Analysis of Aeolian Transmission Conductor with Dampers by the Finite Element Method
Analysis of Aeolian Transmission Conductor with Dampers by the Finite Element Method
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发表时间：
2008
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通讯作者：
Liang Zheng-ping
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作者：
Liang Zheng-ping
采用不同于传统能量平衡法（EBM）的有限元方法，研究了带有斯托克布里奇阻尼器的1000kV特高压输电导线垂直、稳态、单频气动振动问题。采用电缆单元对导线进行模拟；阻尼器采用质量单元和梁单元。利用能量等效理论对有限元仿真模型中的气动振动力、导体自阻尼和斯托克布里奇型阻尼器阻尼等参数进行了重点分析。利用Diana Falco发表的风力曲线对涡旋诱导的气动振动力进行了推导；将导体和阻尼器的滞回阻尼和摩擦阻尼转化为粘性阻尼。根据幅值与曲率的关系，得到了导体内部动态弯曲应变的分布。以1000kv特高压输电导线为例；采用EBM模型和FEM模型分别计算了带阻尼器和不带阻尼器的导体。有限元模态计算结果与不加阻尼器的有限元模态计算结果相似，但在导体跨端附近加装阻尼器时，有限元模态计算结果要大得多。也就是说，阻尼器的位置和这些动态特性是可观察到的影响因素，有限元模型具有考虑导体振动、阻尼器质量和阻尼器刚度的多种空间模态的能力。此外，通过这些计算，对1000kv特高压输电导线的研究也得出了其他的观点。
The vertical, steady-state, monofrequent aero-vibration of a single 1000kV UHV transmission conductor with a Stockbridge-type damper attached was researched by the finite element method (FEM) differing from the traditional energy balance method (EBM). The conductors were simulated by cable element; the dampers by mass element and beam element. The parameter of FEM emulation mode such as aero-vibration force, the conductor self-damping and the Stockbridge-type dampers damping were emphasized by the energy equivalent theory. The aero-vibration force induced by vortex was educed by wind power curve which was published by Diana Falco; the hysteresis damping and friction damping of conductor and damper were translated into viscous damping. Based on the relationship between amplitude and curvature, the distribution of dynamic bending strain alone the conductor was obtained. By taking 1 000 kV UHV transmission conductor as an example; the conductor with and without dampers were computed by the EBM model and FEM model respectively. The result of FEM modal is similar to that of EBM without dampers, but much larger when with dampers attached near a conductor span end. That's to say, the dampers position and these dynamic characteristics were observable influential factors, and FEM model has the capability to account for more than one spatial mode of conductor vibration, damper mass and damper stiffness. In addition, other viewpoints were obtained through those computations for serving the 1 000 kV UHV transmission conductors research.