Abstract
Abstract In this paper, dynamic analysis of two different weapon systems (35 mm Anti-Aircraft Barrel (AAB) and 120 mm Grooved Tank Barrel (GTB)) under the effect of statically unbalanced projectile has been performed with a new 12 DOF 3-D element technique using Finite Element Method (FEM). The muzzle deviations, which negatively affect the barrel shooting accuracy at firing, are calculated in a time dependent manner using Newmark β algorithm with high accuracy at both axes (y and z) considering the Coriolis centripedal and centrifugal forces. The effect of such fundamental physical parameters as shift from rotating center and angular velocity belonging to the unbalanced projectile on barrel dynamics are analyzed with this new and affective FEM. As a result, it was found out that 1% of a millimeter shift from projectile belonging to a weapon system leads to excessive vibration on both axes and compromises the shooting accuracy of the barrel.
Highlights
Received: March 09, 2018 In Revised Form: March 19, 2018 Accepted: March 31, 2018 Available Online: April 03, 2018Dynamic analysis of engineering structures under the effect of moving loads is a fundamental issue in several branches, especially defense industry, transportation systems, manufacturing industry and machine design, and has been studied by many researchers
Dynamic analysis of weapon systems under the effect of unbalanced projectile plays an essential role in terms of accurate determination of the shooting accuracy of these weapon systems
Literature shows that 2-D Finite Element Method (FEM) models developed considering axial and transverse vibrations of the barrel are not adequate in the identification of barrel tip deviations caused by unbalanced projectiles
Summary
Received: March 09, 2018 In Revised Form: March 19, 2018 Accepted: March 31, 2018 Available Online: April 03, 2018. A study which examined the transverse vibrations of barrel tip for a sports rifle barrel under the effect of unbalanced projectile both in static and dynamic terms is given in (Vitek, 2009). There is need for a more comprehensive, three-dimensional model in order to analyze the barrel vibrations under the effect of unbalanced projectile as the centrifugal force which affects the barrel by means of the unbalanced projectile which progresses inside the barrel by making both rotating and extrapolation movements will have components in two different directions In this case, there is need to develop a three-dimensional mathematical model in order to examine the shooting accuracy of weapon barrel. The effect of statically unbalanced projectile on barrel shooting accuracy for two different weapon systems such as 35 mm AAB and 120 mm GTB has been analysed using a special programme prepared in MATLAB commercial software, which is a new three-dimensional finite elements technique. The effect of basic physical parameters such as axis shift of statically unbalanced projectile on barrel vibrations has been comprehensively studied
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