不同波浪理论下风机支撑系统的动力响应

摘要

Focusing on the dynamic response of offshore wind turbines,a numerical model of a wind turbine system is established based on revised small-amplitude wave theory,Airy wave theory,and Stokes five-order wave theory. By importing the P-y curve and simulating the application of wave,tidal current,and wind load, the dynamic re-sponses of a wind turbine supporting system are obtained under different wave theories.It is shown that the maxi-mum horizontal displacements,rotation angles,and bending moments of the support system are different with differ-ent wave theories,but the vibration modes and natural frequencies are basically the same.In the following order, the theories have the most to least significant effect on the entire support system: Stokes five-order wave theory, Airy wave theory,and revised small-amplitude wave theory.Results show that to provide basic data for both the bearing and fatigue designs of a wind turbine,it is necessary to select an appropriate wave theory to analyze the dy-namic response of the wind turbine under the action of wind,wave,and current.%针对海上风机动力响应问题,依据修正的小振幅波理论、Airy波理论以及Stokes五阶波浪理论,建立了风机系统模型,输入P-y曲线,并模拟施加波浪、潮流荷载、风荷载等,得到了不同波浪理论下风机支撑系统的动力响应.结果表明,不同波浪理论下支撑系统最大水平位移、转角和弯矩均存在一定差异,振型和自振频率基本一致, Stokes五阶波浪对整个支撑系统的影响最显著,其次是Airy波和经修正的小振幅波.在风机设计时必须选择合适的波浪理论,分析风机在风浪流作用下的动力响应,为风机承载设计和疲劳设计提供基础资料.