Effects of Second-Order Difference-Frequency Wave Forces on Floating Wind Turbine Under Survival Condition  

作　　者：Jiawen Li Yichen Jiang Yougang Tang Xiaoqi Qu Jiawei Zhai 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University [2]Department of Mechanical Engineering, University of California at Berkeley

出　　处：《Transactions of Tianjin University》2017年第2期130-137,共8页天津大学学报（英文版）

基　　金：supported by National Natural Science Foundation of China (No. 51479134);Fund for Creative Research Groups (No. 51321065)

摘　　要：In this paper, the effects of second-order difference-frequency wave forces on the global motion of an offshore wind turbine system with a large displacement under the survival condition are studied. In this case, the hydrodynamic force is the main force because the blades are feathered to reduce the lifting force. The first-order hydrodynamic forces are calculated by WADAM, while the second-order wave forces are calculated by a customized MATLAB module. Then the hydrodynamic coefficients are transferred to the wind turbine analytical code FAST. Through the comparisons of dynamic responses between the first- and second-order numerical models, it is found that the second-order wave forces significantly influence the motion of floating wind turbine under the survival condition. Moreover, neglecting the second-order force significantly underestimates the tension forces in the mooring lines. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.In this paper, the effects of second-order difference-frequency wave forces on the global motion of an offshore wind turbine system with a large displacement under the survival condition are studied. In this case, the hydrodynamic force is the main force because the blades are feathered to reduce the lifting force. The first-order hydrodynamic forces are calculated by WADAM, while the second-order wave forces are calculated by a customized MATLAB module. Then the hydrodynamic coefficients are transferred to the wind turbine analytical code FAST. Through the comparisons of dynamic responses between the first-and second-order numerical models, it is found that the second-order wave forces significantly influence the motion of floating wind turbine under the survival condition. Moreover, neglecting the second-order force significantly underestimates the tension forces in the mooring lines.

关 键 词：Fluid dynamics HYDRODYNAMICS Mooring cables Sailing vessels Wind turbines 

分 类 号：TM315[电气工程—电机]