H∞ Control of Multirate Sampled-Data Systems: A State-Space Approach (2008)
Mats F. Sagfors, Hannu T. Toivonen, Bengt Lennartson
A state-space solutionof the H1 control problem for periodic multirate sampleddata systems is presented. The solution is characterized in terms of a pair of discrete algebraic Riccati equations with...
Hybrid Systems in Process Control (2007)
Bengt Lennartson, Michael Tittus, Bo Egardt, Stefan Pettersson
Modeling and control of hybrid systems, with particular emphasis on process control applications, are considered in this article. Based on a number of observations on typical mixed discrete and...
State-Space Solution to the Periodic Multirate (2007)
Control Problem, Mats F. Sagfors, Hannu T. Toivonen, Bengt Lennartson
A state-space solution to the H1 control problem for periodic multirate systems is presented. The solution is based on the lifting method, where an equivalent timeinvariant system description is...
Olof Lindgärde, Bengt Lennartson
Feedback control using both continuous-time and discretetime measurements is considered in this paper. A design method including both À-synthesis and frequency analysis is suggested. It includes a...
A Converse Theorem for Exponential Stability using Piecewise Quadratic Lyapunov Functions (2007)
Stefan Pettersson, Bengt Lennartson
We present sufficient and necessary conditions for exponential stability of autonomous nonlinear dynamical systems using piecewise quadratic Lyapunov functions. The necessary conditions are given as...
GLOBAL CONTROLLER OPTIMIZATION USING (2007)
Horowitz Bounds, Carl-magnus Fransson, Bengt Lennartson, Torsten Wik, Kenneth Holmström, Michael Saunders, ...
Abstract: A procedure for global optimization of PID type controller parameters for SISO plants with model uncertainty is presented. Robustness to the uncertainties is guaranteed by the use of...
Björn Johansson, Prof Bengt Lennartson, Bengt Lennartson, Björn Johansson, Lars Nyborg, Who Is Lars, ...
• 40 years of experience from papermaking.
Anders Hellgren, Martin Fabian, Bengt Lennartson
Abstract The supervisory control theory includes constructing a set of models of discrete event systems. These models are to operate concurrently and interact with each other. In this paper the...
Perspectives and results on the stability and stabilizability of hybrid systems (2000)
Raymond A. Decarlo, Michael S. Branicky, Stefan Pettersson, Bengt Lennartson
This paper introduces the concept of a hybrid system and some of the challenges associated with the stability of such systems, including the issues of guaranteeing stability of switched stable...
Stablity of limit cycles in hybrid systems using discrete-time lyapunov techniques (2000)
Marcus Rubensson, Bengt Lennartson
This paper concerns stability analysis of limit cycles in hybrid systems. Continuous-time hybrid systems are modeled in a discrete-time affine framework. The discrete-time approach is shown to be...
Stefan Pettersson, Bengt Lennartson
: Exponential stability of hybrid systems using a Lyapunov approach is considered in this paper. The continuous part of the hybrid system is described by nonlinear differential equations that depend...
An LMI Approach for Stability Analysis of Nonlinear Systems (1997)
Stefan Pettersson, Bengt Lennartson
This paper presents a constructive method for showing stability of nonlinear systems consisting of state-dependent weighted linear systems. This kind of system representation is common in for...
Controller Design of Hybrid Systems (1997)
Stefan Pettersson, Bengt Lennartson
In this paper we present two strategies to design a hybrid controller for a system described by several nonlinear vector fields. Besides the overall goal to find a controller that stabilizes the...
An LMI Approach for Stability Analysis of Nonlinear Systems (1997)
Stefan Pettersson, Bengt Lennartson
In this paper we present a method to analyze stability for nonlinear systems consisting of weighted linear subsystems. A large class of nonlinear systems can be represented in this way, e.g. weighted...
Controller Design of Hybrid Systems (1997)
Stefan Pettersson, Bengt Lennartson
. In this paper we present two strategies to design a hybrid controller for a system described by several nonlinear vector fields. Besides the overall goal to find a controller that stabilizes the...
Exponential Stability Analysis of Nonlinear Systems using LMIs (1997)
Stefan Pettersson, Bengt Lennartson
This paper presents a constructive method for showing exponential stability of autonomous nonlinear systems consisting of state-dependent weighted linear systems. This kind of system representation...
