横风向涡振（VIV）是诱发柔塔结构疲劳损伤甚至结构破坏的主要原因之一。目前风力机设计中已采用工程方法考虑了涡振对柔塔的影响，但现有研究对叶片尾流干涉下的柔塔涡振机理及控制方法研究不足。申请人前期对亚临界柱体结构涡振控制分析及多体系统动力学建模已有较多经验积累。鉴于此，本项目拟以叶片-柔塔多体耦合结构为研究对象，同时考虑结构场上叶片-柔塔的多体耦合以及流场上尾流对柔塔的绕流干涉，基于多体系统传递矩阵法（MSTMM）、计算流体力学（CFD）、结构动力学方法，引入具有宽频吸振特性的非线性能量阱（NES）被动控制模型，建立叶片-柔塔-NES耦合结构的涡振控制模型并结合风洞实验，探索叶片不同停机位置和角度情况下的柔塔过临界涡振特征及NES的减振效果。本项目的研究预期将阐明柔塔涡振模态激发机理和形成机制，揭示NES对柔塔涡振的宽频减振机理，为柔塔结构减振延寿提供新思路，具有重要科学意义和工程应用前景。

Cross-wind vortex induced vibration is one of the main causes of fatigue damage and even structural damage of flexible tower structures. At present, the engineering methods have been adopted in the design of wind turbines to consider the influence of vortex induced vibration on the flexible tower. However, there is a lack of in-depth study on the vortex-induced vibration mechanism and control method of the flexible tower structures under the interference of blade wakes. In the early stage, the applicant has accumulated a lot of experience in vortex-induced vibration analysis of cylinder structures and dynamics modeling of multi-body system. In view of this, this project intends to take the blade-flexible tower multi-body coupling structure as the research object. At the same time, the multi-body coupling between the blade and the flexible tower in the structural field and the interference of the wake on the flexible tower in the flow field are considered. Based on transfer matrix method for multi-body system (MSTMM), computational fluid dynamics (CFD) and structural dynamics method, the passive control model of nonlinear energy sink (NES) with broadband vibration absorption characteristics is introduced, and the control model of vortex induced vibration of blade-flexible tower-NES coupling structures and wind tunnel test platform are established to explore the vortex induced vibration characteristics of the flexible tower and the suppression effect of the NES under different blade stop positions and angles in overcritical areas. The research of this project is expected to clarify the excitation and formation mechanism of vortex-induced vibration modes of the flexible tower, reveal the wide-band suppression mechanism of NES and provide a new idea for the vibration reduction and extending the life of flexible tower structures, which has important scientific significance and engineering application prospects.