Dr Johan Löfberg, Research Associate

After graduating in 2003 on Minimax Approaches to Robust Model Predictive Control, and spending three years as a post-doc at the Automatic Control laboratory at ETH, Zurich, I am currently back in Linköping as a research associate in the control group.
My research interest lies in the border between control theory and optimization. I was earlier heavily focused on applications of optimization methods in model predictive control, but now prefer a slightly broader perspective.
A common factor in most of my work is the development of control-oriented optimization-based algorithms, leading to the constant evolution of a MATLAB based modelling language, called YALMIP.

Some recent work

• H. Manum and C. Jones and J. Löfberg and M. Morari and S. Skogestad, Bilevel Programming for Analysis of Low-Complexity Control of Linear Systems with Constraints. Accepted for CDC 2009
• Th. Besselmann and J. Löfberg and M. Morari, Constrained Time-Optimal Control of Linear Parameter-Varying Systems. Accepted for CDC 2009
• D. Petersson and J. Löfberg, Optimization based LPV-approximation of multi-model systems. ECC 2009
• Th. Besselmann and J. Löfberg and M. Morari, Explicit LPV-MPC with Bounded Rate of Parameter Variation, ROCOND 2009
• D. Henrion and J.-B. Lasserre and J. Löfberg, GloptiPoly 3: moments, optimization and semidefinite programming, Optimization Methods and Software, Volume 24, Issues 4-5, August 2009
• J. Löfberg, Dualize it: Software for automatic primal and dual conversions of conic programs, Optimization Methods and Software, Volume 24, Issue 3, 2009.
• J. Löfberg, Pre- and post-processing sum-of-squares problems in practise, IEEE Transactions on Automatic Control, Volume 54, Issue 5
• Th. Besselmann and J. Löfberg and M. Morari, Explicit model predictive control for linear parameter-varying systems, CDC 2008
• J. Löfberg, Comment on "A unified approach for circularity and spatial straightness evaluation using semi-definite programming": by Ye Ding, LiMin Zhu, Han Ding. International Journal of Machine Tools & Manufacture, 47(10):1646--1650, 2007., International Journal of Machine Tools and Manufacture, Volume 48, Issues 12-13
• Th. Besselmann and J. Löfberg and M. Morari, Explicit Model Predictive Control for systems with linear parameter-varying state transition matrix, IFAC 2008.
• J. Löfberg, Modelling and solving uncertain optimization problems in YALMIP, IFAC 2008.
• J. Löfberg, Block diagonalization of matrix-valued sum-of-squares programs
• J. Löfberg, A symbolic and numerical framework for dynamic programming and parametric optimization. Submitted.
• E. Wernholt and J. Löfberg, Experiment Design for Identification of Nonlinear Gray-box Models with Application to Industrial Robots, CDC 2007.

Teaching

• Lecturing Introduction to MATLAB
• Lecturing Automatic control (basic course for the mechanical engineering program)

Master thesis supervisor

• Håkan Almqvist, Automatic bucket fill
• Fredrik Petersson, Modelling, simulation and implementation of sensor-less control of a permanent magnet synchronous motor
• Magnus Larsson, Current control in a new cooling technology
• Björn Ericsson, Model library of cooling system components for Simulink

Phd co-supervisor

• Daniel Petersson, Generation of LPV models

Future and past events

• Member of the 2010 IEEE Multi-Conference on Systems and Control international program commitee, Yokohama September 8-10, 2010.
• Presenting Robust Optimization and Uncertainty Modeling in YALMIP at the The 20th International Symposium of Mathematical Programming, August 23 - 28, 2009.
• Presenting Robust Optimization and Uncertainty Modelling in YALMIP at the Institute for Systems Theory and Automatic Control Universität Stuttgart, June 23rd 2009.
• Presenting Explicit LPV-MPC with Bounded Rate of Parameter Variation at 17th IFAC world congress, July 6-11th 2008.
• Presenting Modeling and solving uncertain optimization problems in YALMIP at the 6th IFAC Symposium on Robust Control Design , June 16-18, 2009.
• Presenting Modeling and solving uncertain optimization problems in YALMIP at the Swedish Control Meeting, June 3-5th 2008.
• Presenting Advanced optimization modeling in YALMIP at the Université catholique de Louvain, April 22nd 2008.
• Presenting Uncertainty modelling and robust optimization in YALMIP at the Second Mathematical Programming Society International Conference on Continuous Optimization, August 13-17th 2007.
• Co-organizing the MPC workshop at the 16th International Conference on Process Control, Slovakia June 11-14th 2007

Contact information

Johan Löfberg
Division of Automatic Control
Department of Electrical Engineering
Linköping University
SE-581 83 Linköping
Sweden

B-building, room Bv2A:536, tel: +46 13-284029
fax: +46 13-282622
johanl@isy.liu.se

Private address
Ramshult Södergård
SE-59591 Mjölby
Sweden