摘要
输电线路连续档分裂导线静平衡构形和固有频率的准确计算,对于线路设计、导线结构的动特性分析以及舞动分析计算都是很重要的。采用柔索模型,应用Hamilton原理推导了导线作大幅运动的运动微分方程,并得到了导线静态构形的计算公式。结合间隔棒对导线的约束关系,推导建立了基于位移增量有限元模型的单元质量和刚度矩阵;并应用获得的公式体系对实际三档分裂导线进行了静态构形和自由振动计算,计算实例证明了所用方法的可靠性及有效性。
It is important to calculate accurately the static configuration and natural frequency of bundle conductor of multi-span transmission lines for the line design, dynamic behavior determination and galloping prediction. There are no effective static analysis methods for such conductor structures. Based on flexible cable model, the governing differential equation for conductor large amplitude motion and the calculation formula for static configuration were derived by use of Hamilton principle. And on the basis of the incremental displacement finite element model, the mass matrix and stiffness matrix were obtained in consideration of the constraining conditions between conductors and spacers. In the end, the numerical results of static computation and calculation of free vibration for a triple-span power line structure with four bundle conductors model show the efficiency of the method in this paper. The computational results indicate that the method is effective and reliable.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第13期157-164,共8页
Proceedings of the CSEE
关键词
分裂导线
静力求解
有限元
模态分析
固有频率
bundle conductor
static computation
finiteelement
modal analysis
natural frequency
