简介:Theextendingofacantileverandtransversemovingofadrillingfloorenablethejack-uptooperateinseveralwellpositionsaftertheJack-uphaspitched.Thecantileverallowableloadnephogramisthecriticalreferencewhichcanevaluatethejack-up’sdrillingability,designthecantileverstructureandinstructajack-upmanagertomaketheoperationssafe.Theintentofthispaperistoexploretheinterrelationshipsbetweenthecantileverposition,drillingfloorandtheloadsincludingwindforce,thestandset-backweightetc.,throughanalyzingthestructureandloadcharacteristicsofthex-typecantileverandthesimplifiedmechanicsmodelwiththerestrictionofthemaximummomentcapacityofthecantileversinglesidebeam.Referringtoseveraltypicalpositiondesignsloadvalues,thecantileverallowableloadnephogramisobtainedbyusingthesuitableinterpolationmethod.Thepapergivesamethodforcantileverallowableloaddesign,whichisprovedreliableandeffectivebythecalculationexample.
简介:超大型全冷式液化气船(VLGC)是液化气船中结构最为复杂的船型,其结构设计是该高附加值船型的关键点和难点。从VLGC结构设计的角度,阐述了中横剖面设计、温度场计算、菱形液舱设计、支承系统设计、结构布置、低温钢焊接、晃荡分析及有限元强度和振动分析等,通过近600项工艺评定,攻克了关键技术。这些研究为该型船舶的成功研制和实船建造打下了坚实基础。
简介:通过对HXD2型交流传动电力机车抱轴箱轴承故障及剥离情况进行统计,分析抱轴箱轴承发生剥离的原因,论述采取粘贴温度试纸、对未能安排进行两年栓的HXD2型机车在增做年检时对机车抱轴箱横动量进行车上测量、加强抱轴箱的日常整备检查、机车乘务员在机车运行中密切注意走行部状况等改进措施,保证大秦线重载运输安全。