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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Development of Test Rig and Experimental Evaluation of Hydrostatic Bearings for an Axial Flux Machine

Avdic, Amir, Vejendla, Kishore-Babu January 2022 (has links)
A novel electric machine design, similar to an axial flux machine, incorporates hydrostatic bearings to increase efficiency and stability of said machine. In this thesis, the feasibility of a hydrostatic solution is explored and evaluated by development, manufacturing, and assembly of a test rig, as well as running experimental tests with it. The experiments are designed to measure viscous losses in the contact area between a rotor disc and stator bearing pads, where the oil fil thickness is below 0.1 mm, simulating low rpm (50-150 rpm) working condition of a 1:1 scale simplified model of the novel machine. The effects on the viscous losses by the hydraulic oil film thickness, rotor disc speed and oil pump pressure are analyzed and compared with an analytical model provided by the inventing startup company. A regression analysis model based on the experimental data is also presented. / En ny elektrisk maskinkonstruktion, lik en axialflödesmaskin i design, innefattar hydrostatiska lager för att öka verkningsgraden och stabiliteten hos den nämnda maskinen. I detta examensarbete undersöks och utvärderas genomförbarheten av en hydrostatisk lösning genom utveckling, tillverkning och ihopmontering av en testrigg, samt genom att köra experimentella test med riggen. Experimenten är utformade för att mäta viskösa förluster i kontaktområdet mellan en rotorskiva och statorlager, där oiljefilmstjockleken är under 0.1mm, genom att simulera ett arbetstillstånd i modell skala 1:1 av för en förenklad variant av den nya maskinen, under lågt varvtal (50–150 rpm). Effekterna på de viskösa förlusterna av den hydrauliska oljefilmens tjocklek, rotorskivans hastighet och oljepumpens tryck analyseras och jämförs med en analytisk modell given av det uppfinnande startupföretaget.
12

Mazání a návrh dynamicky zatížených kluzných ložisek kompresorů / Lubrication and design of dynamically loaded journal bearings for compressors

Sikora, Tomáš January 2010 (has links)
Tato diplomová práce pojednává o návrhu ložisek kompresoru. Za tímto účelem byl zakoupen speciální program JDynamic. Tento software poskytuje cenný přínos při navrhování kluzných ložisek a s tím spojených problémů. Programové výsledky reálného kompresoru jsou obsaženy v parametrické studii. Byl proveden test reálného kompresru. Modifikace kluzných ložisek byly zaměřeny na snížení ztrát.
13

Testovací zařízení kluzných ložisek / Slide Bearings Test Bench

Palán, David January 2015 (has links)
This master’s thesis is focused on measurement of electrical contact resistance. The beginning of the thesis is devoted to the introduction of the electrical contact resistance and electrical parameters of journal bearings. Next part of the thesis deals with engineering design of test rig. In order to verify functional measurement principle, the test rig based on engineering design has been made. In the end of the thesis the measuring devices and the measuring process is described. The measurement results from the test rig are presented.
14

Stuck in the Truck: Oil Dependency, Acceleration, and the Nature of Catastrophe : An Ecocritical Reading of The Wages of Fear (Le Salaire de la Peur, Henri-Georges Clouzot, 1953)

Helgesson Ralevic, Sonya January 2020 (has links)
As a medium of modernity, film has always been entwined with the energy regime sustaining it. This thesis is interested in the interrelation between film and oil, and approached as a piece of petro-fiction, Henri-Georges Clouzot’s film The Wages of Fear (1953) is subject to a close, ecocritical analysis. A selection of four additional oil-films are used as points of comparison. By looking at a variety of representational and aesthetic aspects, the study explores how the film visualises the Anthropocene and negotiates the oil culture in which it exists. By reading the film in terms of oil, this thesis finds that the film in various ways expresses an entanglement with oil culture, while also criticising the same dependency. From the five oil films that have been analysed, catastrophe is an inherent motif, and part of the attraction of oil as subject matter, mirrored in broader culture of exuberance. In contrast to the other films, The Wages of Fear plays less into spectacle but opens to a critical examination of the various exploitations involved at the hands of the oil industry.

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