Department of Industrial Engineering
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Browsing Department of Industrial Engineering by browse.metadata.type "Proceedings International"
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- ItemDevelopment and implementation of a telerobotic system with visual and haptic feedback : current progress(Industrial Engineering, Stellenbosch University, 2011-09) Pretorius, J.; Van der Merwe, Andre F.Telerobotics is a field of robotics interested in controlling robots from a distance. Incorporating visual and haptic (touch) feedback allows the operator greater accuracy in manipulating objects in a remote environment. This project endeavours to develop a telerobotic system with a focus towards telesurgical applications by using two similar industrial robotic manipulators, one acting as a haptic input device, the other as the telerobot. This paper describes the process of converting such robots into a functioning telerobotic system that allows the operator to “see” and “feel” in the remote environment. A partial working model of the telerobotic system can be achieved through experimental procedures.
- ItemThe development of experimental machines in order to understand the demands of incremental sheet forming of titanium(Industrial Engineering, Stellenbosch University, 2011-09) Oosthuizen, G. A.; Nortje, H.; Herselman, E. J.; Akdogan, G.; Sacks, N.Titanium sheet-metal is extensively used for aerospace and biomedical applications. The diversified customer's demands have created a recent trend towards the small batch production. In this context incremental forming has attained great attention. Therefore, experimental machines are designed and manufactured to simulate the harsh forming conditions. In the fretting machine the combination of a normal force and small vibrations may constitute a wear phenomenon known as fretting wear. The friction and wear properties of the tool, lubrication and work piece materials are tested using the sliding test machine. The steps to evaluate and develop these machines as research tools are illustrated and discussed. The fretting- and sliding machines help to investigate suitable forming tools, forming parameters and lubricant strategies for incremental forming of titanium. It is concluded that these simulation tools provide more efficient and cost effective ways to understand the effects of changing the forming conditions.
- ItemDevelopments in wear maps as machining optimisation tools(Industrial Engineering, Stellenbosch University, 2011-09) Oosthuizen, G. A.Tool wear maps can be a diagnostic instrument for failure analysis. This paper presents a summary of the recent developments of wear maps and experimental results from the milling of a Ti6Al4V benchmark component. This forms the foundation of understanding the cutting demands on the tools, in order to analyze the main wear mechanisms. Remedial actions are integrated via this understanding of the failure modes and related mechanisms. These maps present wear data in a graphical manner and are able to provide a more global picture of how materials behave during cutting. In tool wear maps there is a region where the rate of wear is at its lowest, called the safe zone. The presence of this safe zone suggests that it may be possible to select the machining parameters so that a machinist can operate with the lowest amount of tool wear, without compromising the level of productivity desired. Some thoughts on future directions for research in this area are also discussed.
- ItemE-manufacturing - the roadmap for South African manufacturers(Stellenbosch : Stellenbosch University, Department of Industrial Engineering, 2011-09) Nyanga, L.; Van der Merwe, A. F.Globalization and the internet have given customers a wide choice of products to choose from and they are now expecting a lot from products. Customers are demanding more value, less risk and better integration of products hence products now have a shorter product life cycle. E-manufacturing can help companies to optimize the use of production assets, reduce production cycle times and costs to meet these customer requirements. The paper shows factors that influenced an economy to successfully implement an emanufacturing model that transformed the economy from a struggling economy into an advanced economy. E-manufacturing models are discussed. Taiwan is used as a case study of how engineering chain can be utilized for SMEs to enjoy equally or even higher competitive advantage than their larger competitors by appropriately utilizing external networks. The situation in South Africa shows that the country can benefit from the growth of SMEs and e-manufacturing if networks and a culture of sharing information are built among SMEs and companies in the country.
- ItemEconomic requirements analysis for table grape check weighing(Industrial Engineering, Stellenbosch University, 2011-09) Smit, R.; Treurnicht, N. F.; Blanckenberg, M. M.South Africa’s table grape industry exports most of its production to the developed world where customer satisfaction is very important and strictly regulated. Severe penalties are levied for underweight packaged products and contracts could even be lost. This study aims to determine the feasibility of automated check weighing of final product prior to shipping. The frequency of occurrence of underweight packages is investigated by means of structured interviews conducted within the industry. The probable financial impact of underweight packing is estimated and the paper concludes with a presentation of the capital amount producers can spend to eliminate underweight packaging profitably.
- ItemFood system analysis : an assessment of food availability and accessibility(Industrial Engineering, Stellenbosch University, 2011-09) Roos, J. A.; Ruthven, G.The food system refers to the chain of activities connecting food production to consumption. Studies on the impact of the globalization of the food system have become increasingly important in the context of food security and highlights that food availability and access are not only a matter of agricultural production, but requires attention to the entire food value chain. This research initiative will investigate the food system and determine its contribution to the food security status of the community of Avian Park, situated in the Breede Valley in the Western Cape Province of South Africa.
- ItemInternational conference on competitive manufacturing (COMA 16) proceedings(Stellenbosch University, 2016-01) Dimitrov, Dimiter; Oosthuizen, TiaanWelcome to this sixth in South Africa International Conference on Competitive Manufacturing hosted by the University of Stellenbosch and organised by the Department of Industrial Engineering. The main objective of COMA '16, the International Conference on Competitive Manufacturing is to present recent developments, research results and industrial experience accelerating improvement of competitiveness in the field of manufacturing. The 90 papers and presentations invited or selected to be delivered at the Conference, deal with wide aspects related to product design and realisation, production technologies and systems, operations management as well as enterprise design and integration. The worldwide participation and range of topics covered indicate that the Conference is truly a significant meeting of people striving similar aims. The event is an additional opportunity for communication between paper authors and attendees, which undoubtedly will serve as a further step towards exciting developments in the future. It also provides ample opportunities to further exploit international collaboration.
