Structural Design Of Ultra Large Ships Based On Direct Calculation Approach

Vladimir, Nikola; Senjanović, Ivo; Malenica, Šime; Lauzon, Jérôme de; Im, Hong-Il; Choi, Byoungdeog; Cho, Dae‐Seung

doi:10.18048/2016.00.63

Cited by 2 publications

(3 citation statements)

References 5 publications

(9 reference statements)

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“…The most typical FE application for class approval is cargo hold analysis. Vladimir et al [17] assessed the structural design of a ship, specifically its ability to withstand fatigue and extreme loads, using a conventional container ship as a reference. Their research focused on applying direct calculations to the design of ultra-large ships, emphasising evaluating structural reliability.…”

Section: Introductionmentioning

confidence: 99%

Linear Longitudinal Strength Analysis of a Multipurpose Cargo Ship under Combined Bending and Torsional Load

Abedin,

Franklin,

Mahmud

2023

JMSE

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Cargo ships with wide hatches usually have thin walls and limited torsional rigidity. Consequently, conducting a comprehensive torsional analysis is important because these loads can exert a significant impact. In this paper, the structural response of a multipurpose cargo ship to combined bending and torsional loads is studied using finite element analysis. The bending and torsional moments are calculated following the rules and standard regulations followed by the classification society. The ship’s 3D finite element model was verified using beam theory and direct calculations. In contrast, the accuracy of torsional stress was confirmed by comparing thin wall girder theory with direct calculation results. This study thoroughly examined the impacts of the still water bending moment, the vertical wave bending moment, and the wave-induced torsional moment on the structural response of ships. Furthermore, it scrutinised the impact of torsion on both open-deck and closed-deck ships. Hull girder normal stresses at midship due to still water and the vertical wave bending moment are shown to contribute to almost 70% of total stress in an inclined condition; stresses resulting from the horizontal wave bending moment contribute nearly 10%, while warping stresses contribute approximately 20% in open-deck ships. It is also shown that torsion has little impact on closed-deck ships. Finally, a buckling analysis was conducted to assess the ship’s buckling criteria, confirming that the linear buckling criteria were satisfied.

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Section: Introductionmentioning

confidence: 99%

Linear Longitudinal Strength Analysis of a Multipurpose Cargo Ship under Combined Bending and Torsional Load

Abedin,

Franklin,

Mahmud

2023

JMSE

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“…Namely, nowadays ultra large container ship with a capacity of 20,000 TEU and length about 400 m are regularly being built. The Rules of classification societies, developed on the basis of long-term experience, are not directly applicable to ULCSs, and therefore direct calculations are necessary for their safe and rational design [6,7,8]. In this context some classification societies have developed guidelines (rule notes) for inclusion of hydroleastic effects, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, for that purpose there are several hydrostructure software available around the world, mainly relying on the same theoretical assumptions, but having incorporated different numerical procedures. Such tools are mostly based on the application of the 3D potential flow theoretical models for fluid flow coupled with the 3D FEM structural models [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of structural design of ultra large container vessel

Vladimir¹,

Malenica²,

Senjanović³

et al. 2017

Rad Hrvatske akademije znanosti i umjetnosti

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The trend in modern sea transportation is building of ever larger container vessels, which require application of different numerical tools according to the relevant methodologies, in order to achieve their reliable structural design. The aim of this paper is to review direct strength assessment procedure based on long-term hydro-structure calculations including whipping and springing. As illustrative example, ultra large container ship with a capacity of 19000 TEU is selected and her structural design is evaluated both for fatigue and extreme response, respectively. Mathematical model is based on coupling of the 3D potential flow hydrodynamic model with the 3D FEM structural model. The general hydro-structure code HOMER, developed in Classification Society Bureau Veritas (BV) is used. Stress RAOs of selected structural details are obtained for full scatted diagram by the top-down procedure, and further used to assess their fatigue lives. Linear long term analysis is performed to define most contributing sea state to the vertical bending moment (VMB). Whipping response is computed on so called increased design sea state in time domain. Ultimate bending capacity was determined by nonlinear finite element analysis. Finally, extreme VBM is determined, and ultimate strength check according to the BV Rule Note NR583 was done.

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Structural Design Of Ultra Large Ships Based On Direct Calculation Approach

Cited by 2 publications

References 5 publications

Linear Longitudinal Strength Analysis of a Multipurpose Cargo Ship under Combined Bending and Torsional Load

Linear Longitudinal Strength Analysis of a Multipurpose Cargo Ship under Combined Bending and Torsional Load

Evaluation of structural design of ultra large container vessel

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