矩形弹性壳液耦合系统的模态试验分析  

EXPERIMENT MODAL ANALYSIS ON RECTANGULAR ELASTIC FLUID-FILLED SHELL

作　　者：张素侠[1] 刘习军[1] 贾启芬[1] 王霞[1] 

机构地区：[1]天津大学机械工程学院力学系,天津300072

出　　处：《机械强度》2004年第6期615-619,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目 (1 0 1 72 0 64)。

摘　　要：通过对矩形弹性壳液耦合系统的模态试验分析 ,得到分析频率范围内的四阶主振型 ;改变水的深度 ,得到系统频率与水的深度关系曲线 ;在进行系统的激振试验时 ,发现在一定的激励频率时 ,液体表面将出现大幅低频重力波现象。An experimental study for a rectangular elastic fluid-filled shell system is presented. It is found that large magnitude and low frequency gravity waves will appear when the system is excited on the shell with acertain frequency. In order to study the vibration characteristics for this kind of symmetric-elastic-thin fluid-filled shell system with free surface in detail, a modal experiment is conducted and four lowest modal shapes within the analytical range are obtained firstly. The second, the curve to demonstrate the relation between the water level and system natural frequency is presented, too, which indicates that the depth of the water doesn't affect the movement form of the system, and the natural frequency of the system will reduce with the decrease of the water depth. At last, a large magnitude and low frequency gravity wave experiment is done and gravity waves are observed when the frequency of the excitation is the component of the natural frequency of shell and water. The conclusion of combined vibration is drawn and some data are obtained. All of these will offer preference for the further theoretical study.

关 键 词：壳液耦合 矩形壳 试验模态分析 重力波 

分 类 号：O323[理学—一般力学与力学基础]