| The capacity and distance of electric power transmission increase along with the rapid development of industry and technology, the large-capacity and long-distance transmission system are widely used. Therefore, the safe operation of transmission lines is very important. As the carrier of electric power, the transmission line is key to ensure the safe operation of power line systems. There are so many accidents of transmission lines, due to the long-term influence of wind, rain, snow and other weather factors.? Aeolian vibration is the main reason for the damage of transmission lines, which occurs the most frequently. Aeolian vibration can cause fatigue failure of the transmission line and then affect their life directly. The research results of Aeolian vibration can effectively guide the design of transmission lines and anti-vibration measures, which makes the progress of science and technology service industrial development better. So the research has Practical significance and economic benefits.In this paper, Aeolian vibration of transmission lines is researched.Firstly, the mechanical model of transmission lines is established and the expression of vortex-induced force is derived, by applying the knowledge of elastic mechanics and fluid dynamics. Aeolian vibration equation is derived by employing the methods of classical mechanics. Secondly, the response of Aeolian vibration and the stability of transmission lines are analyzed by using averaging method, the influence on of the span, the diameter, the damping and other parameters of transmission lines Aeolian vibration is investigated through the numerical simulation. Finally, dynamic bending stress of transmission lines is studied, the influence of the sag-to-span ratio on dynamic bending stress and the distribution of dynamic bending stress in the entire transmission line are analyzed, the fatigue life of the transmission line is estimated based on the theory of fatigue damage. |
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