大型浮体水动力响应特性数值模拟及减摇措施

Numerical simulation of hydrodynamic response and anti-rocking measures ofthe large floating structure

为研究马尔代夫海域大型浮体水动力响应特性及减摇措施,基于三维势流理论和刚体运动方程建立了浮箱水动力响应数值模型,分析了不同纵横比浮箱的水动力响应特性,讨论了减摇板布置方式及形式对浮箱减摇效果的影响,并在此基础上给出了较优的减摇板布设方案。结果表明:纵横比为2∶1的矩形浮箱在各个浪向下的运动响应相对平稳;减摇板宽度对浮箱横摇的控制作用较明显;浮箱迎、背浪面同时安装减摇板时减摇效果受安装高度影响显著;对于迎浪侧的双层开孔减摇板,上层减摇板开度40%时对浮箱横摇控制较好,浮箱横摇有义值极限海况下可降低16.9%,建议优先选用上层带开度的单侧双层减摇板布设形式。安装减摇板对波浪作用下浮体结构强度影响较小,应着重关注减摇板与外壳的连接强度。

In order to study the hydrodynamic response characteristics and anti-rocking measures of large floating bodies in the waters of Maldives,a numerical model of hydrodynamic response of floating tanks is established based on the three-dimensional potential flow theory and the rigid-body motion equation,the hydrodynamic response characteristics of floating tanks with different aspect ratios are analyzed,the influence of anti-shake plate layout and type on the anti-rocking effect of floating tanks is discussed,and a better layout scheme of anti-shake plates is given on this basis.The results show that the rectangular floating box with an aspect ratio of 2∶1 has a relatively stable motion response in each wave.The width of the anti-shake plate has an obvious control effect on the floating box,and when the anti-shake plate is installed at the same time on the floating box and the back wave surface,the anti-rocking effect is significantly affected by the installation height.For the double-layer open-hole anti-rocking plate on the facing side,when the opening of the upper anti-shake plate is 40%,the control over the rocking of the floating box is better,and the rollover of the floating box can be reduced by 16.9%under the limit sea state.This study recommends the single-sided double-layer anti-rocking plate layout form with the opening of the upper layer.The installation of the anti-shake plate has little effect on the strength of the floating structure under the action of waves,and attention should be paid to the connection strength of the anti-shake plate and the shell.