Advances in Electromagnetic Launch Science and Technology and Its Applications

Fair, H.D.

doi:10.1109/tmag.2008.2008612

Cited by 122 publications

(21 citation statements)

References 24 publications

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“…Radius of projectile 10 mm R 2 Inside radius of tube 11 mm R 3 Outside radius of tube 12 mm R 4 Outside radius of bracket 70 mm R 5 Outside radius of winding coil 29 mm L 1 Length of magnetic projectile 7.5 mm L 2 Longitudinal length of coil winding 36 mm L 3 Gap between the coils 3 mm projectile passes the center between the first half-coil and the second half-coil, the circuit to the first capacitor is shut off and the circuit to the second capacitor connected to the second half-coil and third half-coil is turned on. In this way, the length of the proposed coil gun EML system is 1/2(N+1)L, which is much shorter than the length of a conventional design.…”

Section: Rmentioning

confidence: 99%

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Coil Gun Electromagnetic Launcher (EML) System with Multi-stage Electromagnetic Coils

Lee¹,

Kim²,

Song³

et al. 2013

Journal of Magnetics

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An electromagnetic launcher (EML) system accelerates and launches a projectile by converting electric energy into kinetic energy. There are two types of EML systems under development: the rail gun and the coil gun. A railgun comprises a pair of parallel conducting rails, along which a sliding armature is accelerated by the electromagnetic effects of a current that flows down one rail, into the armature and then back along the other rail, but the high mechanical friction between the projectile and the rail can damage the projectile. A coil gun launches the projectile by the attractive magnetic force of the electromagnetic coil. A higher projectile muzzle velocity needs multiple stages of electromagnetic coils, which makes the coil gun EML system longer. As a result, the installation cost of a coil gun EML system is very high due to the large installation site needed for the EML. We present a coil gun EML system that has a new structure and arrangement for multiple electromagnetic coils to reduce the length of the system. A mathematical model of the proposed coil gun EML system is developed in order to calculate the magnetic field and forces, and to simulate the muzzle velocity of a projectile by driving and switching the electric current into multiple stages of electromagnetic coils. Using the proposed design, the length of the coil gun EML system is shortened by 31% compared with a conventional coil gun system while satisfying a target projectile muzzle velocity of over 100 m/s.

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Section: Rmentioning

confidence: 99%

“…Massive heat is created due to the friction of the projectile leaving the device. It is possible for the rails, barrel, and all equipment attached to melt or be irreparably damaged [2,3].…”

Section: Introductionmentioning

confidence: 99%

Coil Gun Electromagnetic Launcher (EML) System with Multi-stage Electromagnetic Coils

Lee¹,

Kim²,

Song³

et al. 2013

Journal of Magnetics

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“…This capability can make a projectile destroy a target with high velocity [1]. It can be used for antiarmor air defense systems or long-range attack systems [2]- [4]. As we know [5]- [7], a 60-kg projectile can fly a distance of 400 km if it is accelerated to 2.5 km/s at a 51 ± 1°launch elevation angle.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Transient Current Distribution in Copper Strips of Different Structures for Electromagnetic Railgun

Xing¹,

Lv²,

Lei³

et al. 2015

IEEE Trans. Plasma Sci.

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A railgun is a kind of new-concept kinetic energy weapon. To overcome the local aggregation of the high pulse current on the surface of the railgun conductor, a method was introduced to abate the skin effect. On the basis of theoretical analysis, three kinds of methods were adopted to increase the current uniformity coefficient. Then, the copper strips, whose thicknesses were 40, 20, 15, and 10 mm, respectively, were simulated with a typical half-period sine waveform that had a 10-ms pulsewidth and a 2-MA peak current. The best current uniformity coefficient in the copper strips is more than 83%. Three conclusions are drawn in this paper. First, under the same conditions, the current distribution will become more uniform as the copper strips become thinner. Second, the current distribution can be improved to a certain extent by rounding strip edges. Third, the added tungsten sheaths or iron sheaths on both sides of the copper strips can further improve the current distribution. The results of this paper have great significance for improving the pulse current-carrying capability of the railgun conductors.Index Terms-Current distribution, finite-element simulation, railguns, skin effect, uniformity coefficient.

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“…Using the electromagnetic field to produce propulsive force, the launcher can overcome velocity limitations of chemical launchers. The electromagnetic launchers were classified into following major types according to their different work principle and mechanism: rail launcher, pulsed induction coil launcher, reconnection launcher, helical launcher and linear induction launcher [1]- [4].…”

Section: Introductionmentioning

confidence: 99%

Performance of a Four-section Linear Induction Coil Launcher Prototype

Li¹,

Wang²,

Wang³

et al. 2014

IEEE Trans. Appl. Supercond.

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To improve the pulse capacitor-powered linear induction electromagnetic launcher system kinetic energy conversion efficiency, and promote development in the large mass projectile, high-speed launch requirements, this paper establishes the multi-section linear induction electromagnetic launcher model. A multi-section linear induction launcher experiment platform was built and the test was carried out. According to the principles of the mesh-matrix method, a lumped parameter transient physical and numerical model for the analysis of the dynamic conditions was built. The simulation code was programmed by MATLAB for the capacitor-driven launcher. Simulating the coil launcher by the code, one can draw the three-phase voltages and currents of the drive coils and the voltages and currents rings of the projectile, temperature of the drive coils and the rings of the projectile with respect, curves of the acceleration, force, and position of the projectile. A four-section linear induction launcher experiment bench was designed and established. Pulsed capacitor bank was used as the energy stored components. Each phase has a Spark-gap switch which, when closed, connects its portion of the capacitor bank to the coils, initiating the ac oscillations. Central control system was build based on the chip of the digital signal processor TMS320F2812 and the PC was coordinated the normal operation of the system. Performance results for the linear induction launcher with four sections are summarized. The system used pulsed capacitor bank and coils to accelerate 320-g projectile intact up to a muzzle velocity of 392 m/s. This provides the foundation of the higher muzzle velocity coil launcher research in the next stage.Index Terms-Linear induction coil launcher, mesh-matrix, projectile, pulsed capacitor, spark-gap switch. 1051-8223

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Advances in Electromagnetic Launch Science and Technology and Its Applications

Cited by 122 publications

References 24 publications

Coil Gun Electromagnetic Launcher (EML) System with Multi-stage Electromagnetic Coils

Coil Gun Electromagnetic Launcher (EML) System with Multi-stage Electromagnetic Coils

Analysis of Transient Current Distribution in Copper Strips of Different Structures for Electromagnetic Railgun

Performance of a Four-section Linear Induction Coil Launcher Prototype

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