简介:Withtheincreasingimportanceofoceanexploitation,providinganti-rollingstabilityforshipsatanchorhasbecomemoreandmoreimportant.Thelift-generationtheoryoftraditionalfinstabilizersisbasedonincomingflowvelocity,whichisnotsuitableforexplainingliftgeneratedatanchor.Weanalyzednon-steadyflows,withforcesonfinstabilizersgeneratedbynon-incomingflowvelocityconditions,andgaveanewlift-generationmodel.Thecorrectnessofthemodelwasprovenbycomparingexperimentalresultsoffinstabilizermotionundernon-incomingvelocityconditionsfromthefluidcomputationsoftwarewiththatfromtheemulatorofthelift-generationmodel.Finally,themodelwasusedinananti-rollingsystemonashipandthereductionofrollwasmuchbetterthanwhatcouldbeachievedbypassiveanti-rollingtanks.
简介:Tbegoalofthispaperistoresearchonenewcharacteristicofcomplexsystem.Brittleness,whichisonenewcharacteriticofcomplexsystem,ispresentedinthispaper.Thelinguisticandqualitativedescriptionsofcomplexsystemarealsogiveninthispaper.Otherwise,thequalitativedescriptionofcomplexsystemispresentedatfirst.Onthebasisofanalyzingtheexistingbrittlenessproblems,linguisticdescriptionandmathematicdescriptionofbrittlenessaregivenaswell.Threekindsofphenomenatojudgebrittlenessofcomplexsystemarealsogiven,basedoncatastrophetheory.Basiccharacteristicsofbrittlenessaregivenonthebasisofitsmathematicdescription.Twocriticalpointsetsaredefinedbyusingcatastrophetheory.Thedefinitionofbrittlenessanditsrelatedtheorycanservethecontrolofcomplexsystem,andprovidetheoreticalbasisforthedesignandcontrolofcomplexsystem.
简介:以便更精确地在粗野货物产量检验发展中的趋势,我们为货物产量的概率分发建模。等到在港口和处理设备的操作效率乘货物轮船花了,粗野货物产量被决定。粗野货物产量是为到达港口的每艘货物轮船决定货物产量的每个方面的所有复合变量的和。概率分发用Wald方程被决定。结果证明粗野货物产量的可变性首先取决于到达港口的不同货物轮船要求的不同时间。这个模型克服以前的模型的缺点:精确地决定未来的特定的价值的概率的无能粗野货物产量。我们货物产量的建议模型取决于在到达港口和在港口处理设备的运作的能力的一艘货物轮船要求的时间之间的关系。同时,影响粗野货物产量的关键因素被分析。为了测试模型,的效率,在山东省的一个端口的货物卷被用作一个例子。在案例研究,实际结果匹配我们的理论分析。
简介:Inthestrapdowninertialnavigationsystem,theFiberOpticalGyro(FOG)musthavehighprecisiontogiveaccuratenavigationinformation.Inthispaper,adigitalclosedloopdetectionmethodbasedontherampwavemodulatingtechnigueisintroduced.DSPandFPGAhavemanyadvantagesindigitalsignalprocessing.Inthedesign,byusingDSP,acomplexarithmeticoperationiscompletedtomeettheneedsofclosedloopcontrolofFOGwithinashorttime.AllkindsofcontrolsignalsareproducedeasilybyFPGA,underwhichDSPcouldworkproperly.CombiningtheDSPandFPGA,thedetectingmethodisimplementedsuccessfully.Intheend,theresultoftestandperformanceisgiven.FromtheresultwecanconcludethattheprecisionofFOGisimprovedandthenoisesarelimitedtoalowlevel.
简介:一条途径为优化基于支持向量回归(SVR)的beamforming被建议。在学习SVR算法和它的最初的费用函数的数学主管以后,修改费用函数首先被用于一致数组beamforming,然后beamforming的相应参数被优化。SVR一致数组beamforming的框架然后被建立。模拟结果证明SVRbeamforming不能仅仅接近在没有噪音并且与小数据的区域的常规beamforming的表演设定,而且改进归纳能力并且减少计算负担。另外,由SVR算法的线性、圆形的数组的方面脑叶水平与常规的通过比较严厉地被改进。SVRbeamforming比在线性、圆形的数组的常规方法优异,在单身的来源或两倍非协调的来源下面。
简介:以便在轮船提高旅客撤退模拟的真实性和精确性,一个新多格子模型根据一个传统的细胞的自动机模型被建议。在新模型,更好的格子被使用,在行人之中或在行人和构造之间的力量的相互作用被考虑,并且在多水平的静态的地板地退出环境被简化进舱和出口静电干扰地板地。与传统的细胞的自动机模型相比,多格子模型提高了旅客轨道的连续性和边界资格的精确。旅客的脱臼分发以及轨道的部分重叠的功能由于拥挤被认识到。而且,作为一个例子拿典型的舱环境,二个模型被用来在一样的条件下面分析旅客撤退。二个模型模仿的旅客撤退的法律是类似的,这被发现,当模拟真实性和精确性被多格子模型提高时。
简介:Inthispaper,thestabilityofaconcavesphericalstembulkheadunderthepumpingloadwhenstilllyingattheslipwayisanalyzed.Thestabilityofthesphericalstembulkheadwithdifferentshellthicknessandreinforcingformsisdiscussed.Accordingtotheresultsofstabilityanalysis,theoptimizationdesignofthesphericalstembulkheadstabilityisperformed.Onthebasisofconsideringthemachiningtechnicalrequirementsofthebulkhead,arationaldesignofthesphericalstembulkheadstructureisobtained.Thispaperhasacertainvaluetothedesignofsubmarine'ssphericalstembulkhead.
