Experiments to increase the used energy with the PEGASUS railgun

Hundertmark, S.; Schneider, M.; Simicic, Dejan; Vincent, G.

doi:10.1109/ppc.2013.6627462

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…The selected parameters are given in Table I. These constant parameters are taken from the PEGASUS Railgun project that is presented in [10]. Also, in [11], it is recommended to choose a linear current density between 30 and 43 kA/mm to decrease the transition possibility.…”

Section: System Constants and Limitationsmentioning

confidence: 99%

Optimization of a Convex Rail Design for Electromagnetic Launchers

Polat

Tosun

Ceylan

et al. 2020

IEEE Trans. Plasma Sci.

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A rail geometry with a convex cross section instead of a rectangular one provides a higher contact area, uniform current density, and less transition on the contact surface, and it increases the performance in electromagnetic launchers. In addition, the design of convex rails should be considered together with armature structure, the distance between rails, rail length, and parasitic masses that all have an influence on the overall efficiency and armature/rail transition. A novel complete rail and launch package optimization method is presented in this article. In the first part of this article, the optimum convex rail cross sections for five different separation values are found to obtain uniform current density distribution on rail cross section. For this part, a transient finite element (FE) model in 2-D is developed to calculate the current density distribution and combined with a real-coded genetic algorithm (GA). Then, the armature and sabot petal masses are calculated for each optimized rail geometry and each separation values. In the second part, the efficiency of each optimum design with different separation values is evaluated by a transient 3-D FE model with transient solver taking the calculated armature and sabot petal masses into account. Finally, the length of the rails of the final design is investigated for the transition phenomena. It is observed that 48-mm rail separation with 12.9-and 21-mm elliptical cross-sectional parameters has the highest exit velocity (2355 m/s) for 400-g projectile with uniform current density at inner rail surfaces.

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Section: System Constants and Limitationsmentioning

confidence: 99%

Optimization of a Convex Rail Design for Electromagnetic Launchers

Polat

Tosun

Ceylan

et al. 2020

IEEE Trans. Plasma Sci.

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“…Investigations of an electrodynamic accelerators are becoming more popular recently. Many studies have been carried out in terms of both military and industrial applications of the device (Hundertmark et al, 2014;Gieras et al, 2011;Domin and Kluszczy nski, 2013). A leading theme of these studies is constructional solutions for increasing value of the magnetic flux density in the area where the projectile is accelerating (Min et al, 2015;Vincent and Hundertmark, 2015).…”

Section: Introductionmentioning

confidence: 99%

Analysis of an iron-core and ironless railguns powered sequentially

Waindok

Piekielny

2018

COMPEL

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Purpose The purpose of this paper is to calculate and measure transients for two different constructions of electrodynamic accelerators (ironless and iron-core) supplied by a three-section power system (three capacitor banks). The optimization of power supply parameters (switch-on times and capacitances of individual sections) in terms of system efficiency has been carried out. Design/methodology/approach Calculations have been carried out using a field-circuit model. For three-dimensional magnetostatic analysis, the Maxwell software and finite element method (FEM) were used, while for circuit model, the Matlab/Simulink software was implemented. For optimization of the supply system parameters, the genetic algorithm was used. The mathematical models were verified experimentally by using the original laboratory stand. Findings The efficiency of the system is much higher in case of iron-core accelerator. In both cases, the results obtained for optimized supply settings are only slightly better than those obtained by simultaneously switching on the thyristors and for symmetrical capacity division. Research limitations/implications Due to the presented field-circuit model, eddy currents in rails have been neglected. In the field model, there was no possibility to combine current flow calculations with moving of the projectile. Originality/value Using the presented filed-circuit model, both electrical and mechanical transients could be calculated with sufficient precision. Thus, it could be used in the optimization of supply system. The solution time is low compared with the solution time of the transient field model.

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“…Electrodynamic accelerators (EA), commonly called railguns, are investigated for many years [1,2]. The first applications were a military ones [3,4]. However, in some publication, the railguns are considered as the acceleration system for space launchers [5,6].…”

Section: Introductionmentioning

confidence: 99%

Transient Analysis of a Railgun with Iron Core

Waindok

Piekielny

2017

ELECTROTECHNICAL REVIEW

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A calculation and measurement results of transients for an iron-core electrodynamic launcher have been presented in the paper. The magnetostatic field calculations have been made with using the Maxwell-ANSYS software, while the circuit part of the mathematical model has been implemented in MATLAB/Simulink package. The measurement verification has been carried out with using the original laboratory stand. The transients of excitation current, capacitor voltage and projectile velocity have been compared. A good conformity between calculation and measurement results has been obtained. Streszczenie. W pracy przedstawiono wyniki obliczeń i pomiarów sygnałów zmiennych w czasie dla wyrzutni elektrodynamicznej z rdzeniem ferromagnetycznym. Do obliczeń pola magnetostatycznego wykorzystano program Maxwell-ANSYS, natomiast część obwodową modelu matematycznego zaimplementowano w pakiecie MATLAB/Simulink. Porównano ze sobą przebiegi prądu wzbudzenia, napięcia na kondensatorach oraz prędkości wylotowej elementu ruchomego (pocisku). W obliczeniach dodatkowo wyznaczono siłę działającą na pocisk oraz jego przyspieszenie. (Analiza dynamiki akceleratora szynowego z rdzeniem ferromagnetycznym).

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Experiments to increase the used energy with the PEGASUS railgun

Cited by 6 publications

References 11 publications

Optimization of a Convex Rail Design for Electromagnetic Launchers

Optimization of a Convex Rail Design for Electromagnetic Launchers

Analysis of an iron-core and ironless railguns powered sequentially

Transient Analysis of a Railgun with Iron Core

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