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AVEVA Design Reuse unlocks the accumulated value of previous design work. It allows the reuse of an entire ship design or simply parts of it. For example, you can:z create a sister ship from an existing designz create a similar ship, perhaps for a different ownerz create a similar ship, but of a different sizez start a new design using parts of previous designsz apply a standard design to a new project.An intuitive Graphical User Interface (GUI) makes this powerful new product easy to use for efficient manual copying. Command-line control opens up possibilities for innovative working methods based on the automation capabilities of AVEVA's Programming Macro Language (PML).Hull form accuracy can therefore be maintained throughout every stage of an AVEVA Marine project, ensuring high design quality in the finished vessel.When exporting, surface definitions can be exported entire, for use in third-party hydrodynamics applications, for example, or selectively for use by subcontractors. Because vessel performance depends critically on it, the precise surface definition is a high-value proprietary asset for a shipbuilder. Being able to export to subcontractors selected portions only of the hull form retains control of this valuable intellectual property.AVEVA Surface Manager can also be used as a stand-alone program for converting surfaces from one format to another. Its full range of benefits becomes apparent when used in conjunction with Hull Structural Design or Hull Detailed Design, through facilitating the checking of surfaces during the hull design process. Surface Manager provides more flexibility of choice, whether of surface creation tools, or specialist hydrostatics or Automatic space arrangement drawings Apart from increasing the scope for evaluating options at the early design stage, one of the new product's most valuable features is likely to be its ability to automatically create General Arrangement drawings defining all the various surface treatments.A great many revisions of these are often required as the design evolves, so the reduction in work and time required to update them can be significant. Generating them directly from the definitive vessel model also eliminates potential sources of error.Top: View of a source model. Below: 3D view of the data copied and updated in the target model.Example of surface definition for bulb and bow thruster.hydrodynamics analysis software. It helps increase design quality, and maximises control over one of a shipyard's most valuable intellectual assets.A general arrangement.AVEVA World Magazine 2012|Issue 139

40AVEVA World Magazine 2012|Issue 1Finite Element Analysis (FEA) is an essential tool in ship design, not only to verify the structural strength of a hull but also to meet increasingly stringent vibration criteria for qualities such as passenger comfort or environmental noise. But the man-hours required for FEA are costly. Worse, tight delivery schedules frequently make it a critical path activity and can require that construction starts before final approval of the analyses by the Classification Society, incurring an element of programme risk. Add to this the highly skilled nature of idealising a hull structure into an efficient mesh for analysis and it's easy to see why Hull Finite Element Modeller has already proved so popular.There are two leading FEA solutions used in ship design: Patran/Nastran from MSC Software and ANSYS Mechanical from ANSYS. Patran is used by roughly half of the world's shipbuilders, so this latest addition of a Patran interface to Hull Finite Element Modeller will be good news for a great many shipbuilders and their design agents.As we described in the first 2010 issue of PIPELINE magazine, Hull Finite Element Modeller is a model converter that incorporates a great deal of specialist know-how for idealising real hull structure into an optimum mesh for efficient FEA. It applies default mesh parameters and idealisations which accurately translate the majority of the true design intent at the first pass, and it allows the structural analyst to adjust these as necessary to fine-tune the mesh, for example, to increase mesh density around local 'hot spots'. Once the optimum idealisation has been configured, the new version of Hull Finite Element Modeller can now generate and export a session file using Patran Command Language (PCL) for execution in Patran. This file contains all the commands required to create a simplified geometry of the original hull model, together with material and element property definitions, within a Patran database.The success of this new interface owes much to the excellent training and support provided by MSC to AVEVA's technologists during its development and validation. AVEVA has also worked closely with selected customers during development to ensure that the enhanced product continues to support industry working practices and could be tested on real 'warts and all' project data. This focus on practicality has resulted in a solution which delivers power and ease of use for everyday needs, while avoiding the unnecessary complexities of trying to cater for every possible situation. Shipbuilders are very practical people, who understand the principle of diminishing returns and, above all, want tools that are effective and reliable.Everybody who has used Hull Finite Element Modeller has been enthusiastic about it. Shipyard managers appreciate both the direct savings and the reduction it can make in programme risk. It also goes some way to mitigating the skills shortages that the industry is suffering from. Adding direct Patran compatibility brings these benefits to a wider range of users.Meshing TogetherAVEVA Hull Finite Element Modeller adds a Patran interfaceStéphane NeuvégliseHead of Business Management - Marine Systems, AVEVA