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2015 | Book

Linear Parameter-Varying and Time-Delay Systems

Analysis, Observation, Filtering & Control

Author: Corentin Briat

Publisher: Springer Berlin Heidelberg

Book Series : Advances in Delays and Dynamics

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About this book

This book provides an introduction to the analysis and control of Linear Parameter-Varying Systems and Time-Delay Systems and their interactions. The purpose is to give the readers some fundamental theoretical background on these topics and to give more insights on the possible applications of these theories. This self-contained monograph is written in an accessible way for readers ranging from undergraduate/PhD students to engineers and researchers willing to know more about the fields of time-delay systems, parameter-varying systems, robust analysis, robust control, gain-scheduling techniques in the LPV fashion and LMI based approaches. The only prerequisites are basic knowledge in linear algebra, ordinary differential equations and (linear) dynamical systems. Most of the results are proved unless the proof is too complex or not necessary for a good understanding of the results. In the latter cases, suitable references are systematically provided. The first part pertains on the representation, analysis and control of LPV systems along with a reminder on robust analysis and control techniques. The second part is concerned with the representation and analysis of time-delay systems using various time-domain techniques. The third and last part is devoted to the representation, analysis, observation, filtering and control of LPV time-delay systems. The book also presents many important basic and advanced results on the manipulation of LMIs.

Table of Contents

Frontmatter

Linear Parameter-Varying Systems

Frontmatter
Chapter 1. Introduction to LPV Systems
Abstract
The goal of this chapter is to introduce the main ways for representing linear parameter-varying systems and emphasize their ability to represent a wide class of dynamical systems. A classification of the types of parameters regarding their mathematical properties and their physical meaning is also given. Several real world examples of LPV systems are finally discussed in order to demonstrate the relevance of the LPV framework.
Corentin Briat
Chapter 2. Stability of LPV Systems
Abstract
This chapter first presents the main stability and instability results for general dynamical systems. These results are then further adapted to the analysis of linear parameter-varying systems in the generic, polytopic and LFT frameworks. Notably, the notions of quadratic and robust stability using quadratic Lyapunov functions are introduced. Some other types of Lyapunov functions are also briefly discussed. The developed results rely on robust analysis techniques such as robust Lyapunov inequalities, the small-gain theorem, integral quadratic constraints and topological separation, and are expressed through linear matrix inequalities. A particular emphasis is made on the connections between the different approaches used to analyze LPV systems in LFT-form.
Corentin Briat
Chapter 3. Control of LPV Systems
Abstract
This chapter is devoted to the development of control-laws for linear parameter-varying systems. The LPV framework allows for an easy design of gain-scheduled controllers, that is, controllers whose state-space structure depends on the value of the parameters thereby used as scheduling variables. Ways for designing gain-scheduled state feedback and dynamic output feedback controllers are presented in the generic, polytopic and LFT settings. The goal of this chapter is not to detail the most advanced results obtained to date but rather to give a clear picture of what can be done. Suitable references pointing towards more recent and efficient results are given for completeness.
Corentin Briat

Time-Delay Systems

Frontmatter
Chapter 4. Introduction to Time-Delay Systems
Abstract
The goal of this chapter is to introduce the main manners for representing time-delay systems. As for parameters in LPV systems, delays can also be classified in different categories depending on the their nature and the way they act on the system. Several real world examples are given to motivate the usefulness and relevance of time-delay systems in science and engineering. We notably discuss about the harmful and beneficial effects of the delays on the stability properties of dynamical systems. Controllers and observers that are specific to time-delay systems are finally briefly presented.
Corentin Briat
Chapter 5. Stability Analysis of Time-Delay Systems
Abstract
This chapter presents the main stability and instability results for general time-delay systems. These results are further adapted to the analysis of linear time-delay system using the extensions of Lyapunov theory, namely the Lyapunov-Krasovskii and Lyapunov-Razumikhin theorems, and input-output analysis techniques such small-gain techniques, integral quadratic constraints and quadratic separation. Theoretical results regarding the conservatism of model-transformations and bounding techniques are also derived. The different approaches are compared with each other based on their corresponding stability criteria. Some discussions about complexity reduction are also provided. As for LPV systems, all the obtained stability criteria take the form of matrix inequalities.
Corentin Briat

Linear Parameter-Varying Time-Delay Systems

Frontmatter
Chapter 6. Introduction to LPV Time-Delay Systems
Abstract
This chapter introduces parameter-dependent functional differential equations as a convenient way for representing linear parameter-varying time-delay systems. Particularities of these systems arising from the coupling between delays and parameters are notably pointed out. Some examples are then given to show the practical importance of linear parameter-varying time-delay systems in the modeling and control of real-world problems. Several stability results involving parameter-dependent linear matrix inequalities are finally provided. These results constitute the groundwork for developing design criteria for filters, observers and controllers for linear parameter-varying time-delay systems.
Corentin Briat
Chapter 7. Observation and Filtering of LPV Time-Delay Systems
Abstract
This chapter pertains of the observation and filtering of linear parameter-varying time-delay systems in the framework of parameter-dependent delay-differential equations and Lyapunov-Krasovskii functionals. Full-order and reduced order observers are first considered both in the memoryless and with-memory cases. Filters are discussed next. The results of this chapter have both corollaries in the non-delayed LPV systems and parameter-independent time-delay systems settings, and can thus be applied on these types of systems. Several examples with simulations are given for illustration.
Corentin Briat
Chapter 8. Control of LPV Time-Delay Systems
Abstract
This chapter pertains of the control of linear parameter-varying time-delay systems in the framework of parameter-dependent differential equations and Lyapunov-Krasovskii functionals. State-feedback and output-feedback controllers are considered both in the memoryless and with-memory cases. Controllers with approximate memory, which implement a different delay than the one in the system, are also introduced and shown to generalize the concepts of memoryless controllers and controllers with exact memory. Some examples with simulations are given for illustration.
Corentin Briat
Backmatter
Metadata
Title
Linear Parameter-Varying and Time-Delay Systems
Author
Corentin Briat
Copyright Year
2015
Publisher
Springer Berlin Heidelberg
Electronic ISBN
978-3-662-44050-6
Print ISBN
978-3-662-44049-0
DOI
https://doi.org/10.1007/978-3-662-44050-6