Design And Experimental Analysis Of Magnetic Shielding Of Electronic-Magnetic Rail Gun Ammunition Fuse

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS(2017)

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摘要
During a launch with an electromagnetic railgun its payload is subjected to both extreme mechanical stresses and strong electromagnetic interference. Therefore, the design of electronic parts of the payload, such as a fuse of an ammunition, poses technical challenges. This paper focuses on the magnetic shielding technique of intelligent ammunition fuses. After considering the magnetic field distribution including the velocity skin effect, a surface model of a railgun was built. Double exponential pulses similar to capacitor discharges were used as power supply. Spatial distribution regularities and frequency spectrum characteristics of pulsed strong magnetic field in the chamber of the rail gun were analyzed. Based on these results a simulation and an experimental analysis of the shielding effectiveness of a strong magnetic field environment designed for a railgun payload was conducted. The shielding effectiveness of different shield materials, located at different distances in front of the armature and at different positions inside the shield. The results indicated the feasibility of effectively shielding the strong magnetic field in the chamber of a railgun during the launch. These findings can serve as a reference for future railgun intelligent ammunition shielding designs.
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关键词
The electronic-magnetic rail gun, ammunition fuse, magnetic shielding technique
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