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。%To study the lateral electromagnetic force on the oblique shaped charge jet in the passive elec-tromagnetic armor under the pulse current,the geometric model that shaped metal jet penetrates armor plates obliquely is established,and the transformation relationship between local coordinate and space co-ordinate of armor plates is established.The current filament equation of armor plates is obtained under lo-cal coordinate system based on current filament method,and then the computational model of magnetic induction and the transient stress model of metal jet are established by Biot-Savart’s law.Using Matlab to calculate magnetic induction and lateral electromagnetic force,the results show that it is in good agree-ment with Appelgren’s experiment results that the lateral electromagnetic force on vertical shaped charge jet varies with time and location;the lateral electromagnetic force on oblique shaped charge jet mainly comes from the current of the armor plate that has an acute angle with jet along the direction of the cur-rent;the direction of force is perpendicular to jet,and the state of force is spiral.
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