直叶桨型科考船艉部振动  

Vibration Modal Analysis of Stern Structure for Scientific Research Ship with VSP

作　　者：刘西安[1] 吴广明[1] 李伟杰[1] 

机构地区：[1]中国舰船研究设计中心,上海201108

出　　处：《船海工程》2017年第6期32-37,共6页Ship & Ocean Engineering

摘　　要：针对某直叶桨科考船,运用有限元法,参考CCS《船舶振动控制指南》的相关要求,对其艉部区域振动固有频率进行计算,研究甲板板架、船底板架和舱壁板架固有频率计算的边界条件。讨论使用艉部舱段模型计算艉部固有频率的建模范围和附连水施加方法。结果表明,对于甲板,板架垂向建模范围要延伸到二甲板处;船底板架,垂向建模范围要延伸到平台处;横舱壁建模范围在纵向要延伸3个肋位。采用局部舱段模型计算艉部固有频率时,推荐建模范围为1/4船长;流固耦合法和刘易斯法2种附连水施加方法计算结果差异较大,推荐使用流固耦合法。The stern natural frequency of the scientific research ship with VSP was checked with FEM, referring to the relevant requirement of the CCS Guide for Ship Vibration Control. The influence of boundary conditions were discussed when the natural frequency of deck plate, bottom plate rack and bulkhead frame were calculated. Different stern cabin models were used to analyze the impact of modeling range on the natural frequency. Lewis method and virtual mass method were both used to consider the influence of outside water upon the wet modal. The results showed that the range FEM of deck rank extended to the second deck in vertical. The range of bottom rank extended to near deck in vertical. The range of bulkhead frame extended to 3 framespaces in longitudinal. When the stern cabin model was used to analyze the natural frequency, the reasonable range of the local FEM was 1/4L. The result of the stern cabin model applying the added mass by Lewis method was different greatly from that by fluid-structure interaction method, and the latter was recommended.

关 键 词：艉部振动 模态分析 有限元法 附连水质量 流固耦合法 

分 类 号：U661.44[交通运输工程—船舶及航道工程]