Structural Analysis of an Aluminum Multihull

David Fuentes,Claudio Troncoso,Marcos Salas,Gonzalo Tampier

doi:10.25043/19098642.123

David Fuentes, Claudio Troncoso + Show 2 more

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https://doi.org/10.25043/19098642.123

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Abstract

Structural analysis of a multihull is relatively complex since the connecting structure introduces additional stress than those typical of a monohull. The aluminum trimaran presented in this work was designed within the framework of the research project “Conceptual Design of a High-performance Vessel for Passenger Transport in Chile’s Austral Zone”. The trimaran was structurally measured using the regulations of classification societies Germanischer Lloyd, Det Norske Veritas y LloydÅLs Register. For the scantlings obtained with each regulation a Finite Element Model was created and the structural analysis for the slamming and splitting moment events was made. The results were analyzed and the stress concentration zones were determined to compare them with admissible stresses and conclude whether the structural sizing adequately and safely responds to the design stresses.

Highlights

Vessel CharacteristicsStructural analysis using the Finite Elements Method is a tool for structural design of vessels, that allows verifying if the structural sizing complies with the established acceptance criteria and to determine points of stress concentration, according to the admissible loads hypothesis in the analysis.The purpose of this work is to analyze the structural response of a multihull vessel, designed in aluminum, by constructing a Finite Elements Tridimensional Model, for each structural sizing calculated using the regulations of the classification houses “Germanischer Lloyd” (GL), “Det Norske Veritas” (DNV) y “Lloyds Register” (LR)
When comparing the results obtained for the sized model with this classification house with the acceptance criteria, the maximum equivalent stress for the Slamming event g (98,25 MPa) and the Splitting moment (80,1 MPa) event is less than the maximum permissible event
The acceptance criteria for this classification house says that the equivalent Von Mises stress obtained for the vessel during each simulation, must be less than σvm ≤ 112,5 MPa ; comparing the results obtained for each sized model with this classification house with the acceptance criteria, it is observed that for the maximum equivalent stress obtained for the Slamming event (106,32 MPa) and for the Splitting moment event (76,87 MPa) is less than the maximum permissible effort

Summary

Introduction

The purpose of this work is to analyze the structural response of a multihull vessel, designed in aluminum, by constructing a Finite Elements Tridimensional Model, for each structural sizing calculated using the regulations of the classification houses “Germanischer Lloyd” (GL), “Det Norske Veritas” (DNV) y “Lloyds Register” (LR). Using the finite elements method, Morris (1991) and Ojeda et al (2004) performed different structural analyses to multihull vessels were they identified the stresses and deformations of the structure; using the same method, Paik and Hughes (2006) and Blanchard and Chunhua (2007) analyzed the different cargo conditions established by different classification houses were they highlight the Slamming load in the Crest Landing and Hollow Landing moments and the Splitting Moment.

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