三锚系大型浮标运动响应特性数值研究

Numerical investigation on the dynamic responses of three-anchor large-scale buoy

以三锚系浮标系统为研究对象,基于AQWA与OrcaFlex软件开展了三锚系大型浮标系统运动响应特性数值模拟研究。对直径10 m的浮标结构在波浪荷载下的水动力特性进行研究,校核了浮标的初稳性和大倾角稳性特征,计算分析了浮标的附加质量、辐射阻尼、运动响应幅值算子RAO等水动力参数,阐明了不同风、浪、流工况下三锚系浮标与辅助浮筒的运动响应特性,揭示了浮标三锚链导缆孔处锚泊张力随入射角度、波高和周期等的变化规律。研究结果表明:该浮标稳性和随波性能较好。与无浮筒三锚系浮标相比,带辅助浮筒的三锚系浮标系统的运动响应和锚泊张力减小,随着波高和周期增大,三锚系浮标系泊锚链的极端张力值逐渐增大,尤其是在极端海况下,迎浪向锚链极端张力急剧增大。

A series of numerical simulations of dynamic response of three-anchor large-scale buoy system were performed based on the AQWA and OrcaFlex software.The hydrodynamic characteristics of the buoy structure with a diameter of 10 m under wave load were studied,the initial stability and large inclination stability characteristics of the buoy were checked,and the hydrodynamic parameters of the buoy such as the added mass,radiation damping,motion response amplitude operator RAO were calculated and analyzed.The motion response of the three-anchor buoy system and auxiliary buoy under different wave conditions were investigated.The variations of mooring tensions at three-anchor chain fairlead point with different incident angles,wave heights and wave periods were illustrated.The results show that the buoy has good stability and wave following performance.Compared to the cases of the buoy without auxiliary buoy,the motion response and tension force at the fairlead position of three-anchor buoy system with auxiliary buoy decrease.With the increase of wave height and wave period,the extreme tension of the mooring chain increases significantly,especially for those in accordance with the incident angle of 180°under the extreme environment.