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CP =
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Contributed Presentation (each speaker has 15 minutes
for presentation + 5 minutes for Q&A).
Invited Plenary Presentation (each speaker has 50
minutes for presentation + 10 minutes for Q&A).
Minisymposium (each speaker has 25 minutes for
presentation + 5 minutes for Q&A). |
Note: For papers with multiple authors, the
speaker is shown in italics if known at this time.
Thursday, October 22
7:30 AM-4:00 PM Registration
Room: Sussex South Foyer
7:50 AM-8:00 AM
Welcoming Remarks
David Field, General Motors Corporation
Room: Sussex South
IP1
Some Mathematical Aspects of Feature Applications
8:00 AM-9:00 AM
Chair: David Field, General Motors Corporation
Room: Sussex South
In CAD modeling and in engineering applications
downstream of design, features are defined in a higher level of data
than the detailed boundary representation of a geometric part model
in terms of faces, edges and vertices. They appear to provide the
appropriate level of granularity of information for direct use in
most phases of design and manufacturing. However, features present
many difficulties in the implementation and integration of systems to
provide a wide range of engineering functionality. These include the following:
1. Every different engineering application has its own
distinct feature view of the same product. Multiple views must
therefore be handled in any integrated engineering context.
2. Different organizations may also have diverse
feature views of the same product, even for the same application,
because of differences in design philosophy or in available
manufacturing resources.
3. Partly as a consequence of 1) and 2), it is
difficult even to give a precise definition of what a feature is!
Some necessary components of a definition for a form
feature will first be identified. The presentation will then take a
lightning tour of feature-based approaches to a variety of different
engineering applications, concentrating on the more mathematical
aspects of the subject. The topics that will be touched upon include
automatic feature recognition, features in computer vision and
reverse engineering, features on free-form artifacts, the
relationship of features to engineering tolerances, the automated
inspection of features on manufactured parts, and features in
assembly. The fundamental role of several branches of geometry in
feature-based applications will be emphasized.
Michael J. Pratt
Engineering Design Technologies Group,
Manufacturing Systems Integration Division,
National Institute of Standards and Technology,
Gaithersburg, Maryland
9:00 AM-9:15 AM Coffee
Room: Sussex North Foyer
MS1
Some Applications of Geometry in Form Features
9:15 AM-10:45 AM
Room: Sussex South
Organizer: Michael J. Pratt
National Institute of Standards and Technology
- 9:15-9:40 Feature Definition and Extraction
Using Curvature Region/Primitive Shape Abstractions Coupled with Constraints
- Ratnakar Sonthi, Fan Zhao, and Rajit
Gadh, University of Wisconsin, Madison
- 9:45-10:10 Methodologies for the Evaluation of
Systematic Form Deviations for Inside-Diameter Cylindrical Features
and Their Relationship to Process Variables
- R. P. Henke, R. M.
Cassou, and K. D. Summerhays, University of San Francisco; J. M.
Baldwin, Sandia National Laboratories; and C. W. Brown, Allied Signal
Federal Manufacturing and Technologies
- 10:15-10:40 Title to be announced
- Presenter to be announced
10:45 AM-11:00 AM Coffee
Room: Sussex North Foyer
11:00 AM-12:00 PM Concurrent Sessions
- CP1
Recognition and Extraction of Features I
11:00 AM-12:00 PM
Chair: Michael
Lachance, University of Michigan, Dearborn
Room: Sussex South
11:00-11:15 Maximal Feature Recognition by
Recursive Volume Decomposition
Yoonhwan Woo and
Hiroshi Sakurai, Colorado State University
11:20-11:35 Feature Extraction from Filleted
Geometric Models via a Virtual Edge Approach
Fan Zhao, Ratnakar Sonthi, and Rajit
Gadh, University of Wisconsin, Madison
11:40-11:55 Machining Feature Extraction by Graph Decomposition
Masatake Higashi, Toyota Technological Institute,
Japan; and Hirohisa Kojima,
Toyota Motor Corporation, Japan
- CP2
Recognition and Extraction of Features II
11:00 AM-12:00 PM
Chair: Jack Nachman,
Oakland University
Room: Sussex North
11:00-11:15 Representations and Algorithms for
CAD/CAM Digital Libraries
William C. Regli and
Vincent A. Cicirello, Drexel University
11:20-11:35 Towards an Ontology-Based Definition of
Design Features
Wilfred
van der Vegte, Imre Horváth, Jeroen P. W. Pulles, Aad P.
Bremer, and Joris S.M. Vergeest, Delft University of Technology, The Netherlands
11:40-11:55 Multiple-View Product Modelling with
Enhanced Features
Alex Noort and Willem
F. Bronsvoort, Delft University of Technology, The Netherlands
12:00 PM-1:00 PM Lunch
Room: West End
MS2
Beginning a Dialogue with Industry
1:00 PM-3:30 PM
Room: Sussex South
Various organizations in industry have proceeded to
use their own concepts of features for their enterprises. This
minisymposium aims to report on what has been done, on the directions
being taken and on the problems encountered along the way. This
dialogue hopes to bring attention the disparate efforts and
illuminate opportunities for fundamental mathematical approaches upon
which to build bridges that link the variety of efforts. Whether
these efforts lie at the Frontiers of research, at the Interfaces
between new ideas and their applications or in the Trenches where the
turmoil of applications take place, a mathematically based dialogue
is essential.
