风力发电机组轮毂强度影响因素与结构优化研究

Study on Influencing Factors of Strength and Structural Optimization of Wind Turbine Hubs

轮毂的结构强度直接决定风力发电机组的整体结构安全性和风机载荷的顺利传递,且轮毂重量越轻发电效率越高。为了研究轮毂的强度影响因素和结构优化方向,以某2.5 MW风力发电机组的轮毂为研究对象,首先阐述轮毂的结构形式和受力特点,然后设计4种具有不同典型特征的轮毂结构方案并建立对应的有限元分析模型,最后总结各设计方案下轮毂的极限应力和疲劳损伤分布规律。所得出的轮毂强度特性和设计原则可以为轮毂的设计和结构优化提供借鉴。

The structural strength of the hub directly determines the overall structural safety of a wind turbine and the transmission of the wind turbine load,and the lighter the hubs are,the more efficient power generation can be.In order to study the influencing factors of strength and structural optimization of wind turbine hubs,the paper studies the hubs of a 2.5 MW wind turbine generating unit.First,it discusses the structural form and stress characteristics of the hub;then it designs four hub structure schemes with different typical characteristics and establishes a corresponding finite element analysis model;finally,the distribution laws of ultimate stress and fatigue damages of hubs in each of the design schemes are summarized.The strength characteristics and design principles of the hubs can provide a reference for design and structural optimization of the wind turbine hubs.