基于水动力-结构模型的波浪载荷计算方法

摘要

In order to recalculate the hydrodynamic pressure on the structural meshes robustly and accurately, a new calculating method of wave loads consistent with structural analysis has been presented. In accordance with the line-ar potential flow theory and the three-dimensional calculating method of wave loads in frequency domain, the boundary integral equation based on the hydro-structural model was established to solve the velocity potential on the structural nodes. This model can calculate the hydrodynamic pressure on structural meshes directly. Then the wave pressure calculating and automatic loading program were developed, which are applicable to the universal finite ele-ment method (FEM) solver MSC.NASTRAN. Finally, the hydrodynamic calculation and structural analysis of a re-plenishment ship were completed. The results indicate that the method proposed in this paper can obviously improve the equilibrium of the structural model, and can obtain more reasonable and reliable results for structural respon-ses, having significant application value for the engineering field.%为了更精确地计算分布于结构网格上的水动压力，提出了一种与结构分析协调的波浪载荷计算方法。依据线性势流理论，采用三维频域波浪载荷计算方法，建立了水动力-结构模型的边界积分方程求解结构网格控制点的速度势，实现水动压力在结构单元上的直接计算。开发了适合通用有限元分析软件MSC．NASTRAN的波浪压力直接计算及自动加载程序。最后，对某补给船进行了水动力计算和结构分析，对比结果表明，研究方法可以很大程度上改善结构模型的平衡性，使结构响应结果更合理可靠，具有较大的工程实用价值。