多模态耦合的覆冰导线风致舞动分析  

Analyses of wind-induced galloping of iced-conductor jointly with multi-modal coupling

作　　者：张会然 杨雄骏 刘中华[1] ZHANG Huiran;YANG Xiongjun;LIU Zhonghua(School of Architecture and Civil Eegineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学建筑与土木工程学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2022年第4期540-547,共8页Journal of Xiamen University：Natural Science

基　　金：国家重点研发计划(2017YFC0803300);国家自然科学基金(11772277)。

摘　　要：深入研究覆冰导线在风致作用下发生的舞动具有重要意义.覆冰输电导线是一个三维连续体,存在面内-面外-扭转多阶模态耦合,因此详细分析覆冰导线发生舞动时各阶模态在耦合作用下的舞动特性是有必要的.本文提出覆冰导线面内-面外-扭转多阶模态耦合的非线性动力分析模型,通过Lyapunov理论对覆冰导线稳定性进行判断,分析了在稳定风场中不同风速下,覆冰导线各阶模态舞动情况.进一步考虑了覆冰导线所在风场的随机性,为提高脉动风场的模拟效率,采用基于Hermite插值改进Cholesky分解的脉动风场模拟方法,分析脉动风下覆冰导线各阶模态舞动特性,并与稳定风场中覆冰导线各阶模态的振动进行比较.It is of great significance to study iced-conductor galloping under wind loads profoundly.Considering that the iced-conductor is a three-dimensional continuum and the in-out-torsion multi-order modal coupling is involved,we feel urgent to analyze galloping characteristics of each mode.In this study,a nonlinear dynamic-analysis model for the in-out-torsion multi-modes of the iced-conductor is proposed.The stability of the iced-conductor is determined by Lyapunov theory,and each modal galloping of the iced conductor under various wind speeds in a steady wind field is analyzed.For the purpose of improving the simulation efficiency of the fluctuating wind field,a simulation method based on Hermite interpolation to improve Cholesky decomposition is used.Finally,modal galloping characteristics of the iced-conductor under the stochastic wind field are analyzed and compared with those in a steady wind field.

关 键 词：覆冰导线舞动 模态耦合 稳定性分析 随机风场 

分 类 号：TB122[理学—工程力学]