Topology based tolerancing for geometric modeling operations

Details Topology based tolerancing for geometric modeling operations Topology based tolerancing for geometric modeling operations

1994-06-28

1997-08-05

Herndon, Heather R.

G00T 1500

Patent

active

056550634

ABSTRACT:
The invention relates to a method and apparatus for tracking and modifying the accumulated error and the current operational tolerance of each topological entity in a geometric model of a three dimensional object. Each topological entity has assigned to it a Mintol value and a Maxtol value, Mintol represents the current accumulated error associated with the entity. Maxtol represents the operational tolerance of the entity for future operations. The Mintol value for an entity is set and occasionally adjusted so that it comprises a volume which encompasses all other entities adjacent to the particular entity. With respect to Maxtol, when two entities are within a distance from each other which is less than the sum of the Maxtols of the two entities, the two entities can be combined. Maxtol is adjusted whenever Mintol is adjusted so as to remain larger than Mintol and whenever a new entity is created by the combination of old entities, so as to encompass the Maxtols of the two old entities.

REFERENCES:
Tsujio, Showzow et al "Computer-Aided Drawing Check for CAD System--A Method for the Checking of Dimensions in Multiview Mechanical Drawings," Systems Engineering, 1992 IEEE International Conference, pp. 234-237. (1992).
Valainis, John et al, "Two-Dimensional IC Layout Compaction Based on Topological Design Rule Checking," IEEE Transactions on Computer-Aided Design of Integrated Circuits, pp. 260-275, (1990).
Quinlan, Sean, et al, "Elastic Bands: Connecting Path Planning and Control," Robotics and Automation, 1993 IEEE International Conference, pp. 802-807, (1993).
Verwer, Ben J. H., "A Multisolution Work Space, Multiresolution Configuration Space Approach to Solve the Path Planning Problem," Robotics and Automation, 1990 IEEE International Conference, pp. 2107-2112, (1990).
Using Tolerances to Guanrantee Valid Polyhedral Modeling Results, Mark Segal, Computer Graphics, vol. 24, No. 4, Aug. 1990.

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