Browsing Conference Papers - Potchefstroom Campus by Author "10732926 - Van Vuuren, Pieter Andries"
Now showing items 1-16 of 16
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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 ... -
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 ... -
Automatic infarct planimetry by means of swarm-based clustering
Van Vuuren, Pieter A.; Van Vuuren, Derick (PRASA, 2014)Infarct planimetry is an important tool in cardiology research. At present this technique entails that infarct size is manually determined from scanned images of prepared heart sections. Existing attempts at automating ... -
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 ... -
The characterization of the severity of rotor delevitation events: a parametric study
Janse van Rensburg, Jan J.; Van Schoor, George; Van Vuuren, Pieter A. (s.n, 2012)Active magnetic bearing (AMB) failure and the ensuing rotor behavior is a very important aspect of AMB safety. A model for this rotor behavior was developed and was used to characterize the severity of rotor delevitation ... -
Condition monitoring thermal properties of a 20A hydraulic-magnetic MCB
Kleynhans, R.; Van Vuuren, P.A.; Thomas, R.A. (NWU, 2018)Heat is one of the major causes of degradation which can cause a reduction in performance, reliability and life span of miniature circuit breakers (MCBs) [1]. In order to diagnose the condition of electrical equipment, ... -
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 ... -
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 ... -
Low-cost monitoring of partial discharge activity by means of Sub-Nyquist sampling
Van Vuuren, P.A. (British Institute of Non-Destructive Testing, 2014)The relatively low cost of distribution transformers dictates that the cost of any condition monitoring system for such transformers should be as low as possible. Premature failure of any transformer in an electrical grid ... -
Monitoring gearbox oil viscosity by means of motor current signal analysis
Van Vuuren, Pieter A.; Xu, Yuandong; Gu, Fengshou; Ball, Andrew D. (Univ of Huddersfield, 2017)A number of gearbox failures can be attributed to lubricant related problems. One measure of the condition of gearbox oil is its viscosity. In electrically powered systems, motor current signal analysis allows online ... -
Multivariable H∞ control for an active magnetic bearing flywheel system
Steyn, S.J.M.; Van Vuuren, P.A.; Van Schoor, G. (IET, 2010)A state-space model with uncertainties for an active magnetic bearing energy storage flywheel system (Fly-UPS) is developed. A multivariable robust H∞ controller for the Fly-UPS is then synthesised. Different weighting ... -
Off Line Partial Discharge as an essential Condition Based Monitoring (CBM) Tool for busbar insulation monitoring on Air Insulated Switchgear (AIS)
Bissett, J.V.; Van Vuuren, P.A. (NWU, 2018)This paper investigates the effectiveness of current test methods and procedures associated with insulation testing on the busbar of Air Insulated Switchgear (AIS) during scheduled planned maintenance. An improved test ... -
Pseudo-magnetic centre identification of an active magnetic bearing for sensorless drive control start-up
Kruger, Gert L.; Van Schoor, George; Van Vuuren, Pieter A. (Elsevier, 2017)A method of identifying runout of an active magnetic bearing at standstill and low speed is presented. The on-line current bias injection method found in literature is improved, but is still found to converge too slowly ... -
A survey on reducing reconfiguration cost: reconfigurable PID control as a special case
Le Roux, Rikus R.; Van Schoor, George; Van Vuuren, Pieter A. (IFAC, 2014)Reconfigurable computing is a paradigm in computing architecture that refers to the practice of using interchangeable hardware modules to enhance the performance of conventional Von-Neumann style computing. Despite the ... -
Using visual texture analysis to classify raw coal components
Van Vuuren, Pieter A.; Le Roux, M.; Venter, W.C.; Campbell, Q.P.; Dorland, H.C. (IEEE, 2015)Coal ore isn’t a uniform material. In order to optimize the coal liberation process it is necessary to classify a coal ore sample into its constituent components as quickly and cheaply possible. This paper investigates ... -
Variance-based sensitivity of localized sulphation to microporous separator properties using a distributed parameter model of a valve-regulated lead-acid battery
Janse van Rensburg, Angelique; Van Schoor, George; Van Vuuren, Pieter Andries (Electrochemical Society, 2016)Progressive sulphation of the negative electrode in a lead-acid battery under high-rate operation remains a serious problem. This study investigates how healthier end-of-discharge conditions, in a valve-regulated lead-acid ...