Performances results in the gymnastics vaults largely depend on the setup parameters of the gymnastics springboard. The purpose of this research was to determine the dependence of the springboard stiffness vs. positioning of the take-off point on the upper board. Bernoulli-Euler beam with spiral springs was used as a model of the upper board. A three-span bending beam as a mechanical and mathematical springboard model was studied using Clapeyron's Theorem of Three Moments. Changes in the springboard stiffness along the upper board were revealed using modeling and computer simulation. It was established that the rigidity of the springboard changes significantly with local maximums in the placements of the spiral springs. Experimental values of the springboard stiffness were determined using values of displacements of the loaded board by a standard external force of 3500 N. The experimental data were obtained with errors ± 0.5 mm. The model was approved by the results of experimental measurements with accuracy considered acceptable in engineering calculations and sport vaults training and competitions.
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