Investigation the Effect of B Dot Probe Positions in 500kJ Pulsed Power Supply System using MATLAB Simulation

Abstract

In a rail gun a small sensing coil named B dot probe is kept over the path of armature which generates the signal from an induced voltage based on faraday's law. The output signal which is generated from the B dot probes consist of a positive and negative elements. The zero-crossing point in the output signal is hypothetical to be the time of passage for the centroid of the armature current, and the zero-crossing times from different probes kept along the length of the rails are on the whole employed to find out the velocity of the projectile. Pulsed power supply system has got a significant role in rail gun system as it gives an enormous electrical energy in a short duration of time to accelerate the movable armature with higher velocity. Pulsed power supply system which is generally capacitor based are the most well-known form of pulsed power supplies system used in rail gun investigation for the past several years. In India for surface fire support, 500-kJ capacitor module pulsed power system design which is capable to accelerate the projectile with a velocity of 1km/s to 1.5km/s, is currently under investigation. In this paper an effort is made to design a 500kJ PPS using MATLAB in order to predetermine the gun parameters such as acceleration of the projectile, muzzle velocity, peak current, current at exit, and also effective barrel length. In general the capacitors are grouped into modules and they are triggered at different time to get desired parameters of rail gun. In this work the capacitors are grouped in five modules and modules are triggered by using projectile positions and projectile position is being identified by using B dot probes positions.