轨道炮发射过程中电火工品的可靠性评估

Reliability Evaluation of the Electric Explosive Device During the Railgun's Launching Process

电磁轨道炮发射时会在膛内激发强脉冲磁场,从而与引信内部的电火工品产生能量耦合,影响轨道炮弹药的作用可靠性。针对轨道炮电火工品所处位置的磁场环境表征,应用有限元法对轨道炮发射全过程进行了仿真模拟,明确了弹丸引信区域磁场的时空分布特性,突出了发射组件出膛瞬间这一特殊事件所引起的极端磁场变化。然后开展了电火工品与强脉冲磁场环境的耦合效应研究,研究了电火工品壳体、桥区薄膜等实际几何特征对强脉冲磁场的衰减特性,分析了不同脚线布置方式下弹丸电火工品换能元的电热响应特征,并以该型电火工品的最小点火能量与桥区熔点为标准对其作用可靠性进行了评估。研究结果表明轨道炮发射典型参数下电火工品具有较高安全性。分析结果可为电磁轨道炮弹药引信的设计与可靠性评估提供参考。

During the launch process of the railgun,a strong pulsed magnetic field will be excited in the bore,resulting in energy coupling with the electric explosive device(EED)inside the fuze,threatening the reliability of the railgun ammunition.Firstly,regarding the characterization of the magnetic field environment around the EED,the finite element method was applied to simulate the entire firing process of the railgun,the spatiotemporal distribution characteristics of the magnetic field in the projectile fuze region are identified,and the extreme changes caused by the special event of the projectile exiting the muzzle are highlighted.An investigation is then conducted into the coupling effects between the EED and the strong pulsed magnetic field,which looks into the attenuation characteristics of the actual EED case and bridge geometries in the strong pulsed magnetic field.The electrothermal response of the transducer in the EED with different pin wire arrangements is analyzed with its reliability evaluated according to the minimum ignition energy and bridge melting point.The results show that the EED is reliable with the representative parameters of a railgun launching event.The analysis results can provide a reference for the design of electromagnetic railgun ammunition fuses.