Design and improvement of a pulse shaping inductor for a pulsed power system

Civil, Anil; Cavbozar, O.; Karagoz, Mustafa; Tan, Evren; Cevik, Yasin

doi:10.1109/ppc.2017.8291281

“…γ, and ζ are not calculated analytically, they extracted through muzzle voltage values considering (2). γ is equal to 10, and ζ is equal to 0.9 10 −3 give consistent results with experimental findings.…”

Section: Resultssupporting

confidence: 64%

Muzzle Voltage Characteristics of Railguns

Tosun¹,

Keysan²

2021

Preprint

0

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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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“…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]. ζ is the friction damping factor, and F C is the contact force.…”

Section: Sensitivity Analysismentioning

confidence: 99%

Inductance Gradient Calculations of EMFY-3 Electromagnetic Launcher

Tosun¹,

Keysan²

2021

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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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“…3. Then (1) can be arranged as (2), where I r is the rail current, and R c is the armature resistance in addition to contact resistance. This sum is denoted as R c throughout the paper for the sake of simplicity.…”

Section: Literature Surveymentioning

confidence: 99%

Muzzle Voltage Characteristics of Railguns

Tosun¹,

Keysan²

2021

Preprint

0

View full text Add to dashboard Cite

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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Design and improvement of a pulse shaping inductor for a pulsed power system

Cited by 11 publications

References 1 publication

Muzzle Voltage Characteristics of Railguns

Muzzle Voltage Characteristics of Railguns

Inductance Gradient Calculations of EMFY-3 Electromagnetic Launcher

Muzzle Voltage Characteristics of Railguns

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