- Volume 32 Issue 6
DOI QR Code
Structural Design Optimization of Lightweight Offshore Helidecks Using a Genetic Algorithm and AISC Standard Sections
유전 알고리듬 및 AISC 표준 단면을 사용한 경량화 헬리데크 구조 최적설계
- Sim, Kichan (Department of Ocean Engineering, Korea Maritime and Ocean University) ;
- Kim, Byungmo (Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University) ;
- Kim, Chanyeong (Department of Ocean Engineering, Korea Maritime and Ocean University) ;
- Ha, Seung-Hyun (Department of Ocean Engineering, Korea Maritime and Ocean University)
- Received : 2019.09.20
- Accepted : 2019.09.28
- Published : 2019.12.31
A helideck is one of the essential structures in offshore platforms for the transportation of goods and operating personnel between land and offshore sites. As such, it should be carefully designed and installed for the safety of the offshore platform. In this study, a structural design optimization method for a lightweight offshore helideck is developed based on a genetic algorithm and an attainable design set concept. A helideck consists of several types of structural members such as plates, girders, stiffeners, trusses, and support elements, and the dimensions of these members are typically pre-defined by manufacturers. Therefore, design sets are defined by collecting the standard section data for these members from the American Institute of Steel Construction (AISC), and integer section labels are assigned as design variables in the genetic algorithm. The objective is to minimize the total weight of the offshore helideck while satisfying the maximum allowable stress criterion under various loading conditions including self-weight, wind direction, landing position, and landing condition. In addition, the unity check process is also utilized for additional verification of structural safety against buckling failure of the helideck.
Supported by : 한국연구재단
- American Institute of Steel Construction (AISC) Inc. (1989) Allowable Stress Design and Plastic Design, 9th edition.
- American Institute of Steel Construction (AISC) Inc. (2017) AISC Shapes Database v15.0, AISC Steel Construction Manual, 15th edition.
- American Pertroleum Institute (API) (1996) Recommended Practice for Planning Designing, and Constructing Heliports for Fixed Offshore Platforms, 4th edition.
- ANSYS Inc. (2017) ANSYS Mechanical APDL Command Reference, Release 18.2.
- Balling, R.J., Briggs, R.R., Gilman, K. (2006) Multiple Optimum Size/Shape/Topology Designs for Skeletal Structures Using a Genetic Algorithm, J. Struct. Eng., 132(7), pp.1158-1165. https://doi.org/10.1061/(ASCE)0733-9445(2006)132:7(1158)
- Civil Aviation Authority (CAA) (2013) Standards for Offshore Helicopter Landing Areas, CAP-437.
- Deb, K., Gulati, S. (2001) Design of Truss-structures for Minimum Weight Using Genetic Algorithms, Finite Elem. Anal. & Des., 37(5), pp.447-465. https://doi.org/10.1016/S0168-874X(00)00057-3
- Det Norske Veritas (DNV) (2001) Helicopter Decks, DNV-OS-E401.
- Holland, J.H. (1975) Adaptation in Natural and Artificial Systems, The MIT Press, Cambridge, pp.217.
- International Civil Aviation Organization (ICAO) (1995) Heliport Manual, 3rd edition. Doc9261-AN/903.
- Jung, T.-W., Kim, B.-M., Ha, S.-H. (2017) A Study on Lightweight Design of Cantilever-type Helideck Using Topology Optimization, J. Comput. Struct. Eng. Inst. Korea, 30(5), pp.453-460. https://doi.org/10.7734/COSEIK.2017.30.5.453
- Kim, B.-M., Leem, J.-J., Ha, S.-H. (2018) Safety Evaluation of a Cantilever-type Helideck under Nonlinear Buckling, J. Korean Soc. Mar. Eng., 42(3), pp.203-209. https://doi.org/10.5916/jkosme.2018.42.3.203
- Mathworks Inc. (2004) Genetic Algorithm and Direct Search Toolbox for Use with Matlab, p.222.
- Rahami, H., Kaveh, A., Gholipour, Y. (2008) Sizing, Geometry and Topology Optimization of Trusses via Force Method and Genetic Algorithm, Eng. Struct., 30(9), pp.2360-2369. https://doi.org/10.1016/j.engstruct.2008.01.012