简介:Anewgenerationconicalspraysystemforconventionaldieselenginesorpremixedcombustiondieselenginesisintroduced.Bymeansoforientedimpingementmethod,flexiblespraypenetrationindesignisrealized.High-speedphotographwasusedtoinvestigatethespatialdistributioncharacteristicsofthenewsprayforcasesofdifferentimpingementanglesandneedlevalveopeningpressures.Theresultsshowthat,byapplyingsprayimpingementorientation,fueljetsspreadalongtheconesurfaceasshapeofsectors,sothedispersionofjetsisincreasedobviously.Changingonimpingementangleleadstovariationofpenetration,whichiscriticalinhomogeneousmixturepreparation.Duetotheflexibilityofspraypenetrationindesign,thesprayimpingementonlinerisavoidedinagreatextent.Theresultsalsoindicatethathigherneedlevalveopeningpressureresultsinlongerpenetrationandlargersprayangleafterimpingement.Combustioncharacteristicsoftheimpingedconicalspraywerestudiedinthe1135typedieselengine.ThenewimpingedconicalspraysystemworksmoothlyinfullloadrangewithbetterfueleconomyandloweremissionsofNOxandsootthantheoriginaltestengine.
简介:Inthispaper,thevibrationandsoundradiationoftheunderwatercomplexshell-structurewhichisthecylindricalshellwithhemi-sphericalshellontheendsarestudiedbystatisticalenergyanalysis(SEA).Thewholeshell-structureisdividedintothefoursubsystems,andtheSEAphysicalmodelandpowerflowbalanceequationsamongthesesubsystemsareestablished.Thesimilituderelationsofinputpower,couplinglossfactorandmodaldensityofthesubsystemsbetweenthecomplexshell-structureanditsscaled-downmodelareanalyzed.Accordingtothesimilitudetheoryandpowerflowbalanceequations,whentheimmergedshell-structuresareexcited,thesimilarrelationsofspatiallyaveragedvibrationresponseandunderwaterradiatingsoundpowerareestablishedforthecomplexshell-structureanditsscaled-downmodel.
简介:在舷侧减少颤动能是有益的尖,作者因此设计了一种新类型尖与一个塞子类型蓄电池更潮湿。为尖更潮湿的包括的低影响排水量,低速度,以及适当锁住速度的特殊要求。在内更潮湿,一个塞子类型蓄电池被安装并且在活塞杆的外面上,有暴露的折皱的一个试管被增加。在活塞和柱体之间,一条清理封口被增加。用数学建模,颤动上的dampers影响排水量的动态表演的效果被观察。在活塞和柱体,在蓄电池的春天的僵硬,throttle阀门尺寸,和锁住的速度抵抗之间的清理的变化更潮湿分别地被模仿并且学习。基于模拟的结果,有最佳的参数的dampers与不同蓄电池春天僵硬被开发并且测试并且不同扼杀。模拟和试验性的结果证明参数象在活塞和柱体之间的封口清理那样,累加器触发僵硬并且扼杀参数在dampers影响排水量,低速度抵抗和锁住的速度上有重要效果。
简介:Thestructure,functionandrecognitionmethodofanaxisorbitauto-recognizingsystemarepresentedinthispaper.Inordertomakethebestuseofinformationofformatanddynamiccharacteristicsofmarinesteamturbineaxisorbit,thestructureandfunctionsorneuralnetworkareappliedtothissystem,whichcanbeusedtoauto-recognizeaxisorbitofthesystemturbinerotorusingBPneuralnetwork.
简介:Anewisolatorcomposedofasteelropespringandamagneto-rheological(MR)damperwasdesignedandastudyonlow-frequencymechanicalcharacteristicsofMRdampersinisolatorswascarriedout.ItusedthecharacteristicsoftheMRdamper,suchasfastresponse,controllabledamping,smallenergyconsumption,widedynamicscope,andgreatadaptation.TherelationshipsbetweenMRdampingforcesandinfluencingfactorswereanalyzedbasedonexperimentaldata.Theresultsshowthatdampingforceisnotonlyrelatedtostructuraldimensions,butalsocloselyrelatedtocontrollablecurrentandvibrationfrequency.Finally,theempiricalformulafordampingforceswascorrected,andtherelationshipbetweencorrectioncoefficientsandfactorsanalyzed.