New design modifications of the supporting ring for a large deployable space reflector
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ORIGINAL PAPER
New design modifications of the supporting ring for a large deployable space reflector S. Tserodze1 · E. Medzmariashvili1 · C. G. M.van‘t Klooster2 · K. Chkhikvadze1 · M. Muchaidze1 · M. Nikoladze1 · A. Chapodze1 · I. Sigua1 · M. Sanikidze1 Received: 14 March 2020 / Revised: 13 August 2020 / Accepted: 17 August 2020 © CEAS 2020
Abstract Though theoretical and experimental studies of the design of large deployable antenna reflectors have already been carried out for quite a long time, the results obtained in this area of research still attract a lively interest and have good application prospects. In the present paper, two novel design modifications are described for the symmetric (i.e. with circular apertures) radio telescopes. The novelty consists in that improved stiffness and stability have been obtained by combining two conical pantograph systems and thus getting the whole hinged-bar structure consisting of cylindrical and sliding hinges only. Three FE models of the supporting ring structure are constructed and compared with one another using the NASTRAN FEA software. The degrees of freedom of hinges are simulated in local coordinate systems. A static, modal and buckling analysis had been done to investigate, strength and stiffness characteristics. Keywords Deployable ring structure · Large deployable reflector · Conical pantograph · V-folding bar · Strut · Cylindrical hinge
1 Introduction * S. Tserodze [email protected] E. Medzmariashvili [email protected] C. G. M.van‘t Klooster [email protected] K. Chkhikvadze [email protected] M. Muchaidze [email protected] M. Nikoladze [email protected] A. Chapodze [email protected] I. Sigua [email protected] M. Sanikidze [email protected] 1
Georgian Technical University, 68b Kostava St., 0175 Tbilisi, Georgia
Formerly ESA-Estec, Voorhout, The Netherlands
2
Mechanical transformable structures with hinged-bars are widely used in designing the supporting rings of reflector antennas. A large number of variants of the reflector antenna structure were investigated in previous years at the Institute of Space Structures of Georgia, later incorporated into Georgian Technical University, and also in collaboration with some leading European universities. A special mention should be made of the joint work with the European Space Agency (ESA-ESTEC) and München Technical University. Double-pantograph structures and structures with V-folding bars were investigated in both cylindrical and conical design variants [1–7]. In this paper we consider the cylindrical system because its symmetry guarantees best of all the proper tensioning of all segments of the flexible central part and the uniform distribution of stresses in its constituent parts [8–11]. The paper is based on the oral presentation at the workshop on Advanced Lightweight Structures and Reflector Antennas, October 14–16, 2018, Tbilisi, Georgia. Nowadays, in order to optimize the mass, designers give priority to ring structures with the smallest mass. An example is a cylindrical ring
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