Actuator Linearisation for Multivariable Control Applications

Ringwood, John and dePaor, Annraoi (2009) Actuator Linearisation for Multivariable Control Applications. Signals, Circuits and Systems (SCS), 2009 3rd International Conference. Print ISBN: 978-1-4244-4397-0. pp. 1-6.

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Fixed speed actuators have a characteristic nonlinear transient response. While this may not present a problem for single-input, single-output (SISO) control systems containing such actuators, the mixture of different fixed speed actuators is usually problematic in multivariable control applications. This paper presents two methods which allow such nonlinear actuators to present a linear response and therefore allow their incorporation in linear multivariable control design methods. The first method is based on a closed-loop describing function approximation, while the second uses an equivalent nonlinearity concept to linearise the relay which represents the fixed-speed limitation. A simulation study, demonstrating the performance of both schemes in a multivariable control setting, is presented.

Item Type: Article
Keywords: Actuator; linearisation; describing function; equivalent nonlinearity; multivariable control;
Academic Unit: Faculty of Science and Engineering > Electronic Engineering
Item ID: 2124
Depositing User: Professor John Ringwood
Date Deposited: 22 Sep 2010 15:43
Journal or Publication Title: Signals, Circuits and Systems (SCS), 2009 3rd International Conference. Print ISBN: 978-1-4244-4397-0
Publisher: IEEE
Refereed: Yes

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