Characterizations of gun barrel vibrations of during firing based on shock response analysis and short-time Fourier transform

Gimm, Hak In; Up, Ki; Cho, Chang Ki

doi:10.1007/s12206-012-0335-5

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…However, the above studies focus on the contact collision between the projectile and the barrel, ignoring the influence of the propellant gas effect. However, in the process of firing, not only the projectile will contact and collide with the inner wall of the barrel, but also the high pressure propellant gas will scour the inner wall of the barrel, resulting in a certain elastic vibration of the barrel, which has a direct impact on the initial motion attitude of the projectile, and then affects the firing accuracy [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of projectile-barrel coupling vibration characteristics considering the radial effect of propellant gas pressure

Liu¹,

Yang²,

Yu³

et al. 2021

J. vibroeng.

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In view of the influence of projectile-barrel coupling on tank firing accuracy, a finite element model of projectile-barrel coupling based on vibration theory was established. By defining user subroutines to simulate the change of the physical field of interior ballistics, the load condition under which the propellant gas radial pressure acts on the inner wall of the barrel and varies with the motion of the projectile is realized. On this basis, the dynamic characteristics of projectile-barrel coupling considering the radial effect of propellant gas pressure were studied. The reference targets such as cradle, projectile and muzzle were selected for analysis, and compared with the situation without considering the radial effect of propellant gas pressure. The results show that the motion trend of the projectile in the bore and the response law of muzzle vibration change greatly when considering the radial effect of propellant gas pressure and these changes may seriously affect the law of projectile dispersion. The radial effect of propellant gas pressure can cause stronger dynamic response, which cannot be ignored in the simulation of artillery firing process. This work provides a practical reference for further study of tank firing accuracy.

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Section: Introductionmentioning

confidence: 99%

Analysis of projectile-barrel coupling vibration characteristics considering the radial effect of propellant gas pressure

Liu¹,

Yang²,

Yu³

et al. 2021

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…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). The researcher has studied the eight degree of freedom model of a weapon system with its body, and analyzed the vibration of its barrel (Balla, 2011).…”

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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“…Propellant gases pressure belongs to high-impact load and its amplitude and loading distribution vary with time, characterized with dynamic effect of step type pulse and playing a non-neglected role in motivating barrel vibration. In consideration of the interaction of barrel with projectile, the vibration of barrel acts as the excitation factor for the movement of projectile during interior ballistics process [1]. Most researchers work at firing accuracy from the point of view of barrel vibration and have confirmed that the muzzle initial disturbance is the key factor that affects the projectile dispersion [2].…”

Section: Introductionmentioning

confidence: 99%

Dynamics analysis on barrel considering the temporal and spatial distribution of propellant gas by numerical simulation

Yu¹,

Yang²,

Sun³

2018

J. vibroeng.

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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.

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Characterizations of gun barrel vibrations of during firing based on shock response analysis and short-time Fourier transform

Cited by 10 publications

References 6 publications

Analysis of projectile-barrel coupling vibration characteristics considering the radial effect of propellant gas pressure

Analysis of projectile-barrel coupling vibration characteristics considering the radial effect of propellant gas pressure

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

Dynamics analysis on barrel considering the temporal and spatial distribution of propellant gas by numerical simulation

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