Abstract
The displacement of the free end of a spring is not always an axial displacement. In some circumstances, the free end of the spring displaces along a circular trajectory, and the spring elongation is considered approximately equal to its axial displacement. Such an approximation is used for modelling the suspension of railway wagons. The present work purpose is to exactly determine the elastic force in case of spring free end circular displacement, in order to compute the error of considering this displacement equal to the spring axial displacement. Then, the real dynamic behavior of the model is compared with the approximate one, by numerical simulation.
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