Analysis Techniques and Instrumentation for Blast Loaded Parabolic Antennas.
Abstract
In this report, a physical model and blast analysis techniques are developed for a solid surface parabolic antenna, using the NASTRAN structural analysis program. The antenna considered is the US Army Satellite Communication Agency Antenna, consisting of a center section and four petal sections, all of which have the structural configuration of stressed skin over reinforcing ribs. The antenna is modelled as a network of flat membrane plates, except at connection points, where appropriate bending stresses are accounted for. An alternate model makes it possible to consider, to some extent, bending stresses in the skin. A simplifying assumption of symmetrical behavior of the reflector reduces analysis costs considerably. When analysis of the center section alone is necessary, removal of a minimal number of computer cards from the complete model results in a model of the center section. Computer programs are described which translate the blast parameters and antenna geometry into concentrated dynamic loads at NASTRAN grid points. The analysis procedure for dynamic loads is outlined. Instrumentation and maximum overpressure loads for a shock tube test are recommended, based on available information. This task was supported financially by the Scientific Services Program of the US Army Research Office. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1977
- Accession Number
- ADA042600
Entities
People
- James W. Jeter Jr
Organizations
- United States Army Communications-Electronics Command