Keywords: catenary, wave propagation, wave velocity, wave length, frequency.

In this paper, some models and methods to investigate the wave propagation characteristics of the catenary are proposed. Then, the influence of different catenary models on the wave propagation characteristics is investigated. Furthermore, for the catenary system of Beijing-Tianjin High Speed Railway in China, the wave propagation characteristics, including wave velocity, wave length and frequency, etc. are obtained. Finally, a validation of the wave characteristics by means of the experiment is presented. The research demonstrates that for the different catenary models, there is an obvious difference in the wave propagation characteristics, such as the frequency, the wavelength and the mode distribution, etc. However, for these several kinds of models, when the wavelength is equal to 2L/n (n=1, 2, 3...), the same frequency and wavelength may also be found. Considering the actual structure and parameters of the catenary, it is reasonable to investigate the wave propagation characteristics of the catenary using the modelling method of model G. Furthermore, through the dynamic simulation of pantograph and catenary system; where the spectrum analysis, the wave velocity, the key frequency and the wave length may accordingly be determined. Through the laboratory experiment, it is proved that this model and method to investigate the wave propagation characteristics are effective.

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