风力发电机组塔架的仿竹结构设计

针对风力发电机组塔架高耸结构稳定性问题,结合仿生结构设计理论,将竹子纤维束引入塔架结构,研究通过仿竹结构设计提高塔架稳定性的方法.以2 MW风力发电机组塔架为研究对象,采用层次分析法对竹子与塔架的相似度进行计算,验证生物选型的合理性.通过研究竹子纤维束特征与竹身稳定性的关系,设计出具有4根加劲肋的仿竹塔架.应用有限元数值分析方法对仿竹塔架和原型塔架的静态和动态效能进行分析,结果表明:仿竹塔架的塔顶位移和最大应力相较原型塔架分别降低了2.27%和13.48%,仿竹塔架前两阶固有频率相较原型塔架提升了1.31%和1.58%,仿竹塔架结构整体稳定性提升了1.4%.验证2 MW风力发电机组塔架仿竹设计的可行性可为后续塔架结构设计提供新的方法.

Bionics design of wind turbine tower based on bamboo structure

To address the stability problem of the towering structure of wind turbine tower, the bamboo vascular bundles were introduced into the tower structure according to the bionic structure design theory. The method of improving the stability of the tower is studied through the design of a bamboo structure. Taking the 2 MW wind turbine tower as theobject of study, the Analytic Hierarchy Procedure (AHP) is applied to calculate the similarity between the bamboo and the tower to verify the rationality of the biological selection. By studying the relationship between the characteristics of bamboo vascular bundles and the stability of the bamboo, a bionic bamboo tower with four stiffening ribs was designed. Finite element analysis is employed to comparatively investigate the performance of the bionic bamboo tower and the original tower in the static and dynamic. Through the investigation, it is suggested that the maximum deformation and maximum stress can be reduced by 2.27% and 13.48% of the bionic bamboo tower, respectively. This approach results in 1.31% and 1.58% increase respectively in the first and second natural frequencies. Moreover, the overall stability of the bionic bamboo tower structure is improved by 1.4%. The feasibility of the bionic design of 2MW wind turbine towers is verified here, and a new method for the design of subsequent tower structures is provided.