DOI QR코드

DOI QR Code

A study on minimum weight design of vertical corrugated bulkheads for chemical tankers

  • Shin, Sang-Hoon (Department of Aero Mechanical Engineering, Kyungwoon University) ;
  • Ko, Dae-Eun (Department of Naval Architecture and Ocean Engineering, Dong-Eui University)
  • 투고 : 2016.12.07
  • 심사 : 2017.06.13
  • 발행 : 2018.03.31

초록

Corrugated bulkhead has been adopted for cargo tank bulkheads of commercial vessels such as bulk carriers, product oil carriers and chemical tankers. It is considered that corrugated bulkhead is a preferred structural solution, compared to the flat stiffened bulkhead, due to several advantages such as lower mass, easier maintenance and smaller corrosion problems. Many researches to find the optimum shape of corrugated bulkhead have been mostly carried out for bulk carriers. Compared to corrugated bulkheads of bulk carriers, ones of chemical tankers are more complicated since they are composed of transverse and longitudinal bulkheads, and they are made of higher priced materials. The purpose of this study is the development of minimum weight design method for corrugated bulkhead of chemical tankers. Evolution strategy is applied as an optimization technique. It has been verified from many researches that evolution strategy searches global optimum point prominently by using multi-individual searching technique. Multi-individual searching methods need excessive time if they connect to 3-D finite element model for repetitive structural analyses. In order to resolve this issue, 2-D beam element connected to deck and lower stool is substituted for a corrugated structure in this study. To verify the reliability of the structural responses by idealized 2-D beam model, they have been compared with ones by 3-D finite element model. In this study, optimum design for corrugated bulkhead of 30 K chemical tanker has been carried out, and the results by developed optimum design program have been compared with design data of existing ship. It is found out that optimum design is about 9% lighter than one of existing ship.

키워드

참고문헌

  1. Andric, J., Zanic, V., Grgic, M., 2010. Structural optimization of corrugated transverse bulkheads made of stainless steel. Shipbuilding 61 (1), 18-27.
  2. Jang, C.D., Na, S.S., 1992. On the development of the generalized slope deflection method for the analysis and design of ship structures. J. Soc. Nav. Archit. Korea 29 (4), 202-213.
  3. Lee, K.Y., Roh, M.I., 2001. An efficient genetic algorithm using gradient information for ship structural design optimization. J. Ship Technol. Res. 48 (4), 161-170.
  4. Rechenberg, I., 1973. Evolutionsstrategie: Optimierung Technischer Systeme nach Prinzipien der Biologischen Evolution. Frommann-Holzboog Verlag, Stuttgart.
  5. Schwefel, H.P., 1981. Numerical Optimization of Computer Models. Wiley, Chichester.
  6. Shin, S.H., Ko, D.E., 2009. Development of the weight reduction program for corrugated bulkheads of a product oil carrier. J. Soc. Nav. Archit. Korea 46 (3), 279-289. https://doi.org/10.3744/SNAK.2009.46.3.279
  7. Shin, S.H., Nam, S.K., 2003. Minimum weight design for watertight and deep tank corrugated bulkhead. J. Soc. Nav. Archit. Korea 40 (6), 12-19. https://doi.org/10.3744/SNAK.2003.40.6.012
  8. Sim, Y.E., Haa, C.I., Nam, G.M., Kim, G.J., Lee, K.S., Kim, M.S., 2013. Structural safety evaluation for 75,000 TDW chemical tanker applied common structural rules. Special Issue Soc. Nav. Archit. Korea 1-7.
  9. Thomas, L., 2004. Ship Design and Construction, vol. II. SNAME.
  10. Yim, S.J., Kim, G.H., Yang, Y.S., 1987. Optimum structural design of a corrugated bulkhead by using flexible tolerance method. J. Soc. Nav. Archit. Korea 24 (4), 45-52.
  11. Yum, J.S., 1990. Minimum Weight Design of Corrugated Bulkheads Using the Generalized Slope Deflection Method (M.S. thesis). Seoul National University.

피인용 문헌

  1. LPG 운반선 화물창의 웨브 프레임 최소중량설계 vol.21, pp.6, 2020, https://doi.org/10.5762/kais.2020.21.6.103