Webenable Collaborative Computer Aided Design

1
European Commission
Asia-Information Technology and Communications

• Web-enable Collaborative Computer Aided Design
• Chongqing University Team

2
European Commission Asia-Information Technology
and Communications
1 Introduction

• About Collaborative Computer Aided Design
• distributed multiple-user systems
• concurrent and synchronized
• support engineering teams interactive
• A brief literature review of the latest
  development
• GridCAD
• FACADE
• CollIDE
• ARCADE system
• CSM
• Net FEATURE
• Scope of this research

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2 the system structure Web-enable collaborative
CAD
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3 . 3D feature modelling for collaborative design

• Comparing to the traditional ones, the new
  feature-modelling system for Internet-driven
  collaborative design have some characteristics
• Sharing of objects
• Accessible and coherence of data
• Real-time interactivity of object.

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3.1 The multi-granularity description approach
for 3D model
The new define of form feature for 3D model
Geometric knowledge of 3D model (S)
Feature information relative manufacturing
process (M)
Form feature of 3D model
Feature information relative life-cycle of
product (P)
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Geometric knowledge of 3D model (S)
the roughness-granularity description
Feature information relative manufacturing
process (M)
Feature information relative life-cycle of
product (P)
Geometric knowledge of 3D model (S)
the minuteness-granularity description


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The multi-granularity description approach for 3D
model
Feature information relative manufacturing
process (M)
Geometric knowledge of 3D model (S)
Feature information relative life-cycle of
product (P)

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3.2 parameterised form feature and parameterised
reference list of 3D model
Entity reference list of 3D model
Face reference list of 3D model
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Feature modeling Towards the local operation
based on tour-query of the historic records
recorded feature model information
parameterized form feature
established parameter list of the form feature
check the place of the local operation in the
historic records
query all the other features, which were
correlative with the feature changed
change them in the parameter list
sent them to system by data exchange mechanism,
reconstruct model
complete the local modification of model, realize
the design and finally edit the feature model
across the platforms.
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4. The platform of 3D feature models transmission
and communication
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provides functionality to start, join, leave and
close a collaborative session
coordinate the session
control all feature model data stream
transmission
Multicast stream controller
collects all operations requested
schedules operation for execution at the Server
a Java applet
Stream interface
grouped by some flows of feature model data
Feature parameter stream
MIIOP protocol
Multicast Internet Inter-ORB Protocol
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• 5. Dynamic Data Exchange for Collaborative CAD

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Define

• Dynamic data transaction concludes Insert,Delete
  and Update.
• The data types exchanged are the 3D geometric
  graphics, images, documents and design
  parameters, which are created in CAD systems,
  such as CATIA, I-DEAS, AutoCAD, Pro/Engineer.
• Exchange objects are the data operated by
  exchange transaction, not all the data.
• The operation systems may be the different
  platforms, such as Windows, Unix.
• The dynamic data exchange mechanism and
  organization mode for collaborative design based
  on Internet developed by author can succeed in
  data real-time exchange and share among the
  members.

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• Multi-databases
• Kernel database Oracle
• Child-Database CAD system
  databases
• Data exchange interface
• The application interface
• Exchange transmission interface
• Dynamic information space organization
• Coalition
• Service links
• Share CAD files in real time with distance users

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6 Case studies
Case studies1 Collaborative design of a
mechanical component
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Case study 2 Online collaborative worm gear
design and analysis
3D assembly model of globoid worm matting with a
helical invoute gear
FEA results of contact stresses on the gear tooth
surface worm matting with a helical invoute gear
of involute cylindrical worm helical gear drive
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7. Future work of Collaborative CAD for
Collaborative Design

• Cross-platform and cross-operation system
  technologies
• Model data transaction technologies
• Multi-server system

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• Thanks