Dynamic Characteristics of Railway Vehicles Subjected to Multiple Excitations with Phase Differences

The rotational response characteristics of an electric locomotive with three bogies are discussed in this paper. First, a full-scale electric locomotive was converted to mass-spring- damper system with multi-degrees of freedom, and the correctness of the modelling was verified by comparison with the results of vibration tests. Detailed analyses were then carried out using this mode. Two kinds of input with phase differences were used to evaluate the rotational vibration in the frequency response analysis. One method gave phase angles to the pair of sinusoidal waves which were applied to the front bogie and the rear bogie. The other gave a time delay and progression to each track input. Also, the rotational vibration characteristics are discussed with regard to the wavelength of the track and travelling speeds on the basis of the transient response analysis.