© Copyright QinetiQ Limited Introduction to Paramarine: Hull Generation Advanced Hullform Generation within Paramarine

© Copyright QinetiQ Limited 2009 Hull Generator Paramarine is a design system for ships and submarines which provides the Naval Architect with many tools for initial design and through-life support. A hullform definition system based on multiple surface patches has far greater capacity to model the complicated shapes of modern hullforms. Paramarine has an embedded solid modeller which can sew together a number of surface patches to form a solid hullform. Paramarine now has a native hullform definition system for shaping a multi-patch hull. This presentation describes the development of an innovative surface design tool known as Hull Generator to provide this multi-patch hullform system.

© Copyright QinetiQ Limited 2009 Hull Generator: 3 Contents of this presentation Key Features Requirements Overview Hullform Synthesis Hullform Surface Analysis Examples

© Copyright QinetiQ Limited 2009 Hull Generator: 4 Contents of this presentation Key Features Requirements Overview Hullform Synthesis Hullform Surface Analysis Examples

© Copyright QinetiQ Limited 2009 Hull Generator: Key Features 5 Rapid and accurate surface generation Flexibility to model complex free-form geometry Intuitive Graphical User Interface Ability to create parametric surfaces & hull forms Quickly adjustable

© Copyright QinetiQ Limited 2009 Hull Generator: 6 Contents of this presentation Key Features Requirements Overview Hullform Synthesis Hullform Surface Analysis Examples

© Copyright QinetiQ Limited 2009 Hull Generator: Requirements 7 User Requirements -Ease of use -Flexibility -Robust -Parametric -Importing Images Software Requirements -Surface checks -Degeneracy -Construction of sheet or solid bodies -Knot vector, control point weights -Paramarine object design

© Copyright QinetiQ Limited 2009 Hull Generator: Example Designs 8 Yacht hull and upperworksTanker hull

© Copyright QinetiQ Limited 2009 Hull Generator: 9 Contents of this presentation Key Features Requirements Overview Hullform Synthesis Hullform Surface Analysis Examples

© Copyright QinetiQ Limited 2009 Define shape driving curves Hull Generator:

© Copyright QinetiQ Limited 2009 Define shape driving curves Insert curves as necessary to provide accurate definition of surface Hull Generator:

© Copyright QinetiQ Limited 2009 Define shape driving curves Insert curves as necessary to provide accurate definition of surface A surface can then be created Hull Generator:

© Copyright QinetiQ Limited 2009 Define shape driving curves Insert curves as necessary to provide accurate definition of surface A surface can then be created And ultimately a solid Hull Generator:

© Copyright QinetiQ Limited 2009 Hull Generator: 14 Contents of this presentation Key Features Requirements Overview Hullform Synthesis Hullform Surface Analysis Examples

© Copyright QinetiQ Limited 2009 Hull Generator: XT Curves Constraints 15 bead copy interpolate knuckle interpolate straight

© Copyright QinetiQ Limited 2009 XT Curves – Structure Specifies how other curves Adjoin this one: Not defined Knuckle X,Y, or Z Normal to curve Parallel to curve Used to force curve into an orthogonal plane.Choice: { None | X | Y | Z } Miscellaneous settings Rules for the behaviour of individual points within the curve. List of 0 or more items: Bead, Copy, Interpolate, Knuckle, Straight Individual points defining curve shape XT_Curve Options Location Constraints Points Tangent

© Copyright QinetiQ Limited 2009 Graphical User Interface Other features: Orthogonal Grids to assist in placing points Snapping of points to other points, curves and the Grid Graphical adding and inserting of points Visual feedback on the type of point being added or inserted (copy / bead / absolute position) Special-purpose toolbar to speed up the definition process As well as a graphical view, XT Curves have: a tree view and an alternative tabular view

© Copyright QinetiQ Limited 2009 Choice: {Coons / linearBezier |Coons / cubic Bezier | bicubic Bezier |Gregory } One Surface Object for each patch generated by the XT_Surface One pointer for each XT_Curve that will define the interior of the surface One pointer for each XT_Curve that will form the boundary of the surface XT Surfaces – Structure XT_Surface Patches Type Boundary Curves Pointers to XT_Curves B-Spline Surface Objects Internal Curves

