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See detailAssessment of corrosion resistance, material properties, and weldability of alloyed steel for ballast tanks
De Baere, Kris; Verstraelen, Helen; Willemen, Remke et al

in Journal of Marine Science & Technology (2016)

Ballast tanks are of great importance in the lifetime of modern merchant ships. Making a ballast tank less susceptible to corrosion can, therefore, prolong the useful life of a ship and, thereby, lower ... [more ▼]

Ballast tanks are of great importance in the lifetime of modern merchant ships. Making a ballast tank less susceptible to corrosion can, therefore, prolong the useful life of a ship and, thereby, lower its operational cost. An option to reinforce a ballast tank is to construct it out of a corrosion-resistant steel type. Such steel was recently produced by POSCO Ltd., South Korea. After 6 months of permanent immersion, the average corrosion rate of A and AH steel (31 samples) was 535 g m−2 year−1, while the Korean CRS was corroding with 378 g m−2 year−1. This entails a gain of 29 %. Follow-up measurements after 10, 20, and 24 months confirmed this. The results after 6 months exposure to alternating wet/dry conditions are even more explicit. Furthermore, the physical and metallurgical properties of this steel show a density of 7.646 t/m3, the elasticity modulus 209.3 GPa, the tensile strength 572 MPa, and the hardness 169HV10. Microscopically, the metal consists of equiaxed and recrystallized grains (ferrite and pearlite), with an average size of between 20 and 30 µm (ASTM E 112—12 grain size number between 7 and 8) with a few elongated pearlitic grains. The structure is banded ferrite/pearlite. On the basis of a series of energy dispersive X-ray spectrometer measurements the lower corrosion rate of the steel can be attributed to the interplay of Al, Cr, their oxides, and the corroding steel. In addition, the role of each element in the formation of oxide layers and the mechanisms contributing to the corrosion resistance are discussed. [less ▲]

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See detailOptimization of Shipyard Space Allocation and Scheduling using Heuristic Algorithm
Caprace, Jean-David ULg; Petcu, Cristian ULg; Velarde, Marco et al

in Journal of Marine Science & Technology (2013), 18(3), 404-417

In this paper we describe the development of a tool that allows planners to efficiently and effectively plan space within valuable areas of a shipyard. Traditionally, space is considered as resource ... [more ▼]

In this paper we describe the development of a tool that allows planners to efficiently and effectively plan space within valuable areas of a shipyard. Traditionally, space is considered as resource; however, it is difficult to accurately account for and plan its consumption with the current planning software tools available. The spatial scheduling tool described in this paper can be used by planners to manually or automatically reserve space within the shipyard for construction of large blocks over the entire ship erection period. The software is coupled with a heuristic optimization solver which is inspired by an algorithm used for "3D bin-packing problems". The result is the ability to efficiently generate and compare multiple space allocation alternatives in a reduced time with the ultimate goal of maintaining the critical ship erection schedule. Better solution than manual or semi-automatic allocation of blocks can be obtained through the optimization module. [less ▲]

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See detailTowards a Short Time "Feature-Based Costing" for Ship Design
Caprace, Jean-David ULg; Rigo, Philippe ULg

in Journal of Marine Science & Technology (2012), 17(2), 216-230

Cost is perhaps the most influential factor in the outcome of a product or service within many of todays 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 todays 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 vital to find the best pricefunction compromise for the ship projects. The authors have developed a Feature-Based Costing (FBC) model for cost effectiveness 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. [less ▲]

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See detailShip Complexity Assessment at Concept Design Stage
Caprace, Jean-David ULg; Rigo, Philippe ULg

in Journal of Marine Science & Technology (2011), 16

A innovative complexity metric has been introduced in this paper and provides a solution to compare similar or different ship types and size together at the contract design stage. The goal is to provide ... [more ▼]

A innovative complexity metric has been introduced in this paper and provides a solution to compare similar or different ship types and size together at the contract design stage. The goal is to provide the designer with such information throughout the design process so that an efficient design is obtained at the first design run. Application and validation on a real passenger ships have shown that a significant correlation between the error of an engineer’s judgement of omplexity and the cost assessment error can be obtained. It follows that this tool could be used to improve the knowledge of ship’s complexity at the contract design stage or even to try to optimise their design if the complexity criteria are not fixed by the shipowners. [less ▲]

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