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IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century


IASS Symposium 2016

SESSION: Deployable Structures

Structural design of balloon-borne VLBI reflector considering sub-reflector adjustment mechanism failure using multiobjective optimization

< Table of Contents for Deployable Structures
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Deployable Structures
  • Pages: 10
  • Title: Structural design of balloon-borne VLBI reflector considering sub-reflector adjustment mechanism failure using multiobjective optimization
  • Author(s): Nozomu Kogiso, Ryo Kodama, Kimihiro Kimura, Yasutaka Satou, Akihiro Doi, Hiroaki Tanaka
  • Keywords: balloon-borne VLBI, trade-off analysis, robustness, multiobjective optimization
Abstract
This study evaluates the optimum configurations of the primary reflector of 3 m aperture for the balloon-borne VLBI (very long baseline Interferometry) that is a radio telescope for space observation from the stratosphere in the submillimeter wave band. The reflector composed of an iso-grid structure is required high aperture efficiency under the deformation due to variations of elevation angle and temperature during observation. In order to alleviate the deterioration of the aperture efficiency, the sub-reflector is equipped with a focal position adjustment mechanism. However, the adjustment mechanism may fail during observation. The effect of the adjustment mechanism failure on the aperture efficiency is investigated through multiobjective optimization approach. The design problem is solved using the STOM (satisficing trade-off method). As STOM can obtain the single Pareto solution corresponding to the user's preference for each objective function by introducing an aspiration level, the trade-off analysis is easily performed.

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