环境与结构因素对输电线舞动的影响

Influence of environmental and structural factors on transmission line galloping

为了确定环境与结构因素对输电线舞动的影响,将输电线舞动的流固耦合问题简化为在气动力作用下的瞬态动力学问题.首先,根据悬索链理论进行静态找型,确定输电线的初始状态,并利用Hartog Den的垂直舞动机理和O.Nigol的扭振机理确定输电线所受到的气动力.其次,应用ANSYS的APDL语言编写有限元批处理程序,建立了两自由度输电线舞动的有限元模型,并依据已有的数据对此模型进行校验.最后,应用所建立的模型分析了风速、空气密度、阻尼比以及初始张力等参数对输电线舞动的影响.结果表明,舞动振幅随风速与空气密度的增大而增大,随阻尼比以及初始张力的增大而减小.

To ascertain the influence of environmental and structural factors on the transmission line galloping,the transmission line dancing fluid-solid coupling problem was simplified to transient dynamics problem in aerodynamic effect. The suspension cable theory was used to determine the initial state of transmission line. The transmission line aerodynamic forces were confirmed by Den. Hartog＇s vertical galloping mechanism and O. Nigol＇ s torsional galloping mechanism. The finite element model（ FEM） of transmission line dancing with two degrees of freedom was established based on APDL languages of ANSYS FEM,and the existing data were verified by the proposed model. The influences of wind speed,air density,damping ratio and initial tension on power transmission line galloping were analyzed by the proposed model. The results show that the galloping amplitude is increased with the increasing of wind speed and air density,and galloping amplitude is decreased with the increasing of damping ratio and initial tension.