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Vol. 53 (2012) No. 1 March n. 171


Computational Morphogenesis of Truss Structures –Application to Telescope Structure-

< Table of Contents for Vol. 53 (2012) No. 1 March n. 171
  • Journal Name: Journal of the International Association for Shell and Spatial Structures (J. IASS)
  • ISSN: (Electronic Version) 1996-9015
  • ISSN: (Print Version) 1028-365X
  • Issue: Vol. 53 (2012) No. 1 March n. 171
  • Pages: 49-56
  • Title: Computational Morphogenesis of Truss Structures –Application to Telescope Structure-
  • Author(s): M. Kunda, M. Kurita and H. Ohmori
  • Keywords: Structural optimization, Genetic algorithm, Multi-objective optimization, Homologous deformation
Abstract
Larger astronomical telescopes are required for research of deeper and darker space. Weight reduction techniques for telescopes are necessary to build them cost-effectively as well as constructionwise. However, it is not easy to design such a structure, because various tilt (elevation) angles caused by rotation of the optical support structure (OSS) of the telescope for astronomical observations result in a large change in the external load. In this paper, the scheme of multi-objective optimal design for truss structures for telescopes is proposed and demonstrated in an actually constructed 3.8 m telescope. The requirements of both weight minimization and homologous deformation are simultaneously satisfied by using SPEA2 as a multi-objective optimal method, where standard deviation of nodal displacements is adopted to evaluate homologous deformation.

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