Integrated Naval Architecture &


from being a hassle-free task. Owners and operators need to consider factors such as: the size of the vessel, and whether it is heavily ballast-dependent; the amount of power that the BWT systems will consume (an amount that can be high for some of the UV disinfection systems); life cycle costs, including the necessity for repeat purchases of chemicals and spare parts, and how readily these accessories are available; and tank holding times, with some systems on the market requiring 24 hours to complete the ballast water disinfection process.


hydrodynamic losses and to improve the suction performance of pump impellers through direct coupling of TURBOdesign-1 with multi-objective genetic algorithms (MOGA). In a recent case TURBOdesign-1 and


Scan and analyse However, one of the prime considerations is that of space, and how to get the system on the vessel in the first place. As Goltens Green Technologies, a subdivision of


the 3D inverse design methodology, made it possible to perform 3D multi-objective optimisation with as few as six design parameters. Te evaluation of each configuration was also extremely rapid as performance objectives and constraints were directly computed from the output of the inverse design method (3D pressure or velocity field and geometry data). Te proposed approach can be used


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to automatically explore large parts of the design space and to create impeller or diffuser designs that meet contrasting requirements relating to efficiency, suction performance, manufacturing limitations, mechanical constraints or cost. A detailed Pareto front indicating the trade-off between contrasting objectives can


also be generated in a few hours on a normal desktop computer. In the design of many propulsors, and multi-objective


contrasting HULL MODELLING


Trimmed NURB surfaces, fairness indicators, developable surfaces, parametric variation & high accuracy


performance parameters need to be optimised at various operating points. This type of design is usually very time-consuming if trial and error approach is used. TURBOdesign-1 coupled with design of experiments method (DoE), response surface modelling (RSM) and MOGA provides an efficient and effective means of performing this type of multi-point/ multi-objective design. Since the design parameters in


MAXSURF


STABILITY, STRENGTH & PERFORMANCE Hydrostatics, longitudinal strength, intact & damaged stability, custom stability criteria, resistance prediction & seakeeping


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Stiffener paths, frame generation, deck generation, plate forming, plate development, parts database & export to ShipConstructor


TURBOdesign-1 are flow-related, the objective function relating the performance parameters to design parameters has a relatively simple mathematical expression. As a result it is possible to obtain accurate response surface models with less computational effort. The MOGA is then performed on the response surface


claims that incorporating laser scanning into the measuring phase, and relying on 3D modelling tools, can result in a greater accuracy than any other BWT system installation method. Speaking at Europort 2011, Jurrien


Integrated Naval Architecture & Ship Construction Software


Baretta, business development manager at Goltens Green Technologies, said:


ship maintenance specialist Goltens, argues, the piping required for the BWT system can oſten take up more space than the actual unit itself. Te old-fashioned method is to measure the installation area manually, before prefabricating the unit and its components to fit the space, as onboard prefabrication simply absorbs too much time, unless the process is conducted while the vessel is off-hire or in drydock. However, Goltens Green Technologies


Ship Construction Software Maxsurf is a completely integrated suite of design, analysis and construction software suitable for all types of vessels. All modules feature a consistent, graphical interface, work from a common database, and provide data exchange with AutoCAD, Microsoft Office and ShipConstructor. Contact us for a demo CD or download from -


which results in substantial reduction in computational time comparing to conventional optimisation approach based on geometrical parameterisation. In addition to the above features,


www.formsys.com


currently involved in an industrial consortium with Engineous Japan for the development of an integrated design environment where TURBOdesign Suite is coupled with DoE, RSM and MOGA. Tis methodology, which will be available in TURBOdesign Suite in late 2009, will allow rapid development of new know-how in terms of optimum blade loading for multi-objective and multi-point applications. SBI


can reduce the likelihood of prefabricated BWT systems and their components being ‘out’, even if by just a number of centimetres, which could lead to further delays and costs. In addition to retrofits, laser scanning and 3D modelling can also benefit owners awaiting newbuilds, as Baretta argued: “Another advantage is that, if owners are having a series of sister ships built, they can transfer the stored 3D details to the forthcoming vessels, saving them from having to conduct the laser measuring process all over again.” SBI


International: info@formsys.com Tel: +61 8 93351522 Fax : +61 8 93351526


UK: Island Computer Systems peter@islandcomputers.co.uk Tel : +44 1983 827100 Fax +44 1983 521608


TURBOdesign Suite version 3.1 offers seamless integration to existing CAD/ CFD and general CAE systems with direct import/export of existing design databases into the TURBOdesign Suite environment, analysis of the blade loading of existing geometries with a Quasi3D solver and direct design capabilities. Advanced Design Technology is


“Engineers can spend five to eight hours with a laser camera, scanning a certain area, perhaps in shiſts. Te captured data is then fed into a 3D computer model, allowing the ship owner to compare different installation options.” In this way, she argued, shipowners


creating seaworthy software www.autoship.com


Stability & Strength Assessment Cargo Management & Load Planning Ship Design & Production World-Wide Service & Support


Why go anywhere else? Af Pag(175x132)FORAN2009 26/1/09 12:56 Page 1 C M Y CM MY CY CMY K Ship & Boat International January/February 2012 Ship & Boat International September/October 2009 39 29


Feature 3 Feature 3


Version 13 Autofit to offsets,


reporting to Word & more


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