基于运动追踪方法的引下线风致振动研究
Research on wind-induced vibration of down lead transmission lines based on motion tracking method
游溢 1陈东娃 1魏晌 1路永辉2
作者信息
- 1. 国网新疆电力有限公司电力科学研究院,乌鲁木齐 830011
- 2. 国网新疆电力有限公司超高压分公司,乌鲁木齐 830011
- 折叠
摘要
变电站引下线受到风荷载作用时会引起明显的风致振动.引下线的振动不但会使自身发生破坏,同时也会造成连接金具的破坏,甚至导致整个系统出现故障.基于运动追踪方法,在风洞试验中获取了典型变电站引下线模型在风荷载作用下的运动状态图像,并通过图像中多个特征点的位移时程完成了动力参数识别.采用随机子空间法识别的结构一阶频率在 4Hz左右,阻尼比离散性较大,其范围在 0.002 5～0.03,均属于小阻尼.研究表明,基于图像识别的运动追踪方法能够识别引下线结构的风致大变形,并能获取结构动力信息.
Abstract
Down lead transmission lines in substations experience significant wind-induced vibrations when subjected to wind loads.The vibration of the down lead transmission lines can not only cause damage to themselves but also to the link fittings,potentially leading to failures in the entire system.Utilizing motion tracking method,images depicting the motion states of a typical substation down lead transmission lines model under wind load were obtained in wind tunnel tests.Dynamic parameter identification was completed through the displacement time history of multiple feature points in the images.The first-order frequency of the structure,identified using the random subspace method,is around 4Hz,with a wide range of damping ratios from 0.002 5 to 0.03,all indicating low damping.Research show that motion tracking methods based on image recognition can identify wind-induced large deformations of down lead transmission structures and can obtain structural dynamics information.
关键词
变电站引下线/风致振动/运动追踪方法/风洞试验Key words
down lead transmission lines in substation/wind-induced vibration/motion tracking method/wind tunnel test引用本文复制引用
基金项目
国家电网新疆电力有限公司科技项目(5230DK20004J)
出版年
2024
NETL
NSTL
万方数据