Prof JD le Roux (Derik)

Position

Associate Professor

Qualifications

B.Eng.Electronic (Pret) 
B.Eng.(Hons) Electronic (Pret) 
M.Eng. Electronics (Pret)
PhD Electronics (Pret)

Professional Status

Registered as Professional Engineering since 2020 (ECSA).

NRF Rating: Y1

Teaching

Undergraduate
- Control Systems EBB320
- Electricity and Electronics EBN111/EBN122
- Electrical Engineering EIR211/EIR221

Postgraduate
- Optimal Control EBO780

Membership

South African Council for Automation and Control (SACAC):
- Executive Committee Member (2014 - Present)
- Treasurer (2015 - Present)

International Federation of Automatic Control (IFAC)
- Member of IFAC Technical Committee 6.2. (2017 - Present)
- Member of IFAC Publication Board (2017 - Present)
- Chair of IFAC Database Task Force (2019 - Present)

Member of Early Career Advisory Board for Control Engineering Practice (2021-Present)
Senior Member of SAIEE (2021-Present)

Research

Research Group 

Control Systems

Research Topics

The aim is to provide solutions for the implementation of industrial advanced process control for the mineral processing industry. The specific focus is on:

  • plant-wide control strategies,
  • control-relevant nonlinear process models,
  • model-based controller design, and
  • state and parameter estimation.

ORCID: 0000-0002-6306-1949

Google Scholar: Johan Derik le Roux

Recent Journal Publications:

  • Ziolkowski, L., le Roux, J.D., Craig, I.K., 2022, "Extremum seeking control for optimization of an open-loop grinding mill using grind curves", Journal of Process Control, 114, 54-70
  • Strydom, D, le Roux, J.D., Craig, I.K., 2022, "State estimation for nonlinear state-space transmission models of tuberculosis", Risk Analysis, (Early View).
  • Brooks, K., le Roux, J.D., Shardt, Y.A.W., Steyn, C., 2021, "Comparison of Semirigorous and Empirical Models Derived Using Data Quality Assessment Methods", Minerals, 11, 954.
  • Wiid, A.J., Le Roux, J.D., Craig, I.K., 2021, "Pressure buffering control to reduce pollution and improve flow stability in industrial gas headers", Control Eng. Prac., 115, 104904.
  • Oosthuizen, D.J., Le Roux, J.D., Craig, I.K., 2021, "A dynamic flotation model to infer process characteristics from online measurements", Minerals Eng., 167, 106878.
  • Wiid, A.J., Le Roux, J.D., Craig, I.K., 2021, "Pressure measurement location selection in industrial gas headers for buffering control", Comp. Chem. Eng., 145, 107178.
  • Wiid, A.J., Le Roux, J.D., Craig, I.K., 2020, "Modelling of methane-rich gas pipeline networks for simulation and control", J. Process Control, 92, pp. 234-245.
  • Le Roux, J.D., Steinboeck, A., Kugi, A., Craig, I.K., 2020, "Steady-state and dynamic simulation of a grinding mill using grind curves", Minerals Eng., 152, 106208.
  • Le Roux, J.D., Craig, I.K., 2019, “A plant-wide control framework for a grinding mill circuit”, Ind. Eng. Chem. Res., 58 (26), pp. 11585-11600.
  • Botha, S., Le Roux, J.D., Craig, I.K., 2018, “Hybrid non-linear model predictive control of a run-of-mine ore grinding mill circuit”, Minerals Eng., 123, pp. 49-62.
  • Aguila-Camacho, N., Le Roux, J.D., Duarte-Mermoud, M.A., Orcharda, M.E., 2017, “Control of a grinding mill circuit using simple fractional order controllers”, J. Process Control, 53, pp. 80-94.
  • Le Roux, J.D., Steinboeck, A., Kugi, A., Craig, I.K., 2017, “An EKF observer to estimate semi-autogenous grinding mill hold-ups”, J. Process Control, 51, pp. 27-41.
  • Le Roux, J.D., Olivier, L.E., Naidoo, A.M., Padhi, R., Craig, I.K., 2016, “Throughput and product quality control for a grinding mill circuit using Nonlinear MPC”, J. Process Control, 42, pp. 35-50.
  • Le Roux, J.D., Padhi, R., Craig, I.K., 2014, “Optimal Control of Grinding Mill Circuit using Model Predictive Static Programming: A New Nonlinear MPC Paradigm”, J. Process Control, 24, pp. 29-40.
  • Le Roux, J.D., Craig, I.K., 2013, “Reducing the number of size classes in a cumulative rates model used for process control of a grinding mill circuit”, Powder Tech., 246, pp. 169-181.
  • Le Roux, J.D., Craig, I.K., Hulbert, D.G., Hinde, A.H., 2013., “Analysis and validation of a run-of-mine ore grinding mill circuit model for process control”, Minerals Eng., 43-44, pp. 121-134.