Organizer: David A. Field
General Motors Corporation
- 1:00-1:25 Process-Driven Deformable Features
for Automotive Sheet Metal Die Operations
- Tom Assiff, David Bindshadler, and Emmanuel
Tsimmis, Unigraphics
- 1:30-1:55 Features in Reverse Engineering
- Paul Besl, Silicon Graphics Inc.
- 2:00-2:25 Representing Manufacturing Features
to Support Design and Process Changes
- Steve Brooks, Allied Signal
- 2:30-2:55 The Use of Features in Design and Optimization
- Dan Filip, Parametric Technology Corp.
- 3:00-3:25 The Use of Key Characteristics for
Knowledge-Based Design and Engineering
- Mohsen Rezayat, Structural Dynamics Research Corp.
3:30 PM-4:00 PM Coffee
Room: Sussex North Foyer
MS3
The Role and Character of Features in Geometric Tolerancing
4:00 PM-6:30 PM
Room: Sussex South
Designers use dimensional tolerances to specify limits
for variations in the size, shape, and configuration of mechanical
parts and assemblies. 'Geometric' tolerancing, which is the
predominant contemporary scheme, evolved from a century of industrial
practice, and is codified in national and international standards in
which concepts and relations are defined informally, through examples
cast in prose and graphics. However, computerization of design and
manufacturing is driving a new surge of activity aimed at
'mathematicizing' tolerancing, and one of the major thrusts is aimed
at defining sharply the notion of 'feature' ... and doing so in a
manner that supports and simplifies the roles that features play in
mechanical design, tolerancing, and conformance metrology. This
minisymposium will review current thinking on these matters, with
special attention given to recent results in symmetry-group
classification of surfaces.
Organizers: Vijay Srinivasan
IBM Thomas J. Watson Research Center and Columbia University
Herbert B. Voelcker
Cornell University
- 4:00-4:25 Features in Mechanical Tolerancing -
a Potpourri of Issues
- Herbert B. Voelcker, Organizer
- 4:30-4:55 Introduction to TTRS and Its Applications
- Andre Clement, Dassault Systemes, Suresnes, France
- 5:00-5:25 Datums Based on Symmetry Groups
- Vijay
Srinivasan, Organizer and Alan K. Jones, The Boeing Company, Seattle
- 5:30-5:55 A Declarative Approach to Metrology
Using Features
- Alain Riviere, Institut Superieur des Materiaux et
de la Construction Mecanique, France
- 6:00-6:25 Adding Metric Concepts to Features
- Philippe Serre, Institut Superieur des Materiaux
et de la Construction Mecanique, France
Friday, October 23
7:30 AM-12:00 PM Registration
Room: Sussex South Foyer
7:55 AM-8:00 AM Closing Remarks
David Field, General Motors Corporation
Room: Sussex South
IP2
CAD and the Product Master Model
8:00 AM-9:00 AM
Chair: David Field, General Motors Corporation
Room: Sussex South
Computer-Aided Design has moved from shape design to
providing a focal point for integrating product design activities
including CAE, costing, and manufacturing. The development of the
broader focus on product information creation, processing, and
maintenance brings with it many issues that need to be addressed,
with a view to technical solutions, business considerations, and
legacy concerns. The speaker will discuss a framework for a master
model architecture that addresses those considerations. In
particular, he will explore whether major subsystems in product
design can be federated to work together in a minimally invasive setting.
Christoph M. Hoffmann
Department of Computer Science
Purdue University, West Lafayette
9:00 AM-9:15 AM Coffee
Room: Sussex North Foyer
MS4
Feature-Evolutionary Currents in CAD
9:15 AM-10:45 AM
Room: Sussex South
CAD evolution is affected by in-the-large
architectural design trends and by component technology currents. The
minisymposium focuses on several component technology developments.
They include:
- topological constraints on features; creating new
formal techniques for expressing constraints that are outside the
domain of geometric constraints, yet have critical design significance.
- feature recognition; surveying current technology on
how to recognize automatically form features and how to interpret them.
- integrated CAD/CAE design optimization.
These subjects will be presented by specialists in
these areas, and give a preview of technology trends that are likely
to assume greater significance in coming years.
Organizer: Christoph M. Hoffmann
Purdue University, West Lafayette
- 9:15-9:40 Set Operations Under Topological Constraints
- William W. Charlesworth,
Engineous Software, Inc., Morrisville, NC; and David C. Anderson,
Purdue University, West Lafayette
- 9:45-10:10 Feature Identification from CAD
Models: A Status Report
- William C. Regli, Drexel University
- 10:15-10:40 Constrained
Shape Optimization: Can Geometric Modeling and Engineering Analysis
Systems Cooperate?
