Evaluation of Magnetic Shields for Instrumented Launch Packages
Abstract
As pan of an investigation to determine the feasibility of HSTSS telemetry techniques in EM launchers, a series of experiments was conducted to evaluate the performance of magnetic shields. The magnetic field was measured at several positions along the bore centerline of the MCL under stationary operation, and comparable EMAP3D calculations were performed. The qualitative agreement between experimental and computational results was very good. Hollow, metallic cylindrical shields were considered for their capacity to suppress the transient magnetic fields. One, comprised of A17075, weighed 130 g; the other, of ETP Cu, weighed 430 g. The copper shield was observed to reduce the induced peak voltages by more than 80%, which occurred at the earliest stages of the current rise. However, after 250 microsec, the induced voltages were no longer attenuated by the shield. Improved shielding may be obtained with thicker or more electrically conductive cylindrical shells. If the induced fields are found to be problematic in actual EM launches, a more sophisticated shield design will be needed since the significant weight added to a 200-g launch package by this design would render its use impractical.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2002
- Accession Number
- ADA400096
Entities
People
- J. Faust
- L. Burke
- M. Erengll
- S. Levinson
Organizations
- University of Texas at Austin