# System Identification

LINMA2875  2018-2019  Louvain-la-Neuve

System Identification
5.0 credits
30.0 h + 30.0 h
2q

Teacher(s)
Hendrickx Julien ; Wertz Vincent (compensates Hendrickx Julien) ;
Language
Anglais
Prerequisites

This courses assumes familiarity with transfer functions, as taught in

LINMA1510 (Linear Control) or LFSAB1106 (Applied mathematics : Signals

and systems)

Main themes

This class is an introduction to system identification, which consists in finding an appropriate representation of a dynamical system using appropriate measurements. It will cover some of the main parametric and nonparametric methods for identifying dynamical systems, including in closed loop. It will also cover the properties of signals and model classes that are relevant for system identification. A realistic identification project will give students the opportunity to apply and implement the techniques that they will have learned.

Aims

With respect to the L.O. framework, this class contributes to the developpement of the following learning outcomes

• AA1.1, AA1.2, AA1.3
• AA2.1, AA2.4
• AA3.2
• AA5.3, AA5.5

More precisely, by the end of the class, the student will be able to :

• recognize a problem of system identificaiton
• propose and implement solutions to simple identification problems
• identify a dynamical systems using input-output data
• validate a model of system that has been identified, and compare different simple models
• design an experiment to identify a simple system
• develop a deeper understanding of system identification by him/herself if necessary  in order to solve more complex problems

Transversal learning outcomes :

• Handling unforeseen technical issues that appear when treating a real-world problem
• Making reasonable hypothesis for a given problem, and evaluating them a posteriori
• Taking part to a technical class in English

The contribution of this Teaching Unit to the development and command of the skills and learning outcomes of the programme(s) can be accessed at the end of this sheet, in the section entitled “Programmes/courses offering this Teaching Unit”.

Content

The following topics will be covered

• Nonparametric methods: temporal analysis, frequential analysis, including Fourier and spectral analysis
• Main classes of LTI systems and their properties, including the notions of identifiability and predictors
• Certain parametric methods: linear regression, instrumental variables, prediction errors, and some statistical methods including the maximum likelihood method
• The properties of (input) signal, including the notion of information content of the signals and the level of persistence of excitation.
• The convergence of the method seen
• Identification techniques for systems controlled in closed loop
Teaching methods
• Regular lectures.
• Resolutions of simple problems under the supervison of teaching assistant in order to get familiar with new concepts.
• Problem sets to be solved in small group in order to develop a deeper understanding of the concepts.
• A complete project of system identification in realistic conditions.
Evaluation methods
• Exam at the end of the year.
• Identification of a system on the basis of real input/output data (using the Matlab System Identification Toolbox, developed by L. Ljung).
• Problem sets during the year.
Other information

The lectures and problem sessions are in English, and all documents are in English.

Homework, exams, and project reports can be written in English or French.

The organisation details are specified on iCampus.

Bibliography

Lecture notes are available on icampus. In additon, two possible relevant reference books are :

1. « System Identification », Torsten Söderström and Petre Stoica  http://user.it.uu.se/~ts/sysidbook.pdf
2. « System Identification - Theory for the user », Lennart Ljung, Prentice Hall, 1999.
Faculty or entity

#### Programmes / formations proposant cette unité d'enseignement (UE)

Program title
Sigle
Credits
Prerequisites
Aims
Master [120] in Electrical Engineering
5
-

Master [120] in Electro-mechanical Engineering
5
-

Master [120] in Mechanical Engineering
5
-

Master [120] in Mathematical Engineering
5
-

Master [120] in Biomedical Engineering
5
-

Master [120] in Data Science Engineering
5
-

Master [120] in data Science: Information technology
5
-