Banca de DEFESA: FRANCISCO DAS CHAGAS DA SILVA JUNIOR

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : FRANCISCO DAS CHAGAS DA SILVA JUNIOR
DATA : 03/02/2017
HORA: 09:00
LOCAL: Auditório do PPGEEC
TÍTULO:

Variable Structure Adaptive Pole Placement Control

PALAVRAS-CHAVES:

Robust Control, Adaptive Control, Pole Placement, Variable Structure
Systems, Interval Plants, Kharitonov's Theorem, Nonminimum Phase Systems, Nonlinear
Programming

PÁGINAS: 115
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Eletrônica Industrial, Sistemas e Controles Eletrônicos
ESPECIALIDADE: Controle de Processos Eletrônicos, Retroalimentação
RESUMO:

This work deals with the problem of designing adaptive pole placement
controllers for uncertain, monovariable, linear and time-invariant (LTI) plants,
both minimum and nonminimum phase plants. In the first scheme presented, called
Variable Structure Adaptive Pole Placement Control (VS-APPC), the controller
parameters are calculated at each instant of time from the plant parameters
estimates, which are generated by switching laws based on the Variable Structure
Systems (VSS) theory, and a characteristic polynomial, chosen based on performance
requirements and which defines the desired closed-loop pole locations. The second
scheme, called Interval Variable Structure Adaptive Pole Placement Control
(IVS-APPC), is designed for interval plants, i.e., plants whose parameters are
unknown but constrained within known intervals, which are common in practical
situations where often LTI system models treated are actually approximations of
nonlinear systems, for example, which may result in significant parametric
uncertainties for the control systems. In the IVS-APPC design, the controller
parameters are calculated in the same way as the VS-APPC case, but must be contained
in intervals previously calculated by an optimization algorithm that seeks to solve
a Nonlinear Programming problem, so to ensure that the closed-loop poles remain in a
convex region defined by the roots of an interval characteristic polynomial whose
stability is guaranteed by Kharitonov's Theorem. The main motivation of this work is
the application of the proposed schemes to nonminimum phase plants, since the
control approach known as Variable Structure Model Reference Adaptive Control
(VS-MRAC), which has presented over the last years satisfactory performance and
robustness results, is restricted to minimum phase plants. Simulation results are
presented to illustrate the properties of the proposed schemes, such as fast
transient, smooth control signal without filtering and robustness to parametric
variations.

MEMBROS DA BANCA:
Presidente - 347565 - ALDAYR DANTAS DE ARAUJO
Externo ao Programa - 1375337 - JOSENALDE BARBOSA DE OLIVEIRA
Externo à Instituição - JOSÉ ÁLVARO DE PAIVA - IFRN
Externo ao Programa - 3566630 - LEONARDO RODRIGUES DE LIMA TEIXEIRA
Externo à Instituição - ODAILSON CAVALCANTE DE OLIVEIRA - IFRN