为进一步明确气动耦合特性对新月形覆冰单导线舞动幅值的影响，基于空气动力学理论，建立了新月形覆冰单导线风致振动响应模型。采用流固耦合方法对新月形覆冰单导线的位移时程进行了计算，分析了气动耦合特性对新月形覆冰单导线舞动幅值的影响。研究结果表明：频率比和自由度对新月形覆冰单导线气动升阻力系数的影响较小，说明新月形覆冰单导线在流场中受到的气动力不随自由度和频率比的不同而发生变化。在不同自由度系统中，新月形覆冰单导线在攻角为20°时发生大幅舞动。垂直单自由度系统中，新月形覆冰单导线舞动幅值受固有频率影响较大，固有频率越大，舞动幅值越小。垂直-水平两自由系统中，垂直频率等于水平频率时，新月形覆冰单导线发生耦合振动，此时新月形覆冰单导线垂直方向的舞动幅值大于其他频率下的舞动幅值。新月形覆冰单导线在流场中在发生舞动时，其水平方向运动会促进垂直方向振动，且新月形覆冰单导线在流场中的运动轨迹呈长条状。研究成果进一步明确了气动耦合特性对新月形覆冰单导线舞动的影响，可为工程上新月形覆冰单导线的舞动和防舞研究提供一定理论参考。

To further 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 crescent-shaped iced single conductor is established based on aerodynamic theory. The fluid-solid coupling method is used to calculate the displacement time history of the crescent-shaped iced single conductor, and the influence of aerodynamic coupling characteristics on the galloping amplitude of the crescent-shaped iced single conductor 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 crescent-shaped iced single conductor, which shows that the aerodynamic force on the crescent-shaped iced single conductor in the flow field does not change with the different degrees of freedom and frequency ratio. In different degrees of freedom systems, the crescent-shaped ice-covered single conductor gallops greatly at the angle of attack of 20°. In the vertical single-degree-of-freedom system, the galloping amplitude of crescent-shaped ice-covered single conductor is greatly influenced by the natural frequency, and the larger the natural frequency, the smaller the galloping amplitude. In the vertical-horizontal free system, when the vertical frequency is equal to the horizontal frequency, the crescent-shaped ice-covered single conductor is coupled to vibrate, and the galloping amplitude of the crescent-shaped ice-covered single conductor in the vertical direction is greater than that in other frequencies. When the crescent-shaped ice-covered single conductor gallops in the flow field, its horizontal movement promotes vertical vibration, and the trajectory of the crescent-shaped ice-covered single conductor in the flow field is long. The research results further clarify the influence of aerodynamic coupling characteristics on the galloping of crescent-shaped iced single conductors, which can provide some theoretical reference for the study of galloping and dancing prevention of crescent-shaped iced single conductors in engineering.

TM752??????

国家自然科学基金项目