悬挂质量摆对大跨越输电塔的风振控制

Wind-induced vibration control of long span transmission tower with suspended mass pendulums

为了研究被动控制装置对格构式高耸结构的控制效果,提出了一种悬挂质量摆风洞试验模型.基于控制减振机理和结构风振控制方程,进行了悬挂质量摆对输电塔结构风振控制的全塔气动弹性模型试验.采用Simiu脉动风速功率谱密度函数,利用三角级数法模拟了节点风速时程.根据准定常理论,计算了悬挂质量摆控制前后结构顺风向的加速度时程和均方根(RMS),并进行了参数优化分析.研究结果表明,由模拟风载计算得到的塔顶RMS与试验结果吻合较好,该质量摆模型可有效减小输电塔的风振响应.

To research the effectiveness of passive control device on tower vibration control, a tunnel test model with suspended mass pendulums was proposed. Based on the mechanism and equation of wind vibration control, wind-induced vibration control for transmission tower model with suspended mass pendulums was performed by using a full aeroelastic model test. The time history of fluctuating wind velocities was simulated by using trigonometric series and adapting Simiu power spectrum. According to quasi-steady theory, the along-wind acceleration time history and root of mean square （RMS） with or without suspended mass pendulums control were calculated in the time domain, and the optimal design parameters of suspended mass pendulums were also determined. The results show that the acceleration RMS of tower tip obtained by simulated wind load agrees well with the experiment data, and the proposed model is very effective in mitigating tower vibration.