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 1mm. 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.
Highlights ► We formulate initial shape analysis and cutting pattern analysis for inflatable antenna. ► A 3.2-m antenna demonstration model was designed, manufactured, and assembled for testing. ► Non-contact mechanical measurement techniques are used for inflatable antenna. ► Surface accuracy is high and the dynamic test result is agreed well with the analytical results.
Structure design and mechanical measurement of inflatable antenna
Acta Astronautica ; 76 ; 13-25
2012-02-05
13 pages
Article (Journal)
Electronic Resource
English
Structure design and mechanical measurement of inflatable antenna
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