Cannon-caliber electromagnetic launcher

Zielinski, A.E.; Werst, M.D.

doi:10.1109/20.560087

Cited by 28 publications

(7 citation statements)

References 6 publications

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“…5 The bore is rectangular,having dimensions of 17 £ 40 mm. It is a 2.25-m-longrailgun that incorporates a conducting loop which traverses the length of the launcher.…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic and Aeromechanical Analysis of Sabot Discard for Railgun Projectiles

Zielinski

Weinacht

Bennett

2000

Journal of Spacecraft and Rockets

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Experimental and engineering modeling techniques were applied to examine the role that electromagnetics plays during the sabot discard process in a solid-armature railgun. Current and magnetic eld diffusion in the conducting armature and sabot produce residual forces that tend to clamp the sabot petals during in-bore acceleration and after launch. The effect of this force on sabot discard was investigated. The experimental portion of this work used the measured downrange magnetic elds to quantify the effect on subprojectile performance. The time rate of change of launcher and switch currents and launcher voltages were measured. In addition, the time rate of change of the armature magnetic eld was measured downrange from the launcher. Electrical parameters that characterize the magnetic elds were used to calculate the residual current owing in the armature after exit. An engineering model that includes both aeromechanicaland electromagnetic forces was developed to predict the sabot discard process. The model for the magnetic clamping force used the inferred current from the magnetic elds measured downrange. The results from the sabot discard analysis are in good agreement with the measured sabot trajectory data, particularly when the sabot petals are in close proximity. The analysis shows that the aerodynamic moment acting on the sabot is relatively small following launch, and small magnetic clamping forces could delay sabot separation. NomenclatureA pocket = horizontal area of sabot petal pocket a, b = downrange and transverse current loop dimensions, respectively C m a = slope of the pitching moment coef cient with angle of attack d = downrange distance from muzzle dl 0 = incremental arc-length vector along current loop F aero = sabot petal lifting force F EM = electromagnetic clamping force F pocket = sabot petal pocket force F x-react = sabot petal reaction force in horizontal direction F z-react = sabot petal reaction force in vertical direction H = magnetic eld vector H x = downrange component of magnetic eld H y = orthogonal component of magnetic eld I = local inferred loop current in armature I o = average inferred loop current at muzzle exit I t = projectile transverse moment of inertia l aero = moment arm of sabot petal lifting force l EM = moment arm of electromagnetic clamping force l pocket = moment arm of sabot petal pocket force M 1 = freestream Mach number m = projectile mass P t2= stagnation pressure behind normal shock wave P 2 = static pressure behind normal shock wave P 1 = freestream static pressure p = separation distance between current loops in adjacent sabot petals r = local position vector r 0 = position vector along current loop S = planform area of sabot petal

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“…5 The bore is rectangular,having dimensions of 17 £ 40 mm. It is a 2.25-m-longrailgun that incorporates a conducting loop which traverses the length of the launcher.…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic and Aeromechanical Analysis of Sabot Discard for Railgun Projectiles

Zielinski

Weinacht

Bennett

2000

Journal of Spacecraft and Rockets

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“…It uses electromagnetic field pressure (J X B forces or Lorentz force) created by current flow in a pair of parallel rails to accelerate projectile-which is in sliding contact between the two [6,7]. Keeping this in view, development of Electromagnetic Launcher was initiated across the globe, some of them in research point of view, some on launching micro satellite and some on military applications [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Design and Development of High Current Pulse Shaping Inductor Based on Bitter Magnet Configuration for Electro Magnetic Launcher

Kumar*,

Jadhav,

Kumar

et al. 2019

IJEAT

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A unique pulse shaping inductor was designed and developed using a modified Bitter magnet configuration, to operate at peak current of 150 kA for duration of 5-10 ms in a Pulse Forming Network (PFN). The inductor was designed with a stack of parallel copper plates in the form of circular discs with a central hole, with GRP insulation plates in between. The design is optimized by electromagnetic finite element techniques for inductance and structural stability. The conducting discs and insulators are clamped together with tie rods between two endplates to provide adequate contact pressure and sufficient mechanical support. The conducting, inter connecting and insulating components were modeled and optimised parametrically for the desired performance and structural integrity. The device was fabricated, assembled and tested with 24 bitter plates for 28 µH inductance. The inductor was integrated with 400 kJ capacitor bank module and tested under static and dynamic condition. Current pulse of peak above 100 kA was generated, with consistent arc-free performance, high reliability and structural stability.

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“…There is also a potential shortcoming of weight. The Cannon-Caliber Electromagnetic Gun (CCEMG) [3] is shown in Figure 3. A flatjack is used as a prestress mechanism that keeps the rails and gun bore intact during the launch of a projectile.…”

Section: Introductionmentioning

confidence: 99%

Structural mechanics for electromagnetic railguns

Tzeng

2005

IEEE Trans. Magn.

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The objective of this investigation is to explore potential designs and appropriate materials for a lightweight fieldable electromagnetic rail gun. Lessons learned from the previous launcher designs are reviewed and discussed from a mechanics point of view. Analyses are performed with a conceptually workable gun bore to illustrate the requirement of a fieldable gun construction. Both static and dynamic responses of the rail gun are discussed. The study provides a fundamental understanding for developing a fieldable rail gun in terms of mechanics and material requirement.

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Cannon-caliber electromagnetic launcher

Cited by 28 publications

References 6 publications

Electromagnetic and Aeromechanical Analysis of Sabot Discard for Railgun Projectiles

Electromagnetic and Aeromechanical Analysis of Sabot Discard for Railgun Projectiles

Design and Development of High Current Pulse Shaping Inductor Based on Bitter Magnet Configuration for Electro Magnetic Launcher

Structural mechanics for electromagnetic railguns

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