波浪浪向角对多体浮式平台水动力性能的影响

Hydrodynamic response analysis of multi-body floating platform in different wave direction angles

以弱非线性连接的长链式海上平台为研究对象,基于网络动力学方法,将平台视作由多个相互耦合子单元模块组成的结构网络,利用边界元法求解近海波浪参数,最后通过龙格库塔迭代法得到不同波浪浪向角下浮式平台的运动响应情况。结果表明:浮式平台在横浪情况下的幅值响应区域远大于顺浪情况,这表明了在横浪情况下更难寻找到合适的固有频率。通过时域分析可以得知,浮式平台的最大振幅方向出现在横荡区域,其在横浪情况下受到系统内部弯曲共振的影响最为明显,且在特定的浪向角下会发生明显的幅值阶跃现象。

A multi-body offshore platforms with weak nonlinear link chain was taken into consideration in this research.Thinking floating piers as mutual coupling units of network structure,boundary element method(BEM)can be used to obtain wave parameters,then floating platform s time domain response in different wave angles can be calculated by Runge-Kutta iteration method.The result of numerical calculation shows that the amplitude response area in beam waves is obviously greater than that in following waves,indicating that it is more difficult to find the frequency of non-response region in a situation of beam wave.In analysis of time domain responses,the max amplitude is sway in beam wave,and since sway in beam wave is significantly affected by bending resonance of internal system,jump of amplitude can be easily observed in specific wave angles.