新型激光雷达浮标运动响应特性数值研究

Numerical investigation on the dynamic response of a novel FLiDAR buoy

以新型激光雷达浮标系统为研究对象,基于ANSYS/AQWA开展了激光雷达浮标系统运动响应特性数值研究,研究了浮标吃水深度、形状参数对于激光雷达浮标运动响应的影响规律,分析了附加质量、辐射阻尼、运动响应RAO及一阶、二阶波浪力等水动力参数。采用时域分析方法对不同风浪流荷载入射角度下的激光雷达浮标锚泊系统张力特性进行了计算分析。研究结果表明:随着浮标吃水深度的增加,浮标纵荡方向响应无明显变化,垂荡响应显著增大;随着浮标底部圆台直径的增大,浮标纵荡方向响应变化较小,而圆柱形浮标垂荡运动响应显著大于圆台形浮标;当浮标系泊锚链发生松弛—张紧状态变化时易出现极端张力,且极端张力出现的幅值和频率随有效波高的增大和谱峰周期的减小而增大。

Numerical investigation on the dynamic response of a novel FLiDAR buoy is performed based on the ANSYS/AQWA software.The effects of buoy drifts and buoy shapes on the motion response of FLiDAR buoy are analyzed.The hydrodynamic performance of the FLiDAR buoy system is analyzed to obtain the additional mass,radiation damping,RAOs,wave excitation force and second wave excitation force,etc.Meanwhile,the mooring chain tension of the FLiDAR buoy system is analyzed under different incident angles of wind,wave and current loads with the time-domain method.The results show that as the buoy draft increases,the sway response does not change significantly,while the heave response increases significantly.As the diameter of the bottom of the buoy increases,the sway response has little change,while the heave response of the cylinder buoy is significantly larger than that of a circular truncated cone buoy.When the buoy mooring chain changes between its slack and taut configuration,the extreme tension is easily to be induced.The amplitude and frequency of extreme tension increase with the increasing of the significant wave heights and peak wave periods.