Abstract
Inflatable structures are being examined these days as a new structural design paradigm to realize larger and lighter space structures. In designing such large and flexible space structures, the modal parameters including natural frequencies and mode vectors are important. However inflatable structures are liable to bring about the shape imperfection since their shapes may be changed by the pressurization and condition of inflation gas. In this study, in order to evaluate how the shape imperfections affect the modal parameters, the inflatable parabolic antenna structures, those have various shape imperfections, were analyzed. From the results of the analysis, it was found that some shape imperfections affect the natural frequencies and mode vectors significantly. This paper shows the relationship between the shape imperfection and the modal parameter of thin inflatable parabolic antenna and design methods of such inflatable structure based on the analysis results.
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