the vibration control of the blanket through tensioning and various control operations. The load due to atmospheric drag is the same magnitude as that of the gravity gradient, and therefore it is possible to measure the atmospheric drag by checking the equilibrium position of the system. The vibration control of membrane space structures is achieved effectively through the change of membrane tension. To confirm this control concept, the tension of the 2-D array blanket will be changed under the appropriate control law during the usual vibration tests. Some control tests for the combined systems of the flyer unit and the 2-D array will be carried out. The test items and their remarks are as follows: • dynamic response (change of flyer unit attitude during array deployment); • damping augmentation (effect of loose coupling); • system identification (series-parallel adaptive identifier); • active damping (estimation of low authority controllers and high authority controllers); • robust control (optimum location of many sensors and actuators); • adaptive control (estimation of identifiers and control law). Power Generation Test The power generation test will be carried out to check the effectiveness of the electric power generation subsystem. Operational Sequence The operational sequence of the test is shown in Fig. 14. Acknowledgements — The authors gratefully wish to acknowledge the collaboration given by Fuji Heavy Industries, Mitsubishi Electric Company, Nippon Aircraft Company, Nippon Electric Company, Sharp Company and Toshiba Company. REFERENCES I. K. Miura, Method of Packaging and Deployment of Large Membranes in Space, 31st International Astronautical Federation, Tokyo, Japan, 1980; ISAS Research Note No. 160, 1981. 2. K. Miura, Proposition of Pseudo-Cylindrical Concave Polyhedral Shells, IASS Symposium on Folded Plates and Prismatic Structures, International Association for Shell Structures, Vienna, 1970. 3. K. Miura, The Fun of Map Folding, p. 19. Olivetti Corporation of Japan, 1978. 4. K. Miura, A. Ushirokawa, M. Natori and M. Sakamaki, 2-D Array Mission, Proc. 14th hit. Symp. Space Technol. Sci. Tokyo 363-368, 1984. 5. New Scientist, London, 23 October 1980. 6. K. Tanizawa, and K. Miura, Large Displacement Configurations of Bi-Axially Compressed Infinite Plate, Trans. Jpn Soc. Aero. Space Sci. 20, 177-187, 1978. 7. The Miura-Ori Map, British Origami 88, 3-5, 1981.
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