Defesa Pública da Dissertação de Mestrado do Engenheiro Eletricista Cristyan Lisbôa
Data: 30/08/2022 – terça-feira
Horário:14h00min
A defesa será realizada através de videoconferência pela plataforma Teams: https://teams.microsoft.com/l/meetup-join/19%3ankDdaJsxsUrD1mBEBOPW1EnBf__3ztw1vGgb-tIayRQ1%40thread.tacv2/1658487434668?context=%7b%22Tid%22%3a%22b34c1d55-a43e-4a20-9218-a1a42eab149a%22%2c%22Oid%22%3a%22e9f97fb8-144e-4490-8f28-285a0c1c85d3%22%7d
Link alternativo no caso de falha do primeiro: https://meet.google.com/ipm-fhvj-prc
Banca Examinadora:
Prof. Dr. Eugênio de Bona Castelan Neto – PPGEAS – UFSC
Prof. Dr. Rafael da Silveira Casatro – PPGEE – PUCRS
Prof. Dr. Aurélio Tergolina Salton – PPGEE – UFRGS
Presidente da banca/Orientador: Prof. Dr. Jeferson Vieira Flores – PPGEE – UFRGS
Coorienador: Prof. Dr. Luciano Gonçalves Moreira – IFSUL
Title: “EVENT-TRIGGERED SYNCHRONIZATION OF SATURATED LUR’E TYPE SYSTEMS”
Abstract:
“This dissertation addresses the problem of master-slave synchronization of nonlinear discrete-time Lur’e systems subject to input saturation via event-triggered control (ETC) techniques. Synchronization, which is considered a remarkable property in the physics literature specially when chaotic systems are under investigation, is achieved through the stabilization of the error between the states of the master and the slave system. Regarding the Lur’e type nonlinearity, two different cases are studied along this work: generic slope-restricted state-dependent nonlinearity and piecewise-affine function. In the ETC paradigm, the control signal is updated aperiodically only after the occurrence of an event, which is generated according to a triggering criterion that depends on the evaluation of a triggering function. In the emulation-based design, a synchronization error feedback controller is given a priori and the task is to compute the event generator parameters ensuring performance and closed-loop stability. On the other hand, in the co-design approach the event generator and the control law are simultaneously designed. Theoretical results are obtained for three types of event-triggered mechanism (ETM), namely: static, dynamic and relaxed. In the last case, practical synchronization conditions are derived as form of ultimately boundedness stability. In order to tune the parameters of the event-based strategy, optimization problems are formulated aiming to reduce the number of control signal updates (number of events) with respect to a time-triggered implementation. Numerical simulations are presented to illustrate the application of the proposed methods.
Keywords: Master-slave synchronization, Event-triggered control, Nonlinear Lur’e systems, Piecewise affine nonlinearities, Saturation.”
