Chapter4GeometricModelling.pdf

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CAD/CAM Principles and
Applications
Ch 4 Geometric Modelling
CAD/CAM Principles and
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Objectives
•
Understand the various requirements for the information that is
generated during the geometric modeling stage.
•
Study various types of geometric models possible and their
applications
•
Develop various methodologies used for geometric construction
such as sweep, surface models, solid models, etc.
•
Recognize the various types of surfaces and their application as
used in geometric modelling
•
Appreciate the concept of parametric modeling which is the
current mainstay of most of the 3D modeling systems
•
Develop the various mathematical representations of the curves
used in the geometric construction
•
Discuss the various CAD system requirements that need to be
considered while selecting a system for a given application
•
Understand the concept of rapid prototyping and the various
methods available for the purpose.
CAD/CAM Principles and
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4.1 Requirements of
Geometric Modelling
CAD/CAM Principles and
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Fig. 4.1
Total product cycle in a
manufacturing environment
Geometric
Modelling
Ideas
Design
Analysis
Production
CAD/CAM Principles and
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Functions of Geometric
Modelling
• Design analysis:
– Evaluation of areas and volumes.
– Evaluation of mass and inertia properties.
– Interference checking in assemblies.
– Analysis of tolerance build-up in assemblies.
– Analysis of kinematics — mechanics, robotics.
– Automatic mesh generation for finite element
analysis.
CAD/CAM Principles and
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