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Rozprawy doktorskie na temat „ROLLING BALL”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Huq, Fazul, and dpmeng@bigpond com. "Development of Life Prediction Models for Rolling Contact Wear in Ceramic and Steel Ball Bearings." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080215.145624.

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The potential for significant performance increases, using ceramic materials in un-lubricated rolling element bearing applications, has been the subject of research over the past two decades. Practical advantages over steel include increased ability to withstand high loads, severe environments and high speeds. However, widespread acceptance has been limited by the inability to predict wear life for ceramic bearing applications. In this thesis, the rolling contact wear of 52100 bearing steel and Over-aged Magnesia-Partially-Stabilised Zirconia (OA-Mg-PSZ) ceramic are examined using a n

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Donà, Marco. "Rolling-Ball Rubber-Layer system for the lightweight structures seismic protection: experimentation and numerical analyses." Doctoral thesis, Università degli studi di Trento, 2015. https://hdl.handle.net/11572/368225.

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Protection of high-value building contents from seismic damage represents a worldwide challenging task. Artefacts, sophisticated medical and electrical equipment, high performance computer installations and other special contents have shown, in the last years, their high vulnerability both for high and moderate earthquakes. The lack of effective techniques, sufficiently developed for seismic risk mitigation of such objects, makes the seismic protection of contents a crucial issue. An effective means to provide this protection is seismic isolation. The isolation techniques to be used for the co

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Donà, Marco. "Rolling-Ball Rubber-Layer system for the lightweight structures seismic protection: experimentation and numerical analyses." Doctoral thesis, University of Trento, 2015. http://eprints-phd.biblio.unitn.it/1489/1/PhD_Thesis_Don%C3%A0Marco.pdf.

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Protection of high-value building contents from seismic damage represents a worldwide challenging task. Artefacts, sophisticated medical and electrical equipment, high performance computer installations and other special contents have shown, in the last years, their high vulnerability both for high and moderate earthquakes. The lack of effective techniques, sufficiently developed for seismic risk mitigation of such objects, makes the seismic protection of contents a crucial issue. An effective means to provide this protection is seismic isolation. The isolation techniques to be used for the co

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4

森, 敏彦, Toshihiko MORI, 健治広田, Kenji HIROTA, 進幸千田 та Shinko SENDA. "プラネタリ・ボール・ローリング (PBR) 加工による円管内外表面同時仕上げ". 日本機械学会, 2002. http://hdl.handle.net/2237/9025.

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Mutyala, Kalyan Chakravarthi. "Influence of Metallic, Dichalcogenide, and Nanocomposite Tribological Thin Films on The Rolling Contact Performance of Spherical Rolling Elements." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1447751680.

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Xin, Ge. "Sparse representations in vibration-based rolling element bearing diagnostics." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI051/document.

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Bien que le diagnostic des roulements par analyse vibratoire soit un domaine très développé, la recherche sur les représentations parcimonieuses des signaux de vibration est encore nouvelle et difficile pour le diagnostic des machines tournantes. Dans cette thèse, de méthodes nouvelles ont été développées, au moyen de différents modèles stochastiques, associées à des algorithmes efficaces afin de servir l’industrie dans le diagnostic des roulements. Tout d’abord, les modèles parcimonieux présentés dans la littérature sont revus. Les principales publications concernant le diagnostic des machine

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Newkirk, Matthew Stanton. "Design and Development of a High-Temperature High-Pressure Rolling Ball Viscometer/Densimeter and Evaluation of Star Polymer-Solvent Mixtures." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4654.

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Modern automotive applications such as transmission clutch plates, combustion chambers, diesel fuel injector tips, and axle gears and friction plates operate at temperatures that can exceed 250°C and pressures of 40,000 psia. Industrial practice is to add homopolymers and copolymers to base oils to modify bulk fluid viscosity and frictional properties for these demanding applications. However, designing polymeric additives for lubricants and predicting their performance is limited by the lack of available high-temperature high-pressure (HTHP) viscosity and density data needed to test contempor

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Biscolla, Laura Maria da Cunha Canto Oliva. ""Controlabilidade do rolamento de uma esfera sobre uma superfície de revolução"." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/45/45132/tde-31072006-141249/.

