电枢运动状态下轨道炮膛内磁场仿真分析

摘要

通过对三维轨道炮模型进行有限元分析求得电枢所受电磁力，进而得到电枢运动速度和位移。以离散时间步长仿真得到不同时刻电枢位于不同位置时的考察点磁场强度。结果表明，膛内磁场变化同激励电流变化整体一致，但是磁场峰值时刻滞后于电流峰值时刻，在下降阶段磁场出现局部波动。磁场频率集中于低频段，整体呈下降趋势。%Railgun model was established and analyzed by using 3 D finite element method of electromagnetic field.The electromagnetic force on armature was obtained and then the armature’s velocity and displacement were derived.Considering different locations of the armature at different times,the magnetic field of investigated points were accomplished in discrete time steps.The results indicate that the change of in-bore magnetic field is in consistent with the change of excitation current approximately,but the magnetic field peak time lags behind the current peak time.And the magnetic field appears local fluctuations.The frequency of magnetic field is concentrated in the low frequency band and the overall trend is downward.