简介：Inconsideringthetheoryofstructuraldynamicoptimizationdesign,adesignmethodofthestructuralstyleofshipcompositebracewithrigidvibrationisolationmasswasstudied.Twokindsofstructuraldynamicoptimizationformulationsminimizingthevibrationaccelerationofthenon-pressurehullontherestrainingconditionofthegrossweightoftheshipcabinwereestablished:1)dynamicoptimizationofthesectionaldimensionsoftherigidvibrationisolationmassinthecompositebrace;2)dynamicoptimizationofthearrangingpositionoftherigidvibrationisolationmass.Throughtheoptimizationresults,sectionaldimensionsandthearrangingpositionoftherigidvibrationisolationmasswithbetterperformanceinreducingvibrationweregained,andsomereferencewasprovidedforpracticalengineeringdesignsaswellasenrichmentofthedesignmethodofanovelshipvibration-isolationbrace.

简介：Rigidblockingmassesarelocatedinthetypicalbasestructureofapowercabinbasedontheimpedancemismatchprinciple.Bycombiningtheacoustic-structuralcouplingmethodandstatisticalenergyanalysis,thefull-bandvibrationandsoundradiationreductioneffectofvibrationisolationmasseslocatedinabasestructurewasresearched.Theinfluenceoftheblockingmass’cross-sectionsizeandshapeparametersandthelayoutlocationofthebaseisolationperformancewasdiscussed.Furthermore,theeffectivenessofrigidvibrationisolationdesignofthebasestructurewasvalidated.Theresultsshowthatthemediumandhighfrequencyvibrationandsoundradiationofapowercabinareeffectivelyreducedbyablockingmass.Concerningweightincrementandsectionrequirement,suitablyincreasingtheblockingmasssizeandsectionheightandreducingsectionwidthcanresultinanefficiency-costratio.

简介：根据《中华人民共和国船舶签证管理规则》（交通部令2007年第7号）第2条规定，船舶签证，是指海事管理机构根据船舶或者其经营人的申请，经依法审查，对符合船舶签证条件的，准予其航行的行政许可行为。其实，早在一千多年前的宋朝，就有海事管理机构——市舶司，进行“船舶签证”——公据。

简介：

简介：Basedontheprincipleofimpedancemismatching,theperformanceofrigidvibrationisolationmassinimpedingvibrationwavepropagationwasdiscussedfromtheperspectiveofwaveapproach.BasedonFEM,theinfluenceofitsweightaswellasthecross-sectionshapeparametersontheisolationperformanceofrigidvibrationisolationmasswasstudiedthroughnumericalsimulation.Theresultsshowthatrigidvibrationisolationmasscaneffectivelyimpedethepropagationofthemediumandhighfrequencyvibrationwaves,andtheheavierthevibrationisolationmass,thebettertheisolationperformance.Forlowfrequencywaves,thevibrationisolationeffectisnotsoobvious;forarectangularvibrationisolationmass,theisolationperformancecouldbeeffectivelyimprovedbyincreasingthecross-sectionheightandreducingthecross-sectionwidth.Ausefulreferencewasprovidedfortheapplicationofrigidvibrationisolationmassestothevibrationisolationandnoisereductionofshipstructure.

简介：5月，油价未得到提振，运价反而受原油出口量下降预期的影响持续回落。尽管美国石油库存有所下降，但在国内页岩油复产的背景下，进口需求并未得到推动。亚洲炼厂夏季检修带来的需求疲软，进一步增大了消化前期集结运力的难度，而船东消极的拆船行为也无益于运价的修复。

简介：利用Matlab工具箱编写程序对MTU16V396TC53柴油发电机组的双层隔振系统进行计算,分析了采用不同中间质量、钟状罩刚度、上下减震器的刚度及减振器阻尼系数等对隔振效果的影响,为该机组的隔振器选用提供参考依据.

简介：2006年5月13日16：30时，在“4·12”沉船事故中沉没在长江中游金口水道军山大桥下2公里处的明兴6号轮，历经近一个月时间的艰辛努力，终于被成功打捞出水。

简介：上海市2011年和2012年重大工程项目——上海海事大学教学实习船建造项目圆满完成。由中国海运集团所属中海工业公司承建的4．8万吨世界最先进远洋教学实习船于2012年12月12日在上海港国际客运中心码头正式交付上海海事大学。这是上海海事大学创新人才培养模式，提升教学科研水平，主动服务上海国际航运中心建设的有力举措。交通运输部副部长高宏峰，上海市委副书记殷一璀、副市长沈晓明，联合国国际海事组织海上安全司副司长Mahapatra先生，中国海运集团董事长李绍德、总经理许立荣等出席交船仪式并考察教学实习船。