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O trabalho apresenta inicialmente os conceitos clássicos de rolamento (sem escorregamento e sem pivotamento) de uma superfície sobre outra usando os triedros de Darboux das duas superfícies ao longo das respectivas curvas de contato. Mostra, ainda, a equivalência desses conceitos com outras definições. A seguir, estuda-se a controlabilidade no problema do rolamento de uma esfera sobre uma superfície S de revolução, tanto no caso de rolar sem escorregar como no caso de não escorregar e não pivotar; a controlabilidade visa determinar a atingibilidade entre dois 'estados' da esfera (posição em S

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9

Gao, Wenjun. "Modelling of windage and churning losses in high speed rolling element bearings." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI048/document.

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Dans un système de machines rotatives comme un moteur à turbine, les paliers d'éléments roulants à grande vitesse jouent un rôle important dans le support de l'arbre ou du rotor rotatif, et ont besoin d'une lubrification pour assurer leur fonction. Sauf qu'une petite quantité d'huile est nécessaire pour former le film lubrifiant élastohydrodynamique dans la zone de contact, la plus grande partie du lubrifiant reste en suspension dans l'air, formant un mélange huile/air. Ce phénomène entraîne des pertes hydrauliques parasitaires excessives lorsque les éléments roulants se translatent et tournen

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10

Valenta, Jakub. "Vývoj metody pro hodnocení režimu mazání ve valivém ložisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417738.

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The aim of this master’s thesis is to develop measuring methods for evaluation of the lubrication regime in a rolling bearing. The first part of thesis maps several measuring methods according to which the lubrication mode can be evaluated. Based on the assessment of this part, electrical monitoring methods were selected. For application of these methods was constructed testing device with rolling bearing. Specific measuring chains based on selected methods were designed and verified by using initial tests on a ball-on-disk tribometer. According to the results of these initial measurements was

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11

Rowane, Aaron J. "High-Temperature, High-Pressure Viscosities and Densities of Toluene." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4188.

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High-temperature, high-pressure (HTHP) conditions are exemplified in ultra-deep petroleum reservoirs and can be exhibited within diesel engines. Accurate pure component hydrocarbon data is essential in understanding the overall behavior of petroleum and diesel fuel at these conditions. The present study focuses on the HTHP properties of toluene since this hydrocarbon is frequently used to increase the octane rating of gasoline and toluene occurs naturally in crude oil. In this thesis experimental densities and viscosity are presented to 535 K and 300 MPa extending the database of toluene visco

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12

Azianou, Ayao Elewovem. "Modélisation numérique de la durée de vie de roulements à bille à gorges profondes montés dans des alternateurs automobiles." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS007/document.

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Les conditions de fonctionnement rencontrées dans la problématique de nouvelles générations d'alternateurs automobiles avec des chargements variables et un environnement mécanique complexe déformable ont un effet non négligeable sur le comportement mécanique du roulement et par conséquent sur sa durée de vie. Il est proposé dans ce travail une approche permettant de prendre en compte ces paramètres dans l'estimation de la durée de vie des roulements. La répartition des efforts obtenue des considérations statiques sont utilisés dans un modèle dynamique simplifié permettant de déterminer de l'ét

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Cozza, Ronaldo Câmara. "Estudo do desgaste e atrito em ensaios micro-abrasivos por esfera rotativa fixa em condições de força normal constante e pressão constante." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-26082011-143752/.

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O ensaio de desgaste micro-abrasivo por esfera rotativa vem conquistando elevada aceitação em universidades e centros de pesquisa, sendo amplamente adotado em estudos envolvendo desgaste abrasivo de materiais. Dois modos de desgaste abrasivo podem ser observados neste tipo de ensaio: rolamento resulta quando as partículas abrasivas rolam sobre a superfície do corpo-de-prova, enquanto riscamento é observado quando as partículas abrasivas deslizam sobre o mesmo; o tipo do modo de desgaste abrasivo apresenta uma significante influência sobre o comportamento de um sistema tribológico. Diversos tra

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14

Niel, Dimitri. "Etude du comportement thermomécanique de paliers à roulements pour une application hautes vitesses." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI007/document.

