Electromagnetic gun circuit analysis code (EGCAC)

Rolader, G.E.; Thornhill, L.D.; Batteh, Jad H.; Scanlon, J.J.

doi:10.1109/20.195626

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…However, the ⃗ F pr is not the only force that acts on the armature. Friction and drag forces, denoted as ⃗ F f ric and ⃗ F drag slow down the movement as in (7). ⃗ F f ric can be modelled as in ( 8) 24 where µ d and µ s are dynamic and static friction coefficients respectively.…”

Section: Kinemechanical Calculationsmentioning

confidence: 99%

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A Revised Inductance Distribution Analysis of Medium-Large Caliber Electromagnetic Launchers including a Large Bus Structure

Tosun¹,

Keysan²

2023

Preprint

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<p> </p> <p>An important application for large-scale pulse power supplies (PPS) is electromagnetic launchers (EMLs). These de- vices utilized stored several MJs of electrochemical energy into linear mechanical energy. Because of extreme physical conditions, simulations are crucial in electromagnetic launcher (EML) research. As the operation risk rises, more en- ergy into the system adds weight to the model’s accuracy. In this paper, the electromagnetic impact of the bus structure is discovered in a recently developed EMFY-3 electromagnetic launcher, is presented. An H-shaped bus structure is used for the current injection. However, experiments showed that the H-shaped bus changes inductance calculations. A careful examination is made to reveal the physical reasoning behind the bus impact. We hypothesize that the rail portion surrounded with bus geometry has less inductance than the rest due to the eddy current created by rail current transients, which should be calculated carefully through numerical calculations, i.e., 3-D Finite Element Method (FEM). Two dif- ferent simulation models were constructed to test the hypothesis. Moreover, rail currents, breech, and muzzle voltages are measured to investigate electromagnetic calculations. Results showed a good agreement with experiments where the bus structure was modeled explicitly. That aspect showed that the bus structure should be well-examined when multiple PPS are connected. </p>

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Section: Kinemechanical Calculationsmentioning

confidence: 99%

“…LCMs are constructed with some dynamic circuit elements, i.e., resistance and inductance gradients related to launching dynamics [6][7][8] . Dynamic parameters can be calculated analytically, or they can be extracted from numerical tools.…”

Section: Introductionmentioning

confidence: 99%

A Revised Inductance Distribution Analysis of Medium-Large Caliber Electromagnetic Launchers including a Large Bus Structure

Tosun¹,

Keysan²

2023

Preprint

View full text Add to dashboard Cite

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“…This also happens at subsequent instants. Let us assume a lower speed in the launcher with the conventional armature (this will be discussed later) and let us consider the lumped parameter model of the launcher [35], [36]. We see that all the parameters (namely resistance and inductance) are increasing function of the speed and of the distance z travelled by the armature, and as a consequence at a given feeding voltage, the lower the speed, the greater the current.…”

Section:  =mentioning

confidence: 99%

Numerical Analysis of a Transposed Multiwired Armature in Electromagnetic Rail Launchers

Consolo

Dio

Musolino

et al. 2020

IEEE Trans. Plasma Sci.

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Solid armatures in electromagnetic rail launchers have to undergo severe electromagnetic, mechanical and thermal stresses. These stresses are unevenly distributed in the armature mainly due to the Velocity Skin Effect. Contrasting this effect reduces the peak to average ratio of the stresses and allows better performance of the device. In this paper, the behavior of a transposed multi-conductor solid armature is numerically investigated by the research code EN4EM (Electric Network for ElectroMagnetics) developed at the DESTEC. The code is based on an Integral Formulation that reduces the magnetic diffusion problem in the analysis of a time-varying electric network. The code enables a strong electromechanical coupling and allows accounting for currents distribution in the rails and in the armature due to the proximity and 'ordinary' skin effects, as well as the velocity skin effect. Preliminary computations have shown an improved (more regular) current density distribution in the armature. This allows increasing the total current on the armature without reaching the melting temperature in the armature. Improved performance of the launcher with transposed armature is predicted.

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“…When it is launched, the magnetic field is distributed inside the launcher, which is generated by both the current of the driving coils (primary) and the current of the projectile (secondary). The intensity, variation and distribution of the magnetic field in different medium, the interlinking of the magnetic field and current, the material, form and size of the projectile [1] will determine the performance of the launcher. Therefore, if we hope to have a better understanding of the performance of the electromagnetic propelling system and its influential factors, it is necessary to establish the mathematical model of the electromagnetic field of the launcher, and to make the dynamic numerical calculation and simulation analysis of the magnetic suspension launcher [2] .…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Simulation and Dynamic Analysis about the Electromagnetic Propelling System of Magnetic Suspension Launcher

Zhang

Chen

Huang

et al. 2014

AMM

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Launcher is widely used in rescue and delivering items. On the basis of the electromagnetic theory, magnetic suspension principle and linear motor theory, we put forward the idea of magnetic suspension launcher. Through the theoretical research and simulation analysis, an in- depth study is also given to the distribution of the electromagnetic field and other influential factors concerning the propelling system, which provides the basis for the design of magnetic suspension launcher.

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Electromagnetic gun circuit analysis code (EGCAC)

Cited by 6 publications

References 13 publications

A Revised Inductance Distribution Analysis of Medium-Large Caliber Electromagnetic Launchers including a Large Bus Structure

A Revised Inductance Distribution Analysis of Medium-Large Caliber Electromagnetic Launchers including a Large Bus Structure

Numerical Analysis of a Transposed Multiwired Armature in Electromagnetic Rail Launchers

Electromagnetic Simulation and Dynamic Analysis about the Electromagnetic Propelling System of Magnetic Suspension Launcher

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