In this article, we present a railgun with a combination of narrowed rails and concave armature that is more efficient compared with a standard electromagnetic launcher with rectangular rails and a monolithic “C” armature. Electromagnetic–mechanical coupled analysis of LS-DYNA is used to simulate the dynamic field distribution. The performance of the newly designed railgun is evaluated with respect to the conventional railgun of comparable dimensions and the same input energy. A pulse-forming network with realistic cable resistances is modeled to input a pulse current with a peak value of 146 kA to the conventional and newly designed railgun systems. Compared with the conventional electromagnetic railgun (EMRG), the proposed railgun results in 34% larger Lorentz force, 26% greater exit velocity, higher inductance gradient toward muzzle end, and, hence, improved barrel and system efficiency. The system efficiency of the designed railgun is 2.9% compared with 1.6% in conventional railgun. Thus, the configuration of tapered rails and concave armature can provide higher velocity to heavier loads. Also, the projectile can withstand heavier forces that are seen inside the barrel.

中文翻译：

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一种具有改进系统和炮管效率的新型电磁发射器配置

在本文中，我们展示了一种轨道炮，它结合了窄轨和凹面电枢，与具有矩形轨道和整体“C”电枢的标准电磁发射器相比，效率更高。LS-DYNA 的电磁-机械耦合分析用于模拟动态场分布。新设计的轨道炮的性能是相对于具有可比尺寸和相同输入能量的传统轨道炮进行评估的。对具有真实电缆电阻的脉冲形成网络进行建模，以将峰值为 146 kA 的脉冲电流输入到传统和新设计的轨道炮系统中。与传统的电磁轨道炮 (EMRG) 相比，所提出的轨道炮的洛伦兹力增加了 34%，出口速度增加了 26%，朝向枪口末端的电感梯度更高，并且，因此，提高了枪管和系统效率。设计的轨道炮的系统效率为 2.9%，而传统轨道炮的系统效率为 1.6%。因此，锥形导轨和凹形电枢的配置可以为较重的负载提供更高的速度。此外，射弹可以承受在枪管内看到的更重的力。