Analysis Method of Galloping in Arbitrary Directions of Iced Conductors

Abstract:

Based on the analysis of galloping mechanism of a single degree-of-freedom system,the criterion for galloping in arbitrary directions of quasi-oval shape iced conductors is derived,and the occurrence possibility of along-wind galloping is also theoretically proved in this paper.Then,DenHartog criterion,Nigol criterion and the galloping criterion proposed in this paper are applied to analyzing the aerodynamic forces of quasi-oval shape iced conductors obtained from wind tunnel tests.The results indicate that not only the wind direction at which galloping takes place but also the galloping directions of the iced conductors can be obtained by using the present method.