Dr Emmanuel Prempain

Lecturer

Control and Instrumentation Research Group

T: 1300 (ext) F:  2619 (ext)
E: ep26\@leicester.ac.uk

Location: Room 903, Engineering Tower

Research interests

H-infinity and Robust Control Methods

Robust Gain Scheduling LPV/LFT

Linear Matrix Inequalities (LMIs)

Flight Control Systems (Helicopter, Aircraft Autopilots, UAVs)

Non-linear Control (sum-of-square analysis, feedback linearization)

 

My research interests are primarily in the areas of control and the application of convex optimization for control system analysis and synthesis. I am interested in robust gain scheduling, robust tracking, fixed-order synthesis control within the Linear Matrix Inequality framework. I have a significant experience in the design of controllers for Aerospace Systems (helicopter control, re-entry space vehicle control and autopilots) and more generally in the application of linear matrix optimization techniques to complex systems.

 

“Scheduling of Dynamic Controllers” is a collaborative research project between Leicester, SUPELEC (France). MoD and DGA (France) Leicester’s research work is focusing on the development of global processes and associated computer tools for flight control system designs. Advanced gain-scheduled and anti-windup compensation control techniques will be used to ensure stability and performance of the controlled system over its flight envelope. The objective is to devise processes for designing dynamic controllers able to operate over a large flight envelope. Tools for system performance analysis, able to take into account non-linearities such as actuator rate limits and parameter variations will also be developed.

 

Within a Discipline Hopping Award in Systems Biology, I worked on modelling cochlear dynamics from measured data and first fluid dynamics principles. In particular, Linear Fractional Transformation (LFT) formalism, well-known in robust control theory, was found to be a useful mathematical tool for modelling and analysing the complex cochlear dynamical behaviour.

 

Research project NEPTUNE integrates various aspects of water management and intends to improve water networks by minimising leakage, redundant and unnecessary transfer of water or storage and hence saving resources. At Leicester, we are seeking new pressure management strategies to improve customer service (continuity in supply, pressure and fewer interruptions) and to reduce energy usage and water losses. In this project, Leicester has developed tools for local control pressure management

 

Research grants and contracts

Principal investigator (Leicester) with Dr. M. C. Turner and Prof. Ian Postlethwaite , MBDA (France/UK),  DGA/DSTL, “Dynamic Controllers”, £178K 15/10/08

Principal investigator (Leicester) and Dr. B. Lineton (University of Southampton), “Modelling cochlear gain control”, EPSRC-Collaborating for Success in Systems Biology, Discipline Hopping Awards in Systems Biology, £78K, 01/12/07

Co-investigator with Prof. D.G. Bates (Leicester), DEIMOS Space (Spain) and the Technical University of Delft (The Netherlands), ESA, “Robust LPV Gain-Scheduling Techniques for Space Applications”, 55K Euros, 23/02/07

Co-investigator with Prof. Ian Postlethwaite (PI at Leicester) EPSRC “Delivering sustainable water systems by optimising existing infrastructure via improved knowledge, understanding and technology – project NEPTUNE”, £203K, 23/03/07

Principal investigator, University of Liverpool, Research and Development fund, £5.6K, 01/10/02

Grant holder of a Marie Curie Research Fellowship (TMR), “Simultaneous H-infinity stabilization”, European Commission, £31K, 01/10/97

 

Awards/ Prizes

IFAC Automatica Best Paper Prize awarded in Seoul at the IFAC Journal Award Ceremony in July 2008 for paper “Static H-infinity loop shaping control of a fly-by-wire helicopter”, by Emmanuel Prempain and Ian Postlethwaite, Vol. 41(9), September 2005, pp. 1517-1528. Best application paper over the period 2005-2008

 

Invited Lectures

In workshop “Linear Matrix Inequalities in Control (LMI04)”, 1-2 July 2004, LAAS-CNRS, Toulouse, France, http://www.laas.fr/~henrion/lmi04/


Publications

Journal Articles

E. Prempain, M.C. Turner and Ian Postlethwaite E. Prempain, “Coprime factor based anti-windup synthesis for parameter-dependent systems”, Systems & Control Letters (2009), in press, corrected proof, available online 17 October 2009, doi:10.1016/j.sysconle.2009.09.002

E. Prempain and I. Postlethwaite, “L2 and H2 Performance Analysis and Gain-Scheduling Synthesis for Parameter-Dependent Systems”, Automatica, 44(8), August 2008, pp. 2081-2089

E. Prempain "Discussion on: Design of Low Order Robust Controllers for a VSC HVDC Power Plant Terminal", European Journal of Control, 13(5), August2007, pp. 554

E. Prempain and I. Postlethwaite, “Static H-infinity loop shaping control of a fly-by-wire helicopter”, Automatica, 41(9), September 2005, pp. 1517-1528. IFAC Automatica, Best Paper Award

I. Postlethwaite, E. Prempain, E. Turkoglu, M. C. Turner, K. Ellis and A. W. Gubbels , “Design and flight  testing of various H-infinity controllers for the Bell 205 helicopter”, Control Engineering Practice, 13(3), March 2005, pp. 383-398

S. He, E. Prempain, Q. H. Wu, “An Improved Particle Swarm Optimizer for Mechanical Design Optimization Problems”, Engineering Optimization, 36(5), October 2004, pp. 585-605.     

