摘要
安装了失谐摆的大跨越分裂导线振动特性的准确计算对于舞动分析和防舞设计有重要意义。文中基于子导线总位移的控制微分方程,推导得到子导线段自由振动的控制微分方程。针对导线运动的小应变和小转角特点,提出了大跨越分裂导线的一种新型三维有限元模型,它可以直接处理间隔棒上安装了失谐摆的情况。结合间隔棒对导线的约束关系,推导建立了单元质量和刚度矩阵。应用获得的公式体系对实际大跨越分裂导线进行了自由振动计算, 注意到系统有丰富的侧向摆动模态。计算结果与实测结果的比较表明文中所用方法能有效应用于多档连续大跨越导线的动力特性的分析计算。
A new type of element which is suitable for solving the modes of the galloping long multi-span bundled conductor structures is presented. The element is composed of all sub-conductor segments between two spacers with detuning pendulum. Based on the linearized governing differential equations of the conductors, the mass matrix and stiffness matrix of the element in consideration of the constrained relations imposed on the conductors by spacers are derived. The dynamic characteristics of the galloping control devices can be directly added to the element. The modes for a realistic power line structure are computed by using the element formula and FEM procedures. It should be noted that there are abundant lateral vibration modes. Compared with the practical measured data, the results show that the method in this paper is reliable and effective. Analysis and discussions of the computational results are given. Some hints that are helpful to further investigation of galloping are also obtained.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第2期63-66,共4页
Proceedings of the CSEE
基金
国家自然科学基金项目(19872026)
教育部骨干教师计划项目
