A concise computer code for in-bore balloting of APFSDS is formulated.The basics of the model is that long rod was taken as a Bernoulli-Euler beam with freefreeends. Forces are distributed in accordance with the natural mode of vibration. Thisallow us to neglect ambiguous contact between sabot and rod. Tube is simulated as acantilever of Bernoulli-Euler beam having gravity droop, regional warp of the centerline.Vibrations of gun tube are excited by Recoil Load, "Bourdon" pressure, Projectilecollision, and Bearing support. This analytical model is formulated and operated on apersonal computer. Time to calculate one shot is about 10 to 20 minutes and it is useful toevaluate system constituents.
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