船舶与海洋工程
船舶與海洋工程
선박여해양공정
Shanghai Shipbuilding
2014年
2期
9-11,14
,共4页
三体船%有限元%迁移矩阵法%总振动%固有频率
三體船%有限元%遷移矩陣法%總振動%固有頻率
삼체선%유한원%천이구진법%총진동%고유빈솔
trimaran%finite element%transfer matrix method%global vibration%natural frequency
三体船的结构与常规船差别很大，其总振动呈现有别于常规船型的振动特性。针对某型三体船进行总振动分析，先采用三维有限元法进行预报，再采用迁移矩阵法进行简化预报，探讨了三体船模态计算时的片体刚度缩减。结果证明，只有采用整船三维有限元法才可获取三体船复杂振动特性。但在设计的早期阶段，可将片体刚度按一定比例合并至主体中，再采用迁移矩阵法预报，进而快速进行三体船振动模态预报，同时预报误差可控制在较小范围内，有利于设计的早期阶段进行结构设计方案论证分析。
三體船的結構與常規船差彆很大，其總振動呈現有彆于常規船型的振動特性。針對某型三體船進行總振動分析，先採用三維有限元法進行預報，再採用遷移矩陣法進行簡化預報，探討瞭三體船模態計算時的片體剛度縮減。結果證明，隻有採用整船三維有限元法纔可穫取三體船複雜振動特性。但在設計的早期階段，可將片體剛度按一定比例閤併至主體中，再採用遷移矩陣法預報，進而快速進行三體船振動模態預報，同時預報誤差可控製在較小範圍內，有利于設計的早期階段進行結構設計方案論證分析。
삼체선적결구여상규선차별흔대，기총진동정현유별우상규선형적진동특성。침대모형삼체선진행총진동분석，선채용삼유유한원법진행예보，재채용천이구진법진행간화예보，탐토료삼체선모태계산시적편체강도축감。결과증명，지유채용정선삼유유한원법재가획취삼체선복잡진동특성。단재설계적조기계단，가장편체강도안일정비례합병지주체중，재채용천이구진법예보，진이쾌속진행삼체선진동모태예보，동시예보오차가공제재교소범위내，유리우설계적조기계단진행결구설계방안론증분석。
The structure of trimarans is much different from that of conventional ships. Therefore its global vibration characteristics is also different. Aiming at the global vibration analysis of a trimaran, this study adopts first the 3D finite element method for prediction, then uses the transfer matrix method to simplify the prediction, and discusses the demihull stiffness reduction during the trimaran modal calculation. The results show that, only when the entire ship 3D finite element method is adopted the complex vibration characteristics of a trimara can be obtained. But in the early stage of design, the demihull stiffness can be included into the main hull by a certain percentage, then the transfer matrix method can be used for the rapid trimaran vibration modal prediction, meanwhile maintaining the error within a relatively small range, which is quite beneficial for the structural design feasibility analysis in the early stage.
