超大型浮体结构考虑非线性项的波浪力响应计算

为求解超大型浮体结构波浪响应问题,将其简化成弹性梁板模型。以有限元软件为基础来建立超大型浮体结构的弹性梁板模型,在势流理论的基础上,将速度势分解为入射势、绕射势和辐射势三部分,并利用格林函数法推导出一阶、二阶波浪速度势的表达式。以此为理论基础,编制了相应的计算程序来计算浮体结构所受到的二阶波浪力,最后建立了梁板模型的水弹性响应方程,对非线性波浪力作用下的浮体结构的水弹性响应进行求解分析,并分析了波向对响应振幅的影响。

Analysis of hydroelastic responses of very large floating structure on nonlinear wave force

In this paper, the very large floating structure was simplified into a model of elastic beam to analyze the problems of its hydroelastic response. Based on the finite element software, the sandwich in order grillage model was set up. After dividing the velocity potential into three parts： the incident potential, diffraction potential and radiation potential, the expressions of the first and the second order velocity potential were derived by using Green Function method. On this basis, a fern program has been established to calculate the second order wave forces. At last the hydroelastic response function of the VLFS was founded and solved based on potential fluid theory. And the responsive amplitudes affected by wave direction were presented.