leonardo hull ship structural analysis

Leonardo Hull:Ship Structural Analysis

ships in servicedesign and construction

a smooth integration of RINA scantling verification rules

for the shipyard:

Use of a software directly linked to RINA scantling verification Rulesallows to have them smoothly integratedinto the design and production process

Use of Leonardo Hull for both design anddrawing approval speeds up the processand facilitates reporting and communicationbetween the shipyard and RINA

A user-friendly interface andthe opportunity to receive specific trainingfrom senior RINA engineers ensure thatintegration of Leonardo into the shipyard’sdesign team is smooth and fast

Early identification of critical areareduces the risk of delay during the drawing approval phase and construction

for the shipowner:

Added value for the shipand assignment of the additional classnotation STAR HULL NB

Creation of a Finite Element Model for structural maintenance managementand assignment of the additional classnotation STAR HULL

Benefits

Additional FeaturesLeonardo Hull 2-D

Leonardo Hull includes a two-dimensional structuralanalysis tool, which helps the designer from the very firststages of hull structure definition.The surveyor, thanks to intuitive and complete graphics,can assign those scantlings complying with the RINARules - including fatigue checks - to the main structuralelements (plates and stiffeners for the ship’s sectionsand transverse bulkheads) in a simple and safe way.

The program includes some specific calculationcapabilities, such as structural verification in ultimatestrength conditions and torsion checks of ships withlarge deck openings, as in the case of container ships.

The data in the 2-D version are directly imported in the3-D module to facilitate rapid construction of theFinite Element Models.

Leonardo Hull is a software applicationdirectly linked to RINA Rules for thestructural analysis of ships by means ofdirect calculations.The 3-D module of LEONARDO HULLperforms a finite element analysis ofship structures which provides visualfeedback of hull capability, includinga fatigue check of structural details.

During the ship’s life-cycle, LeonardoHull supports a programme of plannedmaintenance management based onthe programmed up-dating of hullscantlings in accordance with surveymeasurements, thereby facilitating theaccurate prediction of corrosion ratesand steel renewal dates.

Leonardo software is released through RINA

Marine member area. Please visit our web site

at the following link: www.marine.rina.org

Ease of use

The use of 3-D graphics makesmodelling easier for the user. The terminology, graphics and datarequested accord perfectly with thegeneral design process. The Leonardo Hull Finite Elementmodeller has been designed with theship structure in mind.It includes specialised features for themodelling of structures such asbulkheads, stools, trunks, specificallytailored for ship design.


The Leonardo Hull

software application

has been designed

with the ship

structure in mind, thus

according perfectly

with the general

design techniques.

Throughout the modelling and evaluationprocess the user is allowed completefeed-back on, and control of, the entereddata by means of visual checks on thescantlings, and overall checks on dataconsistency across the entire model.

Time-to-Model

The objective of the software is toallow the user to perform a structuralanalysis over the entire cargo area ofthe ship. This is accomplished by usingautomatic generation of loads, easyediting of structural properties evenfor large parts of the structure, easydetection of user mistakes, andautomatically performed Rule checks.

FEM Analysis

The FEM analysis of a ship model isperformed via a two-stage approach,according to the requirements of theRINA Rules.

1st stage:

a comprehensive, three-dimensionalanalysis of a hull portion extended over 3cargo tank lengths, through a “coarsemesh” model.

2nd stage:

a more detailed check of the hull areasidentified during the comprehensivethree-dimensional analysis as thosesubjected to the highest stress levels. These areas are further analysed througha more finely meshed 3-D model.

Finer meshes are automaticallygenerated, and the same modellingfeatures are used for both coarse andfine meshes. Calculations are based on the MSC-NASTRAN™ solver, which is used andendorsed by many shipyards and is fullyintegrated into the Leonardo system.

Additional FeaturesBulk Carrier Safety

Specifically for bulk carriers, RINA has produced theBulk Carrier Safety software application, which isdesigned to assess the structural strength of a ship forany defined loading condition and cargo distribution incompliance with IACS Unified Requirements, and withSOLAS requirements.This program is designed to produce the optimal designor refitting solution in a quick and user-friendly way.


RINA guidelines


There is a demand from the shippingindustry for the construction of more robustships taking into account factors that maysignificantly affect the structural behaviourof a vessel during her whole life cycle.(e.g. design loads conditions, actual hullgirder and local loads, long-term effects suchas corrosion and fatigue, ultimate hull girderstrength in damaged conditions)

RINA guidelines for the Structural Designtake into account those factors at thedesign stage.


Post-Processing

The post-processing of results isperformed according to the latestversion of the RINA Rules.Post-processing includes the usualanalysis of results obtained, such asnodal displacement and element stress.

Moreover, stresses acting on modelelements are checked according to thefollowing RINA Rules strength criteria:

yielding buckling fatigue of structural details

Special features are provided for thereassessment of ships in service,

including analysis of corrosion rates,calculation of renewal thickness andprediction of steel renewal dates foreach structural element.

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www.rina.org

[email protected]. +90 216 5715400





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RINA S.p.A. head office via corsica, 12 16128 genova italy

ph. +39 010.5385.664 fax +39 010.5351.543 [email protected]

RINA: more than 140 years of service to the marine industriesRINA is one of the oldest classification societies in the world. It is a joint stock company in charge of the operational activities of thefoundation Registro Italiano Navale, a private, non-profit-making institution established in Genova by a group of shipowners andunderwriters in 1861. At present, RINA is authorised to act on behalf of the Italian Administration in accordance with EU directive 94/57and by approximately 70 other flag administrations.

Lifetime ServiceThe experience, technical knowledge and professionalism accumulated over the years enables the RINA Group to offer the maritimeindustries, in addition to standard classification and certification activities, a wide range of technical assistance services. M

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leonardo hull ship structural analysis

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