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Proceedings Paper

Design and analysis of a lightweight prestressed antenna back-up structure
Author(s): Zengxiang Ma; Dehua Yang; Jingquan Cheng
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Paper Abstract

The planned Square Kilometer Array (SKA) includes three thousand 15m antennas. The radio flux density from the sun is stronger, so that a solar array, such as Frequency-Agile Solar Radiotelescope (FASR) with hundreds of dishes can have smaller dish size. Therefore, light weight, low cost dish design is of vital importance. The reflecting surface supported by an antenna back-up structure, generally, should have an RMS surface error less than λ/20 (λ. is the operating wavelength). For resisting gravitational, wind, and ice-snow loadings, an antenna dish also requires reasonable mode frequencies. In this paper, different low cost small or medium back-up structure designs are discussed, including double-layer truss design and prestressed dish design. Based on discussion, an innovative light weight, prestressed back-up structure is proposed for small or medium aperture antennas. Example of a small 4.5m aperture dish design working below 3GHz is presented. This design is a one-layer prestressed truss structure with low weight, ease installation, and low manufacture cost. Structural analysis and modal extraction results show the structure is much stiffer than the same structure without prestressed loading.

Paper Details

Date Published: 6 August 2010
PDF: 11 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77333Q (6 August 2010); doi: 10.1117/12.856229
Show Author Affiliations
Zengxiang Ma, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Graduate Univ. of the Chinese Academy of Sciences (China)
Dehua Yang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Jingquan Cheng, National Radio Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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