Research On Magnetic Perception And Identification Technology Of Penetration Angle

In modern warfare,in order to accurately destroy the enemy’s important military equipments buried deep under reinforced concretes,steel armors and other fastened defense facilities,the penetration projectile needs to have the ability to penetrate hard targets.When the penetrator attacks the target,it is not only affected by the longitudinal resistance,which changes its velocity,but also by the lateral resistance,which makes the projectile deflect,resulting in oblique penetration when the penetration projectile attacks the target.In the oblique penetration,if the penetration angle is too large,the penetration projectile may become unstable in the process of penetration,and in serious cases,the phenomenon of ricochet may occur,which makes the penetration ability decrease and fails to achieve the effect of attacking the target.That is,the measurement of the penetration angle is particularly important,the common measurement means are high-speed photography method,measuring the position of the bullet hole method,etc.,which are "external method" can not achieve the bullet on the independent real-time access to the changes in the penetration angle during oblique penetration.This thesis proposes a method for the magnetic perception of the penetration angle to address this problem and conducts the following research work.1.Because military hard targets generally have ferromagnetic properties,it is proposed to establish a rotating symmetrical magnetic field inside the penetration fuze,and the magnetic field on the internal axis of the fuze will change when the penetration projectile is oblique,resulting in a magnetic deflection angle,and its change pattern during oblique penetration is studied.2.According to the proposed measurement method,the mathematical model of spatial magnetic field distribution in the fuze is established,the intrusion model is established by using the finite element software ANSYS,the oblique intrusion simulation calculation is performed on the steel armor target plate and reinforced concrete under different intrusion angle working conditions,the best detection position and bullet position of the magnetic deflection angle are analyzed and determined,and the numerical variation relationship between the intrusion angle and the magnetic deflection angle is established.3.The hardware and software of the intrusion angle magnetic sensing measurement system are designed.The main design of the reset/set circuit,boost circuit,bias current circuit,filter circuit,signal amplification circuit and reference power circuit are based on the magnetoresistive sensor and microprocessor,and the hardware and software parts of the whole measurement system are analyzed and tested to work properly.4.The simulation and experimental results show that the magnetic deflection angle can be used to characterize the intrusion angle by establishing a magnetic field inside the fuze and using the magnetic perception measurement method,and the segmented linear interpolation algorithm is proposed to establish the numerical correspondence between the intrusion angle and the magnetic deflection angle to measure the intrusion angle.The numerical correspondence between the intrusion angle and the magnetic deflection angle is proposed to realize the measurement of the intrusion angle.