Browsing Faculty of Engineering by Author "12134457 - Van Schoor, George"
Now showing items 1-20 of 82
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Action evolution for intelligent agents
Neser, Morné; Tessendorf, Rodney E.; Van Schoor, George (IEEE, 2005)This paper introduces an alternative method of reinforcement learning for intelligent agents. The aim with this method is to closer emulate the natural thought processes of problem solving. This paper only provides a ... -
Active surface area approximation in a lead-acid cell for optimal performance in renewable energy systems
Janse van Rensburg, Angelique; Van Schoor, George; Van Vuuren, Pieter A. (IFAC, 2014)In a renewable energy system, lead-acid batteries are required to last as long as possible whilst providing deep discharges and are usually charged in an intermittent manner. This type of operation is severely detrimental ... -
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 ... -
Alcohol and the oculomotor neural circuit: system identification, a delay-based approach
Du Plessis, Willem; Van Vuuren, Pieter; Van Schoor, George (IEEE, 2015)A fair amount of research has been done on the modeling of the oculomotor system. Models of the oculomotor neural circuitry that include the effect of alcohol are less plentiful in literature. We investigated the ... -
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, ... -
Block RAM implementation of a reconfigurable real-time PID controller
Le Roux, Rikus; Van Schoor, George; Van Vuuren, Pieter (IEEE, 2012)Despite the numerous advantages reconfigurable computing adds to a system, it is only advantageous if the execution time exceeds the configuration time. As a result of the long configuration time, reconfiguration is only ... -
Block RAM-based architecture for real-time reconfiguration using Xilinx® FPGAs
Le Roux, Rikus; Van Schoor, George; Van Vuuren, Pieter (South African Institute of Computer Scientists and Information Technologists, 2015)Despite the advantages dynamic reconfiguration adds to a system, it only improves system performance if the execution time exceeds the configuration time. As a result, dynamic reconfiguration is only capable of improving ... -
Cathodic protection system design framework
Diedericks, Dewald E.; Van Schoor, George; Ranft, Eugén O. (IEEE, 2019)The aim of this article is to establish a cathodic protection (CP) system design framework for the petrochemical industry in South Africa. The CP system design framework is destined to be used as a guideline when designing ... -
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 ... -
A comparative study on fault detection and correction techniques on active magnetic bearing systems
Gouws, Rupert; Van Schoor, George (IEEE-Institute of Electrical and Electronics Engineers, 2007)In this paper, the authors distinguish between three real-time fault detection, correction and identification schemes for vibration forces on the rotor of a rotational active magnetic bearing (AMB) system. Historical fault ... -
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 ... -
Control of magnetically suspended rotor combined with motor drive system
Kruger, Gert L.; Van Schoor, George; Van Vuuren, Pieter A. (IFAC, 2014)This paper presents the cooperative control between the active magnetic bearing system and the permanent magnet synchronous drive. More specifically, the coupling between the vibration control and sensorless drive control ... -
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 ... -
A current analysis and correction system for vibration forces on the rotor of a rotating active magnetic bearing system
Gouws, R.; Van Schoor, G. (SAIEE, 2007)In this paper, an on-line detection, correction and identification system for vibration forces on the rotor of a rotating active magnetic bearing is proposed. The on-line detection system performs current analysis by ... -
Data acquisition system for capturing dynamic transients in a control valve
Helling, Arnold; Van Schoor, George; Helberg, Albert S.J. (IEEE, 2004)This work presents the development of a data acquisition (DAQ) system to be used in conjunction with fuzzy modelling to derive a dynamic mathematical model of a control valve. Characterising the behaviour of a control valve ... -
Design and optimisation of a PCB eddy current displacement sensor
Grobler, A.J.; Van Schoor, G.; Ranft, E.O. (SAIEE, 2017)Position sensing is one of the crucial parts of many systems, specifically in an active magnetic bearing. The position is used to control the magnetic forces within an active magnetic bearing to keep a rotor levitated. ... -
The development of a flexible rotor active magnetic bearing system
Ranft, E.O.; Van Schoor, G.; Roberts, J.G. (SAIEEE, 2007)A design process comprising aspects of modelling and analysis is developed, implemented and verified for a flexible rotor active magnetic bearing system. The system is specified to experience the first three critical ... -
The development process of an axial active magnetic bearing
Gouws, R.; Van Schoor, G. (2005)The purpose of this paper is to motivate and inspire students to investigate and understand fundamental principles of electrical engineering such as magnetic levitation, control theory and sensor design. This paper describes ...