双层旋转壳流固耦合振动有限元分析

本文采用旋转壳体元和流体元分析了双层旋转壳体流固耦合振动特性,基于Novozhilov壳体理论、水弹性理论以及Hamilton变分原理推导出耦合系统运动方程,计算结果与实测值比较表明本分析方法有较好的精度。

Vibration Analysis of Fluid-Structure Interaction for Rotary Double-Shell Using Finite Element

The vibration characteristics of a submerged rotary double-shell is analyzed using rotary shell element and fluid element. The coupling between the double-shell system and acoustic medium is taken into account by fluid finite elements for the fluid field between the inner and outer shells, and by the boundary elements for the fluid field outside the shell. The energy functional of the structural system is worked out by D'Alembert principle. A frequency e-quation for the motion system is obtained by the Novozhilov's shell theory and the Hamilton variational principle. Fair agreement is seen between the measured and predicted natural frequencies of the rotary double-shell system both in air and in water.