覆冰输电导线流固耦合风致振动多软件协同数值解耦计算方法研究

Decoupling numerical method for fluid-structure coupling wind-induced vibration of ice-covered transmission wire with multiple softwares

输电导线高度不断增加,跨度增大,覆冰导线其横截面不对称,这些因素都造成了导线在风场作用下形成升力和扭矩,进而使得导线振动幅度显著增大;与此同时,由于导线具有柔性性质使导线产生的大变形会对来流风场造成显著影响,而风场的变化又会导致风荷载的变化,从而风与其所引起的结构运动之间就形成了流固耦合作用。本文基于输电导线气动力拟合函数,提出了一种协同运用ANSYS与MATLAB软件,进行冰风载荷下输电线路塔线体系流固耦合振动的并行解耦数值计算方法,用于对冰风环境下的输电塔线结构进行动力学时程分析。数值分析显示考虑流固耦合因素的影响时导线最大位移更大,在输电塔线结构的安全性能分析中必须加以考虑。

The height and span of the transmission wire increase, the cross-section of the ice-covered wire is asymmetrical. These factors cause the wire to form the lift and the torque under the action of the wind, and the wire amplitude is greatly increased. At the same time, the flexibility of the wire leads to a large deformation that can have significant effects on the flow field. The change of the wind will lead to the change of the wind load, and then the fluid and the structural movement caused by it form a fluid-solid coupling. This paper presents a new parallel decoupling method for analyzing the fluid-solid coupling vibration of the tower-coupled system under the ice and wind load by ANSYS and MATLAB. Based on the aerodynamic function of the transmission wire, the problem of cross-scale meshing is solved. This method is used in dynamic time history analysis of the tower-coupled system in the ice wind environment. The numerical analysis evaluates the safety performance of the tower-coupled structure under ice wind environment, and points out that when considering the influence of fluid-solid coupling factors, the maximum displacement of the wire is greater and must be considered in the analysis.