References of "Toderan, Catalin"
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See detailNew and Updated Modules to Performed Stress and Strength Analysis
Zanic, V.; Jancijev, T.; Andric, J. et al

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

Report about IMPROVE FP6 EU project

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See detailStructural Optimization of a 220 000 m³ LNG Carrier
Toderan, Catalin; Guillaume Combecave, Jean-Louis; Boukaert, Michel et al

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 ▲]

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See detailLeast Cost Optimization of Large Passenger Vessels
Richir, Thomas; Caprace, Jean-David ULg; Losseau, Nicolas ULg et al

in Ships & Offshore Structures (2007), 2

The LBR-5 software allows optimizing ship structures according to objectives of higher inertia, less weight and/or lower cost. This last criterion offers the choice between two approaches of calculation ... [more ▼]

The LBR-5 software allows optimizing ship structures according to objectives of higher inertia, less weight and/or lower cost. This last criterion offers the choice between two approaches of calculation. The first approach is based on a simplified assessment of the cost in which the total cost is described by rather simple analytical functions which bring into play on the one hand the design variables and on the other hand empirical parameters. In the second approach, the calculation of the cost is based on data specific to the shipyard. The material cost is analyzed according to the first approach while the cost of the labor considers each relevant operation of the ship building with respect to the LBR-5 model. A survey of all the tasks was carried out at Aker Yards France, and a thorough study made it possible to develop assessment tools of the labor cost for each operation as functions of the design variables. Plate straightening operations are also considered in this analysis. This paper presents a cost-based optimization study carried out on a large passenger ship structure with more than 600 design variables, by the use of the detailed approach for the cost calculation. The structural model has been formulated on the basis of technical documentation prepared by Aker Yards France. The loads and strength criteria applied on the model are considered according to classification society rules (Bureau Veritas). Results and conclusions of the study are presented. [less ▲]

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See detailIntegration of a Bottom-Up Production Cost Model in LBR-5 Optimization Tool
Toderan, Catalin; Pircalabu, Eugen ULg; Caprace, Jean-David ULg et al

in Conference on Computer Applications and Information Technology in the Maritime Industries (COMPIT) (2007, April)

The LBR-5 software allows the optimization of ship structures following different objectives as the highest inertia, least weight and/or least cost. The interest of European shipyards to optimize the ship ... [more ▼]

The LBR-5 software allows the optimization of ship structures following different objectives as the highest inertia, least weight and/or least cost. The interest of European shipyards to optimize the ship structure is basically related to the production cost and mainly to the labor cost. In order to increase the quality of cost estimation, a bottom-up module has been developed by University of Liege in partnership with AKERYARDS France. This module has been validated on different types of ships (LNG, Cruise Vessels, Fast Ferry) and integrated in the LBR-5 optimization process. The bottom-up cost module has two important goals. The first one is to estimate accurately the labor cost of a given ship structure taking into account the production breakdown, the block splitting sequence and all the individual operations required by the fabrication process. The second one is to compute properly the sensitivities of the design objective (construction cost) related to the design variables (scantlings). The paper also presents the results of a validation test on a large passenger vessel. The effect of the bottom-up cost module on the optimal scantling and on the cost gain is highlighted through a comparison with the results obtained using a basic cost module. [less ▲]

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See detailLeast cost optimization of a large passenger vessel
Richir, Thomas; Losseau, Nicolas; Pircalabu, Eugen et al

in International Conference on “Advancements in Marine Structures”, (Proceedings of MARSTRUCT’2007), Edt Guedes Soares & Das, Publ: Taylor & Francis Group, UK, 12-14 March 2007 (2007, March)

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See detailAssessment of Ultimate Bending Moment of Ships from a Reliability Point of View, Using Independent Perturbations Method
Toderan, Catalin; Richir, Thomas; Caprace, Jean-David ULg et al

in Network for Integrating Structural Safety, Risk and Reliability (ASRANet) (2006, July)

This paper presents a method to asses hull girder ultimate bending moment distribution, taking into account parameters uncertainty. This method is a part of a research activity carried out at University ... [more ▼]

This paper presents a method to asses hull girder ultimate bending moment distribution, taking into account parameters uncertainty. This method is a part of a research activity carried out at University of Liege. The method is able to compute four statistical moments of ultimate strength distribution: average, standard deviation, skewness and kurtosis. Geometry parameters, material parameters and initial imperfections (initial deflections and residual stresses) are considered as random variables and a distribution is associated to each of them. Ultimate bending moment algorithm is a progressive collapse analysis based on Smith method and associated with the load-end shortening model proposed by Bureau Veritas and Joint Bulker Project Rules (JBP). In order to perform a reliability analysis, this algorithm is coupled with independent perturbations method. The advantage is a lower number of simulations compared to the standard Monte-Carlo procedure and a good use of the initial information that is available. The paper contains also a comparative analysis between the presented method and a linear sensitivity analysis performed by the ISSC 2000 “Ultimate Strength” committee for a VLCC structure. [less ▲]

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See detailUltimate Strength of Stiffened Panels Assessment Taking Into Account Model Uncertainty
Toderan, Catalin; Richir, Thomas; Caprace, Jean-David ULg et al

in Proceedings of OMAE2006 (2006, June 04)

This paper presents a methodology to take into account model uncertainties related to the load-end shortening curve of stiffened panels. This method is a part of a research activity carried out at ... [more ▼]

This paper presents a methodology to take into account model uncertainties related to the load-end shortening curve of stiffened panels. This method is a part of a research activity carried out at University of Liège. His goal is to propose a reliability based model to assess hull girder ultimate strength using a progressive collapse algorithm. The numerical results presented here concern the load-shortening model chosen for this research, which is based on Bureau Veritas rules. Model uncertainty is quantified as a parameter considered as a random variable. Four statistical moments (mean, standard deviation, skewness and kurtosis) of this parameter are calculated and analyzed using a data-base of stiffened panels test results published in recent years. In order to increase the number of "actual" values for the statistical assessment, the data-base is completed with non-linear finite element analysis results. The paper contains also some recommendation for the implementation of the proposed method in ultimate strength reliability based analysis. [less ▲]

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See detailMARPOL Project, Madagascar
Rigo, Philippe ULg; Toderan, Catalin

Report (2003)

Recommendations pour l'application des directives MARPOL à MAdagascar. Mission d'identification.

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See detailSensitivity Analysis on Ultimate Hull Bending Moment and Multi-Criteria Comparative Analysis of Existing Method
Rigo, Philippe ULg; Toderan, Catalin; Quesnel, T.

in Conf ASRANet, Integrating Structural Reliability Analysis with Advanced Structural Analysis, Session 8 (2002, July)

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See detailDiscussion on “Ultimate Limit State Design of Ship Stiffened Panels and Grillage
Rigo, Philippe ULg; Toderan, Catalin

in SNAME’2001 Annual Meeting (2001)

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See detailLeast Cost and Scantling Optimization at the initial Design Stage of Ships
Rigo, Philippe ULg; Toderan, Catalin

in ICETECH 2000 (2000, September)

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