摘要
大跨越输电线路分裂导线较单导线更容易发生舞动现象,基于空间曲梁理论,建立了结点6自由度的导线有限元模型。假定间隔棒为刚性体,根据位移协调条件,建立了4分裂导线的有限元模型。通过虚功原理建立静力有限元方程,采用Newton-Raphson迭代法进行静力非线性求解。算例表明:采用曲梁模型研究输电线的平动位移是准确的。由于考虑了平动与扭转的耦合作用,扭转角的计算更加精确。输电线抗弯刚度对扭转角也有较大影响。分裂导线的参数分析表明,弧垂、分裂间距、边界条件等对抗扭刚度均有较大的影响,间隔棒的数量不能显著提高导线的抗扭刚度。
Long span transmission bundle lines will more easily suffer galloping phenomenon than a single wire Based on space-curved-beam theory, the finite element model based on 6-DOF node is built to simulate a transmission line. The spacers are assumed as a rigid body, and the finite element model of 4-bundle conductors is established according to the displacement compatibility conditions. The static finite element equation is built through the virtual work principle and solved by the Newton-Raphson iterative method. The results of examples show that the curved beam model of a transmission line is accurate to calculate the translational displacement. Considering the coupling of the translational and torsional deformation, torsion angle calculations are more precise, and the bending stiffness of the transmission line will also affect the torsional angle. The results for the parameter analysis of bundle conductors show that sags, split spacings, spacers, and boundary conditions have more great influence on the torsional stiffness, whileas the number of spacers cannot significantly increase conductor torsional stiffness.
出处
《工程力学》
EI
CSCD
北大核心
2012年第8期325-332,共8页
Engineering Mechanics
基金
中央高校基本科研业务费项目(CDJZR11200015)
国家自然科学基金项目(51178489)
关键词
曲梁
输电线
有限元模型
分裂导线
非线性
curved beam
transmission line
finite element model
bundle lines
nonlinear
