Browsing Faculty of Engineering by Author "11790199 - Du Rand, Carel Petrus"
Now showing items 1-14 of 14
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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 ... -
Enthalpy-entropy graph approach for the classification of faults in the main power system of a closed Brayton cycle HTGR
Du Rand, C.P.; Van Schoor, G.; Nieuwoudt, C. (Elsevier, 2009)An enthalpy–entropy (h–s) graph approach for the classification of faults in a new generation type high temperature gas-cooled reactor (HTGR) is presented. The study is performed on a 165 MW model of the main power system ... -
Evaluation of demodulation algorithms for robust self-sensing active magnetic bearings
Van Schoor, G.; Niemann, A.C.; Du Rand, C.P. (Elsevier, 2013)Active magnetic bearings (AMBs) play a key role in various industrial applications. In the ongoing challenge to reduce the number of external sensing devices and manufacturing costs of AMBs, self-sensing techniques have ... -
Fault diagnosis of generation IV nuclear HTGR components. Part 1. The error enthalpy-entropy graph approach
Du Rand, C.P.; Van Schoor, G. (Elsevier, 2012)Fault diagnosis (FD) is an important element in modern nuclear power plant (NPP) diagnostic systems. In this respect, FD of generation II and III water-cooled nuclear energy systems has become an active research topic to ... -
Fault diagnosis of generation IV nuclear HTGR components. Part 2. The area error enthalpy-entropy graph approach
Du Rand, C.P.; Van Schoor, G. (Elsevier, 2012)The second paper in a two part series presents the area error method for generation of representative enthalpy–entropy (h–s) fault signatures to classify malfunctions in generation IV nuclear high temperature gas-cooled ... -
Frequency dependent impedance model for heteropolar magnetic bearings
Ranft, E.O.; Van Schoor, G.; Du Rand, C.P. (Elsevier, 2015)Accurate analytical models are fundamental to design and optimise high performance magnetic bearings. Understanding the bearing’s dynamic behaviour over its operational envelope is essential to this task and is performed ... -
Fuzzy logic controller with neurol network signal predictors for complex split-range control of a hybrid actuator
Van Schoor, G.; Breed, D.G.; Du Rand, C.P. (Elsevier, 2013)This paper presents an integrated fuzzy logic controller (FLC) to address challenges associated with complex split-range control of a two-valves-in-parallel hybrid actuator. Split-range hybrid valve (HV) control aims to ... -
An integrated approach to sensor FDI and signal reconstruction in HTGRs. Part I. Theoretical framework
Uren, Kenneth R.; Van Schoor, George; Du Rand, Carel P.; Botha, Anrika (Elsevier, 2016)Sensor fault detection and isolation (FDI) is an important element in modern nuclear power plant (NPP) diagnostic systems. In this respect, sensor FDI of generation II and III water-cooled nuclear energy systems has become ... -
An integrated approach to sensor FDI and signal reconstruction in HTGRs. Part II. Case studies
Uren, Kenneth R.; Van Schoor, George; Du Rand, Carel P.; Botha, Anrika (Elsevier, 2016)This second paper in a two part series presents the application and validation of an integrated approach for sensor fault detection and isolation (FDI) in high temperature gas-cooled reactors (HTGRs) in the form of two ... -
Integrated procedure for vibration characterization of a magnetic bearing supported rotor delevitation system
Bean, J.; Van Schoor, G.; Du Rand, C.P. (Elsevier, 2016)This paper considers an integrated procedure to verify and validate (V&V) the rotordynamic analyses of a magnetic bearing supported rotor delevitation system (RDS). Rotor-AMB (active magnetic bearing) systems in general ... -
An integrated self-sensing approach for active magnetic bearings
Ranft, E.O.; Van Schoor, G.; Du Rand, C.P. (IEEE, 2011)Self-sensing permits active magnetic bearings (AMBs) to consolidate the actuation and sensing functions into a single electromagnetic transducer. Eliminating the position sensing device as well as interfacing reduce potential ... -
A self-sensing active magnetic bearing based on a direct current measurement approach
Niemann, Andries C.; Van Schoor, George; Du Rand, Carel P. (MDPI, 2013)Active magnetic bearings (AMBs) have become a key technology in various industrial applications. Self-sensing AMBs provide an integrated sensorless solution for position estimation, consolidating the sensing and actuating ... -
Self-sensing for electromagnetic actuators. Part 1. A coupled reluctance network model approach
Ranft, E.O.; Van Schoor, G.; Du Rand, C.P. (Elsevier, 2011)A self-sensing arrangement in active magnetic bearings (AMBs) comprises a single electromagnetic transducer to realize the actuation and sensing functions concurrently. Minimizing the number of sensing devices and associated ... -
Self-sensing for electromagnetic actuators. Part 2. Position estimation
Ranft, E.O.; Van Schoor, G.; Du Rand, C.P. (Elsevier, 2011)The second paper in a two part series presents the position estimation scheme for an 8-pole heteropolar active magnetic bearing (AMB). The integrated self-sensing assembly comprises a nonlinear MIMO parameter estimator ...