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为分析电枢高速运动在轨道炮周围产生的时变磁场特性,采用以一定速度伸长的两根线电流来表征电枢运动带来的轨道电流路径长度的变化,利用毕奥–萨伐定律计算电枢不同运动速度下在空间产生的磁场,然后对磁场波形进行频谱分析。揭示了电枢速度产生时变磁场的机理及其特性,给出了时变磁场频谱主瓣宽度与速度的定量关系以及简化计算式,利用该式可以方便地计算出不同运动速度的电枢在不同空间点上产生的时变磁场的频谱主瓣宽度。在场点距两轨道中心线的距离为h且为轨道宽度、电枢速度为v时,则时变磁场的频谱主瓣宽度约为v/(2.8h)。随着场点远离轨道,频谱主瓣宽度会下降,即场的高频分量会减小。
In order to analyze the time-varying magnetic field generated around the rail gun during high-speed armature movement, two linear currents extending at a certain speed are used to characterize the change of the path length of the rail current caused by the armature movement. By using the Biot-Savart law Calculate the magnetic field generated in space under different moving speed of armature, and then conduct the spectrum analysis of the magnetic field waveform. The mechanism and characteristics of the time-varying magnetic field with armature speed are revealed. The quantitative relationship between the main lobe width and the velocity of the time-varying magnetic field spectrum and the simplified formula are given. Armature can be easily calculated by using this formula The main lobe width of the spectrum of time-varying magnetic fields generated at different points in space. When the distance of the spot from the center line of the two tracks is h and the track width and the armature speed is v, the main lobe width of the spectrum of the time-varying magnetic field is about v / (2.8h). As the field points away from the orbit, the width of the main lobe of the spectrum will decrease, and the high frequency components of the field will decrease.