Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Optimal Design System of Grillage Structure under Constraint of Natural Frequency Based on Genetic Algorithm

고유진동수 제한을 갖는 골조구조의 GA 기반 최적설계 시스템

  • Kim, Sung Chan (Department of Naval Architecture & Marine Engineering, Inha Technical College) ;
  • Kim, Byung Joo (NSTEC) ;
  • Kim, E Dam (Department of Naval Architecture & Marine Engineering, Inha Technical College)
  • 김성찬 (인하공업전문대학 조선기계과) ;
  • 김병주 (엔에스텍) ;
  • 김이담 (인하공업전문대학 조선기계과)
  • Received : 2021.11.11
  • Accepted : 2021.12.08
  • Published : 2022.02.20
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Abstract

Normal strategy of structure optimization procedure has been minimum cost or weight design. Minimum weight design satisfying an allowable stress has been used for the ship and offshore structure, but minimum cost design could be used for the case of high human cost. Natural frequency analysis and forced vibration one have been used for the strength estimation of marine structures. For the case of high precision experiment facilities in marine field, the structure has normally enough margin in allowable stress aspect and sometimes needs high natural frequency of structure to obtain very high precise experiment results. It is not easy to obtain a structure design with high natural frequency, since the natural frequency depend on the stiffness to mass ratio of the structure and increase of structural stiffness ordinary accompanies the increase of mass. It is further difficult at the grillage structure design using the profiles, because the properties of profiles are not continuous but discrete, and resource of profiles are limited at the design of grillage structure. In this paper, the grillage structure design system under the constraint of high natural frequency is introduced. The design system adopted genetic algorithm to realize optimization procedure and can be used at the design of the experimental facilities of marine field such as a towing carriage, PMM, test frame, measuring frame and rotating arm.

Keywords

Acknowledgement

이 논문은 2020년도 인하공업전문대학 학술연구사업 지원에 의하여 연구되었음.

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