弹体磁屏蔽效应及目标运动状态对磁探测的影响

Study on magnetic shielding effect of projectile and target motion state on magnetic detection

为实现隐埋式弹药对于铁磁类目标的探测能力,对隐埋式弹药弹体的磁屏蔽特性进行仿真研究及分析。利用仿真软件对隐埋式弹体进行二维及三维建模仿真,分析了弹体材质、弹体开孔大小、弹体开孔朝向以及目标运动状态对弹体磁屏蔽特性的影响。结果表明:开孔朝向平行于外界磁场情况下,开孔处磁感应强度随开孔直径成对数增长;开孔朝向垂直于外界磁场时,开孔处磁感应强度最小,并随着夹角的变小逐渐增大,目标运动速度不影响其磁特征信号幅值。进行了运动目标与地磁场成不同角度下产生的磁特征信号的采集验证实验,获得了其变化曲线,为隐埋式弹体后续目标识别算法设计提供了参考。

In order to realize the detection ability of the buried munitions on ferromagnetic targets,the magnetic shielding characteristics of the buried munitions are simulated and analyzed.Simulation software is used to conduct two-dimensional and three-dimensional modeling and simulation for the hidden missile body,and the influence of the material of the missile body,the size of the opening hole,the orientation of the opening hole and the motion state of the target on the magnetic shielding characteristics of the missile body is analyzed.The results show that when the orientation of the opening is parallel to the external magnetic field,the magnetic induction intensity increases in pairs with the diameter of the opening hole.When the orientation of the opening is perpendicular to the external magnetic field,the magnetic induction intensity at the opening is the smallest,and gradually increases with the decrease of the included Angle,the velocity of the target does not affect the amplitude of its magnetic characteristic signal.The magnetic characteristic signals generated by the moving target and the geomagnetic field at different angles are simulated and verified by acquisition experiments.The variation curve is obtained,which provides a reference for the design of subsequent target recognition algorithm for the buried missile body.