加筋板结构的自由振动分析加筋板的结构加.doc

加筋板结构的自由振动分析
黄海燕,王德禹
(上海交通大学船舶海洋与建筑工程学院,上海 200030)
摘要:为了提高加筋板结构振动响应的预报精度,建立了考虑板的剪切变形和旋转惯性以及梁偏心的加筋板结构的振动模型,并对板的偏心情形进行了阐述,同时编制了相应的计算程序,对算例的计算精度进行了比较分析,最后将其应用于船体结构的振动响应预报,并给出了相应的计算建议.
关键词:船舶力学;加筋板;振动分析;程序设计;二次开发
中图分类号: 文献标识码:A 文章编号:1000-6982 (2008) 06-0001-03
Free vibration analysis of the stiffened plate
HUANG Hai-yan, WANG De-yu
(College of Naval Architecture and Ocean Engineering, Shanghai Jiaotong University, Shanghai 200030, China)
Abstract: For the goal of improving predicted precision of vibration parameters about stiffened plate, a model is built including shear deformation and moment of inertia and eccentric beam. Then a set of program is developed. The accuracy of the proposed model is demonstrated with two examples. The analysis results of ship stern structure show that the model is not only feasible and reliable, but also well suited for use in actual vibration analysis problem of ship design.
Key words: ship mechanics; stiffened plate; vibration analysis; program design; further development
0 引言
加筋板结构是工程中最常见的结构之一,广泛应用于船舶与海洋工程、航空航天工程、土木工程、,由于板、梁构件的几何特性,:
1)将板的中面和梁的形心都放在节点上,,没有考虑梁偏心的影响,刚度偏小,应力分布偏于均匀,固有频率偏低.
2)将板的中面放在节点上,,考虑梁偏心的影响,但忽略了由于梁的存在而使结构中性轴下移的影响,从而导致其刚度比实际结构偏大,应力分布偏差更大,固有频率偏高.
事实上,板和梁是作为一个整体结构受力的,,由于梁的存在而使结构中性轴下移,致使