具有内域的双层加筋圆柱壳动响应特性

采用外域双渐近法模拟外部流体域，内域双渐近法模拟内部流体域，采用非线性有限元软件ABAQUS 模拟结构，建立流固耦合数值模型并验证了其有效性. 利用建立的数值模型研究内部流体对双层加筋圆柱壳动响应的影响. 研究结果表明:一阶双渐近的解在中后期振荡周期变短、幅值变小，而二阶双渐近的解与解析解吻合良好；内部流体的存在减弱了双层加筋圆柱壳外壳的塑性变形，对其内壳塑性变形的影响较小；内部流体的存在减弱了双层加筋圆柱壳的速度响应. 

DYNAMIC RESPONSE OF DOUBLE RING-STIFFENED CYLINDRICAL SHELL WITH INTERNAL FLUID

In this paper, a numerical model on fluid-structure interaction is established and the validation of the model is carried out. The doubly asymptotic approximation for external domain is used to model the external fluid, the doubly asymptotic approximation for internal domain is used to model the internal fluid and the nonlinear finite element software ABAQUS is employed to model the structure. Based on the numerical model, the influence of internal fluid to the dynamic response of double ring-stiffened cylindrical shell is investigated. The main results are as follows. Compared with the analytic solution, the oscillation period and amplitude of late time response obtained by the first order doubly asymptotic approximation decrease. But, the solution of the second order doubly asymptotic approximation agrees well with the analytic solution. The existence of internal fluid makes the plastic deformation and velocity response of double ring-stiffened cylindrical shell decrease.