基于磁流变阻尼器的大跨越输电塔线体系风致振动控制

WIND-INDUCED RESPONSE MITIGATION OF TRANSMISSION TOWER-LINE SYSTEM BY USING MAGNETORHEOLOGICAL DAMPERS

研究了输电塔线体系基于磁流变(MR)阻尼器的风致振动控制问题。采用多自由度模型建立了输电导线的动力分析模型。针对输电塔线体系的平面内振动和平面外振动分别建立了塔线耦联体系的受控运动方程。并提出一种固定增量半主动控制策略。数值分析表明,MR阻尼器可有效地抑制输电塔结构的风振反应。通过合理地选取MR阻尼器及可控MR流体的参数,可以获得最佳的减振效果。

The MDOF model of transmission line is developed. The dynamic model and analytical method for analyzing transmission tower-line system incorporated with MR dampers are provided for in-plane/out-of-plane vibration. A semi-active control strategy based on constant increment of controllable damper force is proposed for MR damper. The performance of MR damper for wind-induced vibration mitigation is numerically examined through an actual transmission tower-line system constructed in southern China. The nunerical investigation demonstrates that the wind-induced vibration of transmission tower-line system can be substantially suppressed by using MR dampers if the damper parameters are optimally determined.