Research Articles (Industrial Engineering)
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Browsing Research Articles (Industrial Engineering) by browse.metadata.type "Conference Paper"
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- ItemCorrelation and causation : a potential pitfall for efficient asset management(South African Institute for Industrial Engineering, 2014) Heyns, Johannes Hendrik; Vlok, P. J.ENGLISH ABSTRACT: The successful coordination of activities and practices within a system rely on the organisation’s ability to make informed decisions. Decisions must be made quickly and effectively, while ensuring efficient Physical Asset Management (PAM). Access to processed data, in the form of reliable information, on how sub systems interact greatly simplifies decision-making. Many organisations mistake correlation for causation when analysing this data. Such a mistake carries great consequences for organisations, since important decisions might unknowingly be based on self-invented problems, while the true problem is left unresolved. It is crucial to understand the difference between correlation and causation when practising root cause analysis within a PAM environment. Although root cause analysisis presumed a highly specialised field, organisations can equip themselves to better understand how different events within a PAM system are interconnected. If done correctly this might simplify the process of detecting problems, which might exist within a system.This paper highlights the differences between correlation and causation. Potential pitfalls on how correlation can be mistaken for causation within a PAM environment are identify and explained. Recommendations are made on how to avoid these pitfalls.
- ItemA decision support system framework for machine selection(South African Institute for Industrial Engineering, 2014) Nyanga, Lungile; Van der Merwe, Andre Francois; Matope, Stephen; Dewa, Mncedisi TrinityENGLISH ABSTRACT: Selecting the right machinery to machine a part is a multi criteria decision making problem which is crucial in production planning. The process becomes more complex and tedious when one has to choose from a variety of machines available in an online registry. This paper investigates this decision making process with the objective to increase machineutilisation for small, medium and micro enterprises. A real time information based decision support system is necessary to assist the decision maker. A decision support system framework for machine selection for a manufacturing agent is proposed based on the Analytical Hierarchy Process (AHP). A human expect uploads parameters for a part that has to be machines. Based on these parameters, suitable machines are sought for from an online machine registry and ranked according to their capability to produce the desired part.
- ItemInvestigating the sustainability and feasibility of different disposable cups : a coffee shop perspective(South African Institute for Industrial Engineering, 2018) Vermeulen, Carla; Bam, Wouter GideonENGLISH ABSTRACT: With convenience being a sought-after factor in today's society, disposable coffee cups play a significant role in many people's daily routines. There still, however, appears to be a general confusion in many coffee shop environments regarding optimal waste treatment of disposable coffee cups to minimise their environmental impact. This study thus compares the different disposable coffee cup options that are available to South African coffee shops to determine which options (in terms of different materials) are more environmentally friendly under different conditions, whilst also satisfactorily meeting the requirements of coffee shops and customers.
- ItemA methodology to evaluate the influence of part geometry on residual stresses in selective laser melting(Faculty of Engineering, Department of Industrial Engineering, Stellenbosch University, 2016) Mugwagwa, L.; Dimitrov, D.; Matope, S.; Becker, T. H.ENGLISH ABSTRACT: The subject of residual stresses induced by the Selective Laser Melting (SLM) process has been one of the main focus areas in literature over the past decade. It has been reported that residual stresses can be responsible for shape and dimensional distortions, cracking and compromised mechanical properties (reduced yield and fatigue strength). These shortfalls limit the applicability of SLM components in industry, particularly for the aerospace industry where part lifetime and hence fatigue life is of utmost concern. High temperature gradients have been reported to be responsible for the residual stress build up. A key aspect that has not been considered in literature is part geometry and orientation and its influence on residual stress levels. Thus, this study proposes a methodology for investigating this influence for different geometric features. In this work, samples were built from tool steel powders. The Hole Drilling Method (HDM) and X-Ray Diffraction (XRD) techniques are proposed for measuring residual stresses. Preliminary results show that the geometry of a part influences residual stress magnitudes and distributions, with sharper ends exhibiting higher stresses than less sharp specimen ends.