近海风力发电高塔波浪动力可靠度分析  

OCEAN DYNAMIC RELIABILITY ANALYSIS OF OFFSHORE WIND TURBINE TOWERS

作　　者：徐亚洲[1] 李杰[2] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]同济大学土木工程学院,上海200092

出　　处：《工程力学》2013年第3期395-401,409,共8页Engineering Mechanics

基　　金：国家自然科学基金委创新研究群体项目(50621062);国家自然科学基金青年基金项目(51208410)

摘　　要：采用基于广义概率密度演化方程的极值概率密度理论,该文研究了近海风力发电高塔在随机波浪作用下的动力可靠度问题。波场由基于拟层流风波生成机制的随机Fourier海浪谱及线性波浪理论模拟,确定性结构动力响应由有限元模型分析给出。结果表明:采用极值概率密度理论可以方便地计算出不同阈值水平下塔顶侧移的动力可靠度,采用经典的Poisson模型计算的动力可靠度随阈值水平的降低而误差增大。The probability density theory of an extreme event based on the generalized probability density evolution equation is employed to investigate the dynamic reliability of an offshore wind turbine tower subjected to wave loads. The wave field is simulated by using the linear water wave theory and stochastic Fourier spectrum of ocean waves which originates from quasi-laminar wind-wave generation mechanism. Deterministic structural responses are analyzed by the finite element method. The results indicate that the dynamic reliability of the top drift for the offshore wind turbine tower under different thresholds can be evaluated reasonably by the probability density theory of equivalent extreme events. The result of dynamic reliability according to a Poisson model exhibits a worse accuracy as the threshold decreases.

关 键 词：动力可靠度 近海风力发电高塔 概率密度演化 随机Fourier海浪谱 MONTE Carlo抽样 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]