- ItemInternational Conference on Competitive Manufacturing (COMA 19) Proceedings(Stellenbosch University, 2019-02) Dimitrov, Dimiter; Hagedorn-Hansen, Devon; Von Leipzig, Konrad; Faculty of Engineering; Department of Industrial Engineering; Stellenbosch UniversityENGLISH ABSTRACT: Welcome to this seventh International Conference on Competitive Manufacturing hosted by the University of Stellenbosch and organised by the Department of Industrial Engineering. The main objective of COMA ’19, the International Conference on Competitive Manufacturing is to present recent developments, research results and industrial experience accelerating improvement of competitiveness in the field of manufacturing. The 90 papers and presentations invited or selected to be delivered at the Conference, deal with wide aspects related to product design and realisation, production technologies and systems, operations management as well as enterprise design and integration. The worldwide participation and range of topics covered indicate that the Conference is truly a significant meeting of people striving similar aims. The event is an additional opportunity for communication between paper authors and attendees, which undoubtedly will serve as a further step towards exciting developments in the future. It also provides ample opportunities to further exploit international collaboration.
- ItemInvestigating momentum on the Johannesburg Stock Exchange(Industrial Engineering, Stellenbosch University, 2011-09) Snyman, Hendrik A.; Von Leipzig, KonradThe paper examines if stock price momentum is a common trait amongst top performing shares on the Johannesburg Stock Exchange and whether individual investors can harness the relationship of momentum and return to create a profit. The viability of the phenomenon as an investment strategy was gauged by comparing annualised average returns of momentum shares, identified through both technical analysis as well as price performance momentum measures, against the market capitalisation weighted JSE All Share Index as well as against an un-weighted representation of the market. The results revealed a seemingly unmistakable co-dependence between momentum and return, with statistically significant trends being ever present. Applying the maximum taxes and trading costs revealed that the highest ranked momentum shares did indeed outperform both market benchmarks from the period of January 1990 to August 2009, suggesting the validity of the philosophy as an investment strategy.
- ItemA systems engineering approach to telemedicine system implementation in South Africa(Industrial Engineering, Stellenbosch University, 2011-09) Van Dyk, L.; Schutte, C. S. L.; Fortuin-Abrahams, J.The South African National Department of Health (DoH) is recognizing, for more than a decade already, the potential benefit of information and communication technology (ICT) to deliver healthcare to rural areas. However, despite generous funding and proven technology, not many of telemedicine systems sustained after pilot phase. The purpose of this paper is to develop a maturity model that can be used to measure and manage the capability of a health system to sustain health care delivery after the pilot phase of a telemedicine project. Four existing frameworks are used as input to this maturity model, namely the ISO 15288 Systems Engineering Life Cycle Standards, the ISO/IEC 15504 Software Process Improvement and Capability Determination (SPICE), eHealth Readiness Instrument for developing countries and the Layered Telemedicine Implementation Model. The validity of this maturity model is tested by means of a focus group discussion, during a workshop of provincial representatives from a provincial department of health (DoH). In conclusion, follow-up work is proposed for the development and validation of future versions of this framework towards a maturity model for telemedicine projects.
- ItemViability of telemedical remote robotic systems(Industrial Engineering, Stellenbosch University, 2011-09) Smit, A.; Van der Merwe, A. F.Worldwide, the demand for telemedicine devices and systems has risen steadily in recent years. The design of remote robotic systems has always been a complex undertaking. Technological limitations affecting bandwidth and access to communications infrastructure have impeded the advancement of a long distance remote robotic telemedicine system training purposes. Assessing the commercial viability and acceptability will be achieved by evaluating responses from expert user groups. This plays a crucial role in the development of future systems as well as providing expert-user data on user perception of such systems and data on the current viability of long distance patient care. An assessment of the information that is required to be presented to the medical professional in both training and diagnostic situations would have to be completed by making use of questionnaires and interviews. The system will be developed using low cost technologies with support structures in place as to facilitate financial feasibility and minimization of complexity along with intuitive control inputs. The results of the study will provide valuable information for the future development of commercially viable robotic telemedicine systems in South Africa.
- ItemXAP - an open source protocol for eHealth(Industrial Engineering, Stellenbosch University, 2011-09) Van der Merwe, A. F.In a recent SAIIE conference paper it was suggested to use xAP protocol in the telemedicine environment. Telemedicine has since been described to evolve into eHealth where the focus is not only on the remote control of health systems, but now also includes local control. This wider scope is necessary to allow seamless communication amongst systems, irrespective to whether they are in the same room or in a remote location. Local communication is via intranet with a higher data transport rate than internet. Larger data packages can be transported than economical on the internet. This research proposes a framework using a xAP datagram instead of sending the complete data package. It will only broadcast the availability of a data package to both local and remote systems. The bulk content can then be requested for download to local and remote systems either in compressed or uncompressed format. The xAP datagram carries information on the formats that the bulk data can be downloaded in. Intelligence at the retriever would decide which format to download. The compression format can be negotiated at download time. Protocols utilized are UDP for xAP broadcasting and TCP for bulk data retrieval. Scope: It is important to note that this research is on the efficacy of a datagram to broadcast data availability announcements and not on the design of a database. Also that data retrieval via TCP is not considered as it is used for bulk content retrieval after the announcement and only when an internet link is available. Lastly the bulk content download format negotiation is already available by others, usually “APP” developers of smart devices or similar.