简介:Apressurizerisoneofimportantequipmentinapressurizedwaterreactorplant.Itisusedtomaintainthepressureofprimarycoolantwithinallowedrangebecausethesharpchangeofcoolantpressureaffectsthesecurityofreactor,therefor,thestudyofpressurizer'spressurecontrolmethodsisveryimportant.Inthispaper,anadaptivefuzzycontrollerispresentedforpressurecontrolofapressurizerinanuclearpowerplant.Thecontrollercanon-linetunefuzzycontrolrulesandparametersbyself-learningintheactualcontrolprocess,whichpossessesthewayofthinkinglikehumantomakeadecision.Thesimulationresultsforapressurizedwaterreactorplantshowthattheadaptivefuzzycontrollerhasoptimumandintelligentcharacteristics,whichprovethecontrolleriseffective.
简介:Asanoveltypeoffoundationinbeachandshallowsea,thebucketstructureisespeciallysuitableforcomplexconditionssuchassoftclaygroundandtheworsetypesofseaenvironments.Inthispaper,thebearingcapacityofamulti-bucketstructureisstudiedbyexperimentswithasinglebucketandfour-bucketfoundationinasaturatedsandlayer.Basedontheexperimentaldataandnumericalanalysisresults,thebearingcapacitybehaviorandthebucketgroupeffectarecomparedandanalyzed.Furthermore,someinfluentialfactors,suchasthesoiltype,theratiooflengthtodiameterL/D,theratioofthebucketspacingtothebucketdiameterS/D,andthebucketnumberareintroducedandtheireffectsonthemulti-bucketstructuralcapacityareinvestigatedTheverticalstaticcapacityadjustmentfactorisintroducedtoevaluatethebucketgroupeffectsofthemulti-bucketfoundation.
简介:为AUV模拟和控制目的提供一个合适的模型,包括水动力学建模的一个新奇推进器的一个一般非线性的动态模型被导出。基于当模特儿的方法,AUV-XX模拟站台被建立在它的运动特征,稳定性,和可控制性上执行基本测试。在一架水平飞机由位置和速度控制组成的运动控制策略为不同任务任务被设计在水下车辆。当车辆以高速度是动人的时,举和沥青的联合控制被采用补偿垂直隧道推进器的减小。一个改进S表面控制器基于电容器板模型被开发,灵活获得选择由限制错误并且改变错误的率的不同形式成为可能。模拟结果证明和模拟站台的导出的一般数学模型能为运动控制的基本测试提供一张测试床。另外,电容器板模型S表面控制在指导车辆与足够的精确性完成需要的位置和速度显示出好表演。
简介:Thecourse-keepingcontrolofunderactuatedhovercraftwithtwoaftpropellerswasconsidered.Thecontroloftheheadingerrorandcross-trackerrorwasaccomplishedbytheyawtorquemerelyinthiscase.Thehovercraftdynamicmodelisnonlinearandunderactuated.AtfirsttheControllabilityofcourse-keepingcontrolforhovercraftwasproved,thenacourse-keepingcontrollawwasderivedthatkeepshovercraftheadingconstantaswellasminimizesthelateralmovementofhovercraft.Theproposedlawguaranteesheadingerrorandswayerrorallconvergetozeroexponentially.Simulationtestswerecarriedouttoillustratetheeffectivenessoftheproposedcontrollaw.Forfurtherresearch,thedisturbanceinfluencewouldbeconsideredinthedynamicequations.
简介:Inthisstudy,wenumericallyinvestigatedthenonlinearfocusedwavegroupactiononatruncatedsurface-piercingstructure,anddevelopedatwo-dimensionalfullynonlinearnumericaltankusingthehigher-orderboundaryelementmethod.WedeterminedtheamplitudeofthewavecomponentsofthefocusedwavegroupbasedontheJONSWAPwavespectrum.Wediscusstheeffectsofthepresenceofasurface-piercingstructureonthecharacteristicsofthefocusedwavegroupandfindthatthelocationofthestructuredoesnotevidentlychangethefocallocationorfocaltimeofthefocusedwavegroup.Thelargestamplitudesoftherun-upandhorizontalforceonthestructureoccurwhenthefrontsurfaceofthestructureisatthefocallocation.Thecriticaldraughtandbreadthofthestructureoccurwhenthewaverun-upreachesitsmaximumalongthestructure.
