The purpose of this study is to analyze the galloping characteristics of the catenary positive feeder in fluctuating wind areas considering dynamic-wind angle of attack and aerodynamic damping. Firstly, the flow field model of the catenary positive feeder was established, the fluctuating wind field was simulated by Davenport wind power spectrum and linear filtering method, and the wind speed at inlet in calculation domain was controlled by editing the profile file to simulate and calculate the aerodynamic characteristics of the positive feeder in the fluctuating wind area. Then, taking the positive feeder as the research object, the mathematical model of actual structure and the corresponding finite element model were established. By applying the wind load to the finite element model, the influence of aerodynamic damping caused by the self-movement of the positive feeder on the galloping response was analyzed, and the frequency domain characteristics of galloping displacement of the positive feeder considering aerodynamic damping were studied. Finally, the calculation method of aerodynamic damping by the Guidelines for Electrical Transmission Line Structural Loading (ASCE No.74) was used for the galloping response of the positive feeder and compared with the proposed method. The results show that when considering aerodynamic damping, the galloping amplitude of the positive feeder decreases significantly, and the first-order resonance effect on the vertical displacement and horizontal displacement decreases significantly. The galloping trajectories calculated by the two methods are consistent. Therefore, this study is of great significance to further clarify the ice-free galloping mechanism of the catenary positive feeder in violent wind areas.

To clarify the impact of aerodynamic coupling characteristics on the galloping amplitude of crescent-shaped iced single conductor, an analysis model of wind-induced vibration response of the conductor is established based on aerodynamic theory. The fluid-structure coupling method is used to calculate the displacement time history of the conductor, and the influence of aerodynamic coupling characteristics on its galloping amplitude is analyzed. The results show that the frequency ratio and the degree of freedom have little influence on the aerodynamic lift-drag coefficient of the conductor, which shows that the aerodynamic force on the conductor in the flow field does not change with the different degrees of freedom and frequency ratio. In different degrees of freedom systems, the conductor gallops greatly at the angle of attack of 20°. In the vertical single-degree-of-freedom system, the galloping amplitude of the conductor is greatly influenced by the frequency ratio, and the larger the frequency ratio, the smaller the galloping amplitude. In the vertical-horizontal two-degree-of-freedom system, when the vertical frequency is equal to the horizontal frequency, the conductor is coupled to vibrate, and its galloping amplitude in the vertical direction is greater than that in other frequencies. When the conductor gallops in the flow field, its horizontal movement promotes vertical vibration, and its motion trajectory in the flow field is elongated. The research results clarify the influence of aerodynamic coupling characteristics on the galloping of crescent-shaped iced single conductor, which can provide some theoretical reference for the study of galloping and dancing prevention of the conductor in engineering.