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ASTM Selected Technical Papers
Composite Materials: Testing and Design (Third Conference)
By
CA Berg
CA Berg
coordinator
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FJ McGarry
FJ McGarry
coordinator
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SY Elliott
SY Elliott
1
Douglas Aircraft Company
,
Long Beach, Calif. 90846
;
symposium chairman
.
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ISBN-10:
0-8031-0308-5
ISBN:
978-0-8031-0308-5
No. of Pages:
683
Publisher:
ASTM International
Publication date:
1974

Advanced concepts for large, furlable space antennas have led to an extensive development program at the Jet Propulsion Laboratory (JPL) with configurations utilizing conical main reflectors. The antenna subreflectors for these conical configurations have unusual geometries and new structural requirements. Structural efficiency of the conical antennas is improved through the use of fiber composites and, as part of JPL's development program, a subreflector was designed and fabricated with graphite/epoxy material. This was sized to fit a subscale, 6-ft-diameter model. The subreflector is a cylindrical paraboloid with demanding criteria for contour surface precision, high thermal stability, and sufficient structural capacity for inertial launch loads in axial and transverse directions (12 to 18 g). In addition, dynamic launch environments impose constraints on allowable natural frequencies. This application presents broad design requirements and novel fabrication constraints. The paper describes the design, analysis, and fabrication of the subreflector.

1.
Oliver
,
R. E.
, “
Large Spacecraft Antennas: New Geometric Configuration Design Concepts
,”
JPL Quarterly Technical Review
, Vol.
1
, No. 1,
Jet Propulsion Laboratory
,
Pasadena, Calif.
,
04
1971
, pp. 78–85.
2.
Ludwig
,
A.
, “
Antenna Support Structure Aperture Blockage Loss
,”
JPL Quarterly Technical Review
, Vol.
1
, No. 1,
Jet Propulsion Laboratory
,
Pasadena, Calif.
,
04
1971
, pp. 86–96.
3.
Oliver
,
R. E.
and
Wilson
,
A. H.
, “
Furlable Spacecraft Antenna Development: An Interim Report
,” Technical Memorandum 33–537,
Jet Propulsion Laboratory
, Pasadena, Calif.,
15
04
1972
.
4.
Bushnell
,
D.
, “
Stress, Stability, and Vibration of Complex Shells of Revolution: Analysis and User's Manual for BOSOR 3
,” SAMSO TR-69-375, prepared for the Space and Missile Systems Organization, Department of Defense, by
Lockheed Missiles & Space Company
, Sunnyvale, Calif.,
09
1969
.
5.
Mc.Elman
,
J. A.
and
Knoell
,
A. C.
, “
Vibration and Buckling of Composite Plates and Shells
,”
Journal of Composite Materials
 0021-9983, Vol.
5
,
10
1971
.
6.
Ashton
,
J. E.
 et al
,
Primer on Composite Materials: Analysis
,
Technomic
,
Stamford, Conn.
,
1969
.
7.
Geiler
,
D. E.
, “
Analysis, Test, and Comparison of Composite Laminates Configured for Isotropic Low Thermal Expansion
,”
Proceedings
, 28th Annual SPI Conference,
Washington, D.C.
,
Society of the Plastics Industry
,
02
1973
.
8.
Robinson
,
E. Y.
, “
Applications of Advanced Composites for Space Antennas
,” presented at the NASA-Contractor Mini-symposium on Composite Materials,
Marshall Space Flight Center
,
Huntsville, Ala.
,
08
1972
.
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