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为分析聚能金属射流斜侵彻被动电磁装甲时脉冲大电流对其产生的横向电磁力,建立了聚能金属射流斜侵彻装甲板的几何模型,给出了内、外装甲板上局部坐标系与空间坐标系的转换关系;运用电流丝法建立了装甲板在局部坐标系下的电流丝方程,进而根据毕奥-萨伐尔定律,建立了磁感应强度计算模型和金属射流瞬态受力模型。运用Matlab对所建模型进行了计算,结果表明:在金属射流垂直侵彻状态下,横向电磁力随时间和位置的变化情况与Appelgren的实验结果十分吻合;在金属射流斜侵彻状态下,横向电磁力主要来自于沿电流方向与射流成锐角的装甲板上的电流,电磁力方向垂直于射流且沿射流呈螺旋状改变。
In order to analyze the transverse electromagnetic force of the convergent metal jet obliquely penetrating the large electromagnetic pulse generated by the passive electromagnetic armor, a geometric model of the oblique penetration armor plate of the converging metal jet was established. The local coordinate system of the inner and outer armor plates And the space coordinate system. The current wire equation of the armor plate in the local coordinate system was established by using the current wire method. Then according to the Biot-Savart law, the magnetic induction intensity calculation model and the metal jet transient stress model . The results show that the variation of transverse electromagnetic force with time and position is in good agreement with the experimental results of Appelgren under the condition of vertical penetration of metal jet. Under the condition of oblique penetration of metal jet, Electromagnetic force mainly comes from the current on the armor plate at an acute angle to the jet in the direction of the current. The direction of the electromagnetic force is perpendicular to the jet and changes helically along the jet.