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Implementation of a SaaS based simulation platform using open standards and open source software.

12th NASA-ESA Workshop on Product Data ExchangeJotne, May,18th – May, 20th 2010, Oslo - Norway

Thomas Paviot (Supméca)*, Jelle Feringa (TU Delft)***tpaviot@gmail.com; **jelleferinga@gmail.com

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Agenda

The pythonOCC project: a python library for CAD/CAE development

CAD services A Service oriented architecture intended to

design and simulation exchanges Demo Questions

The diagnostic : poor end-user computing capabilities with CAD softwares

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CAD softwareEnd-user level(VB scripting,VB automation)

Modeling kernelDeveloperLevel (C++)

End-user computing?

What we did (2008->2009 - PDE2009)

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Developerlevel

pythonOCCA python library for CAD/CAE

Features: 2D/3D modeling Data Exchange

(STEP/IGES/STL) Basic GUI features

Features recently added (2009->2010)

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Meshing features (Quad, triangles, 2D and 3D)

Parametric modeling features

Current work Making pythonOCC being interoperable with other

components of the IT system: STEP file format is supported Strong, robust, well defined workflows to support the

exchange of STEP files Additional need for deeper integration and a more

dynamic solution Our current objective:

Use the webservices and SOA technologies to connect software components (high abstraction level, clear separation between the service and the implementation)

Rely on free and open source softwares : open source = open semantics Less licensing issues (data are exchanged but licenses are also

propagated through the system)

The process : add cadservices to pythonOCC, add public SOA layer to non-service oriented softwares

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CAD services

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What is a CAD service? A remote procedure call that holds CAD semantics

Granularity of CAD services? Low level Brep topology services: create_vertex,

create_edge, create_face etc. Mid-level design function services: make_extrusion,

make_revolution, make_pipe, boolean_fuse etc. High level templated CAD services: make_car(wheels=4,

automatic_gear_box=True etc.) Standardization of CAD Services?

OMG CAD Service, 2001 : not much granular – frozen project?

STEP AP203ed5 produral design and parametric representation could be mapped to webservices

Difficult to standardize any kind of service whereas needs can not be standardized in a general way.

Use case: the « cell table » (Vivid Gallery, Rotterdam)

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Use case: the « cell table » designed with pythonOCC

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The problem to solve : what is the rigidity of the table?

The SaaS design/simulation environment A set of business servers (SOAP servers) One controller to synchronize (clients)

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The implementation

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Demo (1/3): launching central component

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Demo (2/3): automated meshing with Salomé

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Demo (3/3): simulation with code-aster

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Conclusion

Benefits Dynamic programming Multi-platform Agile CAD/CAE development Use a wide range of other free and open source

libraries

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The use of open source software and open standards is suitable for the implementation of webservices dealing with CAD and simulation

Further information : http://www.pythonocc.org