Studies of the Structural Dynamic Behavior of Satellite Antenna System

A Transfer Matrix (TM) Analysis is formulated to predict the natural modes and frequencies of hoop-maypole type satellite antenna systems. Two directions of bending, axial extension/compression and torsion are represented as coupled by feed assemblies canted with respect to the mast, solar panels ti...

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Bibliographic Details
Main Author: Loewy, Robert G
Format: Report
Language:English
Subjects:
ANTENNA FEEDS
BENDING
COMPRESSION
COMPUTERIZED SIMULATION
COUPLING(INTERACTION)
CYCLES
DEFLECTION
DYNAMICS
FLEXIBLE STRUCTURES
Hoop maypole antennas
MATHEMATICAL PREDICTION
Mechanics
PE61102F
RESONANT FREQUENCY
SATELLITE ANTENNAS
SHEAR PROPERTIES
SIMPLIFICATION
STRUCTURAL COMPONENTS
Structural dynamics
STRUCTURAL PROPERTIES
STRUCTURAL RESPONSE
SYMMETRY
THREE DIMENSIONAL
TORSION
Transfer matrix analysis
TWO DIMENSIONAL
Unmanned Spacecraft
VIBRATION
WUAFOSR2302B1
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Summary:A Transfer Matrix (TM) Analysis is formulated to predict the natural modes and frequencies of hoop-maypole type satellite antenna systems. Two directions of bending, axial extension/compression and torsion are represented as coupled by feed assemblies canted with respect to the mast, solar panels tilted out of the plane of the center structure and masses offset from the mast centerline. Shear deflections, large steady cable loads and large compressive loads are accounted for in appropriate members. Using properties chosen as representative of such structures, trends are predicted with variations in size and configuration for several simplified configurations; these include, (a) two-dimensional cable-suspended rigid bars on a flexible center body (mast), (b) T and H -shaped center body sub structures in two and three-dimensional vibrations and (c) cable-stiffened, planar polygonal hoop assemblies. IN the last of these cyclic symmetry had to be invoked to avoid numerical difficulties. Some general conclusions are drawn regarding the free vibrations of such structures. The TM approach is seen as a viable alternative to FEM analyses, when structures are encountered which have major substructures with one dimension longer than its others. Full use of the TM analysis for hoop-maypole type structures must await a reformulation in which cyclic symmetry can be invoked, as in the plane hoop cases.