焊接热效应对船舶动力学性能影响的有限元分析  

Influence analysis of welding thermal effect on hull dynamic performance

作　　者：陈章兰[1,2] 叶家玮[2] 

机构地区：[1]集美大学轮机工程学院,福建厦门361021 [2]华南理工大学土木与交通学院,广州510090

出　　处：《大连海事大学学报》2013年第2期53-56,共4页Journal of Dalian Maritime University

基　　金：福建省自然科学基金资助项目(2011J01326)

摘　　要：采用有限元方法,从理论上推导了焊接热效应对船体结构动力学性能影响的有限元分析表达式,并通过典型算例的数值模拟论证了表达式的正确性,进而验证了焊接热效应对船体结构动力学性能的影响.从焊缝区域具有初始应力与应变的本构方程出发,应用虚功原理,推导出包含焊接热效应的有限元模态分析方程.以686TEU集装箱船为例,通过在大合拢缝横剖面上施加不同水平的名义焊接残余应力,运行船体结构模态分析并提取模态数据.与无焊接热效应时模态对比,船台大合拢缝的焊接热效应改变了同节点数的1阶固有频率.理论推导和数值模拟结果对船体振动控制具有一定的参考价值.The influence of welding thermal effect on dynamical performance of ship structure is analyzed by FEM method and verified by typical example. Based on the formula of stress and strain, the stiffness matrix and the formula for modal analysis in- cluding welding thermal effect are developed by applying the principle of visual work. The developed equation testifies that welding thermal effect accounts for the dynamical performance of structure theoretically. Taking 686 TEU container vessel as typi- cal example, its vibration modes with the presence of welding thermal effect or not are extracted and inhibited. The frequencies comparison of same-node and first order shows that natural fre- quencies would be changed with the welding thermal effect. Re-search result indicates that thermal effects influence on the be- havior of vibration and could not be ignored if accuracy of vibra- tion control of hull structure is deemed necessary.

关 键 词：船舶 焊接热效应 动力学性能 有限元分析 

分 类 号：U661.4[交通运输工程—船舶及航道工程]