不同介质中多舱段复杂壳体的振动模态特性研究  

Study of Vibration Mode Characteristic of Multi-Cabin Shell in Different Media

作　　者：陈明[1,2] 钱家昌[2] 曹为午[2] 

机构地区：[1]上海交通大学船舶海洋与建工学院,上海200240 [2]武汉第二船舶设计研究所,武汉430064

出　　处：《噪声与振动控制》2009年第2期1-5,87,共6页Noise and Vibration Control

摘　　要：对流固耦合条件下结构模态特性的计算方法进行研究;设计一典型多舱段壳体结构模型,对该模型在空气和水中的振动模态特性进行计算,对比了"干"、"湿"模态之间的差异。结果表明,不同介质中的典型多舱段壳体结构振动模态特性差别较大,水中一阶垂向弯曲振动模态频率比空气中降低约30%,模态振型出现交错现象,各阶模态的模态附连水质量与模态振型有关。The computation method of characteristics of vibration mode considering the fluid-structure coupling effect is studied. Then a typical complicated multi-cabin shell structure, relatively similar to real structure, is designed. FE modeling and analysis of vibration modes of the typical multi-cabin model both in the air and water are carried out. The difference between the ＂dry＂ and ＂wet＂ modes is found. The results show that in different media the vibration characteristics of the typical multi-cabin shell differ from one another greatly. The first frequency of vertical vibration mode in the water reduces 30% compared with that in the air. The mode shapes intervene each other, and the attached water mass of different modes is related to the mode shape of the structure.

关 键 词：振动与波 多舱段结构 振动模态 附连水质量 

分 类 号：O661.44[理学—分析化学]