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Open AccessArticle

Tie-System Calibration for the Experimental Setup of Large Deployable Reflectors

University of Catania, DICAR, Via S. Sofia 64, 95123 Catania, Italy
Thales Alenia Space Italia, Via Saccomuro 24, 00131 Roma, Italy
Author to whom correspondence should be addressed.
Machines 2019, 7(2), 23;
Received: 11 March 2019 / Revised: 5 April 2019 / Accepted: 10 April 2019 / Published: 15 April 2019
The trade-off between the design phase and the experimental setup is crucial in satisfying the accuracy requirements of large deployable reflectors. Manufacturing errors and tolerances change the root mean square (RMS) of the reflecting surface and require careful calibration of the tie-rod system to be able to fit into the initial design specifications. To give a possible solution to this problem, two calibration methods—for rigid and flexible ring truss supports, respectively—are described in this study. Starting from the acquired experimental data on the net nodal co-ordinates, the initial problem of satisfying the static equilibrium with the measured configuration is described. Then, two constrained optimization problems (for rigid or flexible ring truss supports) are defined to meet the desired RMS accuracy of the reflecting surface by modifying the tie lengths. Finally, a case study to demonstrate the validity of the proposed methods is presented. View Full-Text
Keywords: large deployable reflector; tie adjustment; experimental setup large deployable reflector; tie adjustment; experimental setup
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Cammarata, A.; Sinatra, R.; Rigato, R.; Maddio, P.D. Tie-System Calibration for the Experimental Setup of Large Deployable Reflectors. Machines 2019, 7, 23.

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