简介:S-surfacecontrolhasproventobeaneffectivemeansformotioncontrolofunderwaterautonomousvehicles(AUV).Howevertherearestillproblemsmaintainingsteadyprecisionofcourseduetotheconstantneedtoadjustparameters,especiallywheretherearedisturbingcurrents.Thusanintelligentintegralwasintroducedtoimproveprecision.AnexpertS-surfacecontrolwasdevelopedtotunetheparameterson-line,basedontheexpertsystem,itprovidesS-surfacecontrolaccordingtopracticalexperienceandcontrolknowledge.Topreventcontroloutputover-compensation,afuzzyneuralnetworkwasincludedtoadjusttheproductionrulestotheknowledgebase.ExperimentswereconductedonanAUVsimulationplatform,andtheresultsshowthattheexpertS-surfacecontrollerperformsbetterthananS-surfacecontrollerinenvironmentswithcurrents,producinggoodsteadyprecisionofcourseinarobustway.
简介:Uptonow,sometechnologyofneuralnetworksaredevelopedtosolvethenon-linearityofresearchedobjectsandtoimplementtheadaptivecontrolinmanyengineeringfields,andsomegoodresultswereachieved.Thoughitputssomequestionsovertodesignapplicationstructurewithneuralnetworks,itisreallyunknowableaboutthestudymechanismofthose.But,theimportanceofstudyratioiswidelyrealizedbymanyscientistsnow,andsomemethodsonthemodificationofthatareprovided.
简介:Oceanographicsurvey,orothersimilarapplicationsshouldbetheapplicationsofmultipleAUVs.Inthispaper,theskill&simulationbasedhybridcontrolarchitecture(S2BHCA)asthecontroller'sdesignreferencewasproposed.Itisamulti-robotcooperationorientedintelligentcontrolarchitecturebasedonhybridideas.TheS2BHCAattemptstoincorporatethevirtuesofthereactivecontrollerandofthedeliberativecontrollerbyintroducingtheconceptofthe"skill".Theadditionalonlinetasksimulationabilityforcooperationissupported,too.Asanapplication,amultipleAUVcontrolsystemwasdevelopedwiththree"skills"fortheMCMmissionincludingtwodifferentcooperativetasks.Thesimulationandtheseatrialsshowthatsimpletaskexpression,fastreactionandbettercooperationsupportcanbeachievedbyrealizingtheAUVcontrollerbasedontheS2BHCA.
简介:珍贵矿物质资源广泛地在整个海床被散布。自治在水下当为如此的矿物质资源探查时,当广泛的探索区域使与操作员维持接触困难,车辆(AUV)对遥远地操作的车辆(ROV)更好。AUV取决于电池,因此他们的电源消费应该被减少扩大探索时间。为常规海洋的仪器系统的电源在他们的防水封上被合并。这电源来源的外部断断续续的控制由于强加由的限制是直到探索的结束挑战性的在水下环境。因此,AUV必须有能改进性能并且最大化电池能力的使用的一个电源控制系统。作者与一个三步的算法开发了如此的一个电源控制系统。它自动地检测在水下运作的状态和罐头限制电源,在大约15%的有效地减少的电源消费。
简介:Thispaperintroducesthecomposition,controlmethodandtestingresultsoftheintegratedcontrolsystemforthefirsttidalflowelectricitygenerating(TFEG)shipofChina.Thecontrolmethod,controlalgorithmandthespecificcircuitsforthehydrauliessystemarealsointroduced.Ourresearchworksareemphasizedonthecontrolalgorithmofstabilizingfrequencyandsomespecialproblemsofthecontroller.TherelatedprotectionmeasuresforhydraulicsystemandTFEGsystemhavebeentak-
简介:在这份报纸,我们在旋涡流的控制上做了数字研究并且由依附薄splitter盘子拖柱体的减小。有依附的splitter盘子的方形的剖面图的柱体的wake结构为雷纳兹数字的一个范围被分析,基于事件溪流和柱体的高度,在laminar范围。管理流动的海军司烧方程被控制体积方法在蹒跚的格子安排上解决。我们为连接压力的方程使用了半含蓄的方法(简单)为计算的算法。我们的结果证明柱体在上游的一个splitter盘子的存在减少drag,但是它在当板长度在1.5次以后是柱体的高度时,流频率的旋涡上有小影响。一个下游的splitter盘子的存在阻抑流频率的旋涡。进内部方面的液体的乘火车分开砍层被下游的splitter板妨碍。我们的结果建议由依附柱体在上游、下游的同轴的splitter盘子,流的旋涡能被压制,以及减小在拖被获得。我们做了参量的研究决定这些splitter盘子的最佳的长度以便完成低拖并且低旋涡流频率。