Parametric study of an augmented railgun

Gallant, Johan

doi:10.1109/tmag.2002.806390

Cited by 47 publications

(13 citation statements)

References 6 publications

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“…Employing augmented rails, segmented rails, multi-supply sources, and some other methods confirmed a significant effect on inductance gradient [2], [3]. A practical solution to the problem of launching massive projectiles to high velocities with existing limitations on a railgun length requires increasing the driving electromagnetic force while providing the necessary mechanical, thermal and electrical performance and erosion resistance of the barrel and armature [4].…”

Section: Introductionmentioning

confidence: 96%

Simulation of launching several projectile by a multi-turn railgun by 3D-FEM

Keshtkar

Gharib

Bayati

2012

2012 16th International Symposium on Electromagnetic Launch Technology

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The use of a multi-turn railgun is a method for decreasing the current without reducing the electromagnetic force on the projectile. The objective of this investigation is the study of a novel multi-turn railgun that can launch several separated launching synchronously or unsynchronously. this method more over than distributing the force on the projectiles, prepare the projectiles launching with time spacing. The railgun has two barrels stacked in series and is powered by one pulse power supply. In this study by using a finite-element method we will simulate a three-dimensional railgun. The projectiles are in different position and in this research it is investigated by obtaining The self inductance gradient and mutual inductance gradient for each position of armatures that way it can regulated time of launch with changing the configuration of launcher . Moreover, Here it is obtained how launching time , which is directly proportional to the propulsive force, depends and is limited by rails and armatures geometry, armatures initial positions and armatures mass and material.

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Section: Introductionmentioning

confidence: 96%

Simulation of launching several projectile by a multi-turn railgun by 3D-FEM

Keshtkar

Gharib

Bayati

2012

2012 16th International Symposium on Electromagnetic Launch Technology

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“…However, usually the resistance of the pulse-forming unit and the cables is accountable for the major part of the overall resistance rather than the resistance of the launcher itself. The inductance gradient mainly depends on the geometry of the launcher [6] and can be increased using magnetic field augmentation [7]. The use of capacitor-based power supplies is the most common way to operate an electromagnetic launcher.…”

Section: Introductionmentioning

confidence: 99%

The Modular Augmented Staged Electromagnetic Launcher Operated in the Energy Storage Mode

Roch

Hundertmark

Loffler

et al. 2015

IEEE Trans. Plasma Sci.

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Railguns use electrical energy to accelerate projectiles to large velocities. The electrical energy for the launching process is provided by a pulsed power unit. A pulsed power unit usually consists of a capacitor, a switching device, a crowbar diode, and a pulse-forming inductance. The pulseforming inductance is necessary to generate an appropriate current pulselength and amplitude. The idea of the energy storage augmented electromagnetic launcher is to use the magnetic field produced by the pulse-forming inductance to augment the magnetic field between the rails of the launcher. To maximize the augmentation of the magnetic field, it is necessary to place the pulse-forming inductance as close as possible to the rails of the railgun. The additional magnetic field causes not only an increased acceleration of the projectile but also a larger mechanical load of the railgun structure. This requires a reinforced housing compared with conventional railgun housings. In this paper, the design and the experimental setup of a railgun using an energy storage augmentation scheme as well as the results of experiments are presented. The results are compared with the previous results of a nonaugmented railgun configuration. The comparison shows an improvement of the energy efficiency.

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“…Under the same current, SAG's armature can get greater electromagnetic force and higher muzzle velocity [1]. The development of SAG effectively alleviate the contradiction between the rail ablation which caused by high current and the muzzle velocity [2].…”

Section: Introductionmentioning

confidence: 99%

Research on Series-connected Augmented Railgun Inductance Gradient and Its Influencing parameters

Wan¹,

Wang²,

Li³

2015

Proceedings of the 2015 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering

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Abstract. The inductance gradient is one of the most important indexes to evaluate the performance of the electromagnetic railgun. It has important theoretical and practical value to research the inductance gradient and its influencing parameters. According to the Biot-Savat's law and the principle of virtual work, the expression of the inductance gradient considered the skin effect of current has been given, and by using Monte-Carlo algorithm the numerical solution has been calculated. In order to verify the correctness and accuracy of the model, the finite element simulation software is used to compare with the numerical solution. Based on the model, the influencing parameters of inductance gradient has been analyzed, and the variation of the inductance gradient has been summarized. The results show that, the inductance gradient decrease with the separation distance between the inside and outside rail, decrease with the height and width of the rail, increase with the displacement of the armature then tend to constant. The research can provide a reference for the design of series-connected augmented railgun.

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Parametric study of an augmented railgun

Cited by 47 publications

References 6 publications

Simulation of launching several projectile by a multi-turn railgun by 3D-FEM

Simulation of launching several projectile by a multi-turn railgun by 3D-FEM

The Modular Augmented Staged Electromagnetic Launcher Operated in the Energy Storage Mode

Research on Series-connected Augmented Railgun Inductance Gradient and Its Influencing parameters

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