随机风-浪一体化降维建模及风机结构可靠度研究

基于随机脉动风场和随机波浪力场的谱表示降维模拟方法，采用脉动风速Davenport谱与波浪P-M谱对风、浪谱参数进行一体化构造，并应用相同的基本随机变量来保障风、浪模拟的概率信息一致，实现了随机风-浪一体化降维建模。进一步，基于ANSYS有限元软件建立了近海风机塔架数值计算模型，并以顶点位移为指标，进行了三种工况下结构的动力可靠度分析。数值算例验证了随机风-浪一体化降维建模方法的有效性。结构动力分析结果表明，风荷载对风机塔架顶点位移响应的影响占主导地位，同时波浪荷载的作用亦不可忽略。此外，随机风-浪一体化降维方法生成的代表性样本概率信息完备，可与概率密度演化理论结合实现海工结构在风浪共同作用下的精细化动力响应及可靠度分析。

Research on integrated dimension-reduction modeling of stochastic wind-wave and reliability of offshore wind turbines

Based on the spectral representation dimension-reduction method of stochastic fluctuating wind field and wave force field,the fluctuating wind speed Davenport spectrum and wave P-M spectrum are used to construct the wind and wave spectral parameters,and the same elementary random variables are applied to ensure the consistency of probability information of wind and wave,so as to realize the integrated dimension-reduction modeling of stochastic wind-wave field.Furthermore,based on finite element software ANSYS,the numerical model of an offshore wind turbine tower is established,and the dynamic reliability of the structure under three working conditions is analyzed with the top displacement as the index.Numerical examples verify the effectiveness of the proposed integrated dimension-reduction modeling method for stochastic wind-wave field.The structural dynamic analysis shows that the influence of wind load on the top displacement response of the wind turbine tower is dominant,and the effect of wave load cannot be ignored.In addition,the probability information of representative samples generated by the integrated dimension-reduction method is complete,which can be combined with the probability density evolution theory to realize the refined dynamic response and reliability analysis of offshore structures subjected to the combined action of wind and wave.