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Avec l’apparition de moteur électrique dans le secteur automobile, les réducteurs mécaniques fonctionnent à des vitesses de rotation de plus en plus élevées. Pour ce type de réducteur, les pertes de puissance au niveau des paliers à roulements peuvent être prédominantes pour des vitesses de rotation élevées. Ces pertes sont fortement dépendantes du comportement thermique du palier à roulement. D’où l’intérêt de développer des outils numériques permettant d’estimer les puissances générées au sein d’un palier à roulement. Cette estimation permettra en phase de pré-étude de développer un disposit

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15

Berthe, Laure. "Durée de vie des contacts rugueux roulants." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0097/document.

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La tenue des surfaces des contacts rugueux roulants est un problème crucial l’évaluation de la durée de vie des mécanismes. Cette durée de vie est conditionnée dès les premiers cycles par le rodage puis par les mécanismes de fatigue des surfaces. Le rodage est défini par le temps nécessaire à l’accommodation géométrique des surfaces rugueuses entre elles, à l’interface du contact. La charge transmise sur une faible aire de contact par rapport à l’aire apparente, crée des pressions importantes qui induisent de fortes contraintes en couche superficielle et des déformations plastiques de la micro

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16

Toumi, Mohamed Yessine. "Étude de l'endommagement des composants mécaniques soumis à de la fatigue de roulement dans le cadre d'une maintenance prédictive : cas des butées à billes." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS033.

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Le roulement est un élément essentiel dans la conception des machines tournantes. À l'échelle industrielle, sa défaillance peut avoir de coûteuses conséquences. La maintenance prédictive sert à minimiser les coûts d'entretien et à prévenir de l'état de fatigue du composant mécanique. Dans ce cadre, nous proposons une étude de l'endommagement par fatigue de contact de roulement appliquée au cas des butées à billes. Cette étude se structure en deux axes : numérique et expérimental. Le premier consiste à établir une modélisation numérique tridimensionnelle dynamique du passage cyclique d'une bill

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17

Bovet, Christophe. "Contribution à la modélisation du comportement dynamique des paliers à roulements de réducteurs aéronautiques." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4022.

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La quête de minimisation du ratio poids-puissance, omniprésente dans l'industrie aéronautique, conduit à une plus grande souplesse structurelle des boîtes de transmission de puissance d'hélicoptères.Cette souplesse structurelle, associée aux sollicitations sévères mises en jeu, entraîne des déformations non négligeables des arbres et carters, et nuit naturellement à la tenue en service des roulements.S'il n’est pas maîtrisé, le désalignement des portées de roulements accroît fortement les efforts vus par la cage et peut conduire à sa rupture en fatigue.Le travail proposé s'intéresse à la modél

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18

Silva, Renata Reis da. "Análise exploratória do efeito do solvente na análise de metabólitos secundários das folhas de Rollinia mucosa (Jacq.) Baill por métodos quimiométricos." Universidade Estadual de Londrina. Centro de Ciências Exatas. Programa de Pós-Graduação em Química dos Recursos Naturais, 2009. http://www.bibliotecadigital.uel.br/document/?code=vtls000147950.

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Planejamento estatístico de misturas de cinco componentes e métodos quimiométricos de analise multivariada foram usados para avaliar o efeito dos solventes na extração dos metabólitos secundários das folhas da Rollinia mucosa (Jacq.) Baill, popularmente conhecida como pinha ou fruta do conde. O poder de extração de cada solvente ou misturas de solventes foi avaliado pela diversidade de compostos extraídos, representado pelo número de picos cromatográficos. Os rendimentos dos extratos brutos e fracionados também foram avaliados. Três fases móveis com diferentes forças cromatográficas foram aval

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Liu, Min-Yin, and 劉明音. "Sleep spindle detection using rolling ball sifting." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/37t9vp.

