Design And Application Of High-precision Self-speed Measurement System For Low-spin Projectile Muzzl

Aiming at the future operational needs,it has become the focus of the development of ammunition technology to gradually reduce the mode of operation of ranged mass destruction and instead increase the mode of operation of precise strikes and effective destruction of targets.The muzzle velocity of a projectile directly affects the precision strike capability of the weapon.This thesis takes the 105 mm multipurpose projectile as the object of study,and designs a dual coil velocity measurement system based on the principle of electromagnetic induction,while investigating whether the environmental changes in the magnetic field coupling between the gun and the projectile during firing can be used as a second environmental information.Based on the analysis of existing projectile muzzle velocimetry technology,a high precision self velocimetry system is designed for the muzzle of low-spin projectiles in conjunction with engineering requirements.The system uses two sets of induction coils embedded in the projectile body to generate an induction voltage when the projectile leaves the muzzle,and generates a pulse signal through a signal conditioning circuit to measure the time interval between the movement of the two sets of coils out of the muzzle,and the muzzle speed of the projectile is calculated by a microcontroller.A scheme design for a bullet-loaded dual coil velocimetry system was completed,with requirements for the velocimetry waveform in terms of facilitating accurate acquisition of velocimetry times.The error of the velocimetry system was analysed and the maximum relative error of the system was calculated to be 0.732%in theory,proving the correctness and reliability of the velocimetry system in terms of principle and structure.Taking the 105 mm multi-purpose projectile as an example,the COMSOL software is used to build a mathematical model of the barrel,coil and velocity measurement system,to simulate the variation of the magnetic field around the barrel and the variation of the induced voltage generated when the coil moves out of the muzzle of the gun,to analyse the influencing factors and applicability of the induced voltage,and to verify that the environmental variation of the magnetic field coupling during the firing of the gun and the projectile can be used as a second environmental signal The use of The simulation of a dual coil velocimetry system is carried out to analyse the characteristics of the induced voltage generated by the coil under the actual projectile profile and the influence of the coil mounting position on the system signal,providing a basis for the structural design of the velocimetry system and the parameter design of the hardware circuit.The hardware circuits of the different functional modules are completed and software control programs are written to realise the relevant functions of the velocimetry system.Through debugging and testing of the system,the feasibility and correctness of applying the bullet-loaded dual coil velocimetry system to muzzle velocimetry is verified,and finally,the application of the velocimetry system in the correction of empty blast time and as information on the exit of lowspinning bullets from the muzzle is analysed.