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Dissertations / Theses on the topic 'Floating ring'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Vasco, Veronica. "Development of a cantilevered floating ring seal." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670019.

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2

Rivadeneira, Juan Carlos. "Predictions versus measurements of turbocharger nonlinear dynamic response." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3723.

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The present work advances progress on the validation against measurements of linear and nonlinear rotordynamic models for predicting the dynamic shaft response of automotive turbochargers (TCs) supported on floating ring bearings. Waterfall spectra of measured shaft motions at the compressor and turbine ends of a test TC rotor evidences a complex response, showing synchronous (1X) and multiple subsynchronous frequencies along the entire operating speed range (maximum shaft speed ~ 65 krpm). Postprocessing of the raw test data by mathematical software allows filtering the synchronous and subsyn

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3

McLarnon, Christopher Norman. "The non-linear response of overhung rotors in floating ring bearings." Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/613.

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4

Nowald, Gerrit Edgar. "Numerical Investigation of Rotors in Floating Ring Bearings using Co-Simulation." Phd thesis, Studienbereich Mechanik, 2018. https://tuprints.ulb.tu-darmstadt.de/8186/1/20181112_Nowald_Dissertation.pdf.

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In this work, the nonlinear oscillation behavior of rotors in floating ring bearings is investigated numerically by means of transient run-up simulations. Non plain bearing designs are considered, which are commonly used in turbocharger applications. Furthermore, a mass-conserving cavitation model based on two-phase theory is employed, which is well suited for transient journal motions due to subsynchronous oscillations. Special axial boundary conditions are introduced, which better reflect open-ended bearings. In contrast to classical cavitation approaches, which assume degassing of dissolved

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5

MARQUES, RENNER GUILHERME DA COSTA. "STUDY OF FEASIBILITY IN REPLACING IN A CENTRIFUGAL PUMP THE STATIC WEAR RING BY A FLOATING WEAR RING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26598@1.

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PETRÓLEO BRASILEIRO S. A.<br>Grande parte dos sistemas de bombeamento existentes em refinarias é do tipo centrífuga com rotor em balanço. Alguns desses sistemas, que foram fabricadas antes da década de 80, ainda estão sendo usadas em refinarias no Brasil. Tipicamente estes equipamentos possuem rotores muito flexíveis. Isto ocorre devido ao alto valor da razão entre a distância entre mancais e o diâmetro do eixo e também por causa da substituição de gaxetas, que oferecem rigidez, por selos mecânicos. Como consequência, a resposta dinâmica destes equipamentos é sensível à pequenas variações da f

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6

Tian, Liang. "Investigation into nonlinear dynamics of rotor-floating ring bearing systems in automotive turbochargers." Thesis, University of Sussex, 2012. http://sro.sussex.ac.uk/id/eprint/43029/.

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As a high speed rotating device, a modern turbocharger rotor is commonly supported by floating ring bearings (FRBs), owing to their cost effectiveness for mass production and good damping performance. Thanks to the rapid growth of the power of the modern computer, rotordynamic analysis of turbocharger rotor-bearing systems becomes feasible, and it is closely related to the healthy operation and noise generation of turbochargers. The work in this thesis is concerned with the nonlinear rotordynamic modelling, simulation and analysis in the rotor-FRB system of turbochargers. The conventional line

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7

Leung, P. S. "An investigation of the dynamic behaviour of floating ring bearing systems and their application to turbogenerators." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384577.

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8

Nowald, Gerrit Edgar [Verfasser], Bernhard [Akademischer Betreuer] Schweizer, and Michael [Akademischer Betreuer] Schäfer. "Numerical Investigation of Rotors in Floating Ring Bearings using Co-Simulation / Gerrit Edgar Nowald ; Bernhard Schweizer, Michael Schäfer." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1171988168/34.

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9

Борщенко, Д. А. "Построение математической модели и компьютерный анализ динамики системы ротор - плавающее уплотнение". Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40474.

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Уплотнения с плавающими кольцами представляют собой совокупность торцового и щелевого уплотнений. Плавающее кольцо способно центрироваться относительно вала благодаря гидродинамическим силам в кольцевой щели. Последнее условие позволяет выполнять малые радиальные зазоры, тем самым снижая утечки. Плавающие кольца не вращаются, что резко уменьшает мощность на трение и снимается проблема их охлаждения.

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10

Michalec, Jiri, and Sylvie Niklasova. "Water uptake of hardwoods." Thesis, Växjö University, School of Technology and Design, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-960.

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<p>This study investigate water uptake in six different species of hardwood in tangential and radial section. Alder (Alnus glutinosa) and beech (Fagus sylvatika) represent semi-diffuse-porous hardwoods. Aspen (Popolus tremula) and birch (Betula pubescens) represent diffuse-porous group; oak (Quercus robur) and ash (Fraxinus excelsior) the ring-porous hardwoods. Spruce (Picea abies) was used as a reference sample.</p><p>Significantly higher water uptake was observed in the diffuse-porous and the semi-diffuse-porous group. Water uptake varied among the species, nevertheless tangential section wa

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11

Mariot, Antoine. "Analyse théorique et expérimentale des joints d'étanchéité à bague flottante et des joints rainurés segmentés." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2292/document.

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Ce mémoire présente une étude théorique et expérimentale de joints annulaires à bague flottante ainsi que de joints rainurés segmentés, destinés à assurer l’étanchéité dynamique au sein de machines tournantes à haute vitesse dans les domaines aéronautique et aérospatial. Des joints annulaires à bague flottante ont été testés sur un banc d’essais dédié au sein de l’institut Pprime pour de multiples configurations de vitesse de rotation et de différence de pression étanchée. La réponse dynamique des joints par rapport aux vibrations du rotor a été étudiée pour différentes amplitudes de l’excitat

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12

Міщенко, Світлана Олексіївна, Светлана Алексеевна Мищенко та Svitlana Oleksiivna Mishchenko. "Механізм роботи і галузі застосування ущільнень з плаваючими кільцями". Thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/67550.

