过了高级复审结果草案,并讨论通过了详细复审大纲;2016年,NCSR第3次会议审议通过了详细复审结果草案,并针对GMDSS现代化计划草案提出意见。2017年,NCSR第4次会议审议通过了GMDSS现代化计划草案,并计划将草案提交至MSC第98会议核准通过。
简介:Theaddedmasscoefficientandthewaterlevelindexformulasforthesame-phaseandanti-phasevibrationofrectangularliquidtanks'bulkheadswerederivedbasedondrymodetheory.Threefluid-structureinteractionnumericalmethodsincludingFluidFEMandFluidBEMwereusedinthiscase.ThecomparisonofnumericalandtheoreticalresultsbythepresentmethodshowsthatANSYS/FluidS0ismorecredible,theNASTRAN/VirtualMassMethodismoresuitableforengineeringcalculationsandresultsofthesame-phasevibrationbythepresentmethodismoreaccurate.
简介:S-surfacecontrolhasproventobeaneffectivemeansformotioncontrolofunderwaterautonomousvehicles(AUV).Howevertherearestillproblemsmaintainingsteadyprecisionofcourseduetotheconstantneedtoadjustparameters,especiallywheretherearedisturbingcurrents.Thusanintelligentintegralwasintroducedtoimproveprecision.AnexpertS-surfacecontrolwasdevelopedtotunetheparameterson-line,basedontheexpertsystem,itprovidesS-surfacecontrolaccordingtopracticalexperienceandcontrolknowledge.Topreventcontroloutputover-compensation,afuzzyneuralnetworkwasincludedtoadjusttheproductionrulestotheknowledgebase.ExperimentswereconductedonanAUVsimulationplatform,andtheresultsshowthattheexpertS-surfacecontrollerperformsbetterthananS-surfacecontrollerinenvironmentswithcurrents,producinggoodsteadyprecisionofcourseinarobustway.
简介:Arraycalibrationisimportantinengineeringpractice.Inthispaper,fastcalibrationmethodsforaULA'sgainandphaseerrorsbothinfarandnearfieldsareproposed.Inthefarfield,usingasinglesoundsourcewithoutexactorientation,thismethodhorizontallyrotatesthearrayexactlyonce,performseigenvaluedecompositionforthecovariancematrixofreceiveddata,thencomputesthegainandphaseerroraccordingtotheformulas.Inthenearfield,usingthesamesinglesoundsource,itisnecessarytorotatethearrayhorizontallyatmostthreetimes,buildequationsaccordingtogeometricrelations,thensolvethem.Usingtheformulaproposedinthispaper,sphericalwavesaremodifiedintoplanewaves.Theneigenvaluesdecompositionisperformed.Thesetwocalibrationmethodswereshowntobevalidbysimulationandarefast,accurateandeasytouse.Finally,ananalysisoffactorsinfluencingestimationprecisionisgiven.
简介:Thearticleexaminestheworldexperienceofe-learningaswellasdistanceeducationtechnologieswithintheeducationprocessorganizationonhigherandpost-highereducationprograms.Therehavebeenlistedtheresultsofthemostpopulare-leamingplatformsanalysis.Furthermore,therehavebeenlookedthroughthecorelegislativebackgroundofthedevelopmentofthementionedtechnologiesinRussiaandworldwideamongtheuniversities,specializedinseafarerstraining.TherehavebeenalsodrawnupthepointsoftheAdmiralMakarovStateUniversityofMaritimeandInlandShipping(AdmiralMakarovSUMIS)designofthedistanceeducationsystemLMS“FARWATER”incompliancewiththeInternationalConventiononStandardsofTraining,CertificationandWatchkeepingforSeafarers(STCWConvention).Thepracticalapplicationofdistanceeducationsystemtotheadvancedprofessionaltraininghasbeendiscussedinthearticle.
简介:Oceanographicsurvey,orothersimilarapplicationsshouldbetheapplicationsofmultipleAUVs.Inthispaper,theskill&simulationbasedhybridcontrolarchitecture(S2BHCA)asthecontroller'sdesignreferencewasproposed.Itisamulti-robotcooperationorientedintelligentcontrolarchitecturebasedonhybridideas.TheS2BHCAattemptstoincorporatethevirtuesofthereactivecontrollerandofthedeliberativecontrollerbyintroducingtheconceptofthe"skill".Theadditionalonlinetasksimulationabilityforcooperationissupported,too.Asanapplication,amultipleAUVcontrolsystemwasdevelopedwiththree"skills"fortheMCMmissionincludingtwodifferentcooperativetasks.Thesimulationandtheseatrialsshowthatsimpletaskexpression,fastreactionandbettercooperationsupportcanbeachievedbyrealizingtheAUVcontrollerbasedontheS2BHCA.