中文摘要：

提出了基于二次脉冲响应函数法的海上浮式风电机浮式平台二阶水动力计算方法,该方法基于三维势流理论用直接积分法求浮式平台的二次传递函数,并结合波高时程,将二次脉冲响应函数法应用于浮式平台二阶水动力的计算。把计算所得二阶水动力施加到海上浮式风电机整机时域动力学计算模型,计算二阶水动力的激励响应。以DeepCwind半潜式平台为算例,其上支撑美国可再生能源实验室5MW参考风机。先对所提出的二阶水动力计算方法进行验证,再分别在无风和有风条件下,计算一阶水动力单独激励响应和一阶二阶水动力共同激励响应,通过对比响应幅值谱、响应统计值,分析二阶水动力的激励特性。结果表明,对于半潜式平台,慢漂力和平均漂移力有明显的激励作用,和频二阶水动力的激励作用可以忽略。

英文摘要：

A second-order hydrodynamics computation method was proposed based on the quadratic impulse response function technique for offshore floating wind turbines.Firstly,the quadratic transfer functions were calculated using the direct integration method through three-dimensional potential theory.Secondly,the quadratic impulse response function technique was applied to compute the second-order hydrodynamics in terms of the quadratic transfer functions and wave elevation.Lastly,the resulting second-order hydrodynamics was acted on the integrated dynamics model of offshore floating wind turbine in time domain.So the excitation response of the second-order hydrodynamics might be computed.Taking the DeepCwind semi-submersible platform supporting the NREL 5-MW offshore baseline wind turbine for case,the verification of the second-order hydrodynamics computation method presented was conducted,and various excitation responses were calculated and analyzed.The results show the slow drift force and mean drift force have notable influences on semi-submersible platform,but the sum frequency second-order force can be neglected.