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13

Wood, Chris, and Dan Smith. "Dendroglaciological Evidence for a Neoglacial Advance of the Saskatchewan Glacier, Banff National Park, Canadian Rocky Mountains." Tree-Ring Society, 2004. http://hdl.handle.net/10150/262633.

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Seventeen glacially sheared stumps in growth position and abundant detrital wood fragments were exposed by stream avulsion at the terminus of the Saskatchewan Glacier in 1999. The stumps lay buried beneath the glacier and over 5 m of glacial sediment until historical recession and stream incision exposed the 225- to 262-year-old stand of subalpine fir, Englemann spruce and whitebark pine trees. Crossdating and construction of two radiocarbon-controlled floating tree-ring chronologies showed that all the subfossil stumps and boles exposed at this location were killed during a Neoglacial advance

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14

Bastidas, Moncayo Kared Sophia. "Experimental and analytical study of the mechanical friction losses in the piston-cylinder liner tribological pair in internal combustion engines (ICE)." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/172188.

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[ES] Con el aumento de la demanda de soluciones más amigables con el medio ambiente en la industria de la automoción, el motor de combustión interna alternativo (MCIA) enfrenta actualmente grandes desafíos para minimizar su consumo de recursos no renovables y especialmente, para reducir sus emisiones contaminantes. Debido a que el aporte de los MCIAs es fundamental para cubrir las necesidades de movilidad y de generación de energía alrededor de todo el mundo, y el hecho de que diferentes alternativas, como los motores eléctricos e hibrido, están y continuaran enfrentado múltiples obstáculos pa

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15

HONG, ZENG-SYUAN, and 洪增軒. "Investigation of Floating Field Ring Structure." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jqk877.

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碩士<br>國立宜蘭大學<br>電子工程學系碩士班<br>106<br>In recent years, the rapid development of semiconductor technology and the progress of human science and technology, the development of modern power electronic technology, how to get better in the breakdown voltage and high speed is an important focus of development, this paper used for both terminl structure of the Field ring, to optimize the structure, which were discussed respectively. At both ends of the PN component and Field ring, and then change the position of the electric field , potential and charge distribution, to analyze optimization of the brea

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16

LO, CHO-YEN, and 羅卓彥. "Comprehensive Studies of Floating Field Ring with Different Ring Depth." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7g7e7j.

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碩士<br>國立宜蘭大學<br>電子工程學系碩士班<br>106<br>In this study, we used the Transactions on Computer-Aided Design (TCAD) of Integrated Circuits and Systems, developed by company of commercial devices simulator, to research and analyze the physical characteristics of two-dimensional devices. We designed and investigated a PN Diode with 12 µm in width and 20 µm in height by ATLAS device Simulator. Because the current was limited by the depletion region, we added the Floating Field P-Ring structure and Multiple Floating Field P-Rings structure. Through the extension of the depletion region, it would increase

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17

Chen, Yi-Yun, and 陳翊云. "Design and Test of Hydrostatic Bearing with Floating Ring." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5w3kh5.

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18

WU, WEN-KAI, and 吳文凱. "An Improved Breakdown Performance of Diode by Floating Field-ring." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/r6n66d.

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碩士<br>國立宜蘭大學<br>電機資訊學院碩士在職專班<br>107<br>In semiconductor discrete component products,the process architecture are divided into Vertical and Lateral,the TCAD simulation software developed by SILVACO in the USA to used explore and analyze the physics of semiconductor Devices,depend on the N-type substrate,the P-type Multiple floating multi-field rings structure are added to extend the depletion region . In the first chapter of this paper,we will introduce briefly what is diode.Second chapter include the PN junction,the depletion region,the electric field,the Potential and the reverse withstand vo

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19

Wang, Ting-Yu, and 王挺宇. "Design of Hydrostatic Bearing with Floating Ring and Experimental Test Platform and Test Results." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8tg7sg.

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20

Jhang, Jyun-Jia, and 張峻嘉. "Electro-optical characteristics of hole-patterned large aperture liquid crystal lens with embedded floating ring electrode." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/19801910889058022992.

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碩士<br>國立彰化師範大學<br>光電科技研究所<br>104<br>The conventionally hole-patterned large aperture liquid crystal (LALC) lens requires a thick dielectric layer inserted between the hole-patterned electrode and the LC layer to extend the fringing field into the center of the LALC lens, which therefore has the disadvantages of heavy weight, high operating voltages, and low lens power. In the study, we design a novel hole-patterned LALC lenses with an embedded floating ring electrode (FRE). The embedded FRE increases the electric field strength around the FRE in the LC layer and as a consequence extends the fr

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21

Liu, Yi-Jun, and 劉羿君. "Analysis and improvement of electro-optical performance of liquid crystal lens with embedded floating ring electrode." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9hk5m4.

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碩士<br>國立彰化師範大學<br>物理學系<br>106<br>In the past, a large-aperture hole-patterned liquid crystal (LC) lens with implanted a floating-ring electrode (FRE) between the hole-patterned electrode and LC layer had been proposed. Unfortunately, the issues of disclination lines and slow fall time existed in the structure when a voltage is supplied. In this study, the influence of cell gap on disclination lines of the large aperture hole-patterned LC lens was investigated. Furthermore, the polymer stabilized method was used to accelerate the fall time of FRE LC lens by the strong anchoring provided from po

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