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TECHNICAL BRIEFS

Time-Energy Optimal Control of Articulated Systems With Geometric Path Constraints

[+] Author and Article Information
Zvi Shiller

Department of Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, CA 90095

J. Dyn. Sys., Meas., Control 118(1), 139-143 (Mar 01, 1996) (5 pages) doi:10.1115/1.2801134 History: Received June 01, 1993; Revised August 01, 1994; Online December 03, 2007

Abstract

The motions of articulated systems along specified paths are optimized to minimize a time-energy cost function. The optimization problem is formulated is a reduced two-dimensional state space and solved using the Pontryagin maximum principle. The optimal control is shown to be smooth, as opposed to the typically discontinuous time optimal control. The numerical solution is obtained with a gradient search that iterates over the initial value of one co-state. Optimal trajectories are demonstrated numerically for a two-link planar manipulator and experimentally for the UCLA Direct Drive Arm. The smoother time-energy optimal trajectory is shown to result in smaller tracking errors than the time optimal trajectory.

Copyright © 1996 by The American Society of Mechanical Engineers
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