Application of an advanced beam theory to ship hydroelastic analysis

Senjanović, Ivo and Tomašević, Stipe and Vladimir, Nikola and Tomić, Marko and Malenica, Šime (2010) Application of an advanced beam theory to ship hydroelastic analysis. = Application of an advanced beam theory to ship hydroelastic analysis. In: International Workshop "Advanced Ship Design for Pollution Prevention", ASDEPP 2010, 23-24.11.2009., Split; Croatia.

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Official URL: https://www.fsb.unizg.hr/tulcs/public/reports/appl...

Abstract

Modern sea transport requires building of Very Large Container Ships (VLCS), which are relative flexible structures. Bearing in mind this fact, and taking into account the speed of VLCS, it is obvious that their natural frequencies could fall into the range of the encounter frequencies in an ordinary sea spectrum. Present Classification Rules for ship design and construction don't cover such conditions completely. This encourages scientists and engineers to develop more powerful and reliable tools for the analysis of ship behavior in seas and to improve the Rules. Hydroelastic analysis of VLCS seems to be appropriate solution for this challenging problem. Methodology of hydroelastic investigation is based on mathematical model which includes structural, hydrostatic and hydrodynamic submodels which are assembled into hydroelastic one. The hydroelastic problem can be solved at different levels of complexity and accuracy. It is obvious that the best way is to consider 3DFEM structural model and 3Dhydrodynamic model, but this approach would be too expensive, especially in preliminary design stage. At this level it would be more appropriate to couple 1DFEM model of ship hull with 3Dhydrodynamic model. In this paper, the emphasis is given on the advanced beam model which includes shear influence on torsion as an extension of shear influence on bending, and contribution of transverse bulkheads to hull stiffness. Beside structural model, hydrostatic and hydrodynamic submodels, as constitutive parts of hydroelastic model are briefly described. Verification of proposed numerical procedure is done by correlation analysis of the simulation results and the measured ones for flexible barge, for which the test results are available in the literature. Numerical example, which includes complete hydroelastic analysis of 7800 TEUcontainer ship, is also given. In this case, validation of 1DFEM model is checked by correlation analysis with the vibration response of the fine 3DFEM model. The obtained results confirm that advanced thin-walled girder theory is a reasonable choice for determining wave load effects on VLCS, in preliminary design stage. © 2010 Taylor & Francis Group, London.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): Beam model; Beam theories; Classification rules; Container ships; Correlation analysis; Hull stiffness; Hydro-elastic analysis; Hydrodynamic submodels; Hydroelastic; Numerical example; Numerical procedures; Preliminary design; Scientists and engineers; Sea spectra; Sea transport; Ship behavior; Ship designs; Ship hull; Structural models; Thin-walled girder; Transverse bulkhead; Vibration response; Wave load; Correlation methods; Flexible structures; Hulls (ship); Hydraulics; Hydrodynamics; Hydroelasticity; Mathematical models; Model structures; Numerical analysis; Pollution; Shipbuilding; Design
Subjects: TECHNICAL SCIENCE > Shipbuilding
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: 0 (19.12.2017.)
Citations SCOPUS: 2 (19.12.2017.)
Date Deposited: 15 Apr 2015 12:12
Last Modified: 19 Dec 2017 16:08
URI: http://repozitorij.fsb.hr/id/eprint/3629

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