Arc-Dynamic Calculations In The Rail Gun

Batteh, Jad H.

doi:10.21236/ada136529

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…Although the difference is almost negligible for a RAPID railgun, the expressions can yield a greater discrepancy for larger bore railguns. In obtaining equation (19), however, Batteh [12] assumed that the current in the plasma armature was distributed in the form of a thin sheet. In the RPIP series, the plasma armature length was found to range between 25 and 45 mm whereas for larger input currents such as those in the Rashleigh-Marshall experiment [17] it is expected to be much larger.…”

Section: Discussionmentioning

confidence: 99%

“…Referring to the propelling inductance per unit length as the effective inductance per unit length, Batteh [12] and Batteh and Powell [13] have evaluated it for the case in which both the rail and plasma current distributions are in the form of thin sheets. In particular, the current density in the plasma armature is given by…”

Section: The Difference Between the Equations Of Motionmentioning

confidence: 99%

“…If the plasma armature height were equal to the rail height, then a value of 0.49 µH m −1 would be obtained for L p . In [12] Batteh provides graphs of L p as given by equation ( 19) against the rail height ratio (h r /w) for h a /h r equal to 1.0 and 0.5. For all values of the rail height ratio considered L p was lower for h a /h r equal to 1.0 rather than it was for h a /h r equal to 0.5, the greatest relative difference occurring for h r /w greater than 1.5.…”

Section: The Difference Between the Equations Of Motionmentioning

confidence: 99%

“…In this section we aim to find general conditions under which the two inductances per unit length become equal. Since the contribution of the relatively slowly moving ions in the plasma armature can be neglected and the induced magnetic field due to the plasma armature B ind is negligible in comparison with the magnetic field due to the rails, equation (12) where the r subscript has been dropped for convenience. The electric current distribution j e (x, z, t) does not depend on the separation coordinate y explicitly since…”

Section: Conditions For the Equivalence Of L P And Lmentioning

confidence: 99%

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A study of the equations of motion for a plasma-armature railgun

Kowalenko¹

1997

J. Phys. D: Appl. Phys.

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The two derivations of the equation of motion for the plasma armature - projectile system in a railgun are reviewed. Although they describe the same kinematical system, it is shown that they yield conflicting descriptions for the action - reaction forces over the plasma armature. The two inductances per unit length for the equations of motion are then given for the case in which the rail and current distributions are in the form of infinitesimally thin sheets and are shown to be different, although for a RAPID railgun this difference is not significant. Next, the lumped-parameter version of the railgun equation of motion is shown to be incapable of explaining anomalous effects occurring in the plasma armature, which have been observed in railgun firings, whereas no such problem arises with the MHD version. Finally, sufficient conditions under which the equations yield equivalent results are given, though these may not be realized in most railgun applications. .

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Section: Discussionmentioning

confidence: 99%

Section: The Difference Between the Equations Of Motionmentioning

confidence: 99%

Section: The Difference Between the Equations Of Motionmentioning

confidence: 99%

Section: Conditions For the Equivalence Of L P And Lmentioning

confidence: 99%

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A study of the equations of motion for a plasma-armature railgun

Kowalenko¹

1997

J. Phys. D: Appl. Phys.

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“…Analytical will be suitable for solving simple problems and programming codes were used for numerical methods which is time consuming process. JianxinNie et al derived an proposed analytical expression from Batteh's formulae [4]- [6] by introducing rail thickness and skin depth. Here, they considered rail and armature parameters for deriving L' which gives an accurate result [7].…”

Section: Introductionmentioning

confidence: 99%

Inductance gradient and current density distribution for T-shaped convex and concave rail cross-sections

Kumar

Murugan

Shivkumar

2018

IJET

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Rectangular rail was the most widely used cross section shape for the rail gun electromagnetic launching (EML) system. Based on sector assimilation, the rail gun key parameter especially current density (J) and inductance gradient (L’) greatly affected. J decides the efficiency of EML and L’ decides the force acting on the projectile of EML. So, it is mandatory to look upon the sector assimilation of rails. In this paper T shape convex and concave shape rail cross section is proposed and rail gun key design parameters are calculated by varying its dimensions using Ansoft Maxwell 2-D eddy current solver which uses finite element analysis technique to calculate these parameters. The performance of rail gun discussed using the obtained values and it has been observed and that the compared with other considered rail geometries, the T-shaped concave model shows more impact on inductance value which causes uniform current density distribution over the rails.

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