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259 个结果
  • 简介:以青岛远洋船员职业学院航海技术专业和山东中圣国际船舶管理有限公司开展航海技术专业现代学徒制人才培养试点的实践为例,分析航海技术专业实施现代学徒制的意义,从人才培养目标的定位、教学过程的安排、课程体系构建、相关管理制度建设、专业教师及师傅遴选标准制定等方面,对航海高职院校实施现代学徒制人才培养模式进行探讨.

  • 标签: 高职航海院校 现代学徒制 航海技术专业 人才培养
  • 简介:对康奈尔大学制订并颁布的《康奈尔大学2010—2015年战略规划》进行介绍与分析,"规划"分析了康奈尔大学发展面临的内外部环境,从康奈尔大学永久的追求出发,明确了康奈尔大学发展的优先事项和主要目标领域,确定了若干关键的行动重心和达到这些目标应该采取的战略措施,探讨了其对中国大学发展的启示。

  • 标签: 康奈尔大学 《康奈尔大学2010—2015年战略规划》 大学发展
  • 简介:在高职航海类专业学员的学习动机、策略、习惯以及学习体验都发生了较大变化的情况下,文章开展了高职航海类专业的学情调查,对调查结果进行了分析,找寻学情发生变化的原因,并提出了对应的策略。

  • 标签: 高职航海类专业 学情调查 数据分析 教学改革
  • 简介:Severalindustrialapplicationssuchaselectronicdevices,heatexchangers,gasturbineblades,etc.needcoolingprocesses.Theinternalcoolingtechniqueisproperforsomeapplications.Inthepresentwork,computationalsimulationsweremadeusingANSYSCFXtopredicttheimprovementsofinternalheattransferintherectangularribbedchannelusingdifferentcoolants.Severalcoolantssuchasair,steam,air/mistandsteam/mistwereinvestigated.Theshearstresstransportmodel(SST)isselectedbycomparingthestandardk-ωandOmegaReynoldsStress(ωRS)turbulencemodelswithexperimentalresults.Theresultsindicatethattheheattransfercoefficientsareenhancedintheribbedchannelwhileinjectingsmallamountsofmist.Theheattransfercoefficientsofair/mist,steamandsteam/mistincreaseby12.5%,49.5%and107%overthatofair,respectively.Furthermore,incomparisontoair,theair/mistheattransfercoefficientenhancesbyabout1.05to1.14timeswhenthemistmassfractionincreasesfrom2%to8%,respectively.Thesteam/mistheattransfercoefficientincreasesbyabout1.12to1.27timeshigherthanthatofsteamovertheconsideredrangeofmistmassfraction.

  • 标签: heat transfer RIB ROUGHNESS MIST rectangular
  • 简介:文章分析了南通港集装箱运输的优势、弱势、机会和威胁,在此基础上,提出了南通港集装箱运输发展策略。

  • 标签: SWOT 南通港 集装箱运输
  • 简介:近年来,在深海进行油气开发的技术进展日新月异,全世界的海洋工程公司都在用更新的科技手段努力向更深的海域拓展,向深海进军已经成为了整个海洋石油工业的总体趋势.作为连接平台设备和海底的重要设备,深海海洋立管的设计和使用也越来越趋向标准化.该文以某深海立管为例,从操作工况和悬挂工况两个方面探讨了钻井立管的整体分析中遇到的主要问题并进行了相关的校核.该文的具体工作包括计算了立管在钻探模态下的旋转角度和应力分布,确定了操作半径、浮箱数目等要素,并根据API规范进行了校核.根据计算的结果可以看出,所选的立管在恶劣海况下的操作半径相对较小,而确定的浮箱数略多,相关结论对立管的初步设计具有较好的参考意义.

  • 标签: 钻井立管 操作工况 悬挂工况 有限元分析
  • 简介:OnMarch26,2010anunderwaterexplosion(UWE)ledtothesinkingoftheROKSCheonan.TheofficialMultinationalCivilian-MilitaryJointInvestigationGroup(MCMJIG)reportconcludedthatthecauseoftheunderwaterexplosionwasa250kgnetexplosiveweight(NEW)detonationatadepthof69mfromaDPRK'CHT-02D'torpedo.KimandGitterman(2012a)determinedtheNEWandseismicmagnitudeas136kgatadepthofapproximately8mand2.04,respectivelyusingbasichydrodynamicsbasedontheoreticalandexperimentalmethodsaswellasspectralanalysisandseismicmethods.ThepurposeofthisstudywastoclarifythecauseoftheUWEviamoredetailedmethodsusingbubbledynamicsandsimulationofpropellersaswellasforensicseismology.Regardingtheobservedbubblepulseperiodof0.990s,0.976sand1.030swerefoundincaseofa136NEWatadetonationdepthof8musingtheboundaryelementmethod(BEM)and3Dbubbleshapesimulationsderivedfora136kgNEWdetonationatadepthof8mapproximately5mportsidefromthehullcenterline.Hereweshowthroughanalyticalequations,modelsand3Dbubbleshapesimulationsthatthemostprobablecauseofthisunderwaterexplosionwasa136kgNEWdetonationatadepthof8mattributabletoaROKlittoral'landcontrol'mine(LCM).

