Analysis of muzzle vibration under projectiles/barrel coupling effect

DOI:	10.11809/bqzbgcxb2024.07.023
Keywords:	eccentrically rotating beam;ammunition firearm coupling barrel vibration; time varying coefficient dynamic equation
Abstract:	In order to study the influence of bullet gun coupling on barrel vibration, considering the offset state of the barrel, an eccentric rotating beam model under bullet gun coupling was established. The kinetic energy and potential energy of the system were analyzed, and the action of the bullet movement on the barrel and the recoil of the gunpowder after the bullet firing were considered. The Lagrangian dynamic equation of the warhead/body tube coupling system was derived. Considering the structural characteristics of the system, the modal function of the barrel was assumed to be the modal function of the cantilever beam, thereby discretizing the vibration displacement of the barrel, and the dynamic equation after system discretization was obtained. The Runge Kutta method was used for numerical calculation to obtain the vertical displacement of the barrel at any position and any time. The calculation results are basically consistent with the experimental results, verifying the correctness of the model. The research shows that there is a small downward motion of the muzzle during the period of warhead in bore movement, but after the warhead exits the muzzle, the muzzle vibration displacement significantly increases and shows a free decay vibration pattern. Changing the bullet mass eccentricity will increase the muzzle vibration displacement and the amplitude of the barrel eccentric rotating beam system when the warhead exits the muzzle, which is a major factor affecting muzzle vibration.
Published:	2024-07-26
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