Multi-Objective Optimization of the Large Telescope Backup Structure Under Wind Loading

EasyChair Preprint 12983

Abstract

This paper describes a numerical design method for homologous deformation problems in large telescope structural design using heuristic size and shape optimization. The Large Submillimeter Telescope (LST), a new 50-meter class single-dish telescope, is planned to be constructed in Chile. From the view of the structural design of the LST, the primary reflector's lattice backup structure (BUS) prefers to be lightweight because the surface accuracy of the primary reflector depends on self-weight deformation. BUS, which comprises lattice elements and joints, must have high stiffness to support its primary reflector because the surface accuracy of the primary reflector requires an extremely small value to collect electromagnetic waves from deep space, regardless of its large diameter. Additionally, the primary reflector should maintain a paraboloid shape subjected to various elevation angles and wind loading conditions for the observation. LST antenna would be exposed to the strong wind. Therefore, various combinations of antenna posture and wind direction. Thus, a homologous deformation performance is required for optimal observation performance. This paper used the multi-objective function of homologous deformation in various loading conditions, such as wind directions and elevation angles of the antenna. Then, practical examples of the lattice structure of the LST model were demonstrated to show the effectiveness of the proposed solution.

Keyphrases: Genetic Algorithm, Homologous deformation, Large submillimeter telescope, multi-objective optimization

@booklet{EasyChair:12983,
  author    = {Hiroaki Kawamura and Chihiro Imamura and Akio Taniguchi and Yoichi Tamura and Toshiaki Kimura},
  title     = {Multi-Objective Optimization of the Large Telescope Backup Structure Under Wind Loading},
  howpublished = {EasyChair Preprint 12983},
  year      = {EasyChair, 2024}}