Aselsan EMFY-1 Electromagnetic launcher: First experiments

Karagoz, Mustafa; Cevik, Yasin; Tan, Evren; Civil, Anil; Cavbozar, O.; Gocmen, Ulas; Yildirim, Baran; Durna, Emre; Şahin, Murat

doi:10.1109/ppc.2017.8291180

Cited by 9 publications

(5 citation statements)

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“…However, F pr is not the only force that acts on the armature. Friction and drag forces denoted as F f ric and F drag action in a direction that opposes the movement as in (2). F f ric can be modelled as in (3) where µ d and µ s are dynamic and static friction coefficients respectively [14].…”

Section: Sensitivity Analysismentioning

confidence: 99%

Inductance Gradient Calculations of EMFY-3 Electromagnetic Launcher

Tosun¹,

Keysan²

2021

Preprint

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<div>ASELSAN Inc. has been working on electromagnetic launch technologies since 2014. The first prototype, EMFY-1, has a 25 mm × 25 mm square bore and 3-m-length rails. The second prototype, EMFY-2, has a 50 × 50 mm square bore and 3-m-length. In this paper, a recently developed prototype, EMFY-3, is presented, which has a 50 × 75 mm rectangular bore and 6-m-length. The input energy of the PPS is doubled to 8 MJ, and the 2.91 MJ muzzle energy is obtained up to now. Rail currents, breech, and muzzle voltages are measured to investigate electromagnetic calculations. Velocity curves are captured with Doppler radar, which enables us to establish propulsive inductance gradient L0pr transients empirically. The results confirm that L0 pr is constant throughout the launch, as no significant breaking mechanism occurs with the non-magnetic containment. However, a slight variation (%2 at maximum) happens from one launch to another with different rails’ current magnitudes. The transition phenomenon is a candidate for the drop in the L0 pr, as it occurs more likely at launches with higher linear current densities.</div>

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Section: Sensitivity Analysismentioning

confidence: 99%

Inductance Gradient Calculations of EMFY-3 Electromagnetic Launcher

Tosun¹,

Keysan²

2021

Preprint

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“…This contribution becomes dominant as velocity rises. The term denoted as U r is expressed analytically and demonstrated in (3), where k is a geometry-dependent parameter, ρ r is the rail resistivity, V is the armature velocity, s is the rail separation. With the extension of U r the muzzle voltage becomes (4).…”

Section: Literature Surveymentioning

confidence: 99%

Muzzle Voltage Characteristics of Railguns

Tosun¹,

Keysan²

2021

Preprint

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Muzzle voltage is an essential diagnostic tool used in both contact resistance modeling and transition determination. However, it is challenging to stem the necessary meanings from the collected measurements. In this study, EMFY-3 launch experiments are used to model muzzle voltage characteristics to understand the transition mechanism better. These experiments have muzzle energies in the range between 1.69-2.85 MJ in ASELSAN Electromagnetic Launcher Laboratory. Six different launch tests with various rail current waveforms that ranged between 1.5-2.1 MA are used to investigate different scenarios. Some parameters which affect muzzle voltage are calculated with the 3-D Finite Element Method (FEM), i.e., rail mutual inductance $\mathrm{L_m}$. Muzzle voltages are decomposed into subsections; each subsection is calculated with proper models. Simulation results are coherent with experimental measurements. Findings are compared with previous studies, and differences are explained with possible reasons. Even though we could not conclusively resolve which physical quantity starts to transition, the study showed that transition does not form a specific muzzle velocity, armature action integral, or down-slope rail current ratio.

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“…The proposed model is compared with two EMFY-1 experiments, with stored electrical energies of 750 and 625 kJ. The schematic and parameters of PPS which is used in these experiments can be found in [19]. The simulations and experiment rail current waveforms comparison for EMFY-1 launcher is given in Figs.…”

Section: A Emfy-1 Experimentsmentioning

confidence: 99%

A Hybrid Simulation Model for Electromagnetic Launchers Including the Transient Inductance and Electromotive Force

Tosun

Polat

Ceylan

et al. 2020

IEEE Trans. Plasma Sci.

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Although electromagnetic launchers (EMLs) are superior to classical gun-powder-based launchers, they have to withstand extreme electrical and mechanical conditions. Therefore, the optimal design and precise simulations of these devices are crucial. In this article, a new simulation strategy for EMLs is proposed in order to achieve high accuracy and reduced complexity. The inductance and electromotive force (EMF) variations in the transient, which have a considerable influence on the launch process, are modeled using the finite element method (FEM) coupled with electrical circuit simulation. The proposed method has a good agreement with the experimental results of two EMLs (EMFY-1 and EMFY-2), which have 25-and 50-mm square bores and 3-m-length launchers. The study showed that the hybrid model with transient inductance and EMF calculations showed a good agreement with experiments that have 625 kJ-3.241-MJ input energies.

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Aselsan EMFY-1 Electromagnetic launcher: First experiments

Cited by 9 publications

References 0 publications

Inductance Gradient Calculations of EMFY-3 Electromagnetic Launcher

Inductance Gradient Calculations of EMFY-3 Electromagnetic Launcher

Muzzle Voltage Characteristics of Railguns

A Hybrid Simulation Model for Electromagnetic Launchers Including the Transient Inductance and Electromotive Force

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