E. Prempain and I. Postlethwaite and A. Benchaib, “A Linear Parameter Variant H-infinity Control Design for an Induction Motor”, Control Engineering Practice, 10(6), June 2002, pp. 633-644

E. Prempain and I. Postlethwaite, “Feedforward Control: A Full Information Approach”, Automatica, 37(1), January 2001, pp 17-28

E. Prempain and I. Postlethwaite, “Static Output Feedback Stabilization with H-infinity Performance for a Class of Plants”, Systems & Control Letters, 43(3), 2001, pp. 159-165

E. Prempain, I. Postlethwaite and X. D. Sun, “Robust control of a gasifier using a mixed-sensitivity H-infinity approach”, Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 214(6), 2001, pp. 415-426

E. Prempain and I. Postlethwaite  “A New two-degree-of-freedom gain scheduling method applied to the Lynx MK7”, Proceedings of the Institution of Mechanical Engineers. Part I: Journal of Systems and Control Engineering, 214(4), 2000, pp. 299-311

 E. Prempain and B. Bergeon, “A Multivariable two-degree-of-freedom control methodology”, Automatica, Vol. 34(12), December 1998, pp. 1601-1606

 E. Prempain et B. Bergeon, “Méthodologie R2M2 Multivariable”, Revue Automatique Productique Informatique Industrielle, Vol. 29(6), 1995, Ed. Hermès, pp. 655-678

Book Chapter

 E. Prempain and I. Postlethwaite (2007), “Output Feedback H-Infinity Loopshaping Controller Synthesis”, in Mathematical Methods for Robust and Nonlinear Control, M. C. Turner and D. G. Bates (Eds.), Springer-Verlag Lecture Notes in Control and Information Sciences Series, ISBN: 978-1-84800-024-7, November 2007

 

International Conferences

Zolghadri A., E. Prempain, M. Monsion, B. Bergeon, “Local path planning for a robotic contour following problem”,  Second International Conference on Automation, Robotics and Computer Vision, Singapore, 15-18, September 1992

E. Prempain and B. Bergeon, ”Robust tracking via the Robust Multiple Reference Model”, European Control Conference, v 1, p.584-589, Roma, 5-8 September 1995

E. Prempain and B. Bergeon, “Multivariable Two degree of Freedom Controller Methodology: The R2M2 approach”, IFAC Conf. on System Structure and Control, v 1, p 426-431, Nantes 5-7 July 1995

E. Prempain and B. Bergeon (1996). An Initialization Procedure for the D-K iteration Algorithm for a Class of Problems. 13th IFAC 96 World Congress. San Francisco, USA, 30 June - 5 July 1996

E. Prempain, I. Postlethwaite and X. D. Sun (1998). MEC Benchmark Challenge: Robust Control of a Gasifier using a Mixed Sensitivity Approach, University of Coventry, Coventry, June 1998

E. Prempain and I. Postlethwaite (1999). Extended LMI Projection Conditions. CDC’99, Phoenix, December 1999

E. Prempain and I. Postlethwaite (2000). A Gain-Scheduled Approach Applied to the Lynx Mk7. Control 2000, Cambridge, September 2000

E. Prempain and I. Postlethwaite  and D. Vorley (2001). A Gain- Scheduled Autopilot Design for a Bank-to-Turn Missile.  ECC’01, Porto, September 2001

E. Prempain, F. Madelaine and S. Charmail (2001). Control of a plant with a time delay.  ECC 01. Porto, September 2001

E. Prempain and I. Postlethwaite  and D. Vorley (2002). Autopilot Study for an Asymmetric Airframe. IFAC World Congress 02, Barcelona, July 2002

I. Postlethwaite, E. Prempain, E. Turkoglu and M. Turner (2002). Various H-infinity Controllers for the Bell 205: Design and Flight Test.  IFAC World Congress 02, Barcelona, July 2002

E. Prempain  and I. Postlethwaite (2002) “H-infinity Design for an Induction Motor”,  IFAC World Congress 02, Barcelona, July 2002

I. Postlethwaite, E. Prempain, E. Turkoglu and M. Turner, “Design and Flight Test of various H-infinity controllers for the Bell 205”, NATO Workshop, August 2002

