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根据SMA阻尼器的工作原理和输电塔的振动特性,提出应用SMA阻尼器对输电塔风致振动进行控制。应用有限元软件建立输电塔和阻尼器的有限元模型,基于Matlab软件,采用线性自回归滤波器法模拟随机脉动风荷载的时程样本;应用能量法计算所需阻尼器数量,根据阻尼器的工作原理和输电塔结构特点设计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。模拟了多种风荷载,进一步对各方案的控制效果进行了对比分析。结果表明:SMA阻尼器对输电塔风振控制效果较好;将阻尼器布置在塔头上,可有效控制塔顶位移,减振率在28%以上;在塔身上布置阻尼器,可有效控制塔顶加速度,减振率在66%以上。通过综合比较,选出了阻尼器的最佳布置方案。
According to the working principle of SMA damper and the vibration characteristics of transmission tower, the application of SMA damper is proposed to control the wind induced vibration of transmission tower. The finite element model of transmission towers and dampers is established by using finite element software. Based on the Matlab software, the time-history samples of stochastic fluctuating wind loads are simulated by linear autoregressive filter method. The required damper quantity is calculated by energy method, Working principle and structure characteristics of power transmission tower, different dampers layout schemes are designed. The wind-induced vibration transient response simulation of different schemes is carried out, and the displacement and acceleration time history of each scheme control points are extracted for comparative analysis. Simulation of a variety of wind loads, the control effect of each program were further analyzed. The results show that the SMA damper has a good wind-induced vibration control effect. The damper is placed on the top of the tower, which can effectively control the displacement of the tower with the damping rate of over 28%. Dampers can be effectively controlled Top acceleration, damping rate of 66% or more. Through comprehensive comparison, the best arrangement of damper is selected.