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分裂式覆冰导线横风弛振响应研究

期刊名称：振动工程学报，03期，2008.(EI收录)
时间：0
分类：TU352.2[建筑科学—结构工程] TU852
作者机构：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024, [2]中铁九局集团有限公司,辽宁沈阳110013
相关基金：国家自然科学基金重点项目（50638010）;教育部创新团队（IRT0518）和高等学校博士点基金（20060141027）资助
相关项目：高压输电塔-线体系抗震抗风基础研究

关键词：分裂式导线, 有限元模型, 驰振模拟, 均匀流场, 湍流场, the bundled conductors, finite element model, galloping simulation, uniform flows, turbulence flows

中文摘要：

针对导线分裂布置的输电线路覆冰弛振原因、影响条件及响应参数，采用3自由度有限元模型建立分裂导线弛振分析方法。模型包括弛振作用的竖向、水平和扭转分量，非线性气动荷载，非规则导线覆冰几何外形。忽略导线同子跨运动，将分裂导线模拟成等效的参考曲线。分析基于四分裂导线，采用考虑大位移的3自由度有限元法。结果表明，导线的动力特性是能否发生弛振以及振动强度的决定性因素；在均匀流场中，驰振的发生受风初始攻角、初始覆冰角度和风速等参数的共同影响和限制，并伴随扭转振动，振动迹线主要为竖向或水平向椭圆I在湍流场中驰振的主频率分量受湍流密度的控制并有放大作用，驰振随湍流强度的增加而线性增加，与频率分量无关。

英文摘要：

Considering the induced reasons, occurrence conditions and response parameters of iced-bundle conductors of transmission line, the analytical method with three degrees finite element model for iced-bundle conductors galloping has been established. The model accommodates interactions of the vertical, horizontal and torsional movements, nonlinear aerodynamic loads, non-uniform ice geometry. By neglecting the subspan motions between the conductors, a bundle is modeled as an equivalent reference curve. Based on the four-bundle transmission line, the finite element method with three degrees under large displacement condition is used. The results indicates that： the dynamic properties of conductors are determinising factors related to occurrence and intensity of galloping. In uniform flows, the occurrence of galloping is affected and restricted by the parameters of initial attack angle, initial iced-incline angle and wind speed, and along with torsional vibration. The dominating vibration trace is commonly exhibited as vertical or horizontal ellipse. The master frequency components of galloping in turbulent flows are amplified and dominated by the turbulent intensity. Vibration frequency components unrelated to galloping increased linearly with rise in turbulence intensity.

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