调谐滚球阻尼器在风力发电塔架中的振动控制研究

基于调谐质量阻尼器(TMD)原理,设计了适用于风力发电结构的滚球阻尼器,通过振动台模型试验,研究了该阻尼器的减振效果.试验表明,这种新型的滚球阻尼器的质量仅为一阶模态质量的1.5%～2.5%,可有效提高结构阻尼,在不同的工况下均具有较好的控制效果,可使试验模型的底部弯矩和塔顶位移的标准差减小20%～46%.这种阻尼器施工工艺相对简单,因此具有良好的经济性和实用价值,值得在实际工程中推广.

Vibration Ccontrol of Tuned Rolling-ball Damper in Wind Turbines

This study investigated the use of a kind of rolling balls tuned mass dampers as an effective method to reduce the wind induced vibration of wind turbines. The noval damper was characterized by single or multiple steel balls rolling in a spherical bowl and its mass was designed to be 1.5%~2.5% of the first modal mass. A 1/20 scaled experimental model was designed to investigate the performance of the damper through shaking table tests. The equivalent ground acceleration was input to obtain the equivalent dynamic response under different wind load cases. A series of forced vibration experiments were performed on the shaking table. The results indicate that the damper can effectively improve the damping capacity of the model. The standard deviations of the base moment and the top displacement were reduced by 20%~46%. The damper is very simple in the construction and has a good economic performance, so it is a feasible means to suppress the wind induced vibration of wind turbines.