Recent Conference Publications:

  • Wepener, D.A., Le Roux, J.D., Craig, I.K., 2021, “Disturbance Propagation Through a Grinding-Flotation Circuit”, IFAC-PapersOnLine, 54 (21), pp. 19-24.
  • Wiid, A.J., Le Roux, J.D., Craig, I.K., 2021, “Decentralised Model Predictive Control for Parallel Unit Operation Optimisation”, IFAC-PapersOnLine, 54 (21), pp. 139-144.
  • Ziolkowski, J.D. le Roux, I.K. Craig, 2021, “Optimizing grinding mill performance using extremum seeking control”, IFAC-PapersOnLine, 54 (11), pp.43-48.
  • Sekila, K., Le Roux, J.D., 2021, “Reconstructing faulty measurements at a tailings treatment surge tank”, IFAC-PapersOnLine, 54 (11), pp. 79-84.
  • Bauer, M., Brooks, K., Burchell, J., Coetzee, L., le Roux, J.D., McCoy, J., Miskin, J., Winter, D., 2020, “The Use of a Semi-Rigorous SAG Mill Model for a Hands-On Workshop”, IFAC-PapersOnLine, 53 (2), p. 11889-11894.
  • Le Roux, J.D., Hadler, K., Cilliers J.J., Craig, I.K., “Observer analysis of a dynamic tank-to-tank model to estimate concentrate flow-rate”, In: Proceedings of IMPC 2020: XXX International Mineral Processing Congress, Cape Town, South Africa, 18-22 October 2020, pp. 1510-1517.
  • Le Roux, J.D., Steyn, C.W., “Dynamic modelling of a ball mill circuit for controller design”, In: Proceedings of IMPC 2020: XXX International Mineral Processing Congress, Cape Town, South Africa, 18-22 October 2020, pp. 469-477.
  • Le Roux, J.D., Craig, I.K., 2019, "State controllability of a froth flotation cell", IFAC-PapersOnLine, 52 (14), pp. 54-59.
  • Maritz, M.G., Le Roux, J.D., Craig, I.K., 2019, "Feed Size Distribution Feedforward Control for a Grinding Mill Circuit", IFAC-PapersOnLine, 52 (14), pp. 7-12.
  • Wiid, A.J., le Roux, J.D., Craig, I.K., 2019, “Non-linear Modelling and Validation of an Industrial Methane Rich Gas Network for Control Applications”, 18th European Control Conference (ECC), Naples, Italy, pp. 3126-3131.
  • Burchell, J.J., le Roux, J.D., Craig, I.K., 2018, “Optimised Blending of a Base Metal Refinery Feed Using Evolutionary Programming”, IFAC-PapersOnLine, 51 (21), pp. 268-272.
  • Sun, B., le Roux, J.D., Jämsä-Jounela, S.L., Craig, I.K., 2018, “Optimal control of a rougher flotation cell using adaptive dynamic programming”, IFAC-PapersOnLine, 51 (21), pp. 24-29.
  • Dzedzemane, R., le Roux, J.D., Craig, I.K., 2018, “Steam header state-space model development and validation”, IFAC-PapersOnLine, 51 (21), pp. 207-212.
  • Bauer, M., Auret, L., le Roux, J.D., Aharonson, V., 2018, “An Industrial PID Data Repository for Control Loop Performance Monitoring (CPM)”, IFAC-PapersOnLine, 51 (4), pp. 823-828.
  • Burchell, J.J., Le Roux, J.D., Craig, I.K., 2017, “Plant-wide control of a base metal refinery: Top-down analysis”, IFAC-PapersOnLine, 50 (2), pp. 59-64.
  • Le Roux, J.D., Craig, I.K., 2017, “Requirements for estimating the volume of rocks and balls in a grinding mill”, IFAC-PapersOnLine, 50 (1), pp. 1169-1174.
  • Le Roux, J.D., Craig, I.K., 2016, “State and parameter identifiability of a nonlinear grinding mill circuit model”, IFAC-PapersOnLine 49 (20), pp. 1-6.
  • Le Roux, J.D., Skogestad, S., Craig, I.K., 2016, “Plant-wide control of grinding mill circuits: Top-down analysis”, IFAC-PapersOnLine 49 (20), pp. 72-77.
  • Le Roux, J.D., Steinboeck, A., Kugi, A., Craig, I.K., 2016, “Nonlinear observability of grinding mill conditions”, IFAC-PapersOnLine 49 (20), pp. 13-18.
  • Botha, S., Craig, I.K., Le Roux, J.D., 2015, “Switching cyclones to increase product particle size range for ore milling circuits”, IFAC-PapersOnLine 48 (17), pp. 92-97.
  • Le Roux, J.D., Craig, I.K., Padhi, R., 2014, “Output Tracking for a Milling Circuit using Model Predictive Static Programming”, IFAC Proceedings Volumes 47 (3), pp. 9792-9797.
  • Le Roux, J.D., Craig, I.K., Padhi, R., 2013, “State and Parameter Estimation for a Grinding Mill Circuit from Operational Input-Output Data”, IFAC Proceedings Volumes 46 (32), pp. 178-183.
  • Le Roux, J.D., Craig, I.K., 2012, “Size class reduction in a cumulative rates model for a grinding mill circuit”, IFAC Proceedings Volumes 45 (23), pp. 66-71.
  • Le Roux, J.D., Craig, I.K., 2012, “Analysis and validation of a run-of-mine ore grinding mill circuit model”, presented at 8th International Comminution Symposium (Comminution '12), Cape Town, South Africa, April 17-20, 2012.
  • Le Roux, J.D., Craig, I.K., 2011, “Identifiability of run-of-mine ore grinding mill circuit parameters,” 10th IEEE Region 8 Africon 2011 Conference, Livingstone, Zambia, 13-15 Sept. 2019, 1-6.