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博士<br>國立中央大學<br>系統生物與生物資訊研究所<br>105<br>Sleep spindles are brief bursts of brain activity in the sigma frequency range (11–16 Hz) measured by electroencephalography (EEG) mostly during non-rapid eye movement (NREM) stage 2 sleep. These oscillations are of great biological and clinical interests because they potentially play an important role in identifying and characterizing the processes of various neurological disorders. Conventionally, sleep spindles are identified by expert sleep clinicians via visual inspection of EEG signals. The process is laborious and the results are inconsistent among

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Wang, Tzong-Terng, and 王宗騰. "Effect of Different Rolling Types and Goal-setting on Ball-rolling Performance of Children." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/02453335232818878789.

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曾緯翔. "The Energy Conversion of a Rolling-Ball Hydroelectric Generator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/11338462168128231024.

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Oglice, Eunic A. "Pushing the boundaries of housewifery Lucy gets the ball rolling /." 2004. http://purl.galileo.usg.edu/uga%5Fetd/oglice%5Feunice%5Fa%5F200405%5Fma.

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Thesis (M.A.)--University of Georgia, 2004.<br>Directed by Dwight E. Brooks. For abstract see http://getd.galib.uga.edu/hold5yr/oglice_eunice_a_200405_ma/oglice_eunice_a_200405_ma.pdf. Includes bibliographical references (leaves 71-76).

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CHEN, KUAN-LIN, and 陳冠霖. "Effects on Tea Quality Influenced by Different Ball-rolling Processes." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/75862224149014441674.

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碩士<br>亞洲大學<br>生物資訊與醫學工程學系碩士在職專班<br>104<br>The process for producing Taiwan oolong tea is relatively complex. In particular, the work involved to knead and shape the tea requires a lot of manpower and time. This article examines traditional and modern processes (whether to use tea compressing machines) for unprocessed tea, and conducts an analysis and evaluation of the different roasting times, bulk density used, water content, old and young tea leaves, removal rate of tea stems and yellowed pieces, chemical compositions, and colorimetric to compare the differences between the two processes. T

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Cheng, Tung-sheng, and 鄭東昇. "A study of micro hydroelectric power generated by a rolling ball." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/45706549443626860946.

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碩士<br>逢甲大學<br>機械工程學所<br>97<br>Abstract In this experiment, an inclined jet impinges a styrofoam ball, the ball was rotated and converted the kinetic energy into the electric energy, the feasibility of the micro hydroelectric power generation were study in this paper. The jets with the diameters of 5.5、4.5、3.5mm and the different jet velocities of impinge the balls with the diameters of 70mm, 58mm, and 45mm, respectively. Thus to keep the ratio of ball diameter to jet diameter in the value of 12.83. Jets with different velocities impinge the different balls results show that, the torque, angu

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Leu, Hui-Chung, and 呂惠中. "The Effect of Rolling Resistance on the Performance of Automatic Ball Balancer." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/77781933084594470419.

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碩士<br>國立清華大學<br>動力機械工程學系<br>89<br>The rolling resistance between the balls and the wall of the automatic ball balancer (ABB) significantly influences the balancing performance of the optic disk drive system from theoretical analysis and experimental observation. This thesis focuses on the study of the effect of rolling resistance on ABB. The investigation begins from constructing the mathematical model of the ball rolling resistance. It is followed by deriving the equations of motion for the balls and equivalent stator. Then the steady-state solutions are obtained and the stability of each

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"Design and Development of Rolling and Hopping Ball Robots for Low Gravity Environment." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38691.

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abstract: In-situ exploration of planetary bodies such as Mars or the Moon have provided geologists and planetary scientists a detailed understanding of how these bodies formed and evolved. In-situ exploration has aided in the quest for water and life-supporting chemicals. In-situ exploration of Mars carried out by large SUV-sized rovers that travel long distance, carry sophisticated onboard laboratories to perform soil analysis and sample collection. But their large size and mobility method prevents them from accessing or exploring extreme environments, particularly caves, canyons, cliffs a

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Lin, Chih-Ying, and 林志穎. "Implementation of Rolling-Ball Tracking System which Integrates CCD and INS for Wheeled Mobile Robots." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/85158053030946729176.

