Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements

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Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements. / Laakso, Aleksi; Avi, Eero; Romanoff, Jani.

In: Ships and Offshore Structures, Vol. 14, No. sup1, 01.10.2019, p. 135-147.

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@article{ed26b3932e4b4c9fa725881287d9c1c6,
title = "Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements",
abstract = "Equivalent single layer (ESL) elements provide an easy and computationally effective way to model stiffened plates in finite element analysis of ship structures. Secondary stiffeners are incorporated into the plate or shell formulation. In the free vibration analysis, these elements ignore inertia induced local deformation of plating between the secondary stiffeners. Oscillating motion causes inertia induced body load that locally deforms the plate. This local deformation may have a significant effect on the global modal frequencies of a deck structure. This paper presents a method for correcting ESL modal frequencies by modifying generalised mass and stiffness of the modes. The modification is based on the kinetic and strain energies of the local deformations. Energy components are derived from local consideration of plate in cylindrical bending under enforced support vibration. The method is validated in a case study of ship deck structure against shell mesh results, and good agreement is found.",
keywords = "deck, equivalent element, equivalent single layer, finite element method, Free vibration, stiffened panel",
author = "Aleksi Laakso and Eero Avi and Jani Romanoff",
year = "2019",
month = "10",
day = "1",
doi = "10.1080/17445302.2018.1561173",
language = "English",
volume = "14",
pages = "135--147",
journal = "Ships and Offshore Structures",
issn = "1744-5302",
number = "sup1",

}

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TY - JOUR

T1 - Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements

AU - Laakso, Aleksi

AU - Avi, Eero

AU - Romanoff, Jani

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Equivalent single layer (ESL) elements provide an easy and computationally effective way to model stiffened plates in finite element analysis of ship structures. Secondary stiffeners are incorporated into the plate or shell formulation. In the free vibration analysis, these elements ignore inertia induced local deformation of plating between the secondary stiffeners. Oscillating motion causes inertia induced body load that locally deforms the plate. This local deformation may have a significant effect on the global modal frequencies of a deck structure. This paper presents a method for correcting ESL modal frequencies by modifying generalised mass and stiffness of the modes. The modification is based on the kinetic and strain energies of the local deformations. Energy components are derived from local consideration of plate in cylindrical bending under enforced support vibration. The method is validated in a case study of ship deck structure against shell mesh results, and good agreement is found.

AB - Equivalent single layer (ESL) elements provide an easy and computationally effective way to model stiffened plates in finite element analysis of ship structures. Secondary stiffeners are incorporated into the plate or shell formulation. In the free vibration analysis, these elements ignore inertia induced local deformation of plating between the secondary stiffeners. Oscillating motion causes inertia induced body load that locally deforms the plate. This local deformation may have a significant effect on the global modal frequencies of a deck structure. This paper presents a method for correcting ESL modal frequencies by modifying generalised mass and stiffness of the modes. The modification is based on the kinetic and strain energies of the local deformations. Energy components are derived from local consideration of plate in cylindrical bending under enforced support vibration. The method is validated in a case study of ship deck structure against shell mesh results, and good agreement is found.

KW - deck

KW - equivalent element

KW - equivalent single layer

KW - finite element method

KW - Free vibration

KW - stiffened panel

UR - http://www.scopus.com/inward/record.url?scp=85059557408&partnerID=8YFLogxK

U2 - 10.1080/17445302.2018.1561173

DO - 10.1080/17445302.2018.1561173

M3 - Article

VL - 14

SP - 135

EP - 147

JO - Ships and Offshore Structures

JF - Ships and Offshore Structures

SN - 1744-5302

IS - sup1

ER -

ID: 31363886