National and International Participation

National

Presenter at Workshops

  • “Observer Design Workshop”, presented by SACAC in 2016/2018/2021 (CPD accredited workshop: SAIEE-1813-V).

Organizer of Seminars, Talks and Workshops

  • “Motorcycles, the science, the folklore, and going fast”, presented by SACAC, Pretoria, 1 Aug 2019.
  • “Optimal control in Formula One racing”, presented by SACAC, Pretoria, 18 Oct 2019.
  • “Seminar on Advanced Control in the Water Works”, presented by SACAC, Pretoria, 22 Sept 2017.
  • “Energy Optimisation and Management through Control”, presented by SACAC, University of Pretoria, 16 Oct. 2015.
  • “Measurement, Modelling and Control for Coal Processing”, presented by SACAC, University of Pretoria, 28 Nov. 2014.
  • “SACAC Control Systems Day”, University of Pretoria, 27 Nov. 2012.

International

Presenter at Workshops

  • “Modern Data Analytics for Control in Mineral Processing”, presented as part of MMM2019 Conference at STIAS, Stellenbosch, 26-27 August 2019 – Co-presenter. (CPD accredited workshop: SAIMC_CPD_W_472; SAIMC_CPD_W_473)
  • “The A-Z of APC”, presented by SACAC at Liliesleaf Farm as part of the Control Conference Africa 2017, 5 December 2017 – Co-organizer and co-presenter. (CPD accredited workshop: SAIChE-334.)

Conferences

  • Symposium on Mining, Minerals and Metal Processing 2022: Co-Chair of International Programme Committee
  • Control Conference Africa 2021: Co-Chair of International Programme Committee
  • Control Conference Africa 2017: Local Organising Committee and Proceedings Editor
  • IEEE Africon2017: Technical Track Chair for Control Automation

Acted as reviewer for the following journals:

  • Canadian Journal of Chemical Engineering
  • Control Engineering Practice
  • Engineering
  • IEEE Transactions on Control Systems Technology
  • IEEE Transactions on Cybernetics
  • IEEE Transactions on Industrial Electronics
  • Industrial and Research Chemistry Research
  • International Journal of Mineral Processing
  • Journal of Process Control
  • Mathematical and Computer Modelling of Dynamical Systems
  • Minerals Engineering
  • Minerals
  • Particulate Science and Technology
  • Powder Technology

Acted as reviewer for the following conferences:

