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In this paper, an industrial application of CAD is presented, which concerns the measurement and re-engineering of the shape of a complete ship hull and of ship's parts, which is a frequently recurring task in the shipbuilding and ship repair sector. In order to choose the most appropriate measurement method, several typical aspects of our object of measurement, such as its size, possible obstructions and poor accessibility, have to be taken into consideration, and we concluded that photogrammetry would be the most flexible method. One of the considerations in this respect was that with photogrammetry not only the 3D geometry can be measured, but that also topological properties will implicitly be taken into account, thanks to the fact that a human is interpreting and processing the photos. So a re-engineering system was developed, which consists of two major parts: the shape processing software and the photogrammetric measurement, which are tightly coupled. This system has proved to work fine for large-scale 3D objects, however, additionally, from the ship repair practice the question arose for the measurement of flat construction elements. For this purpose, an alternative and much simpler system was developed, strictly aimed at the measurement and further processing of flat steel parts. For both methods, the practical applications and best practices are presented and discussed, and a tentative economical evaluation has been composed which shows that the proposed method is cost-effective. Finally, the general conclusion is drawn that the proposed photogrammetry-based system is quite versatile and applicable, although there are also points of concern or attention, such as the required space around the object, the aspect of sufficient light and visibility, camera calibration and the required skills of the users. The proposed method could benefit from further research in areas such as the optimal placement of a minimum number of landmarks and integration of laser-sensing and photogrammetry. © 2010 Elsevier Ltd. All rights reserved. Source

Bons A.,MARIN Maritime Research Institute Netherlands | Koelman H.J.,SARC BV | Oers B.J.V.,NL MOD | Takken E.H.,NL MOD
RINA, Royal Institution of Naval Architects - International Conference on Computer Applications in Shipbuilding 2011, Papers | Year: 2011

This paper reviews the state-of-the-art Innovera design platform by means of a conceptual naval ship design case. The platform is a result of the three-year Dutch Maritime Innovation Platform project Innovero, which improves conceptual ship design by enabling the early stage application of advanced prediction tools. The major components of this system are discussed in this paper. The first is the Innovero Design Server, which enables concurrent use of design tools and knowledge in discipline-oriented knowledge systems or 'agents'. The second component is a method for the modelling of the internal geometry of the ship. This tool bridges the duality between volumes (spaces, compartments) and planes (bulkheads, decks). Both components were tested by The Defence Materiel Organisation to enable early stage assessment of intact and damaged stability, a crucial design driver for warships. The application illustrates how it improves the quality of the conceptual design process and reduces time-to-market for new designs. ©2011: The Royal Institution of Naval Architects. Source

Keelman H.,SARC BV | Van Der Zee J.,Conoship International | De Jonge T.,Numenek Centrum Oroningcn B.V.
RINA, Royal Institution of Naval Architects - International Conference on Computer Applications in Shipbuilding 2015, ICCAS 2015 - Papers | Year: 2015

This paper describes a ship design system originating from a collaborative effort in the Netherlands. Arising from a 2008-2011 I)utch development program, a pilot case was implemented where a general CAD program (Eagle, as used by Conoship) collaborated with a specific ship design program (PIAS by SARC). In 2013, this experiment was further enhanced by adding a CAI system (NUPAS-CADMATIC by NCG) into the loop. The paper explains the background, the results and envisioned future. Our experience indicates that coupling dedicated software packages is a better strategy than trying to develop monolithic "one code fits them all" ship design software. Or in shoit cooperation beats integration. © 2015: The Royal Institute of Naval Architects. Source

De Koningh D.,SARC BV | Koelman H.,SARC BV | Hopman H.,Technical University of Delft
Journal of Ship Production | Year: 2011

Conventionally, the rooms and spaces of a ship are either modeled as volumetric entities, or with the aid of bulkheads and decks. According to our knowledge, no simple representation exists where both entities can be modeled independently, and where automated conversion from one view (volumetric) to the other (planes) is possible. This paper introduces a simple yet effective approach, where a ship designer can mix the use of volumes and planes in any fashion. Furthermore, this modeling method is applied in a novel tool to manage ship subdivision constraints. As quite a few numerical constraints are known a priori, they can be defined in a list and assigned to specific subdivision elements. Examples are bulkhead locations or required tank volumes or deck areas. A constraint management tool is developed that evaluates the ship layout design during the design process. The designer will be able to modify or add constraints, and the tool will support the designer by managing these constraints during the design process. If the hull form changes, all submitted rules will be updated according to the new main particulars. If one of the constraints does not comply, an adjustment or alternative can be chosen at that moment and the impact of this change is directly visible. The designer can also ask the tool to provide a ship layout design that complies best with the constraints entered. When the Constraint Management program is used, a feasible ship compartment design can be made in a quick manner and the designer is kept from making errors. This means that a correct ship layout model is available on which probabilistic damage stability calculations and weight estimations can be performed in an early stage. This method has been implemented in a computer program, so actual design examples are discussed. Source

Veelo B.,SARC BV | Koelman H.,SARC BV
Ship Technology Research | Year: 2011

There is a limit to how far an application program can evolve in incremental steps. At some point in time, progression requires radical changes: a new generation that parts with the limitations of its legacy. In our case, due to richness in features, a complete rewrite of our hull design software would lead to an unattractively long down-time, which is why we have pursued a more efficient allocation of our programming resources. This is the report of an approach in which we keep both the production version and the development version fully functional within the same executable, providing a non-disruptive transition from one application generation to the next, while building on proven foundations. Source

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