关键词: 覆冰舞动, 找形分析, 有限元, 等效加载, 气动荷载, 位移响应

Abstract: Aiming at the problem that traditional fluid-structure interaction methods are difficult to quickly obtain the galloping response of transmission lines under icing conditions in scenarios such as daily operation and maintenance monitoring and engineering emergency assessment, a finite element-based equivalent loading method for icing galloping loads is proposed, which aims to improve the efficiency of galloping response prediction to meet engineering emergency needs. The catenary theory is used for conductor shape-finding analysis to determine the initial equilibrium state of the conductor under the action of initial tension and self-weight. Based on the three-component aerodynamic force principle, combined with the lift coefficient, drag coefficient and torque coefficient of the iced conductor, the lift force, drag force and torque are calculated. The dynamic aerodynamic loads are equivalently converted into concentrated nodal loads based on the finite element model. Finally, the simulation analysis of galloping displacement response is realized with the help of the ANSYS APDL platform. The example results verify the applicability of the method to single conductors, split conductors and different icing shapes, and it can also be applied to galloping analysis under low wind speed conditions. Compared with the traditional method, this method does not require complex parameter input and long-time integral iteration, and can quickly output the conductor displacement response results, with a significant improvement in analysis efficiency, which can provide technical support for the formulation of anti-galloping decisions for transmission lines under icing disasters.

Key words: icing galloping, shape-finding analysis, finite element, equivalent loading, aerodynamic load, displacement response