简介:Theaddedmasscoefficientandthewaterlevelindexformulasforthesame-phaseandanti-phasevibrationofrectangularliquidtanks'bulkheadswerederivedbasedondrymodetheory.Threefluid-structureinteractionnumericalmethodsincludingFluidFEMandFluidBEMwereusedinthiscase.ThecomparisonofnumericalandtheoreticalresultsbythepresentmethodshowsthatANSYS/FluidS0ismorecredible,theNASTRAN/VirtualMassMethodismoresuitableforengineeringcalculationsandresultsofthesame-phasevibrationbythepresentmethodismoreaccurate.
简介:《关于修改〈外商独资船务公司审批管理办法〉的决定》自2019年1月1日起施行。交通运输部、商务部决定对《外商独资船务公司审批管理办法》(交通运输部、商务部令2015年第16号)作如下修改:一、将规章名称修改为“《外商独资船务公司设立管理办法》”。二、将第三条修改为“商务部和交通运输部负责外国航商在华独资船务公司的设立管理”。三、将第七条修改为“申请设立独资船务公司,按以下程序办理:(一)申请者依据《中华人民共和国外资企业法》等法律、行政法规和规章的规定在具有相应管理职权的商务主管部门办理相关手续;(二)申请者应当依照公司登记的有关规定,向工商行政管理部门办理企业设立登记,领取营业执照,并在具有相应管理职权的交通运输主管部门办理《外商独资船务公司经营许可证》后,方可从事经营性业务。”四、删除第十条。条文序号作相应调整。《外商独资船务公司审批管理办法》根据本决定作相应修正,重新发布。
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:针对钻井平台波浪补偿控制系统,运用意大利ATOS公司的高性能三位四通电液比例换向阀和天车主动油缸来构造钻柱升沉补偿装置的传递函数,提出一种参数自适应模糊PID集成控制策略.MATLAB/Simulink仿真结果表明,该控制系统性能稳定,可以补偿平台94.3%的升沉运动,补偿精度较高,为搭建3000m深海钻井平台波浪补偿装置可行性提供了可靠的理论依据.
简介:Oceanographicsurvey,orothersimilarapplicationsshouldbetheapplicationsofmultipleAUVs.Inthispaper,theskill&simulationbasedhybridcontrolarchitecture(S2BHCA)asthecontroller'sdesignreferencewasproposed.Itisamulti-robotcooperationorientedintelligentcontrolarchitecturebasedonhybridideas.TheS2BHCAattemptstoincorporatethevirtuesofthereactivecontrollerandofthedeliberativecontrollerbyintroducingtheconceptofthe"skill".Theadditionalonlinetasksimulationabilityforcooperationissupported,too.Asanapplication,amultipleAUVcontrolsystemwasdevelopedwiththree"skills"fortheMCMmissionincludingtwodifferentcooperativetasks.Thesimulationandtheseatrialsshowthatsimpletaskexpression,fastreactionandbettercooperationsupportcanbeachievedbyrealizingtheAUVcontrollerbasedontheS2BHCA.
简介:交通运输部近日印发了《船舶大气污染物排放控制区实施方案》,旨在通过设立船舶大气污染物排放控制区(以下简称排放控制区),降低船舶硫氧化物、氮氧化物、颗粒物和挥发性有机物等大气污染物的排放,持续改善沿海和内河港口城市空气质量。该《方案》的发布,意味着2019年1月1日起,中国沿海将全面限硫。该《方案》在已设立的船舶排放控制区——珠三角、长三角、环渤海(京津冀)三个排放控制水域基础上,进一步扩大控制地理范围,加严控制排放要求,就降低船舶硫氧化物、氮氧化物、颗粒物、挥发性有机物的排放以及船舶排放控制区范围做出了相应的规定。
简介:Inthispaper,a3Dsourcedistributiontechniqueisusedtocalculatethecoupledmotionsbetweentwoshipswhichadvanceinthewavewiththesamespeed.Thenumericalresultsofcoupledmotionsforafrigateandasupplyshiphaveagoodagreementwiththeexperimentalresults.Basedonthe3Dcoupledmotionsoftwoships,aspectralanalysisisemployedtoclearlyobservetheeffectofspeed,clearanceandwaveheadingonthesignificantrelativemotionamplitude(SRMA)oftwoships.Themethodpresentedinthispaperwillbehelpfultoselectsuitableclearance,speedandwaveheadingforunderwayreplenishmentatsea(RAS).