Webenable Collaborative Computer Aided Design

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European Commission
Asia-Information Technology and Communications

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

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1 Introduction

• About Collaborative Computer Aided Design
• A brief literature review of the latest
  development
• Scope of this research

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2 the system structure Internet-based
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 of 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)
geometric knowledge of 3D model (S)
feature information relative life-cycle of
product (P)
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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Towards the local operation based on tour-query
of the historic records of feature modeling
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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• 5. Dynamic Data Exchange for Collaborative CAD

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• Multi-databases
• Data exchange interface
• Dynamic information space organization
• 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