基于地磁场的弹丸炮口转速-速度测量方法

Projectile Muzzle Rotational Speed-Velocity Measurement Method Based on the Geomagnetic Field

针对目前炮口转速的直接测量研究较少的问题,提出一种基于地磁场的新型炮口运动参数测量方法。该方法根据身管和弹丸铁磁性材料的聚磁效应及炮口地磁场的分布特征,在弹丸引信表面布设周向阵列均匀磁传感器,获取弹丸运动过程中地磁场的感应信息。对传感器运动路径上磁感应强度模值曲线进行一阶及二阶求导,得到两特征位置。利用弹丸旋转导致两位置阵列传感器周向拟合磁场表达式的相位变化,结合时间实现炮口转速的直接测量,根据转速和速度的特定函数关系可解算出炮口速度。利用有限元软件验证了方法的可行性,为实际测试系统的设计及应用提供了参考依据。

Aiming at the problem that direct measurement of muzzle rotation speed is rarely studied at present, a new measurement method of muzzle motion parameters based on the geomagnetic field is proposed. According to the magnetic concentration effect of ferromagnetic materials of artillery barrels and projectiles and the distribution characteristics of the geomagnetic field of the muzzle, the method obtains the induction information of the geomagnetic field during the projectile movement by mounting a circumferential array uniform magnetic sensor on the surface of the projectile fuse. The first-order and second-order derivation of the magnetic induction intensity modulus curve on the motion path of the sensor is carried out, and two characteristic positions are obtained. Based on the projectile rotation-induced phase change of the circumferential fitting magnetic field expression of the array sensor between the two positions and time, direct measurement of muzzle rotational speed is realized, according to the specific relationship between muzzle rotation speed and velocity, muzzle velocity can also be calculated. The feasibility of the method is verified by finite element software, which provides a reference for the design and application of actual test systems.