The wave motion velocity of catenary is the key parameter of dynamic pantograph-catenary characteristics of high-speed railways, which directly determines the highest running velocity of EMU. When the wave motion velocity is calculated, the influence of air clamping is not considered in general. In the paper, through deducting the wave motion velocity by the wave equation of the tension beam, the stressed model of catenary inclusive of air damping was built, and the wave motion velocity formula in consideration of air damping was deduced, by which the key parameters affecting the wave motion velocity of catenary were found. The relationship curve between the wave motion velocity of catenary and the tension-force-air damping coefficient was drawn and analyzed. The conclusions can provide helpful references to design and construction of catenary of high-speed railways.%接触线的波动速度是高速铁路弓网动态特性的关键参数,直接决定着动车组的最高运行速度.在计算接触线的波动速度时,一般未考虑空气阻尼对接触线波动速度的影响.本文通过对张力梁的波动方程中波动速度详细求解公式的推导,建立空气阻尼下接触线的受力模型,详细推导计及空气阻尼的接触线波动速度公式,找出影响接触线波动速度的关键参数,分析接触线波动速度与张力-空气阻尼系数的关系曲线,为高速铁路接触线的设计与施工提供借鉴.
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