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Theses and Dissertations (Mechanical and Aeronautical Engineering): Recent submissions
Now showing items 61-80 of 380
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(University of Pretoria, 2020)This dissertation presents an approach to use blade tip timing measurements with finite element analysis to predict the fatigue life of a low pressure steam turbine last stage blade under high backpressure and low flow ...
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(University of Pretoria, 2019)The classical test to confirm the performance of a given fibre design for use in reinforced concrete is the pull-out test. While attempts have been made to simulate the performance of such pull-out tests, in practice it ...
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(University of Pretoria, 2020)Structural shape optimisation is a field that has been studied since early on in the development of finite element methods. The sub-fields of shape and topology optimisation are continuously growing in industry and aim to ...
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(University of Pretoria, 2019)South Africa is plagued by rolling blackouts, and many citizens do not have access to electricity or clean water. A personalised micro-turbine power generation system presents a solution to this issue and may become as ...
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(University of Pretoria, 2019)Due to the recognition of the importance of maintenance from an organisational perspective, a number of different maintenance-related approaches have been developed. These approaches include reliability centred maintenance, ...
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(University of Pretoria, 2019)Sub-Saharan Africa has an underutilised solar resource that is available to provide distributed-scale power to rural communities that are not reached by the current grid systems that are in place. Renewable power generation ...
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(University of Pretoria, 2020)In this experimental and numerical investigation, the use of flow turbulation was considered as a method to increase local heat transfer coefficients in annular heat transfer passages. Experimental data was obtained for ...
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Experimental investigation of free-surface jet-impingement cooling by means of TiO2-water nanofluids (University of Pretoria, 2019)The exponential advancements in the field of electronics and power generation have resulted in increased pressure on the thermal management of these systems where the desire for enhanced heat transfer is prevalent. A ...
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A deep learning approach towards diagnostics of bearings operating under non-stationary conditions (University of Pretoria, 2019)Faults in bearings usually manifest as marginal defects that intensify over time, allowing for well-informed preventative actions with early Fault Detection and Diagnosis (FDD) protocols. Detection of the fault begins with ...
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(University of Pretoria, 2019-11-01)Condition-based maintenance is an important aspect in various industries to ensure reliable operation of machinery. To successfully execute maintenance responsibilities, it is required to know which components are healthy ...
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(University of Pretoria, 2019)This dissertation proposes hybrid models for (i) diagnosis and (ii) remaining useful life estimation of a single fatigue crack in a low-pressure turbine blade. The proposed hybrid methods consist of physics-based methods ...
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(University of Pretoria, 2018)The tyre contact patch is important to vehicle dynamics analysis since this is where the tyre-road interaction forces originate. If the contact patch mechanism is understood in depth and can be simulated accurately, it ...
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(University of Pretoria, 2019)Turbine stages are exposed to a variety of excitation sources in the power industry. The resulting forced vibration excitation of the blades may occur near a blade’s natural frequency. Blade vibration is an inevitable, ...
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(University of Pretoria, 2019)A well-known challenge in vehicle dynamics is to design a vehicle that will not only keep the occupants comfortable, but will also ensure safe and stable operation during various manoeuvres over multiple driving surfaces. ...
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(University of Pretoria, 2019)Large commercial aircraft by design typically are not capable of transporting maximum fuel capacity and maximum payload simultaneously. Maximum payload range remains less than maximum range. When an aircraft is operated ...
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(University of Pretoria, 2018)Turbine blades are subjected to various damage mechanisms with fatigue as the primary contributor. During operation, damage accumulates in the form of crack initiation and propagation. This may lead to catastrophic failure, ...
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(University of Pretoria, 2018)The design challenges of micro gas turbines, compared to large gas turbines, lies in the size of Athe components. Firstly, the small components cannot achieve a high-pressure ratio which cause the mass flow rate to be ...
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(University of Pretoria, 2019)The forces generated in the tyre contact-patch are important for vehicle dynamics analysis. The tyre contact patch is not directly visible due to the terrain. Measuring the strain in the contact patch region may give insight ...
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Heat transfer augmentation in a rectangular channel by the use of porous sinusoidal screen inserts. (University of Pretoria, 2019)Most regions in Southern Africa, South Africa in particular receives an abundancy of solar energy when compared to other regions across the globe. The most economical way to harness this energy is to design and implement ...
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(University of Pretoria, 2018)Sport Utility Vehicle (SUV) sales are increasing globally, even surpassing sedan vehicle sales worldwide. Their increasing popularity is termed a continuous trend that is expected to last. SUVs are known to offer a higher ...
Now showing items 61-80 of 380