• Automated learning rates in machine learning for dynamic mini-batch sub-sampled losses 

  Kafka, Dominic (University of Pretoria, 2020-12)

  Learning rate schedule parameters remain some of the most sensitive hyperparameters in machine learning, as well as being challenging to resolve, in particular when mini-batch subsampling is considered. Mini-batch sub-sampling ...
• Modelling and multi-objective optimisation of heat transfer characteristics and pressure drop of nanofluids in microtubes 

  Meyer, Marcel (University of Pretoria, 2020-02)

  A literature study was performed on the inner mechanisms of nanofluids and flow in microchannels. With ever changing technology, the need for smaller and more efficient devices has come about in the last couple of years. ...
• Computational investigation into jet impingement boiling on pin-fin surfaces 

  Ludick, Luwan (University of Pretoria, 2023)

  Thermal management of densely packed chips is critical for developing prevailing chips. For years, conventional air-cooling techniques have been utilised for numerous microsystems where fans and heat sinks were used in ...
• Incorporating sensor measurements using data assimilation and machine learning to improve the accuracy of thermal finite element models 

  Hellberg, Karl Gustav (University of Pretoria, 2022)

  Complex systems are commonly encountered in engineering. Such systems have a degree of unpredictability, which can lead to undesirable results. The digital twin concept has been proposed as a method to obtain more information ...
• Experimental Investigation of Factors that Influence Bevameter Terrain Characterisation 

  Kruger, Ray (University of Pretoria, 2022)

  The Bekker‐Wong soil‐wheel interaction model has been widely adopted in the terramechanics field. This model traditionally requires the soil to be characterised using a Bevameter, which entails performing in situ plate ...
• Utilizing available time-varying operating condition information in learning-based methods for fault diagnostics of rotating machinery 

  Nortje, Abel Hermanus (University of Pretoria, 2022)

  Historical failure datasets for critical assets are rarely available. This makes it difficult to integrate condition monitoring techniques found in literature into industry, as these techniques are often either equipment-specific ...
• A statistical study of the effect of manufacturing methods on the mechanical properties of high-density polyethylene/layered double hydroxide composites 

  Botha, Natasha (University of Pretoria, 2023)

  Polymer-clay composites have applications in numerous sectors such as packaging, automotive manufacturing and agriculture. A primary focus of polymer composite research is to improve the performance of these composites ...
• Surface temperature uniformity for single-phase developing laminar flow through horizontal tubes submerged in boiling water 

  Munzara, Rudaviro (University of Pretoria, 2022)

  An experimental study was done to investigate the heat transfer characteristics of simultaneously hydrodynamically and thermally developing laminar flow of water through a horizontal tube, which was submerged in boiling ...
• Tyre Force Prediction from Deformation Measurements 

  Gast, Robin Grant (University of Pretoria, 2022)

  Tyre forces are the primary external forces applied to a vehicle, especially at lower speeds, but are notoriously difficult to measure or predict. An intelligent tyre that allows the external forces to be determined from ...
• Air-cooled window for a recuperated solar-dish Brayton cycle using a turbocharger and short-term thermal storage 

  De Beer, Jan Hendrik (University of Pretoria, 2022)

  A recuperated solar-dish Brayton cycle using an off-the-shelf turbocharger as a micro-turbine and a rectangular cavity receiver with integrated thermal storage was considered for this study. Due to the high temperatures ...
• Experimental investigation of the impact of non-uniform heat flux on boiling in a horizontal circular test section 

  Scheepers, Hannalie (University of Pretoria, 2021)

  Presented here are the results from the steady state flow boiling of R245FA in a laboratory scale horizontal stainless-steel test tube with an inner diameter of 8.5 mm and a length of 900 mm at a saturation temperature of ...
• Optimization Of Wind Barriers For The Minimization Of Mirror Soiling In A Parabolic Trough Collector Plant 

  Otukpa, Godswill (University of Pretoria, 2021)

  Concentrated Solar Power (CSP) also known as concentrated solar thermal is the systematic act of using mirrors and lenses to concentrate direct sunlight to a specific focal point so that solar radiation can be converted ...
• Articulated vehicle stability control using brake-based torque vectoring 

  Catterick, Jamie (University of Pretoria, 2021)

  Statistics show that unstable articulated vehicles pose a serious threat to the occupants driving them as well as the occupants of the vehicles around them. An articulated vehicle typically experiences three types of ...
• Achieving controllable continuous variable damping within a semi-active hydro-pneumatic suspension system 

  De Wet, Benjamin (University of Pretoria, 2020)

  The compromise between ride comfort and handling for a passive suspension system is a well-known and often researched problem. Semi-active suspension systems offer significant improvements to this compromise. One example ...
• Thermal Performance of an Air Channel with Cylindrical Cross-bars 

  Coetzee, Frans Jozef Jacobus (University of Pretoria, 2021)

  Heat exchangers are used in a wide variety of industrial applications. Augmentation of heat transfer can realize a reduction in heat transfer size and increase the effectiveness and efficiency of heat exchangers. Heat ...
• Impact of coal quality on equipment lifetime at coal-fired power stations 

  Van der Westhuizen, Bernard Cornelius (University of Pretoria, 2019)

  With the export of coal being more lucrative than selling coal to South African power producers, power station operators might consider accepting lower-quality coal. While the impact lower quality coal has on cycle efficiency ...
• Numerical investigation on the effect of gravitational orientation on bubble growth during flow boiling in a high aspect ratio microchannel 

  Potgieter, Jarryd (University of Pretoria, 2019)

  Recent technological developments, mostly in the fields of concentrated solar power and microelectronics, have driven heat transfer requirements higher than current heat exchangers are capable of producing. Processing power ...
• Investigation of damage detection methods for laminated composite materials using full field digital image correlation 

  Qambela, Crown James (University of Pretoria, 2020)

  The aeronautical industry is among many which have focused on material with a high strength to weight ratios in order to accomplish as much efficiency as possible during flight. Among material of high strength to weight ...
• Predicting stage performance of a multi-stage centrifugal compressor using the overall compressor performance characteristic 

  Human, Dirk Cornelius (University of Pretoria, 2019)

  The reliable operation of Integrally Geared Centrifugal Compressors (IGCCs), used in the coal-fired power generation industry of South Africa, is essential for economic, environmental and safety considerations. However, ...
• Dynamic investigation of vibratory screen response in a FEM environment 

  Harat, Robert Oliver (University of Pretoria, 2020)

  Effective models of vibratory screens which can capture the true response characteristics are crucial in the understanding of faults and failures which occur in vibratory screens. However, the current available models are ...

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