电视塔的风致振动控制研究

风灾是电视塔面临的主要自然灾害之一，主动控制方法可以有效地减小电视塔的风致振动。以一座空间钢管桁架电视塔为算例，首先基于ＡＮＳＹＳ软件分析了该电视塔的动力特性，然后利用谐波合成法模拟了其随机风场，同时，还提出了一种形状记忆合金的主动控制方法，并编制了相应的线性二次型经典最优控制算法（ＬＱＲ），最后对比了采取控制措施前后电视塔的风致响应，结果表明形状记忆合金控制方法可以有效地减少电视塔的风致振动。

Active control of Wind-induced Vibration of a Television Tower

Wind is one of natural disasters for television towers,and active control method could effectively mitigate the wind-induced vibration of the television tower.A television tower was taken as an example in this study,the dynamic characteristic of the television tower was firstly analyzed based on the ANSYS software.Subsequently,the stochastic wind field was simulated by the harmonic synthesis.Also,a shape memory alloy (SMA) control method was selected and the numerical simulation of a classical linear optimum LQR control algorithm was established.Finally,the control effects of wind-induced responses of the tower structure with and without the SMA control method were compared.The results shows that the control method can effectively reduce the wind-induced vibration of tower structures.