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Single Stop Optimization of Manipulator Maneavers with Variable Structure Control

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2 Author(s)
Chen, N. ; Dept. of Aeronautical and Astronautical Engineering, University of Illinois, Urbana, IL 61801 ; Dwyer, T.A.W.

One step ahead optimization has been recently proposed for spacecraft attitude maneuvers as well as for robot manipulator maneuvers. Such a technique yields a discrete time control algorithm implementable as a sequence of state-dependent, quadratic programming problems for acceleration optimization. Its sensitivity to model accuracy, for the required inversion of the system dynamics, is shown in this paper to be alleviated by a fast variable structure control correction, acting between the sampling intervals of the slow one step ahead discrete time acceleration command generation algorithm. The slow and fast looping concept chosen follows that recently proposed for optimal aiming strategies with variable structure control. Accelerations required by the VSC correction are reserved during the slow one step ahead command generation so that the ability to overshot the sliding surface is guaranteed.

Published in:

American Control Conference, 1987

Date of Conference:

10-12 June 1987

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