A theory of coupled beams for strength assessment of passenger ships

Naar, Hendrik; Varsta, Petri; Kujala, Pentti

doi:10.1016/j.marstruc.2005.03.004

Cited by 34 publications

(14 citation statements)

References 1 publication

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“…A simple and widely applied technique of analysing the ship structure is beam element analysis (Tadhiko 1973;Naar et al 2004). The methodology we have adopted consists of three steps.…”

Section: Structural Beam Analysismentioning

confidence: 99%

Buckling analysis on the hull of the historic paddle steamer ‘Medway Queen’

Rajaguru

Mason

Bailey

et al. 2013

Ships and Offshore Structures

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This study presents modelling and finite element simulation and the subsequent buckling analysis on the the historic Medway Queen paddle steamer ship which is under reconstruction now. The objective of this study is to assess buckling strength of the hull plate due to the longitudinal stress in the hull plates of the Medway Queen under various sea and live load conditions. A beam finite element analysis with structural elements is utilised to assess shear stress and bending moments of the ship structure. The model predictions for longitudinal stresses in hull plates are combined with buckling assessments on the hull plates in different, judged to be the most critical, locations along the ship's length. The structural beam model is utilised to simulate the ship's stress behaviour under hogging and sagging conditions with three different wave heights and four sets of live loads. From the longitudinal bending moment and shear force of all 24 simulation cases, extreme locations are identified and critical buckling stress on the plates close to these locations is predicted and compared with actual axial and shear stresses on the hull plate to predict the condition at which the buckling structural failure occurs.

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“…A simple and widely applied technique of analysing the ship structure is beam element analysis (Tadhiko 1973;Naar et al 2004). The methodology we have adopted consists of three steps.…”

Section: Structural Beam Analysismentioning

confidence: 99%

Buckling analysis on the hull of the historic paddle steamer ‘Medway Queen’

Rajaguru

Mason

Bailey

et al. 2013

Ships and Offshore Structures

View full text Add to dashboard Cite

show abstract

“…Naar et al [21] proposed a coupled beam method (CBM) for longitudinal bending response analysis of passenger ships with long multi-deck superstructures above the deck. They considered superstructures with the length equal to the ship's length.…”

Section: Brief Descriptionmentioning

confidence: 99%

“…Simplified approach to generate global response of large catamarans with the large superstructure windows at the early stages of design using extended beam theory was presented by Heggelund and Moan [12]. Naar et al [21] proposed a new approach called coupled beams method (CBM) to evaluate hull girder response of passenger ships. This method is based on the assumption that the global bending response of a modern passenger ship can be estimated by help of beams coupled to each other by distributed longitudinal and vertical springs.…”

Section: Introductionmentioning

confidence: 99%

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An extension of coupled beam method and its application to study ship's hull-superstructure interaction problems

Morshedsolouk

Khedmati

2011

Lat. Am. j. solids struct.

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This paper describes an extended formulation for the coupled beam method (CBM). The method is originally developed for elastic bending response analysis of passenger ships with large multi-deck superstructures. The extension is mainly performed to enable the available method in order to study elastic bending behaviour of ships fitted with superstructures of any sizes and locations. Finite element method (FEM) is applied for solving the equilibrium equations. Both hull and superstructure of the ship are modelled using beam elements. The connection between beam elements representing hull and superstructure is made using specially developed spring box elements. The accuracy of the extended method is demonstrated using an available experimental result. Then, two simplified structures, one representing a ship with a short superstructure and the other one representing a ship with a long superstructure, are analysed in order to validate the extended coupled beam method against the finite element method. In spite of some existing simplifications in the extended formulation, it is very effective in the early stages of ship structural design owing to its advantageous capability of rapid estimation of the longitudinal stress distributions along the height of ships at different stations.

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“…Based on this thought, people have started can also avoid the loss of analyzing accuracy when using a partial ship structural FEM model. Considering that it is a time consuming task to build a standard full ship 3-D FEM model, modeling with a large macro element (Hughes, 1980;Hughes, 1983) as well as with other equivalent simplified models (Naar et al, 2004;Satish and Mukhopadhyay, 2000) has been proposed for the full ship models. This method is far simpler than the requirements for the detailed meshes needed in Nastran or Sesam software.…”

Section: Introductionmentioning

confidence: 99%

A new rational-based optimal design strategy of ship structure based on multi-level analysis and super-element modeling method

Sun

Wang

2011

J. Marine. Sci. Appl.

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A new multi-level analysis method of introducing the super-element modeling method, derived from the multi-level analysis method first proposed by O. F. Hughes, has been proposed in this paper to solve the problem of high time cost in adopting a rational-based optimal design method for ship structural design. Furthermore, the method was verified by its effective application in optimization of the mid-ship section of a container ship. A full 3-D FEM model of a ship, suffering static and quasi-static loads, was used as the analyzing object for evaluating the structural performance of the mid-ship module, including static strength and buckling performance. Research results reveal that this new method could substantially reduce the computational cost of the rational-based optimization problem without decreasing its accuracy, which increases the feasibility and economic efficiency of using a rational-based optimal design method in ship structural design.

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A theory of coupled beams for strength assessment of passenger ships

Cited by 34 publications

References 1 publication

Buckling analysis on the hull of the historic paddle steamer ‘Medway Queen’

Buckling analysis on the hull of the historic paddle steamer ‘Medway Queen’

An extension of coupled beam method and its application to study ship's hull-superstructure interaction problems

A new rational-based optimal design strategy of ship structure based on multi-level analysis and super-element modeling method

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