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- From: tw@aifh.ed.ac.uk
- Newsgroups: comp.ai,ai.seminars,ai.msgs,scot.announce
- Subject: Seminar on model-based reasoning/simulation. Edinburgh, 25 Aug
- Message-ID: <1992Aug19.161935.25937@aifh.ed.ac.uk>
- Date: 19 Aug 92 16:19:35 GMT
- Sender: tw@aifh.ed.ac.uk (Toby Walsh)
- Reply-To: tw@aifh.ed.ac.uk ()
- Organization: Dept AI, Edinburgh University, Scotland
- Lines: 34
-
-
- AI Department Seminar at 3pm, Tu 25th August in F10, 80 South Bridge, Edinburgh
- [please note the unusual time and day]
-
- Model-based Mechanism Analysis and Simulation for Intelligent CAD
-
- Leo Joskowicz
- IBM T.J. Watson Research Center
- P.O. Box 704
- Yorktown Heights, NY 10598
- (joint work with Elisha Sacks, Princeton U.)
-
- We present research in automating reasoning about mechanical devices, such
- as feeders, door locks, and brakes. Over the past five years, we have
- developed a framework that integrates geometrical and spatial reasoning
- with model-based techniques. We use configuration spaces as the
- first-principles paradigm to relate explicitly the structure and the
- behavior of a mechanism. We have shown the utility of this framework by
- automating aspects of common engineering tasks, such as analysis,
- simulation, mechanism comparison and classification, and design.
-
- This talk will focus on the analysis and simulation program. The program
- performs a kinematic simulation of driving motions and part contacts along
- with a limited dynamical simulation of gravity, springs, and friction. It
- produces a realistic, three-dimensional animation and a concise, symbolic
- interpretation of the simulation. It derives the kinematic motion
- equations for a large class of mechanisms, including ones with complex part
- shapes, varying part contacts, and multiple driving motions. It avoids
- collision detection during simulation by precomputing pairwise part
- interactions. It uses a simple model of dynamics that captures the
- steady-state effect of forces without the conceptual and computational cost
- of full dynamical simulation. We demonstrate that the simulation algorithm
- captures the workings of most mechanisms by surveying 2500 mechanisms from
- an engineering encyclopedia.
-