Engineering Dynamics Ltd.

Terry D Day

Allen R York

A method for conducting a computerized simulation of a collision between at least two objects. The method includes creating a representation of each of the objects. Each representation is typically is a mesh of nodes and surface elements. The method also typically includes colliding the representations of the objects such that the representations contact each other, and at least a first representation experiences a respective deformation at each of a plurality of contact points. In addition the method typically includes, for at least a subset of the plurality of contact points, computing a respective local collision force associated with the deformation at such contact points, and calculating a resultant generalized collision force acting at a predetermined point associated with the first representation based on the local collision forces. Typically, the respective local collision force is related to a distance the region of the representation is deformed by a deformation relationship. The method may also include, for at least a subset of the plurality of contact points, calculating a deformation parameter that the first object experienced at the contact point, and restituting a region of the first object adjacent such contact point a restitution distance associated with the deformation parameter. Typically the deformation parameter is cumulative local deformation force, and the deformation parameter is related to the restitution distance by a restitution relationship.

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Portland, OR, United States of America

Terry D Day