Electromagnetic coaxial railgun

Schaaf, J.C.; Audeh, N.F.

doi:10.1109/20.42272

Cited by 8 publications

(2 citation statements)

References 1 publication

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“…From then to now, many studies have been conducted on EML: unmanned aerial vehicle [11], trap countermeasure [12], [13], mortar [14], low-middle speed rocket launcher [15], highspeed launcher (long-range weapons [16]), and hyperspeed launcher (space assistant systems [17]- [19], pulse physics [20], [21], and shock and vibration tester [22], [23]) are the EML applications studied in the literature. Despite these long-term studies, only a few parameters have been developed for evaluating EML geometries [24] and characterizing the performance of a launcher.…”

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confidence: 99%

A New Electromagnetic Helical Coilgun Launcher Design Based on LabVIEW

Ege

Kabadayı

Kalender

et al. 2016

IEEE Trans. Plasma Sci.

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In this paper, a new helical coil electromagnetic launcher is designed, which launches a magnet projectile without using any mechanical launching equipment, but by applying momentary varying current to the helical coil. For measuring the velocity of the magnet projectile in different stages, a LabVIEWbased software and hardware system is developed, and it is also used for improving the performance of the output velocity of the magnet projectile by changing the ignition time of the coils. This paper distinguished the new accelerator coil design and the software, which uses LabVIEW for the first time in this area. With the LabVIEW-based software, optical sensor data are acquired and processed, and ignition triggering control is carried out. Ignition timings on sequential four helical coils are optimized to produce the maximum acceleration in each coil, and thus the maximum velocity of the magnet projectile at output. An NI Data Acquisition 6010 data acquisition card is used for communication and gathering information throughout the entire launching process. In addition, the effects of changing the current magnitude, ignition time, magnet projectile length, and diameter to the output velocity of magnet projectile are investigated and discussed in detail.

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confidence: 99%

A New Electromagnetic Helical Coilgun Launcher Design Based on LabVIEW

Ege

Kabadayı

Kalender

et al. 2016

IEEE Trans. Plasma Sci.

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“…Coaxial railguns are not practical for weaponized applications because of the limitation of the projectile design. However, they seem applicable as possible orbiting launchers for interplanetary mission probes [25].…”

Section: Types Of Railgunsmentioning

confidence: 99%

Improvement of Electromagnetic Railgun Barrel Performance and Lifetime by Method of Interfaces and Augmented Projectiles

Павлов¹

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The graphite coating was found to measurably reduce the forces of friction inside the bore but was so thin that it did not improve contact. The added contact resistance of the graphite was measured and gauged to not be problematic on larger scale railguns. The liquid metal was found to greatly improve contact and not introduce extra resistance but its hazardous nature and tremendous cost detracted from its usability.The simulated resistivity augmented projectiles were able to mitigate harmful current build-up on the back of a projectile using different conductivity gradients.Within the range of conductivity of aluminum alloys no simulated gradient was able to fully level the current density, however, once the range was expanded to include the lower conductivity of titanium, nearly uniform current density was achieved.iv

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A general theory of DC electromagnetic launchers

Engel

Timpson

2015

Journal of Applied Physics

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The non-linear, transient operation of DC electromagnetic launchers (EMLs) complicates their theoretical understanding and prevents scaling studies and performance comparisons without the aid of detailed numerical models. This paper presents a general theory for DC electromagnetic launchers that has simplified these tasks by identifying critical EML parameters and relationships affecting the EML's voltage, current, and power scaling, as well as its performance and energy conversion efficiency. EML parameters and relationships discussed in this paper include the specific force, the operating mode, the launcher constant, the launcher characteristic velocity, the contact characteristic velocity, the energy conversion efficiency, and the kinetic power and voltage-current scaling relationship. The concepts of the ideal EML, same-scale comparisons, and EML impedance are discussed. This paper defines conditions needed for the EML to operate in the steady-state. A comparison of the general theory with experimental results of several different types of DC (i.e., non-induction) electromagnetic launchers ranging from medium velocity (100's m/s) to high velocity (1000's m/s) is performed. There is good agreement between the general theory and the experimental results.

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Electromagnetic coaxial railgun

Cited by 8 publications

References 1 publication

A New Electromagnetic Helical Coilgun Launcher Design Based on LabVIEW

A New Electromagnetic Helical Coilgun Launcher Design Based on LabVIEW

Improvement of Electromagnetic Railgun Barrel Performance and Lifetime by Method of Interfaces and Augmented Projectiles

A general theory of DC electromagnetic launchers

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