基于粘弹性阻尼器输电线路的风振控制研究

摘要

针对高压输电线路的风致振动,研究了基于粘弹性阻尼耗能原理的振动控制策略与实施方法.首先,在分析粘弹性阻尼器的耗能原理与结构设计特点的基础上,提出了阻尼器在铁塔上的布置方案；其次,采用有限元软件ANSYS,建立了一个包括铁塔、绝缘子、导线和地线的耦合体系的梁一杆有限元模型;采用由谐波合成法得到的随机脉动风荷载的时程样本,对安装阻尼器前后的铁塔进行了结构风致振动瞬态响应仿真.最后,在铁塔上选择相应的控制节点和控制单元,比较阻尼器对各控制节点的位移时间历程、各控制单元内力时间历程的影响.分析表明:采用粘弹性阻尼器能够有效地抑制输电线路风振,控制节点的位移下降约90％；另一方面,通过多种安装方案的比较,优化了阻尼器的安装位置.%For wind-induced vibration of power transmission tower-line system, the vibration control strategy and implementation method is studied based on energy consumption principle of viscoelastic-damper. Firstly, the layout scheme of damper on tower was proposed based on analyzing the principle and structure of viscoelastic-damper, and the structure of damper. Then, an finite element model of the coupling system including tower, insulate chain, phase line and ground line was built by using ANSYS. A wind-induced vibration transient response simulation was performed respectively for the tower system with and without dampers by using the time history samples of random fluctuating wind load obtained with harmonic synthesis method. Finally, the influence of viscoelastic-dampers on the displacement of the controlled nodes and the axial force of the controlled elements was compared. The results indicate that the viscoelastic-damper can suppress the wind-induced vibration and can reduce the node displacement by about 90%. Through comparison, the optimal installation scheme of viscoelastic-damper is obtained.