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XT Surfaces – Surfacing Approaches

© Copyright QinetiQ Limited 2009 Hull Generator: XT Surfaces – Subdivision Regular SubdivisionIrregular Subdivision

© Copyright QinetiQ Limited 2009 Hull Generator: 23 Contents of this presentation Key Features Requirements Overview Hullform Synthesis Hullform Surface Analysis Examples

© Copyright QinetiQ Limited 2009 Hull Generator: Shape Analysis – Surface Colouration

© Copyright QinetiQ Limited 2009 Hull Generator: Shape Analysis – Curvature Lines Curvature Lines for Section Curves Curvature Lines for an individual XT Curve

© Copyright QinetiQ Limited 2009 Hull Generator: Diagnostics Edges, vertices, vertex normals and face polygons Edge normals following subdivision

© Copyright QinetiQ Limited 2009 Hull Generator: 27 Contents of this presentation Key Features Requirements Overview Hullform Synthesis Hullform Surface Analysis Examples

© Copyright QinetiQ Limited 2009 Hull Generator: Examples

© Copyright QinetiQ Limited 2009 Hull Generator: Parametric Concept Design - Surface Ship Initial shape of a parametric hull

© Copyright QinetiQ Limited 2009 Hull Generator: Parametric Concept Design - Surface Ship The same hull after modifying transom width, flare, and parallel midbody

© Copyright QinetiQ Limited 2009 Hull Generator: Parametric Concept Design - Submarine Complex Curvature

© Copyright QinetiQ Limited 2009 Hull Generator: Parametric Concept Design - Submarine Complex Curvature Parametrically adjustable

© Copyright QinetiQ Limited 2009 Hull Generator: Parametric Concept Design - Submarine Complex Curvature Parametrically adjustable High Quality Solids

© Copyright QinetiQ Limited 2009 Hull Generator: Parametric Concept Design - Submarine Complex Curvature Parametrically adjustable High Quality Solids High Accuracy in Analysis

© Copyright QinetiQ Limited 2009 Hull Generator: Parametric Concept Design - Submarine Complex Curvature Parametrically adjustable High Quality Solids High Accuracy in Analysis Quickly adjustable Design Change Impact Assessment

© Copyright QinetiQ Limited 2009 Hull Generator: Recreation of existing designs Offset DataBitmaps located in 3D space

© Copyright QinetiQ Limited 2009 Texture maps Import pictures into graphics pane Scale, rotate or shear Set picture datum Pictures are orthogonal on graphics pane Sketch around pictures and save hours © Earthrace

© Copyright QinetiQ Limited 2009 Hull Generator: Earthrace Case Study World record circumnavigation of the globe Modelled in Paramarine from internet imagery to prove capability Analysed in HYDRODYNA (Hydrodynamic software) by Frazer-Nash Consultancy

© Copyright QinetiQ Limited 2009 Earthrace Case Study

© Copyright QinetiQ Limited 2009 Analysed in HYDRODYNA (Hydrodynamic software) by Frazer-Nash Consultancy

© Copyright QinetiQ Limited 2009 Hull Generator: Is this the end of the Story? Solid Body hull forms can be analysed using the full extent of Paramarine naval architecture modules Hull forms can be exported to external programs for further analysis, HYDRODYNA/CFD, Abaqus CAE, Fredyn, FORAN etc Hull Form Generation Stability and Hydrostatics Structural Analysis Modelling Powering Parasolid Design for Production Early Stage Design Manoe- uvring Radar Cross Section Blast & Fragmentation Endurance Seakeep- ing Ultimate Strength Pressure Hull Strength

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© Copyright QinetiQ Limited 2009 Design Cycle Customer Requirements Structural Definition Seakeeping Radar Cross Section Manoeuvring Initial Hullform Design Refinement of Hullform Design For Production

© Copyright QinetiQ Limited 2009 Effective Design Process Management Ability to represent requirements and functions and evaluate suitability using physical engineering attributes Requirements Solutions What it does!How it does it! User Customer Requirements