Dynamic response of a 120 mm smoothbore tank barrel during horizontal and inclined firing positions (original) (raw)
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Latin American Journal of Solids and Structures
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.
Dynamics and Stability of Gun-Barrels with Moving Bullets
In this study, the stability of a Timoshenko beam under the effect of a moving projectile will be reintroduced using simple eigenvalue analysis of a finite element model. The eigenvalues of the beam change with the mass, speed, and position of the projectile, thus, the eigenvalues are evaluated for the system with different speeds and masses at different position until the lowest eigenvalue reaches zero indicating the instability occurrence. Then the dynamics of the beam will be investigated using the Newmark algorithm at different values of speed and mass ratios. It is concluded that the technique used to predict the stability boundaries is simple, accurate, and reliable.
The Analysis Of The Vibratory Movement Of The Gun Barrel And Its Influence On The Firing Accuracy
International conference KNOWLEDGE-BASED ORGANIZATION, 2015
It is known that the forces and shocks that occur during the firing process of a firearm induce vibrations to the barrel of the weapon and to the weapon as a whole. There are flexural, longitudinal, radial and torsional vibrations. The most important ones are considered to be the flexural or bending vibrations, especially the ones recorded in the muzzle section. This paper presents a method of recording the flexural vibrations of the barrel in the muzzle section of a 5,56mm automatic rifle and the influence of muzzle devices, using modern equipment (high speed cameras) and dedicated software.
Journal of KONES, 2008
The intended aim of studies on the modelling of a bullet interacting with a barrel is to generate a virtual, computer-based model, experimentally verified for some selected mating conditions, and to become able to predict – with strong probability – processes and phenomena that take place within a system with imperfections. In the case under consideration the problem of contact between the barrel and the bullet has been described with the calculation method based on the penalty function. Calculations were made using the so-called direct-integration procedure, colloquially called the ,,explicit integration”. Preliminary analysis has been carried out on the effect of the shift of the centre of mass of the bullet moving in the barrel. Simulation included the bullet displacement along the barrel’s axis, with the assumed positions of the centre of mass –5% and +5% as measured from the bottom and referred to the initial model (0%). Results of numerical calculations suggest the effect of s...
Design and analysis of a gun barrel chamber
A gun barrel is the backbone for any type of firearm which is capable of firing any type of material with the help of stored energy either by compressing the gas and explosion of the propellants or by any other mean. During the process of firing a bullet or projectile the barrel undergoes many types of loads which produce stresses in it. So that the design of the barrel must be strong enough to withstand the heavy pressure loads. Due to the absence of the design data a simple design of the gun barrel was made using cad software. The chamber of the gun barrel was designed for the 14.5 x 114 mm bullet also known as 0.57 caliber bullet. In most of the developing countries homemade fire arm is a major problem faced by the criminologist not only because it was dangerous for the society but it is also dangerous for the holder itself. Most of the home made fire arms are made up of cheap steel and are weak in there fabrication. Keeping this thing in mind the gun barrel was to be of structural steel, to perform static analysis using ANSYS. Using a finite element analysis package a model was generated for the analysis purpose. This paper deals with the analysis of the gun barrel for the given boundary conditions. Keywords-firearm; barrel chamber; 0.57 caliber bullet; finite element analysis.
Dynamic Response of Cantilevered Rail Guns Attributed to Projectile/Gun Interaction—Theory
IEEE Transactions on Magnetics, 2007
An analytic approach is proposed to investigate the dynamic behavior of laboratory rail guns resulting from launching a projectile. The rail gun is modeled as a beam of finite length sitting on an elastic foundation with cantilevered support at the breech end of rails. The structural response of the rail is governed by a transient fourth-order differential equation with an extra term of elastic support (containment and insulator) subjected to a transient forcing function (a moving magnetic pressure). The complete solution of the governing equation is derived and illustrated in details. The displacement solution can be further derived to obtain strain and stress profile as well as dynamic response of the rail gun. This paper mainly reports the theoretic solution which provides a step forward to predict the dynamic behavior of rail guns.
Dynamics of a Cannon Barrel-Recoil Mechanism with a Nonlinear Hydraulic Damper
2014
Different types of dampers are available for use in the recoil mechanism of military cannons. The objective of this paper is to investigate the dynamics of the barrel assembly-recoil mechanism of military cannons when using a hydraulic damper and a constant stiffness helical spring in their recoil mechanisms. The damping characteristic of the hydraulic damper is nonlinear and the recoil mechanism orientation introduces extra nonlinearity to the dynamic model of the system. An extremely nonlinear model of the barrel assembly is derived and solved using Runge-Kutta 4 method to provide the dynamic response of the barrel assembly upon firing. The simulation results using the data of a Howitzer M114 cannon are presented for recoil mechanism orientation ≤ 50 degrees. The performance of the recoil mechanism is evaluated through the minimum and maximum displacements of the barrel assembly and the settling time of its response upon firing. The analysis shows that the least minimum displaceme...
Dynamics of a Cannon Barrel-Recoil Mechanism with Nonlinear Air-Springs
International Journal of Innovation and Applied Studies, 2014
The objective of this paper is to investigate the dynamics of the barrel assembly-recoil mechanism of military cannons when using air springs and a constant damping coefficient hydraulic damper in their recoil mechanisms. The elastic characteristics of the air spring is nonlinear and the recoil mechanism orientation introduces extra nonlinearity to the dynamic model of the system. An extremely nonlinear model of the barrel assembly is derived and solved using Runge-Kutta 4 method to provide the dynamic response of the barrel assembly upon firing. The simulation results using the data of a Howitzer M114 cannon are presented for recoil mechanism orientation ≤ 50 degrees. The performance of the recoil mechanism is evaluated through the minimum and maximum displacements of the barrel assembly and the settling time of its response upon firing. The effect of the number of air springs on the performance of recoil mechanism is investigated. The analysis shows that it is possible with air springs to obtain barrel assembly response similar to that of a critically damped second-order system. It is possible with proper selection of the recoil assembly parameters to decrease the maximum barrel displacement to 54 mm and the settling time to less than 2 seconds.