基于双自由度受迫振动的输电线路防舞装置研究

Research on anti-galloping device of transmission line based on two-degree-of-freedom forced vibration

线路舞动给输电线路安全运行带来极大危害。传统的抑扭环在防止线路舞动方面有一定的效果,但在线路开始舞动后,装置的防舞性能将会大幅降低。为此,基于弹簧吸振原理,采用双自由度受迫振动系统,进行线路防舞装置研究以提高抑扭环在线路发生舞动后的防舞性能。当线路开始产生舞动时,导线系统为主振动系统,圆环部分为副振动系统,通过调节吸振弹簧的刚度和圆环质量可以使抑扭环在线路舞动时具有一定的吸振作用。首先建立了导线—装置系统简化模型,然后对模型施加一定频率的激励力,对比分析了装置改进前后线路舞动竖向位移和轴向应力的峰—峰值。仿真计算表明,该防舞装置能够减小线路舞动竖向位移和轴向应力的峰—峰值,对舞动有明显的抑制作用。

Transmission line galloping brings great harm to the safe operation of transmission line. Traditional torsion suppression ring has a certain effect on preventing transmission line galloping. However, when the transmission line begins to gallop, the anti-galloping performance of the device will be greatly reduced. Therefore, an anti-galloping device of transmission lines was researched based on the principle of spring vibration absorption, using a two-degree-of-freedom forced vibration system to improve the anti-galloping performance of the torsion suppression ring during the galloping. When the transmission line begins to dance, the conductor system is the main vibration system, while the ring part of the torsion suppression ring is the secondary vibration system. By adjusting the stiffness of the vibration-absorbing spring and the mass of the ring, the torsion suppression ring can have a certain vibration-absorbing effect when the transmission line is galloping. Firstly, a simplified model of conductor and device system was established and then, the excitation force of a certain frequency was applied to the model and the peak-to-peak amplitude of the conductor vertical displacement and axial stress before and after the improvement of the device were compared and analyzed. The simulation results show that the anti-galloping device can reduce the peak-to-peak amplitude of the conductor vertical displacement and axial stress, and has a significant inhibitory effect on galloping as well.