References of "Caprace, Jean-David"
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See detailLeast Weight and Least Cost Optimisation of a Passenger Vessel
Caprace, Jean-David ULg; Bair, Frédéric ULg; Rigo, Philippe ULg

in Mathematical Modelling in Civil Engineering (2010), (2), 17-26

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made ... [more ▼]

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made to the LBR-5 software (French acronym of “Stiffened Panels Software”, version 5.0) to optimize the scantling of ship sections by considering production cost, weight and moment of inertia in the optimisation objective function. A real multi-criterion optimisation of a passenger ship is presented in this paper. Results highlight that LBR-5 is competitive software to optimise scantling of ships at very early design stage with management of critical problems studied normally at a later step of the design [less ▲]

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See detailMulti-criterion Scantling Optimisation of Passenger Ships
Caprace, Jean-David ULg; Bair, Frédéric ULg; Rigo, Philippe ULg

in 9th International Conference on Computer Applications and Information Technology in the Maritime Industries (2010, April 12)

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made ... [more ▼]

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made to the LBR-5 software (French acronym of “Stiffened Panels Software”, version 5.0) to optimize the scantling of ship sections by considering production cost, weight and moment of inertia in the optimisation objective function. A real multi-criterion optimisation of a passenger ship is presented in this paper. Results highlight that LBR-5 is competitive software to optimise scantling of ships at very early design stage with management of critical problems studied normally at a later step of the design. [less ▲]

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See detailCost Effectiveness and Complexity Assessment in Ship Design within a Concurrent Engineering and "Design for X" Framework
Caprace, Jean-David ULg

Doctoral thesis (2010)

Decisions taken during the initial design stage determine 60% to 95% of the total cost of a product. So there is a significant need to concurrently consider performance, cost, production and design ... [more ▼]

Decisions taken during the initial design stage determine 60% to 95% of the total cost of a product. So there is a significant need to concurrently consider performance, cost, production and design complexity issues at the early stages of the design process. The main obstacle to this approach is the lack of convenient and reliable cost and performance models that can be integrated into a complex design process as is used in the shipbuilding industry. Traditional models and analysis methods frequently do not provide the required sensitivity to consider all the important variables impacting performance, cost, production and ship’s life cycle. Our challenge is that achieving this sensitivity at the early design stage almost requires data available during the detail design analysis. The traditional design methods do not adequately include, early enough, production and life cycle engineering to have a positive impact on the design. Taking an integrated approach throughout the life cycle of the ship and using concurrent engineering analysis tools can improve these traditional design process weaknesses. Innovation is required in structural design and cost assessment. The use of design for X, and particular design for production and cost schemes, during the design is the solution: to reduce failure during a ship’s life caused by design misconception, to reduce the overall design time and to shorten the build cycle of ships, to enlarge the number of design alternatives during the design process. The author has developed some assessment methods for cost effectiveness and complexity measurements intended to be used by ship designers for the real time control of cost process. The outcome is that corrective actions can be taken by management in a rather short time to actually improve or overcome predicted unfavourable performance. Fundamentally, these methods will provide design engineers with objective and quantifiable cost and complexity measures making it possible to take rational design decisions throughout the design stages. The measures proposed in this PhD are based on several techniques like decision analysis, data mining, neural network, fuzzy logic. They are objective facts, which are not dependent on the engineer’s interpretation of information, but rather on a model generated to represent the ship design. The objectivity aspect is essential when using the complexity and cost measures in a design automation system. Finally, with these tools, the designers should obtain well-defined and unambiguous metrics for measurement of the different types of cost effectiveness and complexities in engineered artefacts. Such metrics help the designers and design automation tools to be objective and perform quantitative comparisons of alternative design solutions, cost estimation, as well as design optimization. In this PhD, these metrics have been applied and validated with success in real industrial conditions on the design of passenger ships. [less ▲]

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See detailCoupling Optiview and Production Simulation
Caprace, Jean-David ULg; Aracil Fernandez, Francisco ULg; Hübler, Michael et al

in Proceeding of the 16th International Conference of Ship and Shipping Research (2009, November)

