Browsing Research Output by Author "12064203 - Uren, Kenneth Richard"
Now showing items 1-20 of 37
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Adaptive neural network control of a helicopter system with optimal observer and actor-critic design
Hager, L. van S.; Uren, K.R.; Van Schoor, G.; Janse van Rensburg, A. (Elsevier, 2018)This paper proposes a methodology for developing an adaptive neural network controller for a simulated helicopter system. Since an indirect adaptive neural network framework is chosen, the controller comprises three ... -
Application of exergy-based fault detection in a gas-to-liquids process plant
Greyling, Sarita; Marais, Henri; Van Schoor, George; Uren, Kenneth Richard (MDPI, 2019)Fault detection and isolation (FDI) within the petrochemical industries (PCIs) is largely dominated by statistical techniques. Although a signal-based technique centered on exergy flows within a process plant was proposed, ... -
Characterisation of a PEM electrolyser using the current interrupt method
Martinson, C.A.; Van Schoor, G.; Uren, K.R.; Bessarabov, D. (Elsevier, 2014)A method is proposed to model the electrochemical characteristics of a Proton Exchange Membrane (PEM) electrolyser. The electrochemical characteristics, which include the Ohmic, activation and concentration losses, are ... -
Characterisation tools development for PEM electrolysers
Van der Merwe, Jan; Uren, Kenny; Van Schoor, George; Bessarabov, Dmitri (Elsevier, 2014)Electrochemical impedance spectroscopy (EIS), current interrupt (CI) and current mapping (CM) were investigated as in-situ characterisation tools for PEM electrolysers. A 25 cm2 cell with titanium anode and carbon cathode ... -
Comparative study of steam vs hot water as primary heat transfer medium for a laboratory scale two-tank heated system
Oberholzer, P.Z.; Uren, K.R.; Van Schoor, G.; Van Niekerk, W. (IEEE, 2019)The need exists for a benchmark multi-domain practical system that could emulate typical process faults for the purposes of condition monitoring. A proposition was made to develop a heated two-tank system, due to its ... -
Computational cost of an exergy-based fault detection scheme implemented in a commercial process simulator
Marais, Henri; Van Schoor, George; Uren, Kenneth R. (Elsevier, 2019)Energy-based fault detection and isolation (FDI) schemes show promise in terms of applicability to petrochemical industries and the broader process industries. Model-based FDI schemes offer pronounced advantages over more ... -
CREAK descriptor evaluation for visual odometry
Smulders, Dehan; Uren, Kenneth; Van Schoor, George; Van Daalen, Corné; Engelbrecht, Japie (IEEE, 2019)Each year, latest state of the art technologies and algorithms arise that claim and prove to-shine their predecessors. One such algorithm is the Colour-based Retina Key-point (CREAK) descriptor, which is based on the FAST ... -
Energy and exergy analyses of a subcritical pulverised coal-fired boiler based on the effects of slagging and fouling
Martinson, C.A.; Van Schoor, G.; Uren, K.R. (Elsevier, 2017)Globally coal-fired power plants are still predominantly utilised for production of electrical energy. The efficiency of a coal-fired power plant is greatly influenced by the performance of the boiler. In turn, the boiler ... -
An energy graph-based approach to fault diagnosis of a transcritical CO2 heat pump
Uren, Kenneth R.; Van Schoor, George; Van Eldik, Martin; De Bruin, Johannes J.A. (MDPI, 2020)The objective of this paper is to describe an energy-based approach to visualize, identify, and monitor faults that may occur in a water-to-water transcritical CO 2 heat pump system. A representation using energy attributes ... -
An energy perspective on modelling, supervision, and control of large-scale industrial systems: survey and framework
Van Schoor, George; Uren, Kenneth R.; Van Vuuren, Pieter A.; Du Rand, Carel P.; Van Wyk, Michael A. (IFAC, 2014)Energy is a universal concept that can be used across physical domains to describe complex large-scale industrial systems. This brief survey and framework gives a perspective on energy as a unifying domain for system ... -
An energy-attributed graph approach for the purposes of FDI in a heated two-tank system
Uren, Kenneth R.; Van Schoor, George; Auret, Lidia (Elsevier, 2019)The focus of this paper is the development of attributed graph representations of industrial processes. In this case energy attributes are used since it serves a data reduction purpose and allows for the consideration of ... -
An energy-based approach to condition monitoring of industrial processes
Marais, Henri-Jean; Van Schoor, George; Uren, Kenneth R. (Elsevier, 2015)Condition monitoring has traditionally been deployed for the monitoring of a single component, such as a rotating electrical machine. The application of condition monitoring to an entire process plant has not yet received ... -
Energy-based fault detection for an autothermal reformer
Marais, Henri-Jean; Van Schoor, George; Uren, Kenneth R. (Elsevier, 2016)Condition monitoring has traditionally been deployed for the monitoring of a single component, such as a rotating machine. The application of condition monitoring techniques to entire petrochemical process plants, however, ... -
Energy-based visualisation of a counter-flow heat exchanger for the purpose of fault identification
Uren, Kenneth R.; Van Schoor, George (Elsevier, 2016)The need for fault detection and diagnosis (FDD) is becoming increasingly important for industrial processes as the complexity of processes increases. A state space model of a counter-flow heat exchanger is used study to ... -
Energy-based visualisation of an axial-flow compressor system for the purposes of fault detection and diagnosis
Fouché, L.B.; Uren, K.R.; Van Schoor, G. (Elsevier, 2016)As the complexity of industrial systems increases, the necessity also increases for more reliable, robust and accurate Fault Detection and Diagnosis (FDD) techniques. This article proposes a methodology for the design of ... -
A FEM model for microwave absorption and heat transfer in a microwave combination washer dryer
Smit, Pieter; Van Schoor, George; Uren, Kenny (IEEE, 2013)Applications for the use of microwaves reach far and wide in various industries. Commonly known is the use of microwaves to heat foodstuffs. Research and development conducted in the development of a microwave combination ... -
Flight controller and low-cost test environment for a simulated helicopter
Terblanche, Martin C.; Uren, Kenneth R.; Van Schoor, George (IFAC, 2014)In this paper, optimal linear control techniques are utilised to control a radio-controlled helicopter (30 size) in the AeroSIMRC simulation environment. A grey-box time-domain system identification method is used to ... -
Genetic algorithm based PID tuning for optimal power control of a three-shaft Brayton cycle based power conversion unit
Uren, K.R.; Van Schoor, G. (Elsevier, 2012)This paper considers the development of a PID control strategy to optimally control the power output of a High Temperature Gas-cooled Reactor (HTGR) power plant. A specific type of HTGR called the Pebble Bed Modular Reactor ... -
Genetic fuzzy rule extraction for optimised sizing and control of hybrid renewable energy hydrogen systems
Human, G.; Van Schoor, G.; Uren, K.R. (Elsevier, 2020)A major challenge related to the design of a hybrid renewable energy hydrogen system is which energy sources to include and at what capacity, for regionally different potentials of renewable energy and hydrogen demand. In ... -
Graph matching as a means to energy-visualisation of a counter-flow heat exchanger for the purpose of fault diagnosis
Van Graan, S.; Van Schoor, G.; Uren, K.R. (Elsevier, 2017)Energy is a holistic way of analysing multi-domain systems. By using energy, system information can be reduced to essential or dominant dynamics. This could be advantageous for the purpose of fault diagnosis. In this paper, ...