浮式风力机平台摇荡运动混沌分析及预测  

Chaos Analysis and Prediction of Floating Wind Turbine Platform's Rolling Motion

作　　者：余万[1] 李春[1] 丁勤卫 郝文星[1] 周红杰[1] 袁全勇 YU Wan;LI Chun;DING Qin-Wei;HAO Wen-Xing;ZHOU Hong-Jie;YUAN Quan-Yong(University of Shanghai for Science and Technology, School of Energy and Power Engineering, Shanghai 200093, China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《工程热物理学报》2019年第5期1050-1057,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51676131; No.51176129)

摘　　要：为探究漂浮式风力机平台在多种非规则环境载荷作用下摇荡运动中的非线性动力学特征,建立基于OC3 Spar平台的NREL 5 MW风力机整机模型,采用水动力软件AQWA求解平台的摇荡运动,基于相空间重构及最大李亚普诺夫指数法从定性及定量角度判断平台在风、浪、流载荷作用下摇荡运动时间序列的混沌特征,且进一步采用加权零阶局域法预测平台运动.结果表明:在低频时Spar平台幅值运动响应算子较大;在多重载荷作用时平台在平衡位置处做摇荡运动;平台在纵荡、垂荡及纵摇方向上的运动时间序列具有混沌特征,且三个方向短期可预测时间最大为0.4879 s;预测数据时间超过短期可预测时间时,随着时间增大预测数据和实际数据的绝对误差增大.混沌理论是非线性动力学的重要研究方向,可作为漂浮式风力机平台非线性运动分析的一种新方法.The nonlinear dynamic characteristics of the floating wind turbine platforms are analyzed in this paper under a variety of non-regular environmental loads. The whole model of NREL 5 MW wind turbine is established based on OC3 Spar platform. The software AQWA is used to solve the platform’s rolling motion. Based on Phase-space reconstruction and the maximum Lyapunov exponent method,the chaotic characteristics of the platform’s rolling motion time series are judged under wind, wave and current loadings qualitatively and quantitatively. And the platform motion is further predicted by the weighted zero-order local-region method. The results are as follows: the response amplitude operator of Spar platform is large at low frequencies;the platform performs rolling motion at the equilibrium position under multiple loads;the time series of the platform possess chaotic characteristic in the directions of surge, heave and pitch and the short-term predictable time is 0.4879 s;when the forecast data time exceeds the short-term forecast time, the absolute error of the forecast data relative to the actual data increases with time elapsed. Chaos theory is an important research direction of nonlinear dynamics and can be as a new method for nonlinear motion analysis of floating wind turbine platforms.

关 键 词：漂浮式风力机 SPAR平台 相空间重构 最大李亚普诺夫指数 加权零阶局域法 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程]