Abstract
In terms of the excitation of barrel vibration on the motion modality of projectile during interior ballistic period, a finite element model considering the mutual coupling between projectile and barrel was established to study the dynamics. In consideration of the effects of propellant gas on dynamics response based on vibration theory, the real loading condition of propellant gas acting on barrel was defined by user-defined VDLOAD subroutine, which solved the problem of inaccurate loading and even the failure of loading of gases pressure in previous simulations. Simultaneously, the loading boundary condition was directed by the coupling process of powder combustion and projectile motion, modeled by the user-defined VUAMP subroutine. The dynamics responses of barrel with and without the radial effect of gas pressure were obtained. Moreover, with the aid of realization of radial loading of barrel, the influence of the deviation of mass center of barrel on its dynamics response was also investigated. The obtained results showed that the radial effect of gas pressure causes more violent dynamics responses and plays a non-negligible role in simulating artillery firing process. The dynamics response of barrel is sensitive to the deviation of mass center and the response increases with the increasing value of deviation.
Highlights
Firing accuracy of large-caliber artillery has become a focused issue
This paper presented an approach to realizing the dynamic loading process of propellant gas pressure on the tube inner wall
Based on the simulation results, the conclusions can be drawn as follows: 1) With the assistance of user-defined subroutine provided by main program, the dynamic loading process of the propellant gas pressure on the tube inner wall which is restricted by the motion position of projectile and the actual time was realized
Summary
Firing accuracy of large-caliber artillery has become a focused issue. When a weapon is firing, there are vibrations induced in the steel barrel as the bullet moves along it. Reference [5] set up the time-variant dynamic equations of the tube radial vibration subjected to a moving projectile by Euler-Bernoulli beam theory. In those works, The Bernoulli-Euler beam model was adopted to approximately substitute the actual interaction between barrel and projectile. Reference [7] developed a three dimensional finite element model of a large caliber gun using ANSYS commercial software and simulated its firing process in order to study the effects of various design factors on the dynamics response of the gun. Most of the existing researches on the movement of projectile in bore and the vibration response of barrel during firing cycle focused on the interaction of barrel with projectile, ignoring the radial effect of propellant gas acting on the inner wall of the barrel. The dynamics response with and without the radial effect of gas pressure being considered were compared, and the effect of mass eccentricity of barrel was studied
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