This paper presents a procedure to optimize a conceptual ship side structure from a crashworthiness point of view. As an example, this procedure is presented for a chemical or product tanker. A particle swarm optimization algorithm is used for the procedure. The classification society compliance of the conceptual design is checked through service loads that are applied to the ship's hull girder according to Det Norske Veritas. The collision simulations to assess the crashworthiness are carried out with the non-linear finite element solver LS-DYNA. An element length-dependent constant-strain failure criterion is chosen to simulate rupture. A numerical simulation of a stiffened plate serves to validate the material relation until failure. This material relation and failure definition makes possible an accurate prediction of the structural energy absorbed until inner plate rupture. The procedure is adjustable and applicable to other ship types and scenarios.
PaikJ. K.PedersenP. T.‘Modeling of the internal mechanics in ship collisions.’Ocean Engng23 (2) (1996): 107–142
2.
PeschmannJ.KulzepA.‘Seitenkollision von Doppelhüllenschiffen (Side collision of double hull ships). Abschlußbericht zum Teil D2A.’ Hamburg University of Technology, Hamburg, Germany, 1999.
3.
ScharrerM.ZhangL.EggeE.‘Kollisionsberechnungen in schiffbaulichen Entwurfssystemen (Collision calculation in naval design systems).’ Bericht ESS 2002.183, Germanischer Lloyd, Hamburg, Germany, 2002.
4.
TörnqvistR.Design of crashworthy ship structures PhD Dissertation, Department of Naval Architecture and Offshore Engineering, Technical University of Denmark, Kongens Lyngby, Denmark, 2003.
5.
Report of the 16th International Ship and Offshore Structures Congress (ISSC), Southampton, UK, 20–25 August 2006, Vol. 2, 2006.
6.
PaikJ. K.‘Practical techniques for finite elememt modelling to simulate structural crashworthiness in ship collisions and grounding (Part I: theory).’Ships Offshore Structs2 (1) (2007): 69–80
7.
PaikJ. K.‘Practical techniques for finite elememt modelling to simulate structural crashworthiness in ship collisions and grounding (Part II: verification).’Ships Offshore Structs2 (1) (2007): 81–85
8.
EhlersS.KlanacA.TabriK.‘Increased safety of a tanker and a RO-PAX vessel by implementing a novel sandwich structure.’ In Proceedings of the Fourth International Conference onThe collision and grounding of ships (ICCGS 2007), Hamburg, Germany, 9–12 September 2007.
9.
KlanacA.EhlersS.TabriK.RudanS.BroekhuijsenJ.‘Qualitative design assessment of crashworthy structures.’ In Proceedings of the 11th International Congress of the International Maritime Association of the Mediterranean (IMAM 2005), Lisbon, Portugal, September 2005.
10.
KonterA.BroekhuijsenJ.VredeveldtA.‘A quantitative assessment of the factors contributing to the accuracy of ship collision predictions with the finite element method.’ In Proceedings of the Third International Conference onThe collision and grounding of ships (ICCGS 2004), Tokyo, Japan, 25–27 October 2004.
11.
SanoA.MuragishiO.YoshikawaT.‘Strength analysis of a new double hull structure for VLCC in collision.’ In Proceedings of the International Conference on The Design and Methodologies for Collision and Grounding Protection of Ships, San Francisco, California, USA, August 1996, paper 8–1
12.
ZhangL.EggeE. D.BruhmsH.‘Approval procedure concept for alternative arrangements.’ In Proceedings of the Third International Conference onThe collision and grounding of ships (ICCGS 2004), Tokyo, Japan, 25–27 October 2004.
13.
EhlersS.BroekhuijsenJ.AlsosH. S.BiehlF.TabriK.‘Simulating the collision response of ship side structures: a failure criteria benchmark study.’Int. Ship Prog.55 (2008): 127–144
14.
EberhartR. C.KennedyJ.‘A new optimizer using particle swarm theory.’ In Proceedings of the Sixth International Symposium onMicro machine and human science (MHS ‘95), Nagoya, Japan, 4–6 October 1995.
15.
KennedyJ.EberhartR. C.‘Particle swarm optimization.’ In Proceedings of the IEEE International Conference onNeural networks, Piscataway, New Jersey, 1995, pp. 1942–1948 (IEEE, New York).
NaarH.VarstaP.KujalaP.‘A theory of coupled beams for strength assessment of passenger ships.’Mar. Structs17 (8) (2004): 590–611
18.
Rules for ships. Part 3, ch. 1, section 14, Buckling controlDet Norske VeritasDet Norske Veritas2000)
19.
HughesO. F.GhoshB.ChenY.‘Improved prediction of simultaneous local and overall buckling of stiffened panels.’Thin-Walled Structs42 (2004): 827–856
20.
EhlersS.KlanacA.KõrgesaarM.‘A design procedure for structures against impact loading.’STG yearbook Hamburg Schiffbautechnische Gesellschaft2008 (in press)
EhlersS.VarstaP.‘Strain and stress relation for non-linear finite element simulations.’Thin-Walled Structs47 (11) (2009): 1203–1217
23.
EhlersS.‘Strain and stress relation until fracture for finite element simulations of a thin circular plate.’Thin-Walled Structs (2009 (in press)).
24.
AlsosH. S.AmdahlJ.HopperstadO. S.‘On the resistance to penetration of stiffened plates, Part II: numerical analysis.’Int. J. Impact Engng36 (2009): 875–887
25.
AlsosH. S.HopperstadO. S.TörnqvistR.AmdahlJ.‘Analytical and numerical analysis of local necking using a stress based instability criterion.’Int. J. Solids Structs45 (2008): 2042–2055
