The electromagnetic launch system model provides a useful reference for the launch process and performance. Inductance gradient and resistance gradient of the rail, which reflect the equivalent load characteristics of the launcher, are related to shape, material of the rail, and other factors, making it difficult to characterize in the circuit model. Therefore, a method combining equivalent network with finite element analysis is proposed to solve this problem. A segmentation-based real-time trigger strategy is applied to the 4 MJ pulse power supply (PPS) system consisted of 28 modules to shoot the 0.15 kg armature on a 6 m long rail. The width, height of the rail, or separation between two rails increase individually from 20 to 180 mm. After computing the resistance and inductance gradients of the specific rail in ANSYS, the rapid system-level simulation is carried out in MATLAB-Simulink to deliver the railgun’s performance. The results show that both the resistance gradient and the inductance gradient contribute to the launch efficiency. In order to obtain a larger inductance gradient, the width of the two rails should be narrower, the height should be shorter, and the separation between the two rails should be farther. Nevertheless, in the perspective of decreasing resistance gradient, the rail should be wider, taller, and farther. Although the resistance gradient increases with the decrease of height and width, the promotion in the inductance gradient has much more significant impacts on the electromagnetic force under the same geometric change. Therefore, for the sake of a higher launching efficiency, the rails should be narrower, shorter, and farther.

中文翻译：

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几何参数对矩形孔道轨道炮的等效载荷和效率的影响

电磁发射系统模型为发射过程和性能提供了有用的参考。反映发射器等效负载特性的铁轨的电感梯度和电阻梯度与铁轨的形状，材料和其他因素相关，因此很难在电路模型中进行表征。因此，提出了一种将等效网络与有限元分析相结合的方法来解决该问题。基于分段的实时触发策略被应用于由28个模块组成的4 MJ脉冲电源（PPS）系统，以在6 m长的轨道上射出0.15 kg电枢。导轨的宽度，高度或两个导轨之间的间距分别从20毫米增加到180毫米。在ANSYS中计算特定轨的电阻和电感梯度之后，在MATLAB-Simulink中进行了快速的系统级仿真，以提供轨道炮的性能。结果表明，电阻梯度和电感梯度均对发射效率有贡献。为了获得更大的电感梯度，两个导轨的宽度应该更窄，高度应该更短，并且两个导轨之间的间距应该更远。但是，从减小电阻梯度的角度来看，导轨应更宽，更高和更远。尽管电阻梯度随高度和宽度的减小而增加，但是在相同的几何变化下，电感梯度的提升对电磁力的影响要大得多。因此，为了提高发射效率，轨道应更窄，更短和更远。