Publications by Roland Longchamp

RST Controller Design by Convex Optimization Using Frequency-Domain Data

Alireza Karimi, Roland Longchamp, Gorka Galdos Sanz de Galdeano

A new robust fixed-order RST controller design approach by convex optimization is proposed in this paper. Only frequency-domain data are considered in the approach for linear time-invariant single-input single-output systems. It is shown that performance s ...

2011

Interactive applications to explore the parametric space of multivariable controllers

Roland Longchamp, Yves Henri Philippe Piguet

This paper describes interactive applications used to illustrate an advanced course on multivariable control. The direct manipulation of features in graphics, such as eigenvectors in the phase plane or observer eigenvalues in the complex plane, gives the s ...

2011

H∞ Controller Design for Spectral MIMO Models by Convex Optimization

Alireza Karimi, Roland Longchamp, Gorka Galdos Sanz de Galdeano

A new method for robust ﬁxed-order H∞ controller design by convex optimization for multivariable systems is investigated. Linear Time-Invariant Multi-Input Multi- Output (LTI-MIMO) systems represented by a set of complex values in the frequency domain are ...

Elsevier2010

Robust Controller Design by Convex Optimization based on Finite Frequency Samples of Spectral Models

Alireza Karimi, Roland Longchamp, Gorka Galdos Sanz de Galdeano

Some frequency-domain controller design problems are solved using a finite number of frequency samples. Consequently, the performance and stability conditions are not guaranteed for the frequencies between the frequency samples. In this paper, all possible ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

Modeling and Control of a Magnetically Levitated Planar Motor

Alireza Karimi, Roland Longchamp, Marc Kunze, Vincent Reymond

This paper deals with the modeling and control of a magnetically levitated planar motor. The actuator considered has moving coils and stationary magnets. The principal objective is to develop a model which can be implemented in simulation. Therefore, the d ...

2009

H-infinity Controller Design for Spectral MIMO Models by Convex Optimization

Alireza Karimi, Roland Longchamp, Gorka Galdos Sanz de Galdeano

A recent method for robust fixed-order H-infinty controller design by convex optimization proposed in [1] is investigated in this paper for the tuning of multivariable controllers. Linear Time-Invariant Multi-Input Multi-Output (LTI-MIMO) systems represent ...

2009

Robust fixed-order H infinity Controller Design for Spectral Models by Convex Optimization

Alireza Karimi, Roland Longchamp, Gorka Galdos Sanz de Galdeano

A new approach for robust fixed-order

H_\infty

controller design by convex optimization is proposed. Linear time-invariant single-input single-output systems represented by a finite set of complex values in the frequency domain are considered. It is show ...

IEEE2008

Model-Free Precompensator Tuning Based on the Correlation Approach

Alireza Karimi, Roland Longchamp, Mark Edward John Butcher

High performance output tracking can be achieved by precompensator or feedforward controllers based on the inverse of either the closed-loop system or the plant model, respectively. However, it has been shown that these inverse controllers can adversely af ...

2008

Frequency Domain Controller Design by Linear Programming Guaranteeing Quadratic Stability

Alireza Karimi, Roland Longchamp, Marc Kunze

In a recent work, a frequency method based on linear programming is proposed to design fixed-order linearly parameterized controllers for stable linear multi- model SISO systems. The method is based on the shaping of the open-loop transfer functions in the ...

IEEE2008

Use of Sysquake applications in an undergraduate control course

Roland Longchamp, Yves Henri Philippe Piguet

This paper describes how an undergraduate control course is enhanced with Sysquake interactive applications. Basic concepts in control theory, different ways to assess performance and robustness of a controlled system, and limits of closed-loop systems are ...

2008

Roland Longchamp

Graph Chatbot

Chat with Graph Search

RST Controller Design by Convex Optimization Using Frequency-Domain Data

Interactive applications to explore the parametric space of multivariable controllers

H∞ Controller Design for Spectral MIMO Models by Convex Optimization

Robust Controller Design by Convex Optimization based on Finite Frequency Samples of Spectral Models

Modeling and Control of a Magnetically Levitated Planar Motor

H-infinity Controller Design for Spectral MIMO Models by Convex Optimization

Robust fixed-order H infinity Controller Design for Spectral Models by Convex Optimization

Model-Free Precompensator Tuning Based on the Correlation Approach

Frequency Domain Controller Design by Linear Programming Guaranteeing Quadratic Stability

Use of Sysquake applications in an undergraduate control course

Robust Controller Design by Convex Optimization based on Finite Frequency Samples of Spectral Models

Use of Sysquake applications in an undergraduate control course

Frequency Domain Controller Design by Linear Programming Guaranteeing Quadratic Stability

RST Controller Design by Convex Optimization Using Frequency-Domain Data

H∞ Controller Design for Spectral MIMO Models by Convex Optimization

Modeling and Control of a Magnetically Levitated Planar Motor

Interactive applications to explore the parametric space of multivariable controllers

Model-Free Precompensator Tuning Based on the Correlation Approach

Robust fixed-order H infinity Controller Design for Spectral Models by Convex Optimization

H-infinity Controller Design for Spectral MIMO Models by Convex Optimization