SUC Brasil 2012 : Importing Models to Sesam GeniE

Ole Jan NekstadProduct Director - Sesam

3 December 2012

SesamTM

40 years of success

Importing FE/CAD data to Sesam GeniE

© Det Norske Veritas AS. All rights reserved.

Convert model to Sesam GeniE format

3 December 2012

Why change to Sesam – What’s in it for the customer

• Transaparency and sustainability

• Regulatory requirements

• Standards compliance

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ReduceCost

Return on Asset

ManagedRisk

Business Value

• Optimised performance

• Reduced downtime

• Extended lifetime

• Design and engineering efficiency

• Lower building cost

• Lower operational cost



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Which purposes can a model serve when imported into Sesam?



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Our tools – your solutions – your decisions

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In-place analysis (wave, pile-soil)Deflections, stresses, code-check, fatigue, earthquake

Transportation, liftingDeflections, stresses, code-check, fatigue

Transportation, launchingDeflections, stresses, code-check, fatigue

Non-linear analysis,collapse, accidents,re-qualifications, life extensions

Data import



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Re-use structural analysis model during life time

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Sesam Synergi Structure

SacsSTAAD.ProANSYSRhinoDXF

Sesam for

� Design

� Modification

� Life extension

Synergi Structure for

� Inspection planning, execution and follow up

� Condition monitoring

� Trending



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Import to Sesam GeniE - data formats supported

� Finite element data (CAE)- FEM format- Sacs format- StruCad3D- StaadPro- Ansys

� CAD data (lines)- DXF- Rhino- SAT- PDMS (sdnf)- PDS (sdnf)

� CAD data (surfaces)- SAT- Rhino (prototype)- S3D (prototype)

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Importing old Sesam format- Structure- Loads- Wave load conditions- Soil data



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Importing old Sesam format to GeniE

� Primarily for converting re-analysis models of jackets, in some cases import of surface models- Preframe, Prefem, Patran-Pre

� For frame and plate structures- Basically all structure, sections and materials. The

numbering system for beams may be maintained- Manually defined loads such as point, line, pressure,

acceleration loads- Wave load data such as hydrodynamic properties,

current, wave and load conditions- Soil data

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Importing Sacs format- Structure- Loads- Wave load conditions- Load combinations- Pile- Soil



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Importing a Sacs model into Sesam GeniE

� The procedure today- Import structure, sections, materials (automatic)- Import wishbone connections (automatic)- Import wave load data (automatic)- Import load combinations (automatic)- Import pile data (automatic)- Import soil data (automatic)- Add blanket and equipment loads

� Once the model has been imported and verified it can be used for all types of analyses in Sesam

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What are we developing wrt. Sacs import

� Import of tapered elements – Q3/2013- Will be converted to segmented members- Today – converted to smallest section

� Import of blanket loads – Q3/2013- Equipments and footprints in Sesam GeniE to be used- Today manual conversion of data – an easy task

� Import of equipments – Q3/2013- Equipments and footprints in Sesam GeniE to be used- Today manual conversion of data – an easy task

� Import of wind load data – Q3/2013- Beams and equipments

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Demo - 2

� Importing a module- 300 load combinations

� All data is imported and no manual work is needed

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Demo - 5

� A jacket where piles and soil are imported

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Importing StruCad format- Structure- Loads



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Importing StruCad data

� Capabilities structure, sections, materials and manually defined loads- Includes beams and plates

� Limitations- Load combinations- Hydrodynamic properties and wave loads- Pile and soil data

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Importing StaadPro format- Structure- Loads



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Importing StaadPro data

� Capabilities structure and manually defined loads and load combinations- Includes beams, plates, eccentricities,

boundary conditions

� Limitations- Sections not defined in StaadPro (reference

to database)- A separate utility tool creating a GeniE js-file

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A typical example

� A small topside- All converted and analysis can be run at once- 78 basic load cases, 73 load combinations

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Importing Ansys format- Structure- Loads



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Importing Ansys data

� The Ansys file is converted to a FEM file for import to GeniE- Structure, sections, materials and manually defined

loads

� Limitations- Linear dependencies and second order elements- Surface and line loads on shells. Temperature

loads

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Example

� Midship frame

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Import lines from CAD- DXF- Rhino- SAT- PDMS (sdnf)- PDS (sdnf)



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Import DXF

� Points, lines and poly-lines



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Import DXF – a typical barge

� Poly-lines used in skinning

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Import DXF – a typical FPSO

� Curves form the basis of surface generations – cover, skinning, curve-net interpolation

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Import from Rhino

� Requires that customer has Rhino and installs a plug-in Rhino4ToGeniE.rhp developed by us



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Import from Rhino

� The plug-in will produce a js-file for import to GeniE



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Import lines from Rhino

� Example of importing selected lines from Rhino

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� A real case example- The lines are exported from Rhino and surfaces are made by cover, flat-region, skinning and

curve-net interpolation- There are few surfaces leading to a model that is applicable for establishing both a panel

model and a structural analysis model

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Rhino model



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� Details of the hull

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Rhino model GeniE lines

GeniE mesh GeniE surface



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� Details of interior

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Rhino model

GeniE mesh

GeniE lines

GeniE surface



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Some remarks on DXF and Rhino

� Early versions of DXF; lines and circles only – these lines need to be approximated with splines before making the surfaces

� Newer versions of DXF and Rhino use splines and NURBS – surface generation can be done on these

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Example of many small lines approximated with splines



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The importance of having as few surfaces as possible

� Better user control of the mesh- Coarse element density, global strength analysis and panel modelling- Fine mesh density, detailed strength analysis

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Coarse mesh Fine mesh



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Export lines to Rhino

� On-going development

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Import surfaces from CAD- SAT- Rhino – prototype- S3D – prototype



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Surfaces from SAT

� A surface made in a CAD system supporting the SAT format- Several surfaces removed for visibility

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Label free edges



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Surfaces from Rhino – example 1

� A surface made in Rhino

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� Imported to Sesam GeniE

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� Another surface made in Rhino

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� Imported to Sesam GeniE

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Surfaces to Rhino – example 3

� Curves created in Rhino

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� Curves imported to Sesam GeniE

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� Surfaces made in Sesam GeniE

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� Surfaces exported from Sesam GeniE to Rhino- The hull is now mirrored as compared to the starting position in Rhino

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Model data from S3D

� Intergraph is making a prototype converter supporting the Sesam GeniE XML format- Better than pure geometry data transfer- Material, thickness, section properties part of the data conversion

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S3D



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To summarize



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Import to Sesam GeniE - data formats supported

� Finite element data (CAE)- FEM format- Sacs format- StruCad3D- StaadPro- Ansys

� CAD data (lines)- DXF- Rhino- SAT- PDMS (sdnf)- PDS (sdnf)

� CAD data (surfaces)- SAT- Rhino (prototype)

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Crossing the bridge to Sesam

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3 December 2012

Crossing the bridge gives access to a complete system

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3 December 2012

Crossing the bridge to Sesam GeniE

� There are operators that are migrating their data to Sesam- A leading operator world wide has 200+ models to be converted

� Pilot projects with other leading operators on data migration- In total these have more than 500 data models to be converted

� A streamline conversion process will lead to economic gains for the operators- Quality of data transfer, support, assistance, software

functionality, long term commitments from DNVS

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Safeguarding life, property and the environment

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SUC Brasil 2012 : Importing Models to Sesam GeniE

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