# Dr. Roger Ngwompo

## Diplôme d’ingénieur INSA (France) PhD

## Profile

Dr Roger Ngwompo is in charge of the Engineering with French programmes. He is affiliated with the Centre for Power Transmission and Motion Control. His research work involves the modelling, simulation and control of dynamic systems with particular interest in models inversion and its applications.

Dr Roger Ngwompo received the “Diplôme d’Ingénieur” degree in Electrical Engineering from INSA Toulouse in 1990, France and a PhD in Control Systems from INSA Lyon, France in 1997. He worked as a Field Engineer for Schlumberger Wireline & Testing in 1991-1992, and as a Research Officer at the “Laboratoire d’Automatique Industrielle” in Lyon in from 1997 before joining the University of Bath as a Lecturer in 1999.

## Research

Dr Ngwompo research work involves developing novel techniques for the modelling, analysis and simulation of dynamic systems. He has a particular interest in the bond graph modelling technique which is an energy-based method that enables graphical representation, analysis and automated generation of mathematical models for multi-domain engineering systems. An aircraft is a typical example of such complex systems and a collaborative links with Airbus UK has been established to develop models for conceptual and detailed design of various aircraft functions.

He is also involved in the theory of systems inversion with applications to dynamic systems synthesis, selection and sizing of components, analysis, fault detection and control.

## Teaching units

- Mechanical Engineering with French Units,
- Electronics and Electric Drives,
- Modelling and Simulation.

## Publications

## Book Sections

Margetts, R., Ngwompo, R. F. and Fortes da Cruz, M., 2013. Modelling a drop test of a landing gear using a hybrid bond graph. *In*: Klement, E. P., Borutzky, W., Fahringer, T., Hamza, M. H. and Uskov, V., eds. *Proceedings of the IASTED International Conference on Modelling, Identification and Control.* Anaheim: ACTA Press, pp. 312-317.

## Articles

Ngwompo, R. F. and Galindo, R., 2017. Passivity analysis of linear physical systems with internal energy sources modelled by bond graphs. *Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering*, 231 (1), pp. 14-28.

Margetts, R. and Ngwompo, R. F., 2015. Mode switching in causally dynamic hybrid bond graphs. *Mechatronics*, 28, 1725.

Margetts, R., Ngwompo, R. F. and Fortes da Cruz, M., 2013. Construction and analysis of causally dynamic hybrid bond graphs. *Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering*, 227 (3), pp. 329-346.

Lin, J., Ngwompo, R. F. and Tilley, D. G., 2012. Development of a cardiopulmonary mathematical model incorporating a baro-chemoreceptor reflex control system. *Proceedings of the Institution of Mechanical Engineers, Part H - Journal of Engineering in Medicine*, 226 (10), pp. 787-803.

Ngwompo, R. F., 2012. Bond graph-based filtered inversion of multivariable physical systems. *Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering*, 226 (1), pp. 125-140.

Magee, P. T. and Ngwompo, R., 2011. The use of 'Bath fp' software, an engineering model, to study the coaxial circle breathing system. *Anaesthesia*, 66 (Supplement 1), p. 28.

Margetts, R. and Ngwompo, R. F., 2010. Comparison of modeling techniques for a landing gear. *Proceedings of the ASME International Mechanical Engineering Congress & Exposition IMECE, 2010*, 8 (Part A & B), pp. 329-335.

Li, P. Y. and Ngwompo, R. F., 2005. Power scaling bond graph approach to the passification of mechatronic systems - With application to electrohydraulic valves. *Journal of Dynamic Systems Measurement and Control - Transactions of the ASME*, 127 (4), pp. 633-641.

Ngwompo, R. F., Scavarda, S. and Thomasset, D., 2001. Physical model-based inversion in control systems design using bond graph representation Part 1: theory.

Ngwompo, R. F., Scavarda, S. and Thomasset, D., 2001. Physical model-based inversion in control systems design using bond graph representation Part 2: applications.

Ngwompo, R. F. and Scavarda, S., 1999. Dimensioning problems in system design using bicausal bond graphs. *Simulation Practice and Theory*, 7 (5-6), pp. 577-587.

Ngwompo, R. F. and Gawthrop, P. J., 1999. Bond graph based simulation of nonlinear inverse systems using physical performance specifications. *Journal of the Franklin Institute: Engineering and Applied Mathmatics*, 336 (8), pp. 1225-1247.

Ngwompo, R. F., Scavarda, S. and Thomasset, D., 1996. Inversion of Linear Time-invariant SISO Systems Modelled by Bond Graph. *Journal of the Franklin Institute: Engineering and Applied Mathmatics*, 333 (2), pp. 157-174.

## Conference or Workshop Items

Galindo, R. and Ngwompo, R., 2016. A Bond Graph Pseudo-Junction Structure for Non-Linear Non-conservative Systems. *In*: *UKACC International Conference on Control*, 2016-08-31 - 2016-09-02, Queen's University.

Madrigal Salas, J. and Ngwompo, R. F., 2015. Modelling and analysis of hybrid physical systems using bond graph and dynamic causality. *In*: Al-Akaidi, M. and Ayesh, A., eds. *29th Annual European Simulation and Modelling Conference 2015, ESM 2015*, 2015-10-26 - 2015-10-28. EUROSIS, pp. 16-21.

El Feki, M., Di Loreto, M., Bideaux, E., Thomasset, D. and Ngwompo, R., 2008. Structural properties of inverse models represented by bond graph. *In*: *17th IFAC World Congress*, 2008-07-06 - 2008-07-11. International Federation of Automatic Control, pp. 236-241.

Lin, J., Tilley, D. G. and Ngwompo, R. F., 2006. Development of a Cardiovascular Model with baroreceptor Reflex. *In*: *2006 European Simulation and Modelling Conference*, 2006-10-01.

Ngwompo, R. F. and Bideaux, E., 2005. On the role of power lines and causal paths in bond graph ? based model inversion. *In*: *Proceedings of the Int. Conf. on Bond Graph Modeling and Simulation*, 2005-01-01.

Ngwompo, R. F., Guglielmino, E. and Edge, K. A., 2004. Performance enhancement of a friction damper system using bond graphs. *In*: *ASME Conference on Engineering Systems Design and Analysis*, 2004-07-01.

Diaz-Cuevas, G. L. and Ngwompo, R. F., 2003. Bond Graph Binary Encoding Method for Genetic Algorithms Applications. *In*: *Proceedings of the ASME International Mechanical Engineering Congress*, 2003-01-01.

Li, P. Y. and Ngwompo, R. F., 2002. Passification of electrohydraulic valves using bond graphs. *In*: *IFAC World Congress*, 2005-01-01.

Scavarda, S., Bideaux, E., Sesmat, S. and Ngwompo, R. F., 1997. An overview of recent developments in bond graph modeling shown in a Fluid Power context. *In*: Burrows, C. R. and Edge, K. A., eds. *Fluid Power Engineering: Challenges and Solutions: Tenth International Fluid Power Workshop*, 1997-09-01.

Bouri, M., Thomasset, D. and Ngwompo, R. F., 1996. Nonlinear sliding mode control synthesis with electropneumatic application. *In*: *Computational Engineering in Systems Applications IMACS/IEEE-SMC Multiconference*, 1996-07-01.