Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Lightweight Crane Design by Using Topology and Shape Optimization

위상최적설계와 형상최적설계를 이용한 크레인의 경량설계

  • Kim, Young-Chul (School of Mechanical and Automotive Engineering, Kunsan Nat'l Univ.) ;
  • Hong, Jung-Kie (School of Mechanical and Automotive Engineering, Kunsan Nat'l Univ.) ;
  • Jang, Gang-Won (Faculty of Mechanical and Aerospace Engineering, Sejong Univ.)
  • 김영철 (군산대학교 기계자동차공학부) ;
  • 홍정기 (군산대학교 기계자동차공학부) ;
  • 장강원 (세종대학교 기계항공우주공학부)
  • Received : 2010.12.29
  • Accepted : 2011.04.20
  • Published : 2011.07.01
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Abstract

CAE-based structural optimization techniques are applied for the design of a lightweight crane. The boom of the crane is designed by shape optimization with the shape of the cross section of the boom as the design variable. The design objective is mass minimization, and the static strength and dynamic stiffness of the system are set as the design constraints. Hyperworks, a commercial analysis and optimization software, is used for shape and topology optimization. In order to consistently change the shape of the elements of the boom with respect to the change in the shape of its cross section, the morphing function in Hyperworks is used. The support of the boom of the original model is simplified to model the design domain for topology optimization, which is discretized by using three-dimensional solid elements. The final result after shape and topology optimization is 19% and 17% reduction in the masses of the boom and support, respectively, without a deterioration in the system stiffness.

CAE 기반 구조최적설계법인 위상최적설계와 형상최적설계를 크레인의 경량화에 적용하였다. 붐은 단면 형상을 설계 변수로 변화시키면서 질량의 최소화를 최적설계의 목적함수로 하고 붐의 정적강도와 동적강성이 초기 모델의 성능에 비해서 저하되지 않아야 한다는 제한조건을 설정하였다. 구조해석 및 최적설계는 상용소프트웨어인 Hyperworks를 이용하여 수행하였으며 붐의 단면 형상의 변형에 따르는 요소망의 변동은 모핑 기능을 사용하여 수치 안정성을 확보하였다. 붐의 지지부는 초기 모델을 단순화시킨 설계 영역을 설정하고 이를 삼차원 솔리드 요소로 이산화한 후 위상최적설계를 수행하였다. 최적설계 결과 시스템의 전체 동적, 정적 강성을 저하시키지 않은 채로 붐은 19%, 지지부는 17% 경량화시킬 수 있었다.

Keywords

References

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