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 | Railgun
Author : Khan, I.I. ;Ghosh, A.A.;Rao, K.R.;Daniel, K.J.;Tatake, S.G.
Source : Defence Science Journal ; Vol:44(3) ; 1994 ; pp 257-262
Subject : 531.55 Projectiles
Keywords : Simulation ;Data acquisition;Computer based data acquisition system;Hypervelocity projectiles;Electromagnetic propulsion
Abstract : A railgun using cwas developed to launch hypervelocity projectiles. A 240 kJ, low inductance capacitor bank operating at 5 kV powered the railgun. Launchers and projectiles were designed and developed for this purpose. The currents producing the launch forces of the order of hundreds of kA. Even very low impedances for the current through the railgun circuit are substantial sources of energy losses. A simulation code was developed to optimise the performance of the railgun. Control and instrumentation facilities were set up along with a computer-based data acquisition system for measurement and analysis. The capacity to launch projectiles of 3-3.5 g weight to a velocity of more than 2.00 km/s was demonstrated. |
| | Modelling of a Regenerative Liquid Propellant Gun
Author : Rao, K.R. ;Ghosh, A.A.;Daniel, K.J.;Tatake, S.G.;Dhami, G.S.
Source : Defence Science Journal ; Vol:45(2) ; 1995 ; pp 161-171
Subject : 662.3 Propellants;66 Chemical Technology
Keywords : Liquid propellant mass ;Conceptual gun;Liquid propellant guns
Abstract : In the development of liquid propellant guns (LPG), there are numerous interdependent parameters which affect the performance of the gun. There are some difficulties in arriving at the dimensions of its various components. To help in this task, computer simulation was undertaken to predict the performance of a conceptual gun. This is a sensitivity study aimed at exploring the relationship between the interdependent parameters. The parameters which have a direct bearing on the performance of the gun, like areas of cross-section of vents, differential piston dimensions liquid propellant mass, and the combustion and reservoir chamber dimensions have been studied. The expected pressures and other parameters could be studied with the help of this model is thus helpful in the optimization of the design of LPGs. |
| | Modelling and Simulation of a Railgun powered by a Capacitor Bank
Author : Khan, I.I. ;Rao, K.R.;Tokekar, K.P.;Ghosh, A.A. ;Daniel, K.J.;Tatake, S.G.
Source : Defence Science Journal ; Vol:44(2) ; 1994 ; pp 131-137
Subject : 681.3 Computer Science;621.38 Electronics
Keywords : Hypervelocity projectiles;Optimized launcher pressure ;Payload velocity
Abstract : A railgun powered by a capacitor bank was developed to launch hypervelocity projectiles. The efficiency of the gun to a large extent will determine its feasibility for weapon applications. A simulation code was developed to predict the performance of the railgun. The railgun has been modelled as a time-varying impedance to determine the currents and the voltages from the power source. In the railgun circuit the currents and the voltages are of the order of hundreds of kiloamperes. Even very low impedances of the order of milli-ohm and micro-henry are substantial sources of energy losses. The measured and simulation currents at peak values agree with in 10%, validating the model. The simulation code accurately predicts the energy distribution in the system. Maximization of the projectile energy leads to improved and efficient designs. The simulation also leads to the optimized launcher pressure and payload velocity. |
| | Flash X Ray: A Diagnostic Tool for Shaped Charge Studies
Author : Tatake, S.G.;Kharat, D.K.
Source : Defence Science Journal ; Vol:42(4) ; 1992 ; pp 259-264
Subject : 623.4 Armaments and Ballistics
Keywords : War heads;Shaped charges
Abstract : At present many antitank weapon systems are employing shaped charge warheads. It is, therefore, extremely important for a designer to avail of the methods capable of predicting performance of shaped charges, mainly to achieve maximum penetration. For this purpose, it is necessary to study the behaviour of the shaped charge during actual firing tests. These tests are difficult because of high speed of events that take place, production of intense light, smoke, debris, etc, and the large scale destruction caused. To overcome these difficulties, flash x-ray system during the jet studies on 30, 60 and 90 mm shaped charges and the evaluation of jet characteristics parameters. |
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