波浪作用下铰接式层合浮体的水弹性响应研究

Study on the hydroelastic response of articulated floating sandwich structures under wave action

在工程设计中,通常采用模块化方式制造超大型浮式结构物,将巨大的单体结构分割成多个较小模块,后期通过合适的连接器拼装形成。为了明确多模块超大浮体在波浪作用下的水弹性响应,以两个相邻层合浮体(高刚度面板和低密度芯材)为研究对象,建立波浪作用下铰接层合浮体水弹性响应的高阶势流模型。采用匹配特征函数展开法求解流体运动的速度势,探讨了铰接处弹簧刚度对浮体的反射系数、透射系数、挠度、弯矩和剪力的影响规律。研究结果表明:迎浪侧浮体的存在可以有效降低背浪侧浮体的挠度、弯矩和剪力幅值;与垂直弹簧相比,扭转弹簧刚度的增加可以更加有效抑制铰接层合浮体的水弹性响应;当扭转弹簧刚度大于一定值时,继续增大弹簧刚度对浮体的动力响应不产生影响。

In engineering design,very large floating structures are usually manufactured in a modular way.This method divides a large monolithic structure into smaller modules,which are later assembled with appropriate connectors.In order to clarify the hydroelastic response of very large multi-module floating structures,a high-order potential flow model for the hydroelastic response of very large articulated floating sandwich structures under wave action is established by taking two adjacent sanwich floating structures(surface panels with large stiffness and core material with small density)as research objects.The matched eigenfunction expansion method is used to solve the velocity potential of fluid motion.The effect of spring stiffness on reflection coefficient,transmission coefficient,deflection,bending moment and shear force of floating structures is discussed.The results show that the amplitudes of deflection,bending moment and shear force of the leeside structure can be effectively reduced due to the presence of a seaside floating structure.Compared with the vertical spring,the increase of torsion spring stiffness can restrain the hydroelastic response of articulated floating structures more effectively.When the stiffness of torsion spring is greater than a certain value,further increasing the spring stiffness has no obvious effect on the structural dynamic response.