Analysis of In-bore Magnetic Field in Electromagnetic Railgun Considering the Realistic Armature-rail Contact Status

doi:10.3969/j.issn.1000-1093.2019.03.003

Abstract

Abstract: The distribution characteristics of railgun in-bore magnetic field under the realistic armature-rail contact status is studied. For a small caliber C-shaped armature railgun, the numerical calculation and finite element simulation are used to analyze the magnetic flux density of the investigated points along the central axes of armature front endbased on the armature current density distribution produced by the actual contact of armature-rail under static state. The analyzed results are in good agreement with the experimental values. On this basis, the distribution characteristics of in-bore magnetic field under motion state are analyzed by using the scaling method. The results show that the approximate scaling of armature velocities and magnetic fields of different caliber railguns can be realized on the basis of satisfying certain scaling relations. The peak magnetic flux density of each investigated point decreases rapidly with the increase in the distance from point to armature, and the magnetic flux density of the investigated point at the distance of two calibers from the armature curvature center is about 27.4% of that of the point at the one caliber distance. The results are helpful to the electromagnetic shielding design of intelligent ammunition. Key

Key words: electromagneticrailgun, armature-railcontact, magneticfluxdensity, scalingmethod

CLC Number:

YIN Qiang， ZHANG He， LI Haojie， YANG Yuxin. Analysis of In-bore Magnetic Field in Electromagnetic Railgun Considering the Realistic Armature-rail Contact Status[J]. Acta Armamentarii, 2019, 40(3): 464-472.

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第40卷第3期2019 年3月兵工学报ACTA
ARMAMENTARIIVol.40No.3Mar.2019

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