浅水域中圆柱壳固有振动特性分析  

Frequency Analysis of a Cylindrical Shell Immersed in Shallow Water

作　　者：王鹏[1] 李天匀[1] 朱翔[1] 张冠军[1] 缪宇跃[1] 

机构地区：[1]华中科技大学船舶与海洋工程学院,武汉430074

出　　处：《中国造船》2016年第3期72-82,共11页Shipbuilding of China

基　　金：国家自然科学基金(51379083;51479079;51579109);高等学校博士学科点专项科研基金(20120142110051)

摘　　要：基于波传播法和虚源法分析浅水域中圆柱壳的固有振动特性,并考虑了浅水域上下边界的影响。将理论计算与已有试验结果进行对比分析,验证了计算方法的有效性。数值计算表明:当圆柱壳靠近自由液面(或刚性壁面)时,耦合模态频率相应增大(减小);当水深相对较小时,浅水域影响显著;当水深小于壳体半径的8倍时,浅水域对耦合模态频率的影响不可忽略。Free flexural vibration of a cylindrical shell submerged in shallow water is studied with the help of wave propagation approach and image method. Effects of both upper and lower fluid boundaries are considered. Accuracy of the present method is verified through comparison with available experimental works. When the shell is close to the free surface （or rigid wall）, coupled modal frequency will increase （or decrease）. The effect of shallow water on coupled modal frequencies is significant when immersion depth of the shell is relatively small. When water depth is smaller than 8 times of shell radius, the influence of shallow water could not be ignored.

关 键 词：圆柱壳 浅水域 自由液面 刚性壁面 自由振动 虚源法 

分 类 号：U661.43[交通运输工程—船舶及航道工程]