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217 results on '"Davison, Edward J."'

92. Controller design of multivariable LTI unknown systems.

Author

Wang, William S. W. and Davison, Edward J.

Abstract

This paper deals with the design of multivariable controllers for stable linear time-invariant multi-input multi-output (MIMO) systems, with an unknown mathematical model, subject to constant reference/disturbance signals and actuator saturation constraints. A new controller parameter optimization approach, which can be carried out experimentally with no knowledge of the plant model nor of the order of the system, is proposed. The approach has the advantage that controllers can be tuned by perturbing only the initial conditions of the servocompensator, and that the order of the resulting controller obtained can be specified by the designer. Implementation of the proposed controller design approach is described, and an experimental application study of the proposed method applied to a multivariable system with industrial sensor/actuator components is presented to illustrate the feasibility of the design method in an industrial environment. [ABSTRACT FROM PUBLISHER]

Published
2012
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95. Decentralized control of descriptor systems. (Technical Notes and Correspondence)

Author

Chang, Timothy. N. and Davison, Edward. J.

Subjects
System design -- Analysis, Servomechanisms -- Analysis
Abstract

In this work, the decentralized stabilization and decentralized servomechanism problem for descriptor systems is considered. A descriptor system is one characterized by the existence of algebraic constraints on the plant state variables. Such constraints may translate into undesirable impulsive behavior, a property not found in conventional, proper, state space systems. Conditions are therefore investigated to determine if a system can be made "impulse-free" by suitable feedback action, and in this case the conditions are expressed in terms of the so-called decentralized impulsive fixed modes of the system. The notions of transmission zeros and decentralized fixed modes are defined for the class of descriptor systems and it is shown that they play a central role in determining the solvability of the decentralized robust servomechanism problem for descriptor systems. Two applications, tuning regulator design and sequential synthesis, are also addressed in this work. Index Terms--Decentralized control, descriptor system, fixed modes, impulsive modes, servomechanism problem.

Published
2001

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