Electromagnetic field measurements near a railgun

Coburn, William O.; Le, Calvin; DeTroye, David J.; Blair, G.E.; Williams, W. Larry

doi:10.1109/20.364608

Cited by 16 publications

(1 citation statement)

References 5 publications

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“…Cobum et al [6] experimentally measured the magnetic and electric fields near the investigation point of the device. Wang et al [7] used the self-developed Railgun3D program to simulate the electromagnetic field evolution process of the electromagnetic launcher based on the moving window method.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Characteristics Analysis of Quadrupole Compound Orbital Electromagnetic Launcher with Different Configurations

Zhang

Shu

2022

Electronics

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During the operation of the Quadrupole Compound Orbital electromagnetic launcher, the current is easy to gather in the armature and the rail contact surface. Serious turn and arc ablation can occur, causing damage to the rail and the armature and affecting the life of the launcher. To better solve the thermal ablation problem of the armature and the rail, three different configurations of the rail and the armature are established, and the current density, magnetic field distribution and electromagnetic force of the rail and the armature are compared and analyzed using the finite element method, and the effect of concave and convex values of the armature rail on current distribution and electromagnetic force is discussed. The results show that the planar armature can effectively reduce the maximum current density and mitigate thermal damage. The concave elliptical rail produces the largest electromagnetic thrust and the smallest radial electromagnetic force, and the armature is more stable during firing. The maximum current density and magnetic field strength are negatively correlated with the concave and convex values; the electromagnetic thrust applied to the concave elliptical armature is negatively correlated with the concave value, while the electromagnetic force applied to the convex elliptical armature is positively correlated with the convex value.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Characteristics Analysis of Quadrupole Compound Orbital Electromagnetic Launcher with Different Configurations

Zhang

Shu

2022

Electronics

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Static and quasi-static models for the magnetic field of a railgun

Coburn

1995

IEEE Trans. Magn.

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A solution for the three dimensional rail gun current distribution and electromagnetic fields of a rail launcher

Kohlberg¹,

Coburn

1995

IEEE Trans. Magn.

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A bstruct-Rail guns generate electromagnetic signatures that contain frequencies extending from quasi-dc to tens of kHz.The c h a r a c t e r i z a t i o n of these fields for electromagnetic compatability concerns remains, however, largely unexplored. Accordingly, this paper includes a discussion of the theoretical models used to predict the inductance gradient, the transient behavior of the currents produced in the rail gun structure, the dynamical generation of the external fields, and a comparison of the theoretical model with experimental data.The predicted rail inductance gradient of LL = 0.52 p H / m compares very well with the measured value of 0.522 p H / m . The existence of an inductance gradient efficiency factor, E,,, is demonstrated, with a derived value of 0.75. This produces an effective inductance gradient of L' = E ,,LL = 0.39 p H / m which leads to a predicted muzzle velocity of 525 m/s that is within 5% of the measured value.Predicted magnetic field waveshapes a r e in good agreement with observations close to the bore center.For radial distances greater than a foot, measured peak fields exceed predictions by a factor of two to three. This issue is being investigated. a limited comparison with experimental data. Companion paprs by Cobum et al. [1]-[2] address the observations and experimental configuration in detail.The incorporation of a rail gun into a weapon system requires a quantification of the relationship between the power source, rail gun dynamics, and electromagnetic fields generated by the rail and armature currents. In order to ensure EMC with other equipment, it is necessary to not only characterize the dominant low-frequency (dc to tens of kHz) fields generated by the moving armature, but also the higher frequency emissions generated by continuum arcing along the rails, and the larger arc produced at the muzzle.For predicting the low-frequency magnetic fields it appears that the circuit approximation to the rails, which has traditionally been used to study armature acceleration, is probably adequate. On the other hand, a modal analysis of the rail system model viewed as a transmission line is required at higher frequencies in order to model arcing contributions. In addition, it may be necessary to incorporate the effects of electromagnetic shielding in the evaluation of EMC for an actual system. This paper is the first in a series of reports that eventually will quantify EMC considerations for all frequencies of interest. We concentrate at present only on the low-frequency fields generated by the rail current in a solid mature, for which there is negligible arcing. CONCEPTUAL ISSUES AND OVERVIEW

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Electromagnetic field measurements near a railgun

Cited by 16 publications

References 5 publications

Electromagnetic Characteristics Analysis of Quadrupole Compound Orbital Electromagnetic Launcher with Different Configurations

Electromagnetic Characteristics Analysis of Quadrupole Compound Orbital Electromagnetic Launcher with Different Configurations

Static and quasi-static models for the magnetic field of a railgun

A solution for the three dimensional rail gun current distribution and electromagnetic fields of a rail launcher

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