复合材料加筋结构的流固耦合振动及动力响应分析

本文通过引用阻尼单元刚度阵法,并用结构有限元与流体边界元相结合的方法对复合材料结构的流固耦合振动及动力响应问题进行研究,较好地反映了复合材料结构动力响应特征。采用修正的RITZ向量法和Newmark直接积分法求解振动及动力响应问题,避免了质量阵因附连水质量阵不对称而引起的求解困难。作为数值分析例子,文中分别计算了船体悬臂板与加筋板结构的自由振动与动力响应问题,并对一复合材料舱段进行了水下爆炸当量载荷的振动与响应计算。

FLUID STRUCTURE INTERACTION VIBRATION AND DYNAMIC RESPONSE OF COMPOSITE STIFFENED STRUCTURES

The fluid structure interaction vibration of stiffened structures is studied by using the method combining the finite element (FEM) with the boundary element (BEM). During the calculation, the damp stiffness of the structure is considered. A modified RITZ vector method and Newmark direct integral method are employed to overcome the difficulties of the numerical analysis caused by the unsymmetrical added mass. For numerical examples, the vibration and response of the composite cantilever plates and stiffened structures are analysed. Moreover, the effect of underwater explosion on a composite shiphull is given.