Control of Multirate Sampled-Data Systems: A Riccati Equation Solution (1997)
Mats Sagfors, Hannu T. Toivonen, Bengt Lennartson
A Riccati-equation based state-space solution to the H1 -optimal control problem for periodic multirate sampled-data systems is presented. The solution is characterized by two standard discrete...
Stability and robustness for hybrid systems (1996)
Stefan Pettersson, Bengt Lennartson
Stability and robustness issues for hybrid systems are considered in this paper. General stability results that are extensions of classical Lyapunov theory have recently been formulated. However,...
Modelling, Analysis Synthesis of Hybrid Systems (1996)
Stefan Pettersson, Bengt Lennartson
This paper deals with modelling, analysis and synthesis of hybrid systems. The model presented is quite general in the sense that it can describe most of the phenomena that occur in hybrid systems....
LMI for Stability and Robustness of Hybrid Systems (1996)
Stefan Pettersson, Bengt Lennartson
This paper presents results for stability and robustness of hybrid systems consisting of nonlinear subsystems. Present stability results that are extensions of classical Lyapunov theory are...
LMI for Stability and Robustness of Hybrid Systems (1996)
Stefan Pettersson, Bengt Lennartson
This paper presents results for stability and robustness of hybrid systems consisting of nonlinear subsystems. Present stability results that are extensions of classical Lyapunov theory are...
Stability And Robustness For Hybrid Systems (1996)
Stefan Pettersson, Bengt Lennartson
Stability and robustness issues for hybrid systems are considered in this paper. Present stability results, that are extensions of classical Lyapunov theory, are not straightforward to apply in...
Time-Optimal Control and Disturbance Compensation for a Class of Hybrid Systems (1995)
Stefan Pettersson, Bengt Lennartson
In this paper the design of a time-optimal controller for a class of hybrid systems where the continuous part is modelled by integrator processes is outlined. The controller may be used for classical...
Hybrid Modelling focused on Hybrid Petri Nets (1995)
Stefan Pettersson, Bengt Lennartson
In the present paper, a general hybrid model is proposed, including vector-field switching and/or state jumps. We clearly separate the open-loop hybrid plant from the closed-loop hybrid system in...
Plant and product models for batch processes (1995)
Michael Tittus, Bo Egardt, Bengt Lennartson
An object-oriented, automata-based approach for the modelling of plant aswell as products is presented. The di erent units of a plant are modelled as nite-state automata and products are represented...
Controlling and coordinating recipes in batch applications (1995)
Michael Tittus, Martin Fabian, Bengt Lennartson
Starting with a model of the plant and a number of product speci cations (recipes), a formalism is presented to design a discrete supervisor that controls and coordinates the simultaneous execution...
Time-Optimal Control and Disturbance Compensation for a Class of Hybrid Systems (1995)
Stefan Pettersson, Bengt Lennartson
In this paper we will outline the design of a time-optimal controller for a class of hybrid systems where the continuous part is modelled by integrator processes. The controller may be used for...
Hybrid Modelling focused on Hybrid Petri Nets (1995)
Stefan Pettersson, Bengt Lennartson
In the present paper, a general hybrid model is proposed, including vector-field switching and/or state jumps. We clearly separate the open-loop hybrid plant from the closed-loop hybrid system in...
Hybrid systems in process control (1994)
Bengt Lennartson, Bo Egardt, Michael Tittus
Systems that consist of a combination of discrete and continuous features are called hybrid systems. There has been a considerable e ort to develop theoretical frameworks and models for such systems...
Towards A True Flexible Manufacturing System (1994)
Anders Adlemo, Sven-Arne Andréasson, Martin Fabian, Per Gullander, Bengt Lennartson
The paper describes the concepts that must be considered in order to achieve a flexible manufacturing system that allows introduction of new products and new resources without total reprogramming of...
On the design of stochastic control systems with multirate sampling /--by Bengt Lennartson. (1986)
Added title page in Swedish and abstract in English inserted.
Time-Optimal Control for a Class of Hybrid Systems
Stefan Pettersson, Bengt Lennartson
This paper presents an algorithm for the generation of a timeoptimal control law for a specific class of hybrid systems, namely integrator processes. The control law is generated directly from the...
Time-Optimal Control for a Class of Hybrid Systems
Stefan Pettersson, Bengt Lennartson
This report presents an algorithm for the generation of a timeoptimal control law for a specific class of hybrid systems, namely integrator processes. The control law is generated directly from the...