  • European Control Conference, ECC2022.
  • 14th IFAC Workshop on Intelligent Manufacturing Systems, IMS 2022.
  • 6th IFAC Workshop on Mining, Mineral and Metal Processing, MMM 2021.
  • International Mineral Processing Congress 2020/1,18-22 April 2021.
  • 59th Conference of Metallurgists, Canada, 2020.
  • 21st IFAC World Congress, Berlin, Germany, 11-17 July 2021.
  • 18th IFAC Symposium on Mining, Mineral and Metal Processing, 27-30 August 2019.
  • 5th IFAC Workshop on Mining, Mineral and Metal Processing, 23-25 August 2018.
  • 3rd IFAC Conference on Advances in Proportional-Integral-Derivative Control, 9-11 May 2018.
  • Control Conference Africa, Johannesburg, South Africa, 7-8 December 2017.
  • IEEE Africon 2017, Cape Town, South Africa, 18-20 September 2017.
  • 20th IFAC World Congress, Toulouse, France, 9-14 July 2017.
  • 3rd Conference on Control and Fault-Tolerant Systems, Barcelona, Spain, 7 – 9 Sept., 2016.
  • 17th IFAC International Symposium Control Optimisation Automation Mining Mineral Metal Processing, Vienna, Austria, 31 Aug. – 2 Sept., 2016.
  • 4th IFAC Workshop Mining Mineral Metal Industries, Oulu, Finland, Aug. 25-28, 2015.
  • IEEE International Conference on Industrial Technology, 25-27 Feb., 2013, Cape Town, South Africa.
  • IFAC Workshop on Automation in the Mining, Mineral and Metal Industries, 10-12 Sept., 2012, Nagaragawa, Gifu, Japan.

Attended as participant:

  • 20th Nordic Process Control Workshop, 25 – 26 Aug., 2016, Stockholm, Sweden.
  • 12th European Control Conference, 17 - 19 July 2013, Zurich, Switzerland.
  • 18th IFAC World Congress, 28 Aug. - 2 Sept. 2011, Milan, Italy.
  • 13th Symposium on Automation in Mining, Mineral and Metal Processing, 2-4 Aug. 2010, Cape Town, South Africa.

Visits to universities:

  • Aalto University, Prof S-L. Jamsa-Jounela, Helsinki, Finland, 8 – 18 May. 2019.
  • Technical University of Vienna, Prof. A. Kugi, Vienna, Austria, 2 Jan. – July 2019.
  • Central South University, Prof C. Yang, Changsha, China, 18 – 22 Aug 2018.
  • Aalto University, Prof S-L. Jamsa-Jounela, Helsinki, Finland, 30 Sept. – 15 Oct. 2017.
  • Norwegian University of Science and Technology, Prof. S. Skogestad, Trondheim, Norway, 1 May 2015 – 31 June 2015.
  • Koc Unviersity, Prof. Y. Arkun, Istanbul, Turkey, 28 April 2015.
  • Technical University of Vienna, Prof. A. Kugi, Vienna, Austria, 2 Jan. 2015 – 24 April 2015.
  • POSTECH, Prof. S. Won, Pohang, South Korea, 18 Sept. 2012.
  • Seoul National University, Prof. H. Shim, Seoul, South Korea, 17 Sept. 2012.

Address and Contact

Address:
Engineering Tower Building 1: Floor 13, Room 13
Main Campus, University of Pretoria
0002 Pretoria
South Africa

Contact
Email: derik.leroux(at)up.ac.za
Tel: +27 12 420-2201

Awards:

- 2019: University of Pretoria Staff Exchange Travel Abroad Programme
- 2018: Teaching and Learning Award in Dept. Electrical, Electronic and Computer Engineering
- 2015: University of Pretoria Staff Exchange Bursary Programme
- 2015: Vice-Chancellors Academic Development Grant for completion of PhD. 
- 2009: Louis van Biljon Bronze Medal for academic performance in 3rd and 4th Year. 
- 2009: Mintek prize for best student in the module “Automation” (EBT410).
- 2008: Rapid-M prize for best student in the module “Modulation Systems” (EMS310).
- 2008: Second top student in Electronic Engineering 3rd Year.
- 2007: Second top student in Electronic Engineering 2nd Year.
- 2006: Second top student in Electronic Engineering 1st Year.

Control Systems Group 2019

Control Systems Group 2014

Published by Derik le Roux

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