Controlo por Computador

The objective of this unit is learning the concept of discrete time dynamic system, including the control design.

There are several derives concepts, namely:

• what is a discrete system, how is characterized and what mathematical representations admits;
• differences between continuous and discrete signals;
• stability and performance;
• discrete time domain and complex frequency domain;
• feedback and closed loop stability;
• application limits of digital control;
• state-space representation;

the student should also know how to:

• convert a continuos system in its discrete equivalent;
• identify the poles and zeros of the transfer function and estimate the performance/stability from its pole-zero diagram;
• plot and analyse Bode and Nyquist diagrams;
• conclude about the stability of a closed loop system from its open loop Bode and Nyquist diagrams;
• compute the eigenvalues of the state-space representation and conclude about the stability;
• design a state variables feedback controller;

additionally, the student acquires the following non-technical competences:

• make a report on experimental work;
• manage time and meet deadlines;
• collaborative team work; abstract and formal reasoning;
• abstract modelling of problems; sub-optimal solutions;