微风振动下导线的响应及振动防治

摘要

针对微风振动过程中导线以及防振锤消耗振动能量的问题,设计了导线室内振动自阻尼试验以及防振锤消振试验.通过导线自阻尼试验拟合推导出导线的自阻尼公式,并使用能量平衡法计算出导线振动频率和幅值之间的关系.在防振锤消振试验中,采用光纤光栅应变采集系统分别测量导线刚性固定端出口、防振锤与导线连接的线夹处以及防振锤钢绞线处等应变,对比分析可知,在导线振动频率接近防振锤自振频率第4阶频率时,防振锤钢绞线的应变存在峰值,钢绞线弯曲消耗的振动能量较大,据此提出可以依据钢绞线消耗振动能量的重点频段来设计防振锤.%In allusion to the problem of energy consumption of wires and dampers in the course of aeolian vibration, self-damping test for indoor vibration of wires and anti-vibration test for dampers were designed.The self-damping formula was fitted and derived according to self-damping test and then relationship between vibration frequency and amplitude of the wire was calculated by energy balance method.In the anti-vibration test, fiber bragg grating (FBG) strain acquisition system was used to respectively measure strain of fixed tube outlet of the wire, the damper, cable clamps and the steel strand of damper.Comparison and analysis results show there is a peak value of strain of the steel strand when vibration frequency of the wire is close to the fourth order frequency of natural vibration frequency of the damper, and vibration energy wasted for bending of the steel strand is larger.Hereby, suggestion of designing the anti-vibration damper according to important frequency band of energy consumption of the steel strand is proposed.