This paper presents new developments to link OptiView and a Discrete Event production Simulation (DES) software. The OptiView Software, is designed to maximize the number of ship blocks and ship sections ... [more ▼]

This paper presents new developments to link OptiView and a Discrete Event production Simulation (DES) software. The OptiView Software, is designed to maximize the number of ship blocks and ship sections produced in workshops during a certain time window. We decided to combine the strong points of both, the OptiView software and the DES simulation. Indeed, the production simulation is very effective for the modelling of the movement of the gantry crane while OptiView is very powerful for the allocation of blocks and optimization of the surface. This tool was developed to support planners to improve the space utilization and workshop productivity. The combination of both methods will deliver better results for lead time and cost. [less ▲]

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See detailA Fuzzy Metric for Assessing the Producibility of Straightening in Early Design
Caprace, Jean-David ULg; Aracil Fernandez, Francisco; Losseau, Nicolas ULg et al

in The 14th International Conference on Computer Applications in Shipbuilding (ICCAS) (2009, September 01)

Since several years, the large shipyards use more and more thin plates to build up stiffened panels in order to decrease the structural weight. The major problem relating to the utilization of thin plates ... [more ▼]

Since several years, the large shipyards use more and more thin plates to build up stiffened panels in order to decrease the structural weight. The major problem relating to the utilization of thin plates is the occurrence of welding distortions that have to be eliminated for esthetical and service reasons. This straightening operation involves significant costs and it seems thus important to characterize its economical impact on the global hull fabrication. This paper presents a way to minimize cost in shipbuilding industry by the implementation of a producibility fuzzy metric in order to obtain a better knowledge of the straightening process. Attention has been focused on the definition of fuzzy rules by experts but also on the optimisation of the decision surface to reduce the error compared to actual measurement points. [less ▲]

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See detailTools for early design stage: presentation of LBR-5 Software
Rigo, Philippe ULg; Bair, Frédéric ULg; Caprace, Jean-David ULg et al

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 ▲]

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See detailProduction, Operation and Robustness Module
Caprace, Jean-David ULg; Bair, Frédéric ULg; Hübler, Michael et al

(2009, September)

Nowadays, simulation and Life Cycle Cost (LCC) assessment becomes more and more important in shipbuilding industry. In order to survive in the competitive market environment, manufacturers now have to ... [more ▼]

Nowadays, simulation and Life Cycle Cost (LCC) assessment becomes more and more important in shipbuilding industry. In order to survive in the competitive market environment, manufacturers now have to consider reducing the cost of the entire life cycle of a product, called LCC. This research was initiated with the idea of developing a methodology/framework to be able to assess the life cycle cost/earning of production and maintenance/repair with respect to the scantlings structural optimization variables to be used during the conceptual ship design stage. Three main modules as been implemented during this project: A life cycle cost/earning of production and maintenance/repair, a detailed Discrete Event Simulation (DES) for production and scheduling and a design robustness of the structural solution related to various fabrication and operational parameters. These three modules as well as the main results are briefly presented here. [less ▲]

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See detailspecialist committee V.3 entitled "Fabrication Technology" of the 17th International Ship and Offshore Structure Congress
Okada, T.; Caprace, Jean-David ULg; Estefen, S. F. et al

(2009, August)

The committee shall give an overview about new developments in the field of ship and offshore materials and fabrication techniques with focus on trends which are highly relevant for practical applications ... [more ▼]

The committee shall give an overview about new developments in the field of ship and offshore materials and fabrication techniques with focus on trends which are highly relevant for practical applications in the industry in the recent and coming years. Particular emphasis shall be given to the impact of welding and corrosion protection techniques on structural performance, on the development of lighter structures and on computer and IT technologies and tools, which are meant to link design and production tools and to support efficient production. [less ▲]

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See detailSpace Allocation Optimization Applied to Lower Hulls’ Production of Semi-Submersible Platforms
Caprace, Jean-David ULg; Marins, Cassiano; Losseau, Nicolas ULg et al

in COMPIT'09 (2009, May 10)

