考虑桨叶旋转效应的海上风力发电高塔系统随机风振响应与动力可靠度分析

研究了考虑桨叶旋转效应的海上风力发电高塔系统随机动力响应与风振可靠度分析.在风场模拟中,桨叶风荷载需要考虑旋转效应的影响.因此,对塔体风荷载,直接采用基于物理机制的随机Fourier谱,而对桨叶风荷载,则采用考虑桨叶旋转机制的随机Fourier谱概念.在此基础上,结合概率密度演化理论,对海上风力发电高塔系统进行了随机动力响应分析以及基于塔顶位移响应的风振动力可靠度分析.结果表明,上述方法能够有效地进行此类结构的随机动力响应及可靠度分析.

Stochastic Wind-Induced Response and Reliability Analysis of Offshore Wind Turbine Tower Systems Considering Rotational Effect of Blades

Stochastic dynamic response and reliability analysis of offshore wind turbine tower systems under wind loads are conducted.The concept of rotational random Fourier spectrum base on the blades’ rotational mechanism is employed and the random Fourier spectrum is taken as the source spectrum to simulate the wind loads on the blades and the offshore wind turbine tower,respectively.Then,the stochastic dynamic response analysis and reliability evaluation in terms of the tower tip drift are evaluated by incorporating the wind field model into the probability density evolution method.The results show that the proposed approach is feasible for the stochastic dynamic and reliability analysis of offshore wind turbine tower systems.