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Crystals 2017, 7(11), 346; doi:10.3390/cryst7110346

Galloping Reduction of Transmission Lines by Using Phononic Crystal

1
College of Mechanics and Materials, Hohai University, Nanjing 211100, China
2
Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China
3
College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 211100, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Abdelkrim Khelif and Sarah Benchabane
Received: 2 November 2017 / Accepted: 10 November 2017 / Published: 13 November 2017
(This article belongs to the Special Issue Phononics)
View Full-Text   |   Download PDF [4832 KB, uploaded 13 November 2017]   |  

Abstract

Considering the combination of the transmission lines and phononic crystals (PCs), we propose a new method to solve the problem of the galloping of overhead transmission lines. The method has two key points: attaching the suitable mass-spring system on each spacer, and periodically arranging the modified spacers along a transmission line. Based on the Bloch’s theorem, the PC transmission lines could generate vibration band gaps (BGs), which would reduce galloping. In order to implement our point, we establish the two-dimensional model of the PC transmission lines and derive the transfer matrix method to calculate the frequency dispersion relation of the vertical transverse vibration. Then, the extremely low frequency BG, in the range of galloping frequency, is obtained and verified based on an example of single conductor. To widen the BG range, we also study the effects of the spacer and the attached mass-spring system on the BG. The wide BG, which even covers the range of 0.338–0.909 Hz, could be given just by using the suitable setting of the spacer and mass-spring system. View Full-Text
Keywords: transmission line; galloping; vibration; phononic crystal; band gap transmission line; galloping; vibration; phononic crystal; band gap
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Han, L.; Zhang, Y.; Li, X.; Jiang, L.; Chen, D. Galloping Reduction of Transmission Lines by Using Phononic Crystal. Crystals 2017, 7, 346.

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