Innovative approach in FORAN for the definition of an early ship 3D model to generate the required outputs for class approval

2. Basic Design

The right shipbuilding CAD/CAM System

1. Initial Design

2. Basic Design

3. Hull Structure

4. Machinery & Outfitting

5. Electrical Design

6. Drafting & Mechanical CAD

7. FORAN-PLM Advanced Integration

8. Virtual Reality

9. Change & Access Control

FORAN Basic Design is a solution for the preliminary definition of a ship 3D model with the aim of obtaining the reports and drawings for the approval of class societies. FORAN addresses the basic design through its 3D powerful modelling environment, which supports a quick definition of the structural and outfitting elements in 3D, in terms of global geometry, attributes and scantling, in an extremely efficient manner. The structure model is topological, so changes introduced are automatically propagated to connected structures and to drawings. Weight calculations and gross material estimations are very useful at this stage.

Class drawings are generated automatically from the 3D model, using the FORAN drafting tools, having the advantage of the regeneration after changes in the model.

One of the key aspects of having a 3D model at this stage is the possibility to export it to FEM analysis, by means of an automatic idealization tool in FORAN that provides bi-directional communication with any FEM suite.

FORAN provides a powerful tool for the definition of intelligent P&I and single wire (electrical) diagrams, allowing quick outfitting and machinery layouts.

The transition to the detail design is smooth, as the model can be progressively broken down and detailed.

Structure Basic Design

Surface Model

FORAN Initial Design tools provides a powerful set of tools for the hull forms definition or can import them from any third party software.

Key features:

•Modificationofexistinghullforms,usingtypicalmarine transformation methods

•Modificationofhullformsfromcurves,keepingboundary conditions

•Patternbaseddefinitionofdecksandparametricdefinition of bulkheads (planar, corrugated and extruded)

•Topologicalrelationsbetweensurfaces

Hulls and Decks Structure

At basic design stage, shell and deck plates can be modelled as areas of common grade and scantling, limited by any 3D curve on the surface (butts, seams, knuckles, etc.). These areas can be divided and detailed if the design progresses.

FORAN can insert sets of longitudinal stiffeners on each surface, from end to end, and chop them at the points of change of scantling. As in the case of plates, stiffeners can be later detailed and split at block or part limits.

Openings can be defined projecting any 2D geometry on the surface. FORAN provides clipping of all the plates and stiffeners affected by the opening. Small openings can be included, and filtered out when exporting the model to FEM.

Internal Structure

FORAN provides tools for defining planar, multi-planar or corrugated structures. In many cases, bulkheads, floors, web frames and beams, stringers, and other structural elements can be easily defined just with one click on a sequence of intersection lines, automatically provided on each working section. The smart or topological copy is of special interest at basic design.

FEM Export

FORAN structure model is created in true shape. Plate and profile elements are rendered as BREP solids including thickness, openings, end cuts and other details automatically introduced by the FORAN modelling tools.

For global FEM analysis, FORAN provides an idealization tool that

simplifies the structure model removing thickness and non-relevant details, and then applies the necessary stretch or shrink to the elements to ensure that contacts and connections are kept.

FORAN divides all plate and profile elements at any contact and intersection. The result is a collection of connected elementary surfaces, exported in IGES or STEP formats, which can be easily meshed in most pre-processors.

The scantling and grade of each element is exported too. Many FEM pre-processors in the market include functions for reading the FORAN FEM XML files. It is also possible to configure the colour codification according to the scantling of the parts.

In addition to the global ship analysis, where the simplification of the model is mandatory, the detailed model can be directly used for local and fatigue analysis. Export to STEP, IGES, JT and

other standard formats are available.

2. Basic Design

Class Drawings

The FORAN drafting environment provides tools to create structure class drawings from the 3D model, in traditional structure 2D style, and to update drawings after changes in the model. It is DXF compatible. Some remarkable features are the smart labelling, that symbols can be automatically inserted at drawing generation and changes in the 3D model can be propagated to each drawing upon user request.

Outfitting Basic Design

P&I diagrams

FORAN provides a smart 2D generator for piping, instrumentation and electrical schematics. Equipment, pipes and other elements on the diagram are transparently assigned with technological data and attributes from the machinery and outfitting libraries on the database.

Key features:

•Full2Deditor,DXFcompatible

•Bidirectionalintegrationwiththe3Dmodel

•Connectionconsistencybetweenequipmentorfittings symbols and distributors

•Automaticassignmentandon-lineeditionofproperties to elements

•Automaticpartlistsgeneration

•Managementofmulti-sheetdiagrams

Machinery and Outfitting Layouts

Outfitting and machinery layouts can be defined in the FORAN general arrangement tool, allowing the ship configuration at the early stages of the project. This application follows the FORAN model-to-drawing approach, but provides also a 2D drafting environment, DXF compatible, that includes functions for placing and modifying equipment on the ship views. The 3D model is automatically updated when the 2D is modified.

Weight and materials estimate

FORAN provides accurate weight calculation of all parts included in the 3D model. The parts are considered with true shapes, including thickness, actual scantlings, openings, lengths and diameters, with the maturity level present in the model. The 3D model can produce material estimates in terms of tons of steel, areas of plate for each thickness and grade, total length for each profile section, material and scantling, number and type of fittings, pipes and equipment.

The right shipbuilding CAD/CAM System

D A T A B A S E

www.foransystem.com

www.sener-group.com

The right shipbuilding CAD/CAM System

FORAN Basic Design Benefits

•Efficienttoolfortheearlydefinitionofthestructuremodel in 3D

•Automaticgenerationofclassdrawings

•SmartexporttoFEMtoolsinstandardformats,withanidealization capability to avoid unnecessary data for the analysis

•IntelligentdefinitionofP&Iandsinglewirediagramsconnected to the 3D model

•Earlypositionofmachineryandequipmentlayout

•Automaticregenerationofclassdrawingsafterchangesin the model

•Smoothtransitiontodetaildesignandproductionstage

•Considerablereductionsofthemanhourswiththecombination of FORAN and pre-processor meshing.

•Weightsandmaterialsestimate

Hull Forms file Early definition of the 3D model of structure

•Normsdefinition•Materialcatalogue

•P&Idiagrams•Single-wirediagrams

Idealization of thestructure model

Report generation Automatic generationof drawings & regeneration

Early positionof the 3D main equipment

Standards definition

FSURF FHULL

FNORM

FEM LINKFREPD/FREPG FDESIGN

FGA/FPIPE

FSYSD

FDEFIN

3D Model suitablefor FEM analysis

Reports Class drawings and weights estimation

Reports

All reports in FORAN are generated in a single application with powerful capabilities and user-friendly interface. The outputs can be easily generated and update after changes.

2. Basic Design