【作者】 黄伟；

【导师】 谢献忠； 周游；

【作者基本信息】 湖南科技大学 ， 建筑与土木工程（专业学位）， 2016， 硕士

【摘要】 作为国家经济建设高速发展的基础和保障,输电线路的安全运行至关重要。由于输电线路常年暴露在外界环境中,时刻受到来自大自然中风、雪、雨等因素的影响。根据有关资料证明,覆冰荷载已成为输电线路损害事故的最大威胁之一。所以对输电线路覆冰和脱冰开展理论和试验研究有着重要的工程意义。本文针对架空输电线路的脱冰跳跃和减振控制进行较深入的研究,具体完成了如下工作:(1)将输电线的脱冰荷载视为一种突加动荷载,考虑阻尼的衰减效应,基于功能原理和能量守恒定律,推导了导线跳跃高度的理论计算公式。该公式揭示了脱冰跳跃的动力学本质,建立了跳跃高度与弧垂差的定量关系,且计算结果与有限元分析结果吻合良好。(2)基于动力吸振减振和碰撞耗能减振原理,设计了一种在极端激励环境下能够提高输电导线减振效果的碰撞式防振锤,并根据塔线体系的动力特性,对新型防振锤的结构参数进行了优化。(3)根据动力相似理论,设计制作了输电塔线试验模型,并进行了多种工况的脱冰跳跃试验,通过比较安装碰撞式防振锤前后重要节点的峰值位移及减振率,验证了碰撞式防振锤应用于输电导线脱冰减振的有效性。更多还原

【Abstract】 As the foundation and guarantee of the fast development of national economy, it’s of vital significance in the operation safety of transmission lines. Due to the frequent exposure to the natural environment, the transmission lines are always under the influence of the factors of wind, snow, rain and so on. According to the related documents prove that there is practical engineering meaning in the theory and experiment study regarding the transmission lines’ icing and ice-shedding. The paper focuses on the study of the ice-shedding jump and vibration-reduced control of the transmission lines. The detailed work is completed as follow:(1) Regarding the transmission lines’ ice-shedding loads as the sudden dynamic loads and in consideration of the attenuation effect of damp as well, the theoretical formula for the transmission lines’ jump height is conducted based on the function principle and conservation of energy. The formula reveals the dynamics essence of ice-shedding jump, which established a quantitative relation between jump height and sag difference. The two corresponds well when comparing the results between the theoretical formula and finite element.(2)On the basis of the vibration reduction principle of dynamic absorption and collision energy consumption, a bump damper is designed to enhance the damping effect of transmission lines in extreme motivation circumstance. And the structure parameters of new type damper are optimized based on the dynamic property of tower-line system.(3) According to dynamic similitude theory, transmission tower-line system model test is designed and made, conducting the ice-shedding jump experiment in different conditions. By comparing the peak displacement and damping ratio of the important points between the uninstall of bumping damper and the install of bumping damper, the effectiveness of bumping damper applied to the ice-shedding vibration reduction of transmission lines is verified.更多还原