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- Path: sparky!uunet!usc!ierardi@flash.usc.edu
- From: ierardi@flash.usc.edu (DJ Ierardi)
- Newsgroups: la.seminars
- Subject: USC Computer Science Colloquium (11/25/92)
- Date: 19 Nov 1992 17:28:30 -0800
- Organization: University of Southern California, Los Angeles, CA
- Lines: 44
- Distribution: la
- Message-ID: <1ehevuINN2f7@flash.usc.edu>
- NNTP-Posting-Host: flash.usc.edu
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- USC Computer Science Colloquium
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- Title: Geometric Assembly Planning
- Speaker: Randy Wilson,
- Stanford University
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- Abstract:
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- A good assembly plan is crucial for reliable, inexpensive assembly
- of products. Assembly sequencing, a subproblem of assembly planning,
- considers only the constraints on assembly plans arising from the geometry
- and physics of the product itself. In this talk I consider the problem of
- efficiently generating assembly sequences strictly from the geometry of a
- goal assembly.
- Previous approaches to assembly sequencing have either been
- incomplete or followed a generate-and-test approach that is impractical for
- assemblies with many parts. I introduce the non-directional blocking graph,
- a succinct characterization of the blocking relationships between parts in
- an assembly. I describe polynomial-time algorithms to identify feasible
- assembly operations by constructing and analyzing the NDBG for a product.
- Several instances of the NDBG are given, each corresponding to a different
- class of motions used to mate the parts.
- The algorithms have been implemented in GRASP, an experimental
- testbed for assembly sequencing, and tested on industrial assemblies having
- as many as 42 parts. Experimental results are shown for the basic planner
- and compared against the results when the more efficient methods are used.
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- Time: Wednesday, November 25 10:30 AM
- Location: Seaver Science Auditorium
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- (Refreshments will be served.)
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