【作者】 李海燕；

【导师】 张爱社；

【作者基本信息】 山东建筑大学 ， 结构工程， 2012， 硕士

【摘要】 覆冰导线在一定风速下将会产生舞动,舞动是一种大振幅、低频率的自激振动。舞动的振幅一般都很大,所以会对输电线路有很大的威胁。随着电力建设的规模越来越大对舞动的深入研究是一项有意义的工作。本文就导线舞动的计算机模拟及防舞动技术两方面对舞动做了分析,论文的主要研究内容有：推导了平均风荷载作用下导线的初始形状及动力特性的计算公式。相对自重作用下的覆冰导线的初始形态和动力特性,本文给出了在平均风荷载作用下的初始形态和动力特性,为覆冰导线的气动性稳定性提供了更为准确的初始条件。平均风荷载作用下覆冰导线的自振特性计算公式能更全面的反映导线自振特性随弹性几何参数变化的规律及导线模态之间的相互关系。推导了考虑导线扭转自由度的三节点索单元的单元质量矩阵以及刚度矩陈,通过ANSYS理论分析了覆冰导线舞动。采用了三维空间梁单元模拟输电线路,建立了自己独特且实用的三维有限元模型,解决了对考虑水平、垂直、扭转三自由度覆冰导线进行动力学分析的基础问题。采用有限元分析的方法研究高压输电线路的舞动机理及舞动的全过程,通过与文献相对比,验证了本程序计算结果的准确性。在此基础上通过调整参数,找出风速、攻角、张力、跨长等因素对舞动的影响并对现有的舞动机理做出验证与分析。研究了压重防舞器及失谐摆在单导线和分裂导线上的效果。压重防舞器在单导线上效果较好,在分裂导线上效果较差；失谐摆在单导线上非常有效,在分裂导线上效果甚微。更多还原

【Abstract】 Ice cover in certain wire with often occur dance, it is a kind of low frequency, the large amplitude of self-excited vibration. The amplitude of the dancing is usually quite large, to the safe operation of the transmission line of great threat. As the electric power construction of large-scale development, further study of dancing is a very urgent task. But because of the complexity of the characteristics of transmission line dancing, people to dance mechanism not fully understood, must for transmission lines further research and study. This article from the response of the dancing in the simulation and the technical aspects of dance dance was studied, and the main research contents have papers:Deduced the average wind load of wires cladding ice static configuration and dynamic calculation formula. Relative to the dead weight of the ice cover under the action of the wire static configuration and dynamic characteristics, this paper presents an average of under the-action of the static configuration and dynamic characteristics, For ice cover of wires of pneumatic stability analysis provides a more accurate analysis of initial conditions. Average wind load wire cladding ice vibration characteristics formula can more fully reflect the vibration characteristics of the wire with elastic geometric parameters and change rules and wire modal of mutual relations.The wire is considered reverse, the freedom of the three-node cable unit mass matrix and stiffness matrix unit, through the ANSYS theoretical analysis the cladding ice dancing wires. The three-dimensional space beam element simulation of power lines, to set up their own unique and practical 3 d finite element model, solve the consideration of horizontal, vertical and reverse three degrees of freedom cladding ice on the basis of dynamic analysis of wire. The finite element analysis method of the research of hy transmission line dance mechanism and the whole process of dancing, through literature than with relative to verify the accuracy of the calculation results of this program. Based on this by adjusting the parameters, and find out the wind speed, Angle of attack, tension, across long to the influence of the factors such as dancing and existing dancing to verify and analysis of the mechanism.The heavy pressure the dance and the detuning in single wire and split on the effect of wire dance. The heavy pressure in the dance single wires effect is good, in a divided wires effect is poorer; Detuning in single wires is very effective, and in a split has little effect on the wires.更多还原