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A solution for the three dimensional rail gun current distribution and electromagnetic fields of a rail launcher

机译：轨道发射器三维轨道枪电流分布和电磁场的解决方案

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摘要

Rail guns generate electromagnetic signatures that contain frequencies extending from quasi-DC to tens of kHz. The characterization of these fields for electromagnetic compatibility concerns remain, however, largely unexplored. Accordingly, this paper includes a discussion of the theoretical models used to predict the inductance gradient, the transient behavior of the currents produced in the rail gun structure, the dynamical generation of the external fields, and a comparison of the theoretical model with experimental data. The predicted rail inductance gradient of L'/sub R/=0.52 /spl mu/H/m compares very well with the measured value of 0.522 /spl mu/H/m. The existence of an inductance gradient efficiency factor, E/sub o/, is demonstrated, with a derived value of 0.75. This produces an effective inductance gradient of L'=E/sub o/L'/sub R/=0.39 /spl mu/H/m which leads to a predicted muzzle velocity of 525 m/s that is within 5% of the measured value. Predicted magnetic field waveshapes are in good agreement with observations close to the bore center. For radial distances greater than a foot, measured peak fields exceed predictions by a factor of two to three. This issue is being investigated.
机译：轨道炮会产生电磁信号，其中包含从准DC到数十kHz的频率。这些领域的电磁兼容性问题仍然没有得到充分的研究。因此，本文讨论了用于预测电感梯度的理论模型，在轨道炮结构中产生的电流的瞬态行为，外部场的动态生成以及理论模型与实验数据的比较。 L'/ sub R / = 0.52 / spl mu / H / m的预测轨电感梯度与测量值0.522 / spl mu / H / m很好地比较。演示了电感梯度效率因子E / sub o /的存在，其导出值为0.75。这会产生一个有效的电感梯度L'= E / sub o / L'/ sub R / = 0.39 / spl mu / H / m，从而导致预计的炮口速度为525 m / s，处于测得值的5％之内值。预测的磁场波形与靠近孔中心的观测结果非常吻合。对于大于一英尺的径向距离，测得的峰值场超出预测值的二到三倍。此问题正在调查中。

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