摘要
海上浮式风机为深海风能开发提供了有效的解决方案,风浪载荷下风力机将产生大幅运动,系泊缆索往往处于松弛-张紧交替状态,过大的动张力将引起缆索疲劳断裂而导致风力机倾覆而损毁。考虑气动和波浪载荷作用,建立系泊缆索张紧、松弛状态下的风力机运动学方程,缆索的松弛-张紧区域根据阻尼比、频率比和位移比确定。以美国可再生能源实验室(NREL)5MW海上半潜式风力机为研究对象,分析了不同工况下风力机的运动响应及缆索的动张力变化规律,阐明了系泊缆索施加的预张紧力对其动张力的影响,这将为海上浮式风机系泊系统设计提供理论依据。
Offshore floating wind turbine provides an effective solution for the development of deep sea wind energy. Under wind and wave loads, the wind turbine will produce a substantial movement and the mooring lines will always in a slack-taut state,excessive dynamic tension will cause the cable fatigue fracture and lead to the failure of the wind turbine. Considered the aerodynamic and hydraulic loads under the ocean condition, the motion equations of the wind turbine were established under the condition of the tension and relaxation of the mooring line under the condition of the slack-taut state of the mooring line. The slack-taut state of the line was determined by the damping ratio, the frequency ratio and the displacement ratio. Taken the NREL 5MW offshore floating wind turbine as an example, the motion responses of the wind turbine under different conditions were analyzed, and the influence of the pretension on the dynamic tension of the mooring line was investigated. The results can provide theoretical bases for the design of the mooring system of the offshore floating wind turbine.
出处
《机械设计》
CSCD
北大核心
2017年第10期56-60,共5页
Journal of Machine Design
基金
国家自然科学基金资助项目(11572125
51205124)
湖南省教育厅优秀青年资助项目(16B093)
湖南省自然科学基金资助项目(2016JJ4033)
关键词
海上浮式风机
系泊缆索
松弛-张紧
动张力
预张力
offshore floating wind turbine
mooring line
slack-taut
dynamic tension force
pretension