- Jovan Zagajac, Ford Motor Company
10:45 AM-11:00 AM Coffee
Room: Sussex North Foyer
11:00 AM-12:00 PM Concurrent Sessions
- CP3
Recognition and Extraction of Features III
11:00 AM-12:00 PM
Chair: James
Cavendish, General Motors Corp.
Room: Sussex South
11:00-11:15 Recognition of Roughing Features in
Turned and Milled Components
Sri Hinduja, X. Xu, and
A. R. O. Guerra, UMIST, United Kingdom
11:20-11:35 The Application of Wavelet Transforms
to the Extraction of Form Features in CAD Models
Abir Z. Qamhiyah and
Lei Sun, Iowa State University
11:40-11:55 A New Methodology for Manufacturing
Feature Recognition Based on Multi-Agents System and a Stochastic
Neural Network
Abdelkader Belhi and
Pierre-Jean Erard, Neuchatel University, Switzerland
12:00-12:15 Modeling Complex Form Features with
NURBS Sweeps
Q. Jeffrey Ge, State University of New York, Stony Brook
- CP4
Recognition and Extraction of Features IV
11:00 AM-12:00 PM
Chair: David Field,
General Motors Corp.
Room: Sussex North
11:00-11:15 Features in Layer Manufacturing of
Heterogeneous Objects
Debasish Dutta and X.
Qian, University of Michigan, Ann Arbor
11:20-11:35 Multiple Feature Modeling for Plastic
Moldbase Design
Yasushi Yamaguchi,
University of Tokyo, Japan; and Tamotsu Hasegawa, Nippaku Co. Ltd., Japan
11:40-11:55 Defining Features to Modify Models
Incorporating Free Form Surfaces
Frédéric
Noel, Stéphane Guillet and
Jean-Claude Léon, Domaine Universitaire, France
12:00-12:15 Management of Free-Form Surface Meshes
Based on Mechanical Features
Frédéric Noel
and Jean-Claude Léon, Domaine Universitaire, France
12:20 PM-1:30 PM Lunch
Room: West End
MS5
Feature-Based Product Design: Theoretical Principles and System Concepts
1:30 PM-3:00 PM
Room: Sussex South
The current state of feature technology shows that the
absence of theoretical principles is a weak point of research and
development. As a consequence, no common theoretical foundation and
understanding of features and their systematization exists, nor
uniform design methods and tools powerful enough to drive the focus
from a quantitative to a qualitative problem solving.
The main goal of this minisymposium is to point out
the importance of theoretical foundation and system concepts for the
development of a new generation of feature-based CAD systems. The
following topics are within the scope of the minisymposium:
1. Uniform feature definition, leading to a common
understanding and agreement of the term 'feature'.
2. Evolution of feature-based product models, which
should not only cover conceptual and detailed design models, but also
maintain the semantic consistency of two product states.
3. Incomplete feature-based product models to
facilitate the representation, transformation and exchange of
incomplete product information.
4. Reference architecture of a feature-based CAD
system, which allows the CAD configuration at runtime depending upon
the given design tasks or application areas.
Organizer: Jivka Ovtcharova
TECMATH GmbH & Co. KG, Germany
- 1:30-1:55
Towards
Theoretical Principles of Features
- Jivka Ovtcharova, Organizer
- 2:00-2:25 Evolution of Feature-Based Product Models
- Dieter Roller and Fei Gao,
University of Stuttgart, Germany
- 2:30-2:55 Incomplete Product Models:
Feature-Based Approach
- Dieter Roller and Fei
Gao, University of Stuttgart, Germany
3:00 PM-3:30 PM Coffee
Room: Sussex North Foyer
MS6
The Interaction of Geometry and Topology for Features
3:30 PM-5:00 PM
Room: Sussex South
The CAGD problem addressed in this minisymposium is
the importance of coordination of geometric accuracy with topological
intent to enforce the semantics of a design model. Features serve to
encapsulate some key ideas, but as the underlying geometry becomes
increasingly complex the basic principles behind the coordination
with topology becomes more difficult. An emerging research theme to
address these problems is to question the underlying conceptual model
of regular closed sets and the extent to which model boundaries can
be perturbed. The scope of this minisymposium will range from a
presentation of the fundamental geometric accuracy issues that are
present in all geometric modeling schemes through to topological
issues and design semantics.
Organizer: Thomas J. Peters
University of Connecticut, Storrs
- 3:30-3:55 Geometric Uncertainty
- David R. Ferguson, Boeing Information and Support
Systems, The Boeing Company
- 4:00-4:25 Features and Anti-Features
- Thomas J. Peters, Organizer
- 4:30-4:55 Continuous Deformations in Parametric Modeling
- Srinivas Raghothama
and Vadim Shapiro, University of Wisconsin, Madison
5:00 PM Workshop adjourns
MMD Created: 8/14/98 Updated: 10/11/98