05. Harjoitustyöt ja kurssitutkielmat / Coursework and Term papers, Final projects

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Yliopistossa suoritettujen opintojen harjoitus- ja lopputöitä / Coursework, term papers and final projects completed at the university

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Browsing 05. Harjoitustyöt ja kurssitutkielmat / Coursework and Term papers, Final projects by Department "Department of Mechanical Engineering"

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    Development of a large scale bearing element thickness variation measurement device
    (Aalto University, 2016) Gruber, Gregor-Julian; Widmaier, Thomas; Quurck, Lukas; Konetekniikan laitos; Department of Mechanical Engineering; Insinööritieteiden korkeakoulu; School of Engineering; Kuosmanen, Petri; Rinderknecht, Stephan
    This work describes the development and testing of a new type of bearing element thickness measurement device specifically designed for large scale bearings. The device is built around a sensor head featuring two tactile sensors that enable differential measurement of the thick-ness. After analyzing an older prototype the new device and corresponding software that was devel-oped as part of this work is explained in detail. Those chapters focus on the features that were built into the device to improve measurement quality and ease of use in general. Based on the design an actual machine prototype was built and tested against a reference grade coordinate measurement machine. Through repeated comparative measurement and statistical analysis the measurement quality was assessed in terms of repeatability, trueness and other parameters. Examining the measurement results from both devices the feasibility of using such a device and its advantages and disadvantages compared to a conventional machine are discussed.
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    Pilot-scale experimental work on sustainable process method of production of precipitated calcium carbonate from steel slag and carbon dioxide
    (Aalto University, 2016) Martínez Miras, Obdulia Natalia; Said, Arshe; Konetekniikan laitos; Department of Mechanical Engineering; Insinööritieteiden korkeakoulu; School of Engineering; Järvinen, Mika
    Steel is the most manufactured metal in the world, last year 1665 million tones were produced. What is more, in the last decades steel production has increased exponentially. Apart from being the most important metal in industry, it is a major source of carbon dioxide emissions, waste and energy consumption. In a world who is more concerned about global warming every day, trying to reduce greenhouse gas emissions, it is necessary to try to find ways to reduce these emissions. The production of steel generates steel slag, a by-product that can be utilized in industry due to its high calcium content, avoiding then the need of sending it to landfill. Slag2PCC is a process in which is possible to use the steel slag to convert it to precipitated calcium carbonate (PCC). Carbon dioxide flows are used in the process, meaning that it is a way to reduce carbon dioxide emissions and at the same time reduce energy waste. This is done in two stages: precipitation and carbonation. Precipitation has been studied thoroughly, so carbonation has been the aim of the study. Tests have been done both in the pilot scale plant and in a laboratory, in order to obtain a specific crystal morphology of PCC, scalenohedral form of calcite. When performing the tests in the pilot plant scale it was not produced scalenohedral, we performed tests in laboratory scale. This could reduce time and money, as reactor in the laboratory scale was 5 L and in the laboratory scale was 200 L. Different tests were done varying carbon dioxide flow used and the quantity of solution flow entering and leaving the reactor. Cost of producing PCC was estimated as 581.83 euro/ton PCC produced based on the parameters utilized in the pilot plant scale. This price is in range of expected if we consider the pilot plant scale as a big scale process.