考虑到台风海况浮式风力机半潜式平台风浪流载荷动态响应及系泊性能分析

Dynamic Response and Mooring Performance of a Semisubmersible Platform for Floating Wind Turbine Considering Typhoon Sea States

为研究浮式风力机半潜式平台的动态响应及系泊性能,建立了基于半潜式平台的NREL5 MW浮式风力机模型.结合有限元方法,并利用辐射和衍射理论,在考虑风、浪、流载荷的联合作用下,运用Aqwa软件对极端海况下半潜式平台的动态响应及系泊性能进行数值仿真,得到了幅值响应算子(RAO)、附加质量、辐射阻尼随波浪频率的变化趋势以及极端海况下半潜式平台的动态响应和系泊线的张力响应.结果表明:半潜式平台在高频区域(大于1.6rad/s)具有良好的运动性能,动态响应小;垂荡方向动态响应不受波浪方向变化的影响,且波浪方向为0°时,纵荡和纵摇动态响应最为剧烈;台风海况下半潜式平台的动态响应和系泊线的张力响应均大于无台风海况;随着海况恶劣程度加深,半潜式平台的动态响应和系泊线的张力响应均明显增大.

To research the dynamic response and mooring performance of a semi-submersible platform for floating wind turbine,a NREL 5 MW wind turbine model was established based on the semi-submersible platform,with which,numerical simulation was conducted on dynamic response and mooring performance of the platform under extreme sea conditions using Aqwa software by finite element method considering the combined action of random wave,wind and current load with the radiation/diffraction theory,thus obtaining the response amplitude operator（RAO）,the additional mass and the rate of radiation damping changing with the wave frequency,as well as the dynamic response of the platform and the tension response of the mooring line under extreme sea conditions.Results show that the platform would have good motion performance with little dynamic response,as the wave frequency is high（above 1.6 rad/s）;changes ofwave directions have little effect on the heave response;severest responses of surge and pitch would happen in the wave direction of 0 degree;under typhoon sea states,both the peak of dynamic response of platform and the peak of tension response amplitude are above those without typhoon;the dynamic response of platform and the tension response of mooring line increase with worsening sea states.