By Carlos Guedes Soares; International Conference on Marine Structures
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Extra resources for Advances in marine structures : proceedings of the 3. International Conference on Marine Structures - MARSTRUCT 2011, Hamburg, Germany, 28 - 30 March 2011
Comparison of the dry natural and wet resonance frequencies for the 140 000 dwt bulk carrier in water for ballast condition (Hz). 704 Table 3. Comparison of the dry natural and wet resonance frequencies for the 32 000 dwt bulk carrier in water for fully loaded condition (Hz). 115 wet resonance frequency values are presented in Table 3 for the fully loaded case. It can be seen from Table 3 that there is a very good agreement between the finite element and boundary element calculations. The principal coordinates presented in the figures are associated with the excitation by regular sinusoidal waves of 1 m amplitude.
The plot also reports the total bending moment distribution (both the one estimated before the calculation and the one actually obtained by FE analysis), which accomplish to the condition above mentioned, referred to “target” in the figure. The structure of the ship has been modeled employing plate and beam elements. The principal dimensions of the elements correspond transversally to the spacing of the longitudinal ordinary stiffeners and longitudinally to the ordinary frame spacing. Altogether, the model contains 50041 nodes, 33178 beam and 60544 plate elements.
Linear static analyses have been performed employing Leonardo Hull 3D, a pre and post processor developed by RINA, and the solver MSC-NASTRAN 2008. As expected, the higher stresses appear to be mainly related to global loads (vertical bending moments) and hence the deck and, less, Figure 2. the bottom result to be the most stressed parts. Concentration effects are found at the hatch corners, which appear to be a very important zone to be monitored. On the bottom, due to combination of global and local loads, the part corresponding to the center of the hold presents higher values of stresses, compared both to the values found in the surrounding elements and also predicted using an hull girder section theory.