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碩士<br>中華技術學院<br>電子工程研究所碩士班<br>97<br>The hardware architecture and software programming of the image tracking system for the robot soccer are implemented and investigated in this thesis. Based on Matlab platform, the system is composed of (1) hardware structure of wheeled mobile robot, (2) host computer, (3) digital video camera system (4) wireless communication module. Firstly, digital video camera is used to detect the objects, the boundary sequence method evolved from the chain code is capable of detecting and classifying the objects. The method arranges boundary coordinates for each object

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Perrier, Marie-Josee. "Getting the Ball Rolling: Sport and Leisure Time Physical Activity Promotion Among Individuals with Acquired Physical Disabilities." Thesis, 2013. http://hdl.handle.net/1974/7916.

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Despite the physical health and psychosocial benefits, few individuals with acquired physical disabilities participate in sport. This manuscript-based thesis is composed of four studies that aim to provide a more nuanced understanding of the theoretical and contextual factors that influence sport participation among this population. Study 1 investigated the predictive value of the Health Action Process Approach (HAPA). The HAPA model has been used among a variety of populations; however, it has not been used to predict sport participation among adults with acquired physical disabilities nor ha

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LIN, HSUAN-PING, and 林軒平. "Effects of differential speed rolling and H2S poison on the hydrogen storage performance of ZK60 alloys ball-milled with Pd, Ag and Zr." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u82y2h.

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碩士<br>逢甲大學<br>材料科學與工程學系<br>105<br>In this study, the ZK60 alloy was refined by equal channel angular pressing (ECAP) and differential speed rolling(DSR) with rolling speed ratios of 6:3and 9:3. The alloys became metal filings by mechanical method, and the alloy powders were prepared by adding 5wt% carbon and various amounts of palladium, silver and zirconium, respectively, in ball milling for 20 hrs, to explore the microstructure of the alloy, low temperature hydrogen absorption / high temperature hydrogen desorption measurement, low temperature hydrogen absorption rate and H2S poisoning on h

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Makgoale, Dineo Mokganyetji. "Effects of mill rotational speed on the batch grinding kinetics of a UG2 platinum ore." Diss., 2019. http://hdl.handle.net/10500/26498.

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In this study, the effect of speed was investigated on the breakage rate of UG2 platinum ore in a batch mill of 5 dm3 and 175 mm internal diameter. One size fraction method was carried out to perform the experiment. Five mono-sized fractions in the range of 1.180 mm to 0.212 mm separated by √2 series interval were prepared. The fractions were milled at different grinding times (0.5, 2, 4, 15 and 30 min) and three fractions of mill critical speed were considered (20%, 30%, and 40%). The target of critical speed below 50% was due to the need of lower energy consumption in milling processe

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Hsu, Ming-Chun, and 徐銘君. "Investigations on the rolling motion of the hollow balls impinged by a water jet." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/45690492359402422418.

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碩士<br>逢甲大學<br>機械工程學所<br>91<br>The flow characteristics of the sphere impinged by an inclined water jet were studied in this paper. The water jet velocity and the inclined angle of the nozzle play an important role to explore the impinged sphere problem. In this study, we focus on investigations of the sphere impinged by a low speed water jet flow. Results reveal that the inclination of a water jet is necessary for the impinged sphere to spin around itself. The impinged sphere can be kept on spinning and floating in the air by using of the nozzle with the inclined angles ranging from 3.43 to

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Kuo, Reen-Yen, and 郭荏耘. "Chemical and Biological Studies on the Constituents of Rollinia mucosa Baill. and the Synthesis of Isoquinoline Derivatives." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/84767661870035281015.

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博士<br>高雄醫學大學<br>藥學研究所<br>91<br>In the continuing research of Formosan Annonaceous plants, the methanolic extracts of leaves and stems of Rollinia mucosa Baill. were investigated for their chemical constituents and biological activities, respectively. Fifty-one compounds were isolated including twenty-eight alkaloids, three flavonoids, six lignans, five steroids, one acetogenin, one pyrrole, and seven benzenoids. Among these compounds, eight of them including (-)-artabonatine A (AP-10), romucosine A-D (AP-13~16), promucosine (PA-2), rollipyrrole (PY-1) and romucosine I (PH-1) are isolated as ne

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