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141	Modelling, simulation and optimisation of a crushing plant Ndhlala, Blessing 07 1900 (has links) African copper PLC’s flagship is the copper producing Mowana mine located 129 km from Francistown in the North-Eastern part of the Republic of Botswana. The processing operation at Mowana is a standard flotation plant designed to produce copper concentrates from oxide, supergene, and sulphide ores. The expected average output of 16.2 tons per hour of copper concentrates has never been attained since plant commissioning. The major bottleneck has been established to be located around the crushing circuit of the Mowana production chain. The major hypotheses of this research are that performance in a crushing plant is adversely influenced by moderate and discrete changes in the process. The ultimate objective is to develop a dynamic process simulator, administered in Simulink/MATLAB® background, for application in the design of a control model utilising two crusher variables and a self-tuning control algorithm. In this research work, a process model describing the dynamic operation of an Osborn 57S gyrasphere cone crusher is investigated. Modelling of the Mowana crushing circuit is carried out by combining the steady-state and dynamic components of the crushing equipment in the Simulink/Matlab® environment. Eccentric speed (ES) and closed-side setting (CSS) are amongst the important inputs to the models. The rest of the inputs (crusher power, crusher cavity level, federate, pulley diameters, liner wear measurement, number of teeth of the pinion and bevel gear) are extracted from the data collected across the Mowana mine crushing circuit. While it has been demonstrated that the crusher CSS is the most influential controllable parameter, it has also been demonstrated that crusher capacity and power can be used effectively to optimise the circuit. The use of crushing power and cavity level control is suitable for the crushing circuit since the crushers are running on a constant ES and the CSS is set and reset manually. The outcome of the study presents an insight into the optimization of the Mowana mine crushing circuit through the design of a self-tuning controller for the cone crusher and for prototyping, parameters of a PID controller were determined in the Simulink/MATLAB® environment. The simulation involved the optimisation of the control model as a function of the cavity level of and the power drawn by the cone crusher. A self-tuning control algorithm at PLC and SCADA level of control was then tested. This formed the simulations and training platform. The outcome of the simulations carried out in this research needs to be validated against the real Mowana crushing process control upgrade. This will then inform the modifications and recommended crusher motor resizing exercise to be implemented. / Electrical and Mining Engineering / M. Tech. (Engineering: Electrical) Choke feeding Closed Circuit Comminution Crushing plant Crushing Ratio Dynamic Simulation Flakiness Index Grading Liner Mantle Optimisation Power draw Reduction Ratio Screening Segregation Software development 622.730113
142	An Investigation of the Impact Gender-Specific Course Grouping Has on Female Middle-School Students' Concept of and Interests Toward Technology and Engineering Walsh, Thomas Broderick 06 August 2021 (has links) Attempts to improve retention, interest, and enrollment of females in Technology & Engineering Education courses have included a variety of approaches including female-only classes. However, the implications of such courses have not been thoroughly investigated. Therefore, an investigation of female-only classes was undertaken; the findings revealed that the overall enrollment of females went up in the course and in subsequent classes, these students maintained their interests and attitudes towards Technology and Engineering, their perceptions of an engineer's gender changed from that of mostly male to mostly female, and their concepts of what an engineer does changed from mostly building or fixing things to that of mostly someone who designs. This study used two instruments: the Technology Engineering Attitude Survey (TEAS) and the Draw an Engineer Test (DAET). The population of the study was 7th grade middle school students. They were placed into two groups: the control being the mixed male female engineering and technology classes, and the treatment being the all-female students enrolled in the same engineering technology course. technology engineering female women girls male men boys technology engineering attitude survey teas draw an engineer test daet technology and engineering engineering and technology education technology and engineering education science technology engineering math stem science technology engineering art math steam non-traditional careers women in engineering k-12 middle School junior high public school utah usa industrial education vocational education stem education steam education teaching Engineering
143	Řízení dynamických systémů v reálném čase / Real Time Dynamic System Control Veigend, Petr January 2014 (has links) This thesis deals with the real time dynamic system control and it uses similar computation methods as earlier bachelor thesis. In the beginning of the thesis, some basics from the field of control and regulation are explained. Systems in this thesis are mostly described by differential equations. Because of this, thesis contains a section about solving differential equations. In this section, multiple approaches are covered and compared. The Modern Taylor series method is introduced, which is used by implemented applications. For system simulation, existing software was upgraded and multiple additional utilities were also implemented. The approximation of the transport delay is also mentioned.
144	Endogenic Production : subjective matter and bodily involvement Ställborn, Nils January 2022 (has links) The word endogenic means growing or proceeding from within, it is commonly used to describe the process of tectonic movement and earth crust formation caused by the extrusion of magmatic material. My project is a metaphorical exploration of the geological term “endogenic process” as well as an exploration of a design approach based on the term.The work explores soft form-bearing structures and textile bodies that contrast in relation to the hard framework of the rectangular room. It touches on material hierarchies in the living environment and the field of spatial design. The research explores the relationship between interior bodies and spatial frameworks. It aims to highlight the importance of the subject within the framework of the rectangular space that divides the interior of most buildings. My work involves exploring the endogenic process as a way of relating to the creative process and through the use of soft structures and drapery creating furniture that engages people with the spatial framework of the rectangular room. It is an exploration of spatial furniture that constitutes a connection and physical involvement between bodies and space, a kind of furniture providing a multiplicity of possibilities. Spatial design interior architecture interior design textile furniture textile structure soft structure squiggly structures drafting draw drawstring drawstring furniture furniture furniture design textile architecture Baroque sewing furniture form-production endogenic exogenic endogenic approach endogenic process tectonic production rectangular room clothes architecture body design method wool Texel wool folds pleats material hierarchies the senses draping shape sustainable norm criticism exploring Humanities and the Arts Humaniora och konst

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