This paper presents a part of new developments included inside a holistic optimisation strategy during the design cycle of ships. The first part of the paper describes an algorithm to maximize the number ... [more ▼]

This paper presents a part of new developments included inside a holistic optimisation strategy during the design cycle of ships. The first part of the paper describes an algorithm to maximize the number of ship blocks and ship sections to produce in workshops during a certain time window. A tool was developed in order to support planners to improve the space utilization and workshop productivity. Thanks to this software, the scheduling is now done more efficiently and above all it takes less time. The second part of the paper describes a recent development of an algorithm able to generate a feasible blocks erection sequence starting from the blocks splitting definition. The idea is to integrate this module as a new functionality inside simulation software in order to take into account blocks sequence during the elaboration of the optimised production strategy. The two developments were validated on the lower hull of a semi-submersible platform coming from a new Brazilian shipyard. [less ▲]

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See detailMulti-Criteria Decision Support for Cost Assessment Techniques in Shipbuilding Industry
Caprace, Jean-David ULg; Rigo, Philippe ULg

in COMPIT'09, Budapest (2009, May 10)

Cost is perhaps the most influential factor in the outcome of a product or service within many of today’s industries. Cost assessment during the early stage of ship design is crucial. It influences the go ... [more ▼]

Cost is perhaps the most influential factor in the outcome of a product or service within many of today’s industries. Cost assessment during the early stage of ship design is crucial. It influences the go, no-go decision concerning a new development. Cost assessment occurs at various stages of ship design development. Economic evaluation as early as possible, in the design phase, is therefore crucial to find the best price–function compromise for the ship projects. This paper presents a Multi Criteria Decision Aid (MCDA) method in order to select an appropriate cost assessment method at each stage of the ship design. In order to compare the cost performance between all alternatives, the evaluation of each alternative is performed by PROMETHEE. [less ▲]

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See detailA Data Mining Analysis to evaluate the additional workloads caused by welding distortions
Losseau, Nicolas ULg; Caprace, Jean-David ULg; Aracil Fernandez, Francisco et al

in MARSTRUCT'09 (2009, March)

This paper presents a way to minimize cost in shipbuilding industry by using the results of a data mining analysis aiming to improve the cost knowledge of the additional operations caused by welding ... [more ▼]

This paper presents a way to minimize cost in shipbuilding industry by using the results of a data mining analysis aiming to improve the cost knowledge of the additional operations caused by welding distortions. This statistical analysis had the scope to establish assessment formulas of the supplementary workloads in function of scantlings and welding distortions. Those formulas can be useful to evaluate the profitability of new welding devices and can improve the research in the following domains: production simulation, cost assessment of ship hull, structure optimization, design for production, etc. [less ▲]

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See detailMaintenance/repair and production-oriented life cycle cost/earning model for ship structural optimization during conceptual design stage
Turan, Osman; Olcer, A. I.; Lazakis, Iraklis et al

in Ships & Offshore Structures (2009), 4(2), 107-125

The aim of this paper is to investigate the effect of the change in structural weight due to optimisation experiments on life cycle cost and earning elements using the life cycle cost/earning model, which ... [more ▼]

The aim of this paper is to investigate the effect of the change in structural weight due to optimisation experiments on life cycle cost and earning elements using the life cycle cost/earning model, which was developed for structure optimisation. The relation between structural variables and relevant cost/earning elements are explored and discussed in detail. The developed model is restricted to the relevant life cycle cost and earning elements, namely production cost, periodic maintenance cost, fuel oil cost, operational earning and dismantling earning. Therefore it is important to emphasise here that the cost/earning figure calculated through the developed methodology will not be a full life cycle cost/earning value for a subject vessel, but will be the relevant life cycle cost/earning value. As one of the main focuses of this paper is the maintenance/repair issue, the data was collected from a number of ship operators and was solely used for the purpose of regression analysis. An illustrative example for a chemical tanker is provided to show the applicability of the proposed approach. [less ▲]

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See detailOrganisation des chantiers navals
Maus, Henry; Caprace, Jean-David ULg

