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This paper’s objective is to contribute to the optimization of the problem of guiding forces during the movement of a railway vehicle. The paper proposes an innovative solution as compared to classical authors’ suggestions, which are limited to a small number of alternatives. The methodology follows an experimental approach. A two-stage experiment is performed where experimental conditions are modeled after profiles designed following a curved path with a radius of 500 m (by definition classified as tight curve). Standard profiles were used in the first experimental stage used, while curvilinear profiles were exploited the second experimental stage. After the experiment was conducted, data concerning (1) displacement (2) moments of force and (3) guiding forces of wheelrail contact were analyzed and compared for both stages: both standard profiles and curvilinear profiles. After considering the experimental results, the major conclusions of the paper are: (1) in the case of curvilinear profiles, small movements of the vehicle lead to a change in the size of the wheel displacement smaller than the corresponding change in standard profiles; (2) moments of force are greater in the case of standard profiles compared to curvilinear ones; and (3) curvilinear profiles enable movement without many contact points with the wheel, friction forces exert their action in longitudinal direction, thus causing a smaller value of guiding forces.

THE OPTIMISING FORCE BALANCE EXERCISED IN THE WHEEL – PROFILE CONTACT FORCE DURING THE CURVED PATH. AN EXPERIMENTAL APPROACH OF USING CURVILINEAR PROFILES