Dissertations / Theses on the topic 'Roller bearings'
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Liu, Chao-Shih. "Fault detection of rolling element bearings /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/7064.
Full textTU, MINGHUI. "Validation and modeling of power losses of NJ406 cylindrical roller bearings." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193590.
Full textIn most of machines, rotating parts are supported by many types of bearings which may have different requirements. In a gearbox, bearings are normally used to support gear shafts which allow the shafts to rotate freely and limit the axial and radial motion of the shafts. For improving of gearbox performance, it is important to minimize power losses and have high reliability. Power losses caused by bearings can be significant in gearbox system. To be able to predict bearing power losses accurately can give a better overview of the distribution of power losses in the system and is helpful for improving of gearbox performance. The main purpose of this project is to develop an accurate NJ 406 cylindrical roller bearing friction torque model. Numerous experiments were performed on a bearing test rig modified from a back-to-back gear test rig under different conditions, such as different rotating speeds, different loads, different oil level, etc. Based on the results from the experiments, analysis of three existing models, Palmgren, Harris and SKF, were performed. By separating the main research question into four sub research questions, the analysis and comparing between existing models and experimental data were also separated into load independent friction torque analysis, load dependent friction torque analysis, precision analysis and modeling. The influences of oil level, oil type, oil temperature, rotating speed and load on bearing friction torque were also studied. The results of precision analysis show the results of experiments in this project are repeatable and it is able to develop new bearing models by using these experimental results. Based on the experimental data, after modified, the load independent friction torque from Harris model fits the experimental data well. A new model of load dependent bearing friction torque was developed since none of the three existing models fit the experimental data. Therefore, a new NJ 406 cylindrical roller bearing friction torque model was developed which is modified Harris model for load independent friction torque and the new model for load dependent friction torque.
Osorno, Daniel. "Rolling element skew measurement in a spherical roller bearing utilizing a CPD probe." Thesis, Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-08242005-140539/.
Full textSteven Danyluk, Committee Chair ; David Sanborn, Committee Member ; Shreyes Melkote, Committee Member. Includes bibliographical references.
Qian, Weihua [Verfasser]. "Dynamic simulation of cylindrical roller bearings / Weihua Qian." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1049572718/34.
Full textNoury, Pourya. "On failure of high strength steel bridge roller bearings." Doctoral thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65215.
Full textCiabattoni, Dino. "A CADAM interface for the computer-aided selection of Timken tapered roller bearings." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101171.
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Moodie, Craig Alexander Simpson. "An investigation into the condition monitoring of large slow speed slew bearings." Access electronically, 2009. http://ro.uow.edu.au/theses/3035.
Full textRibadeneira, M. Xavier. "Ball bearing diagnostics with multiple sensors." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18963.
Full textBillington, Scott Alexander. "Sensor and machine condition effects in roller bearing diagnostics." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17796.
Full textSchiller, David (David Andrew) 1975. "Investigation of methods for compensating for setting problems of tapered roller bearings in dimensionally unstable bearing housings." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80023.
Full textWu, Jing. "Non-synchronous vibration due to internal radial clearance in roller bearings." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:8881/R/?func=dbin-jump-full&object_id=92376.
Full textShiroishi, Jason William. "Bearing condