考虑土-结构相互作用的风力发电高塔振动控制研究

Research on vibration control of wind turbines considering soil-structure interaction

研究了考虑土-结构相互作用(SSI)的风力发电高塔振动控制问题。通过理论推导,得到了安装有圆球减振装置(BVA)的风力发电高塔位移传递函数,其中,特别考虑了基础与地基之间的相对位移及转角。运用经典随机振动理论,计算得到了结构无控及有控响应的均方根值。结果表明,SSI对风力发电高塔系统的动力特性具有显著影响。考虑SSI后,体系第一阶频率降低,传递函数峰值增加。当地基土剪切刚度较小时,SSI将降低调谐至嵌固结构基频的减振装置的减振效率。因此,在对软土基地上的风力发电高塔进行振动控制分析与设计时,应充分考虑SSI的影响。

This paper presents a systematic study on vibration control of wind turbines considering soil-structure in- teraction （SSI）. The transfer function of the wind turbine attached with a ball vibration absorber （BVA） is derived including the foundation translation and rotation relative to the soil medium. Based on the classical random vibration theory, the r. m. s values of responses of the structure with and without control are simulated. The results show that SSI has significant effect on the dynamic properties of the wind turbine tower system. The first natural frequency of the system is reduced and the peak value of the transfer function is increased due to SSI. For the soft soil, the SSI will lower the effectiveness of the BVA, when it is tuned to the natural frequency of the fixed-base structure. There- fore, it is included that in the analysis and design of vibration control of wind turbines, the effect of SSI should be taken into consideration.