覆冰导线任意方向驰振分析方法

Analysis Method of Galloping in Arbitrary Directions of Iced Conductors

在分析传统单自由度驰振激发机理的基础上,推导任意风向作用下覆冰导线在任意振动方向的单自由度驰振判别式,从理论上证明顺风向驰振发生的可能性.分别运用DenHartog,Nigol判别式和上述判别式,分析风洞试验得到的准椭圆形覆冰导线模型气动力,判断准椭圆形覆冰导线发生驰振的可能性.结果表明,对覆冰导线,该方法不仅可得到可能发生驰振的风向,还可判断可能发生驰振的振动方向.

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.