Browsing by Author "Maradzano, Isabellah"

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    Application of lean principles in the South African construction industry
    (Stellenbosch : Stellenbosch University, 2021-03) Maradzano, Isabellah; Matope, Stephen; Stellenbosch University. Faculty of Engineering. Dept. of Industrial Engineering.
    ENGLISH ABSTRACT: South Africa is a developing country that invests billions of rands annually in the construction industry. This industry consumes resources, and inevitably, waste is generated during the process. Although numerous approaches have been developed to improve quality, efficiency, and effectiveness in this industry, lean principles offer the ability to minimise and eliminate non-value adding work thus increasing value for the client. The research was carried out in three stages which are literature review, lean construction framework development and lean construction framework validation and verification through case studies. In the literature review section the thesis discussed concepts of lean, lean thinking principles, lean production methods to reduce waste, lean construction, benefits of lean construction, lean construction tools currently used worldwide, barriers to lean construction, drivers of lean construction practice in the South African construction industry, waste classification in this industry and controllable waste in construction. The research study then used the systematic literature review methodology to systematically analyze applications of lean principles in the construction industry, and identified tools that will be used to be implement lean construction in the South African construction industry (electrical and mechanical engineering services). The results of the systematic literature were used to develop a lean construction implementation framework. The framework was then implemented and refined using two local case studies focusing on electrical and mechanical engineering services in the South African construction industry. The refined lean implementation framework is made out of four segments which are focusing on culture and behaviour, implementing lean construction practices, lean construction drivers, and using lean project management strategies.
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    Application of lean principles in the South African construction industry
    (Southern African Institute for Industrial Engineering, 2019-11) Maradzano, Isabellah; Dondofema, Richmore Aron; Matope, Stephen
    ENGLISH ABSTRACT: South Africa is a developing country that invests billions of rands annually in the construction industry. This industry consumes resources and, inevitably, waste is generated during the process. Although numerous approaches have been developed to improve quality, efficiency, and effectiveness in this industry, lean principles offer the ability to minimise and/or eliminate non-value adding work, thus increasing value for the client. This paper highlights the lean construction tools currently used worldwide, and the benefits of adopting lean construction. The study surveyed publications on the application of lean principles in the construction industry, and identified tools yet to be implemented in the South African construction industry with specific reference to electrical and mechanical engineering services. The study used a systematic review methodology to identify different lean construction concepts, and developed a lean implementation framework. The framework was then evaluated using a local case focusing on electrical and mechanical engineering services in the construction industry. The improved framework after evaluation consists of eight steps.
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    Design of cotton ginning dryer control system
    (South African Institute for Industrial Engineering, 2014) Maradzano, Isabellah; Nyanga, Lungile; Van der Merwe, Andre Francois; Dlodlo, Zwelibanzi B.; Chikowore, Takawira R.; Mhlanga, Samson
    ENGLISH ABSTRACT: The most important factor in preserving the quality of cotton during ginning is the fibre moisture content. At higher moisture content, cotton fibres are stronger but trash is harder to remove. Selecting ginning moisture content is a compromise between good trash removal and quality preservation. In the paper, inlet and outlet moisture content of cotton being fed into and out of the dryer are monitored at temperatures given in the dryer manual and literature. A mathematical model for drying cotton is then formulated by analysing the experimental results, cotton dryer historical records and dryer manual. The results show that there is a linear relationship between the initial moisture content, final moisture content and drying temperature. A control system integrating a Barionet controller to regulate and supply of heat to the system based on the initial moisture content is then proposed. The objective of the control system is to enable online monitoring of the dryer as well as giving early warning signs when the system is about to get out of control hencesafeguarding from overheating and avoid under-drying of cotton.