浮式风机在风浪联合作用下的动力响应分析

Dynamic response analysis of floating offshore wind turbine in combined wind and wave

为了研究浮式风机以及系缆张力响应问题,本文基于三维线性频域势流理论和脉冲响应函数方法计算时域波浪力,利用准静定系泊模型来模拟系泊力,通过叶素动量理论来计算风力,采用计算流体力学方法得到粘性阻尼系数,建立了风机在风浪联合作用下的时域运动方程。结果表明:在规则波与不规则波单独作用下的纵荡、垂荡响应与试验值相吻合,系缆张力响应则偏小于试验值;在不规则波与风联合作用下,所得的纵荡、垂荡响应在波频范围内与不规则波单独作用下的结果相差不大,而系缆张力响应则同样偏小于试验值。

Time-domain wave forces are solved based on three-dimensional linear frequency-domain potential theory and impulse response function method to study the problem of motion and mooring tansion response of floating offshore wind turbine(FOWT).Mooring forces are modeled by a quasi-static cable model,wind forces are calculated by blade element momentum(BEM)theory,and viscous damping coefficients are obtained by computational fluid dynamics method to establish the motion equation of FOWT involving wind and wave in time-domain.Results show that under the actions of regular and irregular waves,the surge and heave responses are consistent with the experimental results under the action of regular wave or irregular wave.The mooring tension response is lower than the experimental value.In the combined wind and irregular wave,the surge and heave responses are almost the same as that in the irregular waves within the wave frequency range,and the mooring tension response is lower than the experimental result.