Accession Number : ADA300656

Title :   Prediction of Electromagnetic Fields Generated by Rail Guns.

Descriptive Note : Final rept. Jul 93-Jan 94,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH

Personal Author(s) : Kohlberg, Ira

PDF Url : ADA300656

Report Date : SEP 1995

Pagination or Media Count : 41

Abstract : Electromagnetic launch systems such as rail guns generate electromagnetic signatures that contain a spectrum of frequencies extending from quasi-DC up to tens of kilohertz. However, electromagnetic compatibility (EMC) considerations pertaining to the potential adverse effects of these fields on nearby electronic equipment remain largely unexplored. This report includes a discussion of the theoretical models used to predict the inductance gradient, the transient behavior of the currents produced in the rail gun structure, the dynamical generation of the external fields, and a comparison of the theoretical model with experimental data. The predicted rail inductance gradient of L'sub R = 0.52 muH/m compares very well with the measured value of 0.522 muH/m. The existence of an inductance gradient efficiency factor, E sub 0, is demonstrated, with a derived value of 0.75. This produces an effective inductance gradient of L' = E sub 0 L' sub R = 0.39 muH/m. Using this value of L' leads to a theoretical exit muzzle velocity of 525 m/s, which is within 5 percent of the measured value.

Descriptors :   *ELECTROMAGNETIC GUNS, *GUN LAUNCHERS, ELECTROMAGNETIC FIELDS, MAGNETIC FIELDS, EQUATIONS OF MOTION, TRANSMISSION LINES, ELECTROMAGNETIC RADIATION, ELECTRICAL RESISTANCE, INDUCTANCE, ELECTROMAGNETIC COMPATIBILITY, ELECTRON GUNS, ELECTROMAGNETIC SHIELDING, MUZZLE VELOCITY, SPECTRUM SIGNATURES.

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE