支持式管母线风致振动数值仿真分析

Numerical Analysis of Wind Induced Vibration of Supporting Type Tubular Busbars

支持式管母线在野外长期服役期间经常遇到风致振动的问题。本文采用数值模拟方法,对支持式管母线抗强风振动特性及阻尼对振动的影响进行了分析。计算了管母线简化模型的固有频率和振型以及受到风荷载作用时的变形特征,采用静态算法和动态算法对比分析了阻尼线对管母线抗风振动所起到的作用。进而对支持式管母线全尺寸结构在风荷载作用下的动态特性进行了计算,分析了阻尼线及管母线结构阻尼对抗风振动的影响。结果表明,理想条件下,阻尼线能有效减小受风载后管母线简化模型的振动变形,但在真实全尺寸管母线结构中,由结构连接等形成的结构阻尼比阻尼线对管母线抗风振动的效果更为显著,有无阻尼线对真实结构振动特性不产生明显区别。

Supporting type tubular busbars often encounter wind-induced vibration problems during long-term service in the field.Numerical simulation methods are used to analyze the wind vibration characteristics of the supported tubular busbar and the influence of damping on vibration.The natural frequency and mode shape of the busbar under ideal conditions and the deformation characteristics when subjected to wind load are calculated.The static algorithm and the dynamic algorithm are respectively used analyze the effect of the damping line on the wind resistance of the busbar.Furthermore,the dynamic characteristics of the full-scale supported tubular busbar structure under wind load are calculated,and the influence of the damping line and the busbar structural damping against wind vibration is analyzed.The results show that in an ideal state,the damping line can effectively reduce the deformation of the busbar after wind load.However,in the real full-size tubular bus structure,the structural damping formed by structural connections is more significant than the effect of the damping wire on the wind vibration of the busbar.