Abstract：The current flowing in rail is transferred from armature to the arc device or the arc suppression device at the moment electromagnetic (EM) launch projectile leaves from the chamber, which may cause a rapid change of muzzle magnetic field. Aiming at the special arc phenomenon when EM launch projectile leaves the chamber, firstly, a Cassie model was used to analyze the process of arc transference and obtain the current in arc device. Secondly, the magnetic field simulation model during the arcing was obtained by establishing a three-dimensional transient magnetic field simulation model of circuits of guide rail and arc. Finally, the velocity of arc root was measured by the principle of binocular vision and was converted into a velocity correction term of muzzle magnetic field. Therefore, the muzzle magnetic field simulation model considering arc motion was obtained. On this basis, the distribution of magnetic field in the projectile when it leaves the chamber was simulated. The simulation results show that the amplitude of muzzle magnetic field is lower than that of in-bore magnetic field, but the change rate of muzzle magnetic field is greater than that of in-bore magnetic field, with a peak value of 8 518T/s. The paper can provide a reference for the layout and design of onboard devices in EM launch guided projectile.
李湘平, 鲁军勇, 张晓, 冯军红, 蔡喜元. 电磁发射弹丸膛口磁场分布特性分析[J]. 电工技术学报, 2021, 36(3): 525-531.
Li Xiangping, Lu Junyong, Zhang Xiao, Feng Junhong, Cai Xiyuan. Analysis of Distribution Characteristics of Electromagnetic Launcher Projectile Muzzle Magnetic Field. Transactions of China Electrotechnical Society, 2021, 36(3): 525-531.
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2021, Vol. 36 
