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On the generation of smooth three-dimensional rigid body motions

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3 Author(s)
Zefran, M. ; Dept. of Comput. Sci., Pennsylvania Univ., Philadelphia, PA, USA ; Kumar, V. ; Croke, C.B.

This paper addresses the problem of generating smooth trajectories between an initial and a final position and orientation in space. The main idea is to define a functional depending on velocity or its derivatives that measures smoothness of trajectories and find a trajectory that minimizes this functional. In order to ensure that the computed trajectories are independent of the parametrization of positions and orientations, we use the notions of Riemannian metric and covariant derivative from differential geometry and formulate the problem as a variational problem on the Lie group of spatial rigid body displacements. We show that by choosing an appropriate measure of smoothness, the trajectories can be made to satisfy boundary conditions on the velocities or higher order derivatives. Dynamically smooth trajectories can be obtained by incorporating the inertia of the system into the definition of the Riemannian metric. We state the necessary conditions for the shortest distance, minimum acceleration and minimum jerk trajectories

Published in:

Robotics and Automation, IEEE Transactions on  (Volume:14 ,  Issue: 4 )

Date of Publication:

Aug 1998

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