DFKI Research Report-09-01

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RR-09-01



Language: English

by Udo Frese, Holger Täubig

Verfahren zur Vermeidung von Kollisionen gesteuert beweglicher Teile einer Anlage

25 Pages

Abstract

This technical report describes the collsion avoidance method \emph{Verfahren zur Vermeidung von Kollisionen gesteuert
beweglicher Teile einer Anlage} as applied for a patent by the German Research Center for Artificial Intelligence under
No. \texttt{102009006256.4-32}.

The method allows to centrally monitor moveable parts of a machine (e.g. robot arms or vehicles) and so avoids collisions
among the machine parts or with the environment. For this it can be used with or without additional sensorial perception
of the environment.

A basic idea of the described method is representing the volume touched by one part of a machine while its movement
as the convex hull of a finite set of points expanded by a buffer radius. This representation is robust, real-time
computable, and does not have numerical difficulties.
The representation is computed for all involved parts of the machine. Afterwards all relevant pairs of volumes, or the
sensed environment respectively, are checked for collisions. To do this, a new real-time algorithm is presented.

All computations performed by the method are conservative approximations, which results in the system as a whole being safe
in a strict mathematical sense.
The technical report offers a couple of versions for these conservative approximations. With this set of approximations
the user is enabled to trade a more exact model of his machine against a more easier and faster one.
Concerning vehicle trajectories (e.g. braking trajectories) the usage of a new configuration space is described also.
Its main advantage is a joint modeling of straight and circular trajectories and even turning on the spot without
singularities, which for instance occur with radius or curvature as parameter.

This document is available as PDF-File.

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DFKI-Bibliothek (bib@dfki.uni-kl.de)

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