简介:Realisticsimulationofunderwatersceneisalwaysdifficultbecauseofthespecialandcomplexvisioneffectsinunderwaterspace.Seabedisanimportantpartofunderwaterenvironment.ThispaperdescribesthemethodsforseabedscenesimulationbasedonOpenGL.Itincludesconstructionoffluctuantterrainbasedontherandomsinusoidalalgorithm,simulationofseabedflickereffectbymeansofcirculartexturemappingandgenerationofturbidityeffectbyusingfogtechniques.Fortheapplicationbasedontheleadinghighlevel3Ddevelopmentenvironment-Vega,underwaterscenesimulationisstilladifficultysincethereisnomoduleforit.BasedontheanalysisofVegasoftwareandtheresearchonseabedscenesimulationmethods,aVegaextendingmodulenamed'UnderwaterSpace'wascreatedthroughdevelopingmoduleclassandextendinglynxinterface.ThemoduleclasswasdesignedthroughdevelopingDLLwritteninC++.TheLynxwasextendedthroughdevelopingkeywordconfigurefile,GUIconfigurefileandlynxplug-inDLL.TheproblemthatVegacan'tsimulateunderwaterspace,iselementarilyresolved.Theresultsshowthatthismoduleisefficient,easyusing,andtheseabedsceneimagesarevivid.
简介:Inthispaper,a3Dsourcedistributiontechniqueisusedtocalculatethecoupledmotionsbetweentwoshipswhichadvanceinthewavewiththesamespeed.Thenumericalresultsofcoupledmotionsforafrigateandasupplyshiphaveagoodagreementwiththeexperimentalresults.Basedonthe3Dcoupledmotionsoftwoships,aspectralanalysisisemployedtoclearlyobservetheeffectofspeed,clearanceandwaveheadingonthesignificantrelativemotionamplitude(SRMA)oftwoships.Themethodpresentedinthispaperwillbehelpfultoselectsuitableclearance,speedandwaveheadingforunderwayreplenishmentatsea(RAS).
简介:Tofindthedifferenceindynamiccharacteristicsbetweenconventionalmonohullshipandwavepenetratingcatamaran(WPC),aWPCwastakenasanobject;itsdynamiccharacteristicswerecomputedbytransfermatrixmethodandfiniteelementmethodrespectively.Accordingtothecomparisonofthenaturefrequencyresultsandmodeshaperesults,thefactthatFEMmethodismoresuitabletodynamiccharacteristicsanalysisofaWPCwaspointedout,specialfeaturesondynamiccharacteristicsofWPCweregiven,andsomebeneficialsuggestionsareproposedtooptimizethestrengthofaWPCindesignperiod.
简介:Commoneffectofwaveandslipofinternalheavyloadwillmakerollingoftheroll-onshipserious.Thisisoneoftheimportantreasonsforoverturnofro-roships.ThemultibodiesSystemwithafloatingbaseiscomposedofro-roshipandslippingheavyload.Thispapertakestherollingangleoftheshipandthetransversedisplacementoftheheavyloadondeskastwofreedoms.Makinguseofanalysisofapparentgravitationandapparentbuoyancy,thewaverollingmomentisderived.Byuseofdynamicmethodofmultibodiessystemwithafloatingbase,dynamicequationsofthesystemareestablished.Takingacertainchannelferryasanexample,asetofnumericalcalculationhavebeencarriedoutforrollingresponseoftheshipanddisplacementresponseoftheslippingheavyloadundercommoneffectofsynchro-slippingheavyloadsandwave.
简介:AmechanicalmodelisestablishedformodeⅡinterfacialcrackstaticgrowingalonganelastic-elasticpowerlawcreepingbimaterialinterface.Forfrictionalcontactofboundaryconditionsoncrackfaces,asymptoticsolutionsofthestressesandstrainsofneartip-crackaregot.Itwasshownthatinstablecreepgrowingphase,elasticdeformationandviscousdeformationareequallydominantinthenear-tipfield,thestressandstrainhavethesamesingularityandthereisnottheoscillatorysingularitythefield.Throughnumericalcalculation,itisshownthatthefrictionalcoefficientηnotablyinfluencethecrack-tipfield.
