Structure design and mechanical measurement of inflatable antenna |
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| Institution: | 1. School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China;2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;1. Science and Technology on Advanced Composites in Special Environments Laboratory, Harbin Institute of Technology, Harbin 150080, China;2. Beijing Institute of Space Mechanics and Electricity, China Aerospace Science and Technology Corporation, Beijing 100094, China;1. Department of Civil and Environmental Engineering, Advanced Structures and Composites Center, University of Maine, USA;2. John C. Bridge Professor of Civil and Environmental Engineering and Department Chair, University of Maine, 5711 Boardman Hall Orono, ME 04469, USA;3. Department of Mechanical Engineering, Advanced Structures and Composites Center, University of Maine, USA;4. Libra Assistant Professor of Mechanical Engineering, University of Maine, USA;1. National Defense Academy of Japan, Yokosuka, Kanagawa, 239-8686, Japan;2. Osaka Prefecture University, Sakai, Osaka, 599 -8531, Japan;3. Kagawa University, Takamatsu, Kagawa, 761 -3496, Japan;4. Honda Motor, Haga, Tochigi, 321-3395, Japan;5. Waseda University, Shinjuku, Tokyo, 169-8555, Japan;6. Tottori University, Tottori, Tottori, 680-8550, Japan;7. Setsunan University, Neyagawa, Osaka, 572-8508, Japan;8. University of Fukui , Fukui, Fukui, 910-8507, Japan;9. Japan Aerospace Exploration Agency, Sagamihara, Kanagawa, 252-5210, Japan;10. National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588, Japan;1. University of Maine, Department of Mechanical Engineering, 5711 Boardman Hall Room 219, Orono, ME 04469-5711, USA;2. University of Maine, Department of Mechanical Engineering, 5711 Boardman Hall Room 206, Orono, ME 04469-5711, USA;3. University of Maine, Department of Mechanical Engineering, 5711 Boardman Hall Room 312, Orono, ME 04469-5711, USA;1. Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506-6106, USA;2. Institute of Constructional Lightweight Design, Johannes Kepler University Linz, Linz-Donau 4040, Austria |
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| Abstract: | This paper deals with the initial shape analysis, cutting-pattern analysis, surface accuracy measurement and modal testing of high-precision inflatable antennas reflectors that are intended for spaceflight applications. The initial shape analysis method, formulated on the basis of membrane theory and elastic mechanics, determines the required as-manufactured shape of the reflective surface of the antenna reflector. On the other hand, the cutting-pattern analysis method, with its formulation based on spring-mass representations, numerically calculates the required cutting pattern of the planar membrane gores that are to be assembled to form the 3-dimensional reflective surface. To validate the effectiveness of the proposed analysis methods, a 3.2-m antenna reflector model was designed, manufactured, and assembled for ground demonstration and testing. The reflective surface accuracy of this demonstration reflector model was measured by a photogrammetric measuring system. Shape adjustments of the reflective surface were performed by systematically adjusting the tension in the cables that were used to mount the reflector to its support structure. It was found that the reflective surface accuracy of the reflector model, as defined by its RMS error from a best-fit parabolic shape, was less than 1 mm. In addition, dynamic and RF tests were also performed on the demonstration reflector model. The test results indicated that the first-mode frequency of the reflector model agreed well with the corresponding analytical prediction, and its radiation pattern was also well focused. |
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