S1903-2-5 宇宙展開構造物への適用に向けた軽量薄板構造の新たな設計概念(宇宙構造・材料(2),社会変革を技術で廻す機械工学)

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The object of this study is to establish a new design methodology for ultra-light-weight solar array paddles, which is defined as "an integrated structure". Future solar array paddles applied for space explorations would require high power that greatly exceeds 100 W/kg. We would like to propose a hinge-less, ultra-light-weight deployable solar array paddle as a functional/structural integrated structure. By giving a curvature, the out-of-plane loading on a thin plate is transferred into the in-plane loading. The important issues to be considered are how to keep the given curvature during various kinds of loading. We have designed and analyzed a curved membrane structure implemented with tendon cables and/or thin strips. The tendon cables can improve eigen frequency of the curved membrane by transforming a lower deformation mode to a higher mode. The strips also improve eigen frequency of the curved membrane by increasing geometric moment of inertia. More mass is needed for the strips. By combining the tendon cables and the strips, much more improvement can be obtained as a synergic effect. In the most effective case, 75 times higher stiffness than flat membrane can be obtained.
2010-09-04