Learning material (2008)

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See detailContribution to the specialist committee V.3 entitled "Fabrication Technology" of the 16th International Ship and Offshore Structure Congress
Caprace, Jean-David ULg

in Borzecki, T.; Bruce, G.; Han, Y. S. (Eds.) et al Specialist committee V.3 - Fabrication technology (2008, August)

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See detailOptimization or Rolling and Floating Lock Gates
Rigo, Philippe ULg; Pircalabu, Eugen ULg; Amrane, Amirouche ULg et al

in PIANC'08 (2008, June)

This paper presents a methodology to minimize the weight of the gate by optimizing simultaneously the height of the floating tanks, the number of their watertight partitions and the gate scantling while ... [more ▼]

This paper presents a methodology to minimize the weight of the gate by optimizing simultaneously the height of the floating tanks, the number of their watertight partitions and the gate scantling while considering the floating stability (Richir et al. 2006) The rolling gate, considered for this lock, has to float to be led into the port for maintenance or repairing operations. Two partitioned floating tanks are used inside the gate. Water ballast can be pumped from the floating tanks to float the structure or to restore the mass equilibrium in case of damage due to boat impact. [less ▲]

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See detailOptiView − A Powerful and Flexible Decision Tool Optimising Space Allocation in Shipyard Workshops
Caprace, Jean-David ULg; Bair, Frédéric ULg; Losseau, Nicolas ULg et al

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

This paper presents new developments to maximize the number of ship blocks and ship sections produced in various workshops of shipyards during a certain time window. The visualization tool OptiView® was ... [more ▼]

This paper presents new developments to maximize the number of ship blocks and ship sections produced in various workshops of shipyards during a certain time window. The visualization tool OptiView® was developed to support users to improve the space utilization and workshop productivity. The software is coupled with a heuristic optimisation solver. The paper describes the approach to the space allocation problem and gives three application examples. [less ▲]

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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 detailEstimation of Welding Distortions and Straightening Workload Through a Data Mining Analysis
Losseau, Nicolas ULg; Caprace, Jean-David ULg; Archambeau, Dominique et al

in Design, Fabrication and Economy of Welded Structures (DFE) (2008, April)

This paper will present a way to minimize cost in shipbuilding industry by using the results of a data mining analysis aiming to improve the cost knowledge of the straightening process. This statistical ... [more ▼]

This paper will present a way to minimize cost in shipbuilding industry by using the results of a data mining analysis aiming to improve the cost knowledge of the straightening process. This statistical analysis was based on production data from a shipyard and has the scope to establish an assessment formula of the straightening workload. An intermediate step of the analysis was to estimate the welding distortions appearing in stiffened panels. Those generated formulae are useful to improve the research in the following domains: production simulation, cost assessment of ship hull, structure optimization, design for production, etc. [less ▲]

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See detailMulticriterion Scantling Optimization of the Midship Section of a Passenger Vessel considering IACS Requirements
Richir, Thomas; Caprace, Jean-David ULg; Losseau, Nicolas ULg et al

in The 10th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS) (2007, October)

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made ... [more ▼]

In the scantling design of a passenger ship, minimum production cost, minimum weight and maximum moment of inertia (stiffness) are conflicting objectives. For that purpose, recent improvements were made to the LBR-5 software (French acronym of “Stiffened Panels Software”, version 5.0) to optimize the scantling of ship sections by considering production cost, weight and moment of inertia in the optimization objective function. Moreover, IACS requirements regarding bending, shearing and buckling strength are currently available in LBR-5. Until now, only raw scantling optimizations were performed with LBR-5. Thanks to new developments using heuristics, it is now possible to realize discrete optimization so that a standardized and “ready to use” set of optimum scantlings can be obtained. [less ▲]

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See detailA Data Mining Analysis Applied to a Straightening Process Database
Caprace, Jean-David ULg; Losseau, N.; Bair, Frédéric ULg et al

in Ship Technology Research = Schiffstechnik (2007), 54(4), 177-183

Detailed reference viewed: 38 (4 ULg)