四轨电磁发射器的背场增强仿真分析

针对四轨电磁发射器的背场增强方案的电感梯度进行了仿真分析。根据虚功原理，推导了背场下的四轨电磁发射器电感梯度公式。建立了三维背场仿真模型，分析了不同主、附轨道参数下电感梯度的变化规律。仿真结果表明：添加背场后，增大发射器口径、减小主附轨间距和附轨道截面积均能够实现系统电感梯度的提升；背场增强下，在主轨道高度达到口径的57%时，邻近效应已变得明显；相同附轨道截面积下，为增大系统电感梯度应优先减小附轨道厚度，为缓解电流邻近效应可优先减小附轨道高度；凹形截面附轨道能够明显改善电流邻近效应。

Simulation analysis of background field enhancement of four-rail electromagnetic launcher

The inductance gradient of the background field enhancement scheme of the four-rail electromagnetic launcher is simulated. Based on the principle of virtual work, the formula of the inductance gradient of the four-rail launchers under the background field is derived. A three-dimensional background field simulation model is established to analyze the variation law of inductance gradient under different main and additional rail parameters. The simulation results show that the inductance gradient of the system can be improved by increasing the launcher caliber, reducing the distance between the main and additional rails and the cross-sectional area of the additional rails. With the enhancement of background field, the proximity effect becomes obvious when the height of main rail reaches 57% of the caliber. Under the same cross-sectional area, the thickness of the additional rails should be reduced to increase the inductance gradient of the system, and the height of the additional rails should be reduced to alleviate the proximity effect. Concave cross-section additional rail can obviously improve the current proximity effect.