极端海况下海上漂浮式风力机张力腿平台动力分析

Dynamics analysis of tension leg platform for floating wind turbine under extreme sea condition

根据NREL5MW风力机设计参数,建立整机及其张力腿平台三维模型,针对平台动力特性,采用有限元方法,利用ANSYS有限元软件和开源程序软件FAST,基于Block Lanczos算法和Von-Mises失效理论,考虑平台结构阻尼和惯性载荷,分别研究了平台振动特性和极端海况下平台结构应力。结果表明:不同的风波流载荷方向对平台强度影响极大;最大等效应力发生在平台底部圆板边缘即为平台危险区域;风轮转动和波浪运动均不会引起平台发生共振响应。

According to the design parameter of NREL 5MW wind turbine,the paper built 3D model of wind turbine and TLP .Based on the algorithm of Block Lanczos and the failure theory of Von -Mises,it used finite element method , ANSYS finite element software and open source software of FAST to study the vibration performance and structure stress of platform under the extreme sea condition by considering the structure damping and inertial load aim at platform dynamic property .The results show that different di-rections of wind , wave and current load have enormous influence on the strength of platform; the maxi-mum equivalent stress occurs in the margin of bottom plate which is the platform dangerous area; the blade rotation and wave motion can't cause the resonance response of platform .