The longitudinal dynamics of railway vehicles is studied in this paper. The model is a time domain and nonlinear one. Model includes a train-consist containing one locomotive, nine wagons and nine automatic couplers between them. The effects of different parameters, (such as stiffness and damping of automatic couplers, train speed and train acceleration during both accelerating and braking process) on the longitudinal train dynamics are investigated in a parametric study. It is found that increase of the train operational speed has no effect on the maximum tractive forces while it results in increasing the maximum pressing forces as well as the RMS (Root mean square) value of the coupler forces. Higher acceleration during accelerating leads to higher maximum tractive and pressings forces and also higher RMS value of the coupler forces. Although increase of acceleration during braking results in higher pressing coupler forces, but it has no effect on the maximum tractive force.

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