1-2. Large Solar Array Design GARY F. TURNER & STEPHEN C. DEBROCK Summary and Introduction In the early 1970s, in conjunction with the initiation of the first Space Station solar array technology studies, a set of basic design decisions were made on the best generic approach to the design of solar arrays in sizes from tens to hundreds of kilowatts. Considerations were maximum potential for low weight, low launch package volume, adequate deployed structural stiffness and damping, at least a ten-year temperature cycle life, and adaptability to low-cost automated assembly. In the intervening 18 years between then and now, a number of programs contributed to the development of this basic design concept and the associated manufacturing processes. These developments form the foundation for the current Space Station Freedom Solar Array and platform designs and for two operational satellite programs. These current designs are unchanged in basic concept from the original studies in 1972, but they now reflect the mature technology which has been developed and proven out since then. To manufacture and test these systems, an integrated manufacturing, assembly and test facility has been constructed and is in operation with many automated features, including cell welding and substrate manufacture. Basic Design Concept for Large Area Solar Arrays In 1970, Johnson Space Center sponsored the Large Space Station Technology Evaluation Contract with Lockheed Missiles and Space Company. The program was conducted in two phases: (1) a trade study of all relevant structural and electrical design approaches which might be employed in a large 150 kw solar array design; and (2) the design and construction of a ground demonstration unit employing the selected design approaches. Figure 1 shows the ground deployment test unit during extension tests. Gary F. Turner, Manager, Aerospace Products, Lockheed Missiles & Space Co., Inc., Sunnyvale, CA 94089, USA. Stephen C. DeBrock, Manager, Power Systems Work Pkg 4, Space Station Program, Lockheed Missiles & Space Co., Inc., Sunnyvale, CA 94089, USA. Paper number IAF-ICOSP89-1-2.
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