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Shock and Vibration
Volume 2017, Article ID 1634292, 16 pages
https://doi.org/10.1155/2017/1634292
Research Article

Study on Galloping Oscillation of Iced Catenary System under Cross Winds

School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China

Correspondence should be addressed to Guo Chen; moc.liamtoh@52188elppa

Received 2 June 2017; Revised 29 August 2017; Accepted 6 September 2017; Published 22 October 2017

Academic Editor: Tai Thai

Copyright © 2017 Guo Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper mainly aims at revealing the nature of the galloping oscillation of iced catenary system under cross winds. The aerodynamic force on the iced catenary system is assumed to be quasi-steady, and then the quasi-steady aerodynamic lift and drag coefficients are completed in FLUENT. By fitting the discrete simulation data, the expression of the vertical aerodynamic force is further obtained. According to the Den Hartog vertical galloping mechanism, the stability of iced catenary is discussed and the initial icing angle corresponding to the critical stability is obtained. On this basis, the dynamic model of the simple iced catenary system under cross winds is established. The partial differential vibration equation of the system is converted into the ordinary differential equation by the Galerkin method and then numerically solved. The condition of the unstable catenary motion in simulation is in agreement with that from theoretical stability analysis. In addition, the effects of structural damping, initial icing angle, and wind velocity on the system responses are investigated.