Prediction of Electromagnetic Fields Generated by Rail Guns.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1995
- Accession Number
- ADA300656
Entities
People
- Ira Kohlberg
Organizations
- Battelle Memorial Institute