E. Prempain and I. Postlethwaite , “Static H-infinity loop shaping control of a fly-by-wire helicopter”, IEEE CDC’04, December 2004

E. Prempain (2004), “Static H-infinity Control”, Control 2004, Bath, September 2000

He, S., Wen, J.Y., Prempain, E., Wu, Q.H., Fitch, J., 'An improved particle swarm optimzation for optimal power flow', (2004) International Conference on Power System Technology, The Pan Pacific, Singapore,F1628-2E2J(1-5), 21-24 Nov 2004

E. Prempain and M. O. Dzeukou (2005), “Low order Control Augmentation System Designs for the Helicopter UH-60”, IFAC World Congress, Prague, July 2005

E. Prempain (2005), “A Comparison of two Algorithms for the Static H-infinity Loop Shaping Problem”, IFAC World Congress, Prague, July 2005

W.H. Tang, S. He, E. Prempain, Q.H. Wu and J. Fitch (2005) “A particle swarm optimizer with passive congregation approach to thermal modeling for power transformers”, IEEE CEC, 2005

E. Prempain “An Application of the Sum of Squares Decomposition to the L2 Gain Computation for a Class of Non Linear Systems” (2005), IEEE ECC-CDC’05, Seville, Spain, December 2005

E. Prempain. “Coprime factorizations for parameter-dependent systems” Proceedings of ROCOND'06, Toulouse, July 2006

E. Prempain. “Gain scheduling H-infinity loop shaping control for linear parameter-varying systems”, Proceedings of ROCOND'06, Toulouse, July 2006

E. Prempain. “On Coprime Factorizations for Parameter-dependent Systems”. Proceedings of the 45th IEEE Conference on Decision and Control, San Diego, CA, USA, December 2006

E. Prempain, P. P. Menon, I.  Postlethwaite and D. G. Bates  “A LOW-ORDER LINEAR PARAMETER VARYING H LOOP SHAPING CONTROLLER FOR A RE-ENTRY VEHICLE”, 7th International ESA Conference on Guidance, Navigation &Control Systems, 2-5 June 2008, Tralee, Ireland 200

E. Prempain and I. Postlethwaite, “A Feed-forward Control Synthesis Approach for LPV Systems”, ACC’08, Seattle, June 2008

E. Prempain and I. Postlethwaite “A Constant D-scale mu-Synthesis Approach based on Nonsmooth Optimization”, IFAC World Congress, Seoul, Korea, July 2008

P. Li, I. Postlethwaite, E. Prempain and B. Ulanicki, “A new control scheme for improving the performance of pressure reducing valves in water distribution networks”, 8th International Conference on Hydro-informatics 2009, Conception, Chile, 12-16 January 2009.

P. Li, I. Postlethwaite, E. Prempain, B. Ulanicki and R. Patel, “Identification of the hydraulic model from operational measurements for supervisory pressure control”, accepted for World Environmental & Water Resources Congress, Kansas, 17-21 May 2009

E. Prempain, M. C. Turner, I. Postlethwaite,  G. Sandou, G. Duc, D. Vorley and J.P. Harcaut “H-infinity Missile Autopilot Design in the Presence of Actuator Rate Saturations”, MCM-ITP Conference, Lille, France, 22-23, June 2009

P. Menon, E. Prempain, I. Postlethwaite, D Bates, S. Bennani,  “An LPV loop shaping controller design for the NASA-HL-20 re-entry vehicle”, AIAA Guidance, Navigation and Control Conference, Chicago, USA, August 2009

P. Menon, E. Prempain, I. Postlethwaite, D Bates, S. Bennani, “Nonlinear Worst-Case Analysis of an LPV Controller for Approach-Phase of a Re-Entry Vehicle”, AIAA Guidance, Navigation and Control Conference, Chicago, USA, August 2009

E. Prempain and B. Lineton, “Cochlear modelling using a Linear Fractional Transformation Approach”, ICCAS-SICE, Fukuoka, Japan, 18-21, August 2009

P. Li, I. Postlethwaite, E. Prempain and B. Ulanicki, “Flow modulated dynamic pressure control with Aquai-Mod controller”, CCWI Conference, Sheffield, 1-3, September 2009

 

Internships
Various students from ISAE and INSA, Toulouse, France

1 http://www.isae.fr/en/index.html

2 http://www.insa-toulouse.fr/en/index.html


Teaching

EG1070: Mathematics 2, 1st year

EG4120: Robust Control, MSc, (2006, 2007)  

EG4160: Advanced Engineering Dynamics, (from 2007)

In charge of the online EG1010/70 computer tests in both semesters (since Oct. 2008)

Other

Associate editor for JESA http://jesa.revuesonline.com/

 

 

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