Task 4.0 – Subsystem Optimization of the Structure Scantling

Report (2012)

In the present report concerning Task 4.0 – Subsystem Optimization of the Structure Scantling, the structural optimization of the ship is carried out. This optimization is performed with regard to the ... [more ▼]

In the present report concerning Task 4.0 – Subsystem Optimization of the Structure Scantling, the structural optimization of the ship is carried out. This optimization is performed with regard to the objective functions and the constraints defined in Deliverables 2.0 & 3.0 [1]. Task 4.0 is divided into three parts: - The initial scantling - The load cases and loadings - The optimized scantling This report presents the results and benefits of optimization. Comments and analysis are provided throughout the report. [less ▲]

Scantling Optimization of Ship Structures Considering Fatigue at the Early Design Stage

in Amrane, Amirouche (Ed.) Scantling Optimization of Ship Structures Considering Fatigue at the Early Design Stage (2011)

ABSTRACT: Fatigue aspects are leading criterion for the scantling optimization of ships structures. LBR-5 software is an integrated package which performs, at the early design stage, cost and/or weight ... [more ▼]

ABSTRACT: Fatigue aspects are leading criterion for the scantling optimization of ships structures. LBR-5 software is an integrated package which performs, at the early design stage, cost and/or weight optimization of ships structures (scantling). This software takes into account structural constraints (yielding, buckling, displacement, ultimate strength). Until now, the fatigue failure issue was not implicitly included in the optimization loop. At the early design stage, limited information and details are available. Therefore simplified methods have to be applied. LBR-5 software provides the nominal stress, so chosen procedure uses the nominal stress and the Miner’s rule. This approach requires a library of stress concentration factors for predefined typical structural details. The goal of the present work is to develop a tool for fatigue assessment that can be integrated on LBR5 optimization process, to realize global optimization taking into account the fatigue issues. Until now, the integration of the fatigue tool is not finished. Only fatigue verification on the optimized structure is possible. On the present paper, the procedure adopted is presented and a longitudinal scantling of the mid-ship section of a LNG is optimized with LBR-5. Production cost is considered as objective functions. The optimized scantling is checked by the fatigue tool. The fatigue criterion is not respected on some panels. Corrections are performed on these panels to have an optimized scantling without fatigue problems. [less ▲]

Rapport 2010- Windsteel : développement de solutions en acier pour la construction éolienne

Report (2010)

Un logiciel appelé EOL-OS a été développé dans le cadre des WP4 et 5 du projet « Windsteel : développement de solutions en acier pour la construction éolienne ». Cet outil informatique est essentiellement ... [more ▼]

Un logiciel appelé EOL-OS a été développé dans le cadre des WP4 et 5 du projet « Windsteel : développement de solutions en acier pour la construction éolienne ». Cet outil informatique est essentiellement destiné au dimensionnement et à l’optimisation structurelle des éoliennes offshores de type monopile en acier. Toutefois, lors des développements effectués dans le courant du second semestre de l’année 2010, son application aux éoliennes onshore en acier a été rendue également possible. Ce document s’inscrit dans la continuité du rapport technique semestriel S1 de 2010. Il est laissé au lecteur le soin de se référer à ce dernier pour ce qui concerne la nomenclature utilisée pour décrire les structures étudiées ainsi que le détail des modules implémentés au terme des 6 premiers mois de 2010. La première partie du présent rapport concerne les développements effectués sur le logiciel EOL-OS et se focalise en particulier sur les modules implémentés dans le courant du semestre S2 de 2010. La seconde partie traite des résultats d’optimisation obtenus au terme des différentes simulations et tirent des conclusions générales sur le dimensionnement des structures support des éoliennes. [less ▲]

Tools for early design stage: presentation of LBR-5 Software

in Zanic, Vedran; Andric, Jerolim (Eds.) Proceedings of IMPROVE Final Workshop (2009, September)

LBR-5 is a tool for early design stage. Taking into account numerous kinds of constraints – structural, geometrical, etc. – an optimum scantling can quickly been found. In the framework of IMPROVE ... [more ▼]

LBR-5 is a tool for early design stage. Taking into account numerous kinds of constraints – structural, geometrical, etc. – an optimum scantling can quickly been found. In the framework of IMPROVE European project many new modules have been implemented to increase the quality of the optimised scantling. Mainly 6 major changes have been brought: implementation of a sloshing module, a fatigue module, a multi-structure module, a multi-materials module, a life cycle cost module and finally a vibration module. Tests to validate these modules have been carried out on the three ships studied in the IMPROVE project: a LNG, a Chemical Tanker and a ROPAX. [less ▲]

New and Updated Modules to Performed Stress and Strength Analysis

in IMPROVE Workshop (EU Project FP6 n°031382), DUBROVNIK 17-18 Sept. 2009, Croatia (2009, September)

Report about IMPROVE FP6 EU project

Structural Optimization of a 220 000 m³ LNG Carrier

in Conference on Computer Applications and Information Technology in the Maritime Industries (COMPIT) (2008, April)

This paper relates to the development of a new concept of 220.000 m³ LNG designed by AKERYARDS France. This work is performed in the framework of FP6 IMPROVE project. The first phase of the activity ... [more ▼]

This paper relates to the development of a new concept of 220.000 m³ LNG designed by AKERYARDS France. This work is performed in the framework of FP6 IMPROVE project. The first phase of the activity related to the identification of stakeholder’s requirements and the definition of key performance indicators. In parallel, several calculations have been performed to test the existing tools and to evaluate the potential gain at the concept design. These activities, associated with the definition of a 220000 m³ QuatarFlex prototype, including the aspects related to the naval architecture and general arrangement, have been re-grouped in the so-called “first design loop”. The second phase concerns the development of new modules to be integrated in the optimization tools in order to satisfy the requirements defined in the first phase. The final phase will be the application of the new (improved) optimization tools for the final LNG product. We highlight that the main target will be the multi-objective structural optimization of the prototype defined by “the first design loop”. However, some feed-back concerning the naval architecture point of view could be expected in this phase. The aim of the paper is to present the results of the first phase, as well as an overview of the analyses carried out during the “first design loop”. Details about the different methodologies proposed for the second phase of the development are given. [less ▲]

IMPROVE - Design of Improved and Competitive Products using an Integrated Decision Support System for Ship Production and Operation

in COMPIT’2008, Edit. Rigo-Bertram, Univ. of Liege, Belgium, ISBN-10 2-9600785-0-0 (2008)