风波流多环境海上漂浮式风力机张力腿平台动态特性

平台结构是漂浮式海上风力机安全运行的基础保障。采用边界元并结合多体动力学方法,分析了张力腿（Tension Leg Platform,TLP）漂浮式风力机平台结构,研究了平台结构在频域和时域运动响应变化及漂浮式平台在多种不同海洋环境条件下风、波、流联合作用,与波浪载荷独立作用时的运动响应进行了比较,得出平台结构在时域中的动力响应及张力腿结构张力变化情况。结果表明：漂浮式平台在频域变化范围内,运动响应主要集中在低频部分,绕射力对漂浮式海上风力机TLP平台的作用力不能忽略;海洋环境载荷较小时,风、波、流联合作用比只有波浪运动响应强烈,而随着海洋环境载荷增强,波浪作用越来越大,对漂浮式平台运动有着重要影响;风、波、流联合作用运动响应标准差大于只有波浪作用,平台偏离平衡位置更加剧烈;张力腿最大张力随着海洋环境载荷增强逐渐增大,每根张力腿张力标准差都是以相同的趋势递增。研究结果对海上张力腿平台结构设计与优化具有很高的参考价值。

Dynamic characteristics of wind turbine tension leg platform for multi-environment of wind wave current above sea

Platform structure is the basic guarantee for safety operation of offshore wind turbine. Based on the finite element method and combined with multi- body dynamics,the paper analyzed the platform structure of offshore wind turbine of tension leg platform,and analyzed the combined action of wind and wave current of tension leg platform in different sea states in the motion response of frequency domain and time domain. Through the comparison of motion response in only role of wave load,it obtained the situation of tension change of TLP in time domain. The results show that the motion response of TLP in frequency domain focuses on low frequency,the effect of diffraction force on offshore wind turbine tension leg platform is not ignored; when ocean environment load is small,response in combined wind and wave current is greater than that in only wave; but along with the increase of environment load,the role of wave force is greater; the maximum tension of TLP increases with the increase of ocean environment load, and the standard deviation of tensile force every TLP also increases with the same trend. The result has high reference value for design and optimization of offshore tension leg platform structural.