简介:Anewmethodofestimatingthefrequency-knownsignalsfromthestrongbackgroundnoisewaspresentedfirst.Thenthenewmethodwasusedinthedemodulationofthedigitalfrequencymodulation(FSK)signals.ThenewdemodulationmethodcancompletethedemodulationoftheFSKsignalsonlywiththecarrierfrequencyandwithoutanycarrierphaseinformation.Thesimulationresultsshowthattheperformanceofanti-noiseofthenewmethodisbetterthanthatoftheincoherentdemodulationmethodandthefluctuationofthecarrierphasehaslittleeffectonthenewmethod.Sothenewdemodulationmethodhasafineprospectinthepracticalapplications.
简介:Inthispaper,theeffectofplasticconstraintontheinitiationofductiletearsinfourdifferentshipbuildingstructuralsteelshasbeenexperimentallystudiedbymeasuringtheJ-integralandcrackopeningdisplacementCODatinitiationinthree-pointbendspecimenswithdeepandshallownotches.ExperimentalresultsofsevengroupsofdifferentstrengthalloysteelsshowthatbothδìandJìvaluesofductiletearfromtheshallowcrackspecimenswhichhavelessconstraintflowfieldaresignificantlyhigherthanthoseofdeeplynotchedspecimens.Slip-line-fieldanalysisshowsthat,forshallowcrack,thehydrostaticstressislowerthanthatfromstandarddeeplycrackedbendspecimen,whichdevelopsahighlevelofcracktipconstraint,providesalowerboundestimateoftoughness,andwillensureanundulyconservativeapproachwhenappliedtostructuraldefects,especiallyifinitiationvaluesofCODandJ-integralareused.
简介:中远海运物流有限公司隶属于中国远洋海运集团有限公司,由中国远洋物流有限公司、中海集团物流有限公司和中海船务代理有限公司重组整合而成,于2016年12月21日正式挂牌运营。2017年9月18日,中国外轮理货总公司整合并入中远海运物流有限公司。中远海运物流是居中国市场领先地位的国际化物流企业,在项目物流、工程物流、综合货运、仓储物流、船舶代理、供应链管理、理货检验等业务领域为国内外客户提供全程物流解决方案。
简介:亚洲大部分船东客户以及燃油供应商均在提前准备春节假期,市场交易氛围日益清淡。2019年1月市场回顾今年年初,受国际原油价格上涨带动,新加坡燃料油价格也呈现一路上涨走势。根据PLATTS公布数据,新加坡市场380CST高硫燃料油1月份现货均价为373美元/吨,环比上月的365美元/吨上涨了8个美金,涨幅为2%。从全月走势来看,月初价格大体在323美元/吨,月末价格为385美元/吨,大幅上涨了62个美金/吨。新加坡市场MGO柴油当月均价525美元/吨,环比上月的514美元/吨上涨了9个美金,涨幅为2%,价格走势较为平稳。
简介:作为中国远洋海运集团公益慈善事业的窗口与平台,中远海运慈善基金会积极响应党和国家号召,大力参与国家关于扶贫援藏的各项工作。截至2018年底,基金会投入扶贫援藏资金累计近2.8亿元,实施项目200多个。基金会在西藏洛隆、类乌齐等地开展援助工作,范围覆盖基础设施建设、民生工程、教育扶持、医疗卫生、产业扶持、干部培训、特困帮扶等领域。其中,新农村示范点建设项目有效改善了当地群众的生活环境;无动力饮水项目为当地群众提供了清洁便利的饮水条件;学校基础设施建设有效改善了当地师生的教学环境;'中远海运-格桑美朵'助学基金为贫困学子圆求学之梦助力;特色产业扶持为当地特色产品提供了生产加工平台并一定程度解决了就业问题;农民技能培训项目为当地群众提供了新的就业可能;中青年干部培训为当地培养本地化人才等。
简介:中远海运博鳌公司是中国远洋海运集团所属二级单位,是一家集旅游、商务、会议、休闲、度假、购物为一体的国际综合性企业。公司拥有博鳌亚洲论坛国际会议中心;三家五星级酒店;一座国际领先、国内一流的博鳌亚洲论坛新闻中心。自2001年博鳌亚洲论坛成立以来,公司作为论坛服务保障核心单位,已连续成功承办16届年会,先后承接4500多场国际性大型会议,包括多家世界500强企业,接待游客1500万人次,树立了国际一流服务品牌,受到国际组织以及国内外政要嘉宾一致好评。在中国远洋海运集团的正确领导下,公司坚持'以情服务用心做事'的企业精神,竭诚为社会和集团各兄弟单位提供优质高效的专业化服务。