1373. Structural Analysis of Large Hexagonal Compression Frame/Tension Cable Array Structure for SPS Microwave Antenna
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Paper
Abstract
The Microwave Power Transmission Systems (MPTS) of Satellite Power Systems (SPS) require planer array microwave antennas of large aperture diameters from 1,000 to 2,000 m (3,280 to 6,560 ft). Efficient microwave power transmission requires maintenance of the array surface flatness from 1/8 to 1/2 m (0.4 to 1.6 ft). These requirements clearly represent a formidable challenge to the structural engineer constrained by the cost of space construction in geosynchronous orbit.
This paper presents a structural analysis investigation of the credibility of satisfaction of the foregoing requirements with the subject structural concept in an MPTS employing solid-state electronics. In this concept, the solid-state amplifiers are structurally integral with the solar cell array, and is referred to as a solid-state sandwich design. The microwave surface is directed toward earth with the solar cells mounted on the back face illuminated by reflection from a system of primary and secondary reflectors. The subject structure, comprised of an orthogonal array of cables, tension stabilized by a peripheral compression-carrying frame, provides a primary structural support system with no encroachment on either surface. For this application, the structural analysis performed has uncovered no structural strength, stability, or stiffness issue that precludes use of the frame for this application. The paper presents frame structure weight versus achievable surface flatness of 12 to 48 cm (0.40 to 1.6 ft) for antenna aperture diameters of 1,000 to 2,000 meters (3,280 to 6,560 feet). The data are based on passive figure control. The critical structural requirements, load stability criteria, and parametric load/deflection analysis methodology used to derive the weights and figure control data are presented. Tri-beam torsional stiffness and tension cable analysis technique implications on hexagonal frame stability are identified. The pertinent structural characteristics of the space-fabricated graphite composite tribeam frame such as depth, machine-made beam stress levels, X-bracing pretension loads, structural size regimes, NASTRAN model techniques, and modal frequencies are also described.
