深海漂浮式风力机整机结构动态特性建模与仿真

Dynamic Characteristics Modeling and Simulation of Entire Deep-sea Floating Wind Turbine

深海风力机因其役环境的复杂性,在产品开发阶段需要对各种载荷条件下的整机结构特性进行分析,并开发相应的分析或仿真系统。在已有研究基础上,开发了深海漂浮式风力机整机仿真系统,该系统主要由风力机气动模块、漂浮式海洋平台水动力模块和整机结构动力学模块三部分组成。其仿真算法核心为采用动态子结构法将水动力载荷与气动载荷同时加载到整机结构动力学模块界面上,实现气动和水动耦合条件下结构动力学特性的求解。为检验仿真模型的可信性,利用该系统对NREL基准的5MW漂浮式风力机进行结构动力学仿真分析。结果表明该模型可以求解气动和水动耦合条件下结构动力学问题。同时,研究表明深海漂浮式风力机在风与海浪载荷条件下,其漂浮式平台会产生相应的摇荡运动,气动与水动力载荷相互耦合对结构动力响应及功率波动有着显著影响。

Because of the operating environment complexity of deep-sea Floating Wind Turbine, it is necessary to calculate and analyze the whole structure characteristics under different loading conditions, and develop the corresponding simulation system in the phase of product development. On the basis of former achievement, deep-water floating wind turbine structure dynamics model was constructed. This model is mainly composed by three parts, a wind turbine aerodynamics module, a floating offshore platform hydrodynamic module and a structural dynamics module. The core simulation algorithm is a dynamic substructure method, which puts the hydrodynamic load and aerodynamic load into the interface of structure dynamics module. It implements the solving of the structural dynamic equation under the aerodynamic and hydrodynamic coupling conditions. In order to test the feasibility of the simulation model, this model was used for the whole dynamics simulation analysis of NREL benchmark 5MW floating wind turbine. The results show that the simulation model can solve the problem of structural dynamics in aerodynamic and hydrodynamic in coupling condition. At the same time, the results indicate that floating platform of deep floating wind turbine will generate the corresponding motions under the wind and wave loading conditions, which has a significant impact of structures response and the power fluctuations under aerodynamic and hydrodynamic coupling load.