Structural desin of a bulbous bow with regard to collision safety

Marine 2013 : computational methods in marine engineering V ; proceedings of the V International Conference on Computational Methods in Marine Engineering, held in Hamburg, Germany, 29 - 31 May 2013 / CIMNE. Birgitt Brinkmann ... (ed.). - 1. ed. - Barcelona : Internat. Center for Numerical Methods in Engineering, 2013. - Seite 901-911

Contribution to Conference

5th International Conference on Computational Methods in Marine Engineering, MARINE 2013

Publisher

Internat. Center for Numerical Methods in Engineering

Dimensioning of bulbous bows is based on conservative and usually empirically developed Classification Rules. Furthermore their structural design is subordinate to manufacturing aspects. Thus bulbous bow structures are mostly overdimensioned and could be regarded as rigid in case of a ship collision. Weakening bulbous bows stiffness results in noticeable influence on absorbable collision energies. Anyhow this approach is limited because usual operating loads like hydrostatic pressure or slamming loads are still to be considered. The paper describes a design approach for bulbous bows that aims at the best compromise between preferably weak regarding collision load on the one hand and preferably stiff under operating load on the other hand. Linear and nonlinear FEM-calculations based on ultimate load theory are combined in order to estimate stability of weakened designs. Examinations are accompanied by nonlinear explicit FEM-calculation of a ship collision scenario taking into account stiffness of striking and struck ship.

Schlagworte

Buffer bow

Bulbous bow

Crashworthiness

Ship collision

Structural design

DDC Class

600: Technik

620: Ingenieurwissenschaften

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Structural desin of a bulbous bow with regard to collision safety