Geometric Modeling of the Hull Form Summary

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IntroductionBeginning: CAM Systems• The need to prepare geometrical models of the ship hull began in the1950s with the introduction of the numerically control in the platecutting equipment of the shipyards• The requirements of accuracy associated with the manufacturingprocess demands mathematical bases capable of complying with thespecific shape characteristics of the ship’s hull• With the increasing power of the computers came the evolutions from2D to 3D domain, from curves representations to surfacerepresentationsM.Ventura Hull Form Geometric Modelling 42
From CAM to CAD• With the continuous increase in capacity and availability of thepersonal computers the interactive systems became more appealing• The human interfaces also have improved both in the hardware(mouse, digitizers, track balls, gloves) and in the software aspects(windows, menus, dialog boxes, icons)• The hull modeling systems have started to be used not only formanufacturing but also in the early stages of ship design• First system were only concerned with the description of the hull forthe purpose of basic naval architecture computations• The next step was the concept design of the hull shapeM.Ventura Hull Form Geometric Modelling 5Classification of Methods by Objective• Development of a new hull– Application in the basic design of the ship– Global restrictions (displacement, form coefficients, LCB, etc.)– More freedom for the design of local shape• Representation of an existing hull– Application in ship repair– Necessary to respect a set of local restrictions– Supply information to the workshops for the cut and forming ofplates and stiffenersM.Ventura Hull Form Geometric Modelling 63
Page 1: Geometric Modeling of the Hull Form
Page 6: Hull Form Representation Methods (3
Page 10 and 11: Curves Model (Wireframe)Requisitos
Page 12 and 13: Guidelines for Work Sequence (2)•
Page 14 and 15: Guidelines for Work Sequence (6)•
Page 16 and 17: Deck Surface Generation (1)Profile
Page 18 and 19: Thruster Tunnel Modeling (2)Trim cy
Page 20 and 21: RoPax VesselM.Ventura Hull Form Geo
Page 22 and 23: Bibliography (3) Submanian, V.A. an
Page 24 and 25: Circular Arcs• Draw arc• Create
Page 26 and 27: Annex C. Guide for Lab ClassesTask
Page 28 and 29: Task 1. From Curves to Surfaces (3)
Page 30 and 31: Task 1. From Curves to Surfaces (6)
Page 32 and 33: Task 2. Modeling Specific Areas•
Page 34 and 35: Task 4. From Main Curves to Surface
Page 36 and 37: Generating the Surfaces (2)Sweep th
Page 38 and 39: Getting the Lines Plan - SectionsDe
Page 40 and 41: Creating the Drawing in AutoCad (1)
Page 42 and 43: Aligning the Views in AutoCad (3)Do
Page 44 and 45: Rhinoceros 3D (2)• Surface creati
Page 46 and 47: AutoShip v8.0• www.autoship.com (
Page 48 and 49: Ficheiro de para PreFitThe format
Page 50 and 51: Pilot3D v1.222 (1)• www.pilot3d.c
Page 52 and 53:
ShipConstructor• www.shipconstruc
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Geometric Modeling of the Hull Form Summary

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