  • 标签: CEPSTRUM SPECTROGRAM BUBBLE pulse TOROIDAL BUBBLE
  • 简介:某双机双桨客滚船在试航过程中,由于主机滑油系统调压阀故障,造成主机在110%负荷试验时由于滑油供油量不足导致曲轴轴瓦严重烧蚀。现对事故原因给予分析,阐述机损维修过程,对避免此类事故的发生给出建议。

  • 标签: 曲轴轴瓦 烧蚀 事故分析
  • 简介:Stronghydrodynamicinteractionsduringtheside-by-sideoffloadingoperationbetweenfloatingliquefiednaturalgas(FLNG)andliquefiednaturalgascarrier(LNGC)caninducehighrisksofcollision.Theweathervaneeffectofasingle-pointmooringsystemnormallyresultsinthesatisfactoryhydrodynamicperformanceoftheside-by-sideconfigurationinheadseas.Nevertheless,thechangesinwavedirectionsinrealseaconditionscansignificantlyinfluencetherelativemotions.Thisarticlestudiestherelativemotionsoftheside-by-sidesystembyusingthetheoreticalanalysismethodandthenumericalcalculationmethod.Basedonthethree-dimensionalpotentialtheorymodifiedbyartificialdamping-lidmethod,thefrequency-domainhydrodynamiccoefficientscanbeimprovedtocalculatetheretardationfunctionsforthemulti-bodyproblem.Anin-housecodeisthendevelopedtoperformthetime-domainsimulationoftwovessels,throughwhichtherelativemotionsaresubsequentlyobtained.Arangeofobliquewavesarechosenfortheextensivecalculationofrelativemotionsbetweenthetwovessels,whicharefurtheranalyzedintermsofthephaseshiftofmotionresponsesinducedbyspecificresonantwavepatterns.Investigationresultsshowthatwavedirectionshaveasignificantinfluenceontherelativesway,roll,andyawmotions.Underthecircumstancethattheabsolutephaseshiftbetweentherollmotionsoftwovesselsapproaches180°,strongerrelativemotionsareinducedwhenLNGCisontheweatherside.Moreover,thegapwaterresonancesathighfrequenciestendtocausethedangerousopposedoscillationoftwovesselsintheswayandyawmodes,whereasFLNGreducesthegapwaterresonancesandrelativemotionswhenlocatedontheweatherside.

  • 标签: FLOATING liquefied natural gas(FLNG) Multi-body system
  • 简介:Inordertostudycavitationcharacteristicsofa2-Dhydrofoil,themethodthatcombinesnonlinearcavitationmodelandmixed-iterationisusedtopredictandanalyzethecavitationperformanceofhydrofoils.ThecavitationelementsarenonlinearlydisposedbasedontheGreenformulaandperturbationpotentialpanelmethod.Atthesametime,themethodthatcombinescavityshapeforfixedcavitylength(CSCL)iterationandcavityshapeforfixedcavitationnumber(CSCN)iterationisusedtoworkoutthethicknessandlengthofhydrofoilcavitations.Throughanalysisofcalculationresults,itcanbeconcludedthatthejumpofpressureandvelocitypotentiallyexistbetweencavitationendareaandnon-cavitationsareaonsuctionsurfacewhencavitationoccursonhydrofoil.Incertainanglesofattack,thecavitationnumberhasanegativeimpactonthelengthofcavitations.Andunderthesameangleofattackandcavitationnumber,thebiggerthethicknessofthehydrofoil,theshorterthecavitationslength.

  • 标签: 2-D HYDROFOIL CAVITATION performance nonlinear theory
  • 简介:近年来云技术的热潮席卷全球,与传统计算机应用相比,这种新的应用模式更加便捷、高效、安全、经济,具有更好的可扩展性.根据实际工作经验,探究云桌面技术的优势,以期解决传统多媒体航运经贸实验室管理中的常见问题.

  • 标签: 云桌面技术 航运经贸 实验室管理
  • 简介:文章对柴油机的故障表象与诊断技术进行了综合分析,结合理论与实践列出了在柴油机故障诊断中的异常声响发生的部位、异响表象特征和故障基本原因,并以实例阐述了柴油机声响异常辨识在故障诊断中的应用,介绍了该故障诊断技术的发展应用前景。

  • 标签: 船舶柴油机 声响异常辨识 故障诊断 技术应用
  • 简介:文章基于单相逆变电源的数学模型,设计了能保证系统渐进稳定的控制率,同时利用观测器观测控制率中的部分状态变量,在理论分析的基础上进行了实验研究。实验结果验证了控制方法的有效性。

  • 标签: 单相逆变电源 稳定控制 状态观测器