COMPUTATIONAL MORPHOGENESIS OF TRUSS STRUCTURES - APPLICATION TO TELESCOPE STRUCTURE

摘要

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.