三体船总振动简化预报研究  

Study on the Simplified Prediction Method for Trimaran Global Vibration

作　　者：王显正[1] 刘见华[1] 

机构地区：[1]中国船舶及海洋工程设计研究院,上海200011

出　　处：《船舶与海洋工程》2014年第2期9-11,14,共4页Naval Architecture and Ocean Engineering

摘　　要：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。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.

关 键 词：三体船 有限元 迁移矩阵法 总振动 固有频率 

分 类 号：U661.44[交通运输工程—船舶及航道工程]