Dynamic response of a 120 mm smoothbore tank barrel during horizontal and inclined firing positions

Esen, İsmail; Koç, Mehmet Akif

doi:10.1590/1679-78251576

Cited by 18 publications

(10 citation statements)

References 27 publications

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“…In addition, the effects of projectile's muzzle velocity, barrel inclination angle, projectile mass, serial firings on the forced and free vibrations of the gun barrel can also be determined. The details of the solution of the problem are given in 11,12,13 . By the addition of the support flexibility, recoil motion, implementation of the more realistic barrel boundary conditions, the firing instant can be simulated more accurately.…”

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confidence: 99%

Effects of Tank Gun Structural Components on the First Shot Hit Probability

2018

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Fire power for a main battle tank is one of the most important performance parameters like survivability and mobility. Fire power effectiveness is directly related to the first shot hit probability, performance of main gun, second armament, gun and turret drive system, fire control system, automatic target tracker, commander and gunner sight etc. First shot hit probability (a measure of cumulative effects of errors) is affected by the variations of the projectile parameters, the main gun structure uncertainties, fire control system errors, interaction between the projectile and the gun barrel and the unpredictable environmental changes. These errors and variations can be eliminated or minimised by understanding and simulating the firing event properly, manufacturing the related parts in high precision, using advanced fire control algorithms, and accurate sensors. In this review study, the effects of main gun structural components on the first shot hit probability are investigated taking into account all of the associated error sources. In order for a main battle tank to have both high and repetitive first shot hit probability under all battlefield conditions the gun structure should respond in a similar manner in successive firings without causing any abrupt change in performance. In this study, first the dynamic behaviour of gun/projectile system is discussed and then the design recommendations for the main gun components such as bearings, gun barrel, recoil system etc. to achieve higher first shot hit probability are reviewed.

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confidence: 99%

Effects of Tank Gun Structural Components on the First Shot Hit Probability

2018

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“…Gun-projectile interaction has been investigated through large amount of researches. Experimental setups, analytical and finite element models have been developed to simulate the gun-projectile interaction and to examine the sensitivity of parameters on the dispersion [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic interaction between the gun barrel and accelerating projectile during firing has been analytically examined 19,20 . The effects of projectile mass, exit velocity, acceleration effects and barrel inclination angle on the muzzle displacements have been determined.…”

Section: Introductionmentioning

confidence: 99%

Effects of Projectile and Gun Parameters on the Dispersion

Dursun

2020

Def. Sc. Jl.

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Main battle tanks constitute one of the most powerful fire powers for the armoured land forces. To use this very high fire power efficiently, the dispersion of shot impacts becomes crucial. Dispersion is affected by the aerodynamic factors, gun-projectile interactions, projectile and gun dependent factors, manufacturing tolerances and environmental factors. The change in aerodynamic factors and environmental conditions varies the aerodynamic forces applied on the projectile and this affects the dispersion characteristics of the projectile. In this study, the effects of the changes in recoil stiffness, gun support stiffness, projectile muzzle velocity and manufacturing tolerances of projectile forward/rear bourrelet diameters on the dispersion for 120 mm L44 and L55 calibre guns are investigated. Armour piercing fin stabilised discarding sabot type projectile is used in the analysis. Statistical dispersion analyses including interior ballistic, in-bore balloting and exterior ballistic analyses are conducted using PRODAS ballistic software. According to the results, it is determined that the decrease in projectile/bore clearance (forward/rear bourrelet diameter) results in improved dispersion of ammunition. The 10% changes from the nominal recoil stiffness and the vertical support stiffness values have negligible effects on the dispersion. In addition, the results show that muzzle velocity variations influence the dispersion in vertical direction substantially. Using the procedure applied in this study, it is shown that different clearance conditions can be analysed and most suitable tolerances may be determined taking into consideration of both the gun system performance and manufacturability.

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“…Another important application field of moving load problems is defense industry where it is widely used in determining the barrel vibrations caused by the interaction between the barrel and moving projectile. Some studies modelled using FEM are given in (Esen and Koç, 2015a, 2015b, 2013Koç et al, 2016) which deal with the dynamic interaction between barrel and projectile. The upside and downside movement of the barrel tip caused by the movement of projectile in the barrel has a negative effect on the shooting accuracy of the weapon system (Gimm et al, 2012;Littlefield et al, 2002b).…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of gun barrel vibrations due to effect of an unbalanced projectile considering 2-D transverse displacements of barrel tip using a 3-D element technique

Koç

Esen

Çay

2018

Lat. Am. j. solids struct.

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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.

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Dynamic response of a 120 mm smoothbore tank barrel during horizontal and inclined firing positions

Cited by 18 publications

References 27 publications

Effects of Tank Gun Structural Components on the First Shot Hit Probability

Effects of Tank Gun Structural Components on the First Shot Hit Probability

Effects of Projectile and Gun Parameters on the Dispersion

Dynamic analysis of gun barrel vibrations due to effect of an unbalanced projectile considering 2-D transverse displacements of barrel tip using a 3-D element technique

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