Accession Number : AD1026829


Title :   Comparison of Two Railgun Power Supply Architectures to Quantify the Energy Dissipated After the Projectile Leaves the Railgun


Descriptive Note : Technical Report


Corporate Author : Naval Postgraduate School Monterey United States


Personal Author(s) : Stewart,Mitchell C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1026829.pdf


Report Date : 01 Jun 2016


Pagination or Media Count : 79


Abstract : Railgun muzzle flash, or post-fire arcing, is a major concern to the Navy because of the potential associated thermal stresses. In this thesis, we compared two railgun power supplies in Matlab Simulink to quantify their associated post-fire energy. When the armature exits the rails, a finite energy from the railgun pulsed-power supply is inductively stored in the rails and discharges at the muzzle. This energy, which is due to the loss of the low-voltage electrical contact that is ordinarily between the armature and the rail, is forced by the system inductance to flow as an electrical discharge, creating a muzzle flash. Quantification of this post-fire rail energy in our simulation from both the existing railgun power supply and the proposed power supplya thyristor-based power supply versus a buck-boost converter, respectivelyreveals that the buck-boost converter topology is better suited for the railgun, particularly at minimizing the post-fire muzzle energy. The minimization of the post-fire energy allows for an extended rail life and potentially longer usage.


Descriptors :   power supplies , muzzle flash , capacitors , armatures , voltage , square waves , pulsed power , kinetic energy , equivalent circuits , magnetic fields , switched mode power supplies , rail guns , comparison , projectiles , thermal stresses , low voltage , electric contacts , inductance , electric discharges , thyristors


Subject Categories : Electric Power Production and Distribution
      Ammunition and Explosives
      Guns


Distribution Statement : APPROVED FOR PUBLIC RELEASE