基于形状记忆合金阻尼器的输电塔线体系风振控制

Research on wind-induced vibration control of transmission tower-line system based on SMA damper

建立了输电塔线耦联体系模型,对所建单塔及塔线耦联体系模型进行模态分析,验证了所建模型的准确性.对脉动风进行时程模拟,分段作用于塔线体系不同位置.根据阻尼器的工作原理和输电塔结构特点,设计了3种不同的阻尼器布置方案,对不同方案进行结构风致振动瞬态响应仿真,提取各方案控制点位移和加速度时间历程进行比较分析.结果表明:安装形状记忆合金(SMA)阻尼器对于输电塔风振有较好的控制效果,在3种布置方案中,将阻尼器交叉布置在塔身的中上部时具有最好的减振效果.合理设计阻尼器布置方案能使阻尼器发挥最大耗能功能,获得最好控制效果.

In this paper,a model of the transmission tower-line coupling system was established.The modal analysis of the single-tower and tower-line coupled system model was performed to verify the accuracy of the model.The time-history simulation of the pulsating wind was performed.According to the working principle of the dampers and structural characteristics of the transmission tower,three different damper arrangements were designed.The transient response simulation of the structural wind-induced vibration was performed for different schemes.The time courses of the displacement and acceleration of the control points of each scheme were extracted and compared.The results show that the installation of shape memory alloy(SMA)dampers has a good control effect on the wind vibration of the transmission tower.In the three arrangement schemes,the damper is arranged in the middle and upper part of the tower body with the best damping effect.A rational design of the damper arrangement enables the damper to exert its maximum energy consumption and achieve the best control effect.