Efektivna krutost konstrukcije strojarnice velikih kontejnerskih brodova

Senjanović, Ivo and Tomić, Marko and Vladimir, Nikola (2011) Efektivna krutost konstrukcije strojarnice velikih kontejnerskih brodova. = Effective stiffness of the engine room structure in large container ships. Brodogradnja : časopis brodogradnje i brodograđevne industrije, 62 (1). pp. 15-27. ISSN 0007-215X. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q4 (2011). Točan broj autora: 3.

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Abstract

Very large container ships are rather flexible due to the large deck openings. Therefore, hydroelastic stress analysis is required as a basis for a reliable structural design. In the early design stage, the coupling of the beam model with a 3D hydrodynamic model is rational and preferable. The calculation is performed using the modal superposition method, so natural hull modes have to be determined in a reliable way. Therefore, the advanced thin-walled girder theory, which takes the influence of shear on both bending and torsion into account, is applied for calculating the hull flexural and torsional stiffness properties. A characteristic of very large container ships is the quite short engine room, whose closed structure behaves as an open hold structure with increased torsional stiffness due to the deck effect. The paper deals with the calculation of its effective torsional stiffness parameters by utilizing the energy balance approach. Also, estimation of distortion of transverse bulkheads, as a result of torsion and warping, is given. The procedure is checked by the 3D FEM analysis of a ship-like pontoon. Such a modified beam model of the engine room structure can be included in the general beam model of a ship hull for the need of hydroelastic analysis, where only a few first natural frequencies and mode shapes are required. For practical use in the preliminary design stage of ship structures, the simplicity of the beam model presents an advantage over 3D FEM models.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): container ship, engine room structure, torsion, warping, distortion, thin-walled girder, analytical solution, FEM, hydroelasticity
Subjects: TECHNICAL SCIENCE > Shipbuilding
TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design
600 Department of Naval Engineering and Marine Technology > 650 Chair of Marine Machinery and System Design
Indexed in Web of Science: Yes
Indexed in Current Contents: No
Citations JCR: 5 (15.11.2017.)
Quartiles: Q4 (2011)
Citations SCOPUS: 6 (15.11.2017.)
Date Deposited: 04 Dec 2014 11:49
Last Modified: 15 Nov 2017 12:38
URI: http://repozitorij.fsb.hr/id/eprint/3109

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