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Dynamic of Tubes Crossed by High Speed Projectiles, Influence of Tube and Weapon Geometry on Accuracy and Dispersion

OPHÉLIE CHEVALIER, MATHILDA LIENNARD, ANDRÉ LANGLET, YANN GUILMARD, MARCEL MANSION, PATRICE BAILLY

Abstract


Gun accuracy is influenced by several parameters during the in-bore projectile travel. The aim of this study is to determine the influence of gun barrel straightness on projectile exit conditions, in order to understand how to improve weapon accuracy. A tridimensional numerical model is created in order to vary this parameter and to study its influence on the ammunition behavior during internal ballistics. The model will be validated using experimental firings, particularly with accelerometers embedded in the ammunition. These firings have required the development of an optoelectronic system to transmit accelerations in real time. The good correlation of the experimental and numerical results proves the representativeness of the model. The model can then be used now to perform parametric analysis and to determine the most penalizing straightness shapes for gun accuracy.

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