Propagation evolution of aeolian vibration waves in an overhead conductor under local instantaneous excitation
CHEN Xiaojuan1，LI Zhenchao1，WANG Zhangqi2
1.School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2.Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Abstract：Aeolian vibration is an important cause of fatigue strand breaking and line breaking of overhead conductor. It is of great theoretical and practical value to study the propagation evolution of aeolian vibration wave of long span conductor. The overhead conductor is simplified into a continuous string model dominated by tension. Considering the randomicity and instantaneity of local lock-in, the local lock-in formed by the conductor at any time and at any position is simplified into instantaneous pulse excitation. The double green function solution of the system is obtained by using Fourier transform and Laplace transform method, and the propagation and reflection laws of pulse wave are analyzed. Furthermore, the local instantaneous excitation method was used to test the propagation evolution characteristics of the internal wave in the wire, the high definition camera was used to capture the vibration wave, and the video image processing and analysis were carried out based on self-programmed programs.The results show that the self-programmed program can extract the instantaneous displacement of the marked measuring points, the wave velocity is constant during the propagation of the pulse wave, and the wave surface profile can maintain a good shape without deformation. The pulse wave formed by local instantaneous excitation propagates along the conductor to the ends on both sides. After being restrained by the ends, the reflected wave formed on both sides propagates along the conductor. After meeting, the reflected waves formed on both sides overlap each other, causing the conductor vibration. The experimental phenomenon is consistent with the theoretical analysis .
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