Title: Step-wise safe switching control of a constant turning force system

Authors: Fotis N. Koumboulis, Maria P. Tzamtzi, Christoforos E. Economakos

Addresses: Department of Automation, Halkis Institute of Technology, Psahna, Evia, 34400, Greece. ' Department of Automation, Halkis Institute of Technology, Psahna, Evia, 34400, Greece. ' Department of Automation, Halkis Institute of Technology, Psahna, Evia, 34400, Greece

Abstract: In this paper, we present the application of multivariable step-wise safe switching (MSWSS) in order to control a constant turning force system under varying cutting conditions. The non-linear part of the plant|s model is considered to be unknown and it is approximated by a set of linearised models which are derived through identification around corresponding operating points. State feedback proportional-integral controllers are designed to achieve sufficiently fast settling time and keep the cutting force at the appropriate level as the cutting depth varies with time. The controllers are designed using a metaheuristic search algorithm so as to achieve the required performance simultaneously for two adjacent operating points. A state observer is used to estimate the acceleration of the servomechanism that determines the feed rate of the cutting machine. Closed-loop performance is illustrated through simulation results.

Keywords: supervisory control; force control; manufacturing systems; switching control; multivariable step-wise safe switching; turning force; cutting force; PID control; state feedback control; metaheuristics; feed rate; simulation; controller design.

DOI: 10.1504/IJMIC.2011.039698

International Journal of Modelling, Identification and Control, 2011 Vol.12 No.3, pp.191 - 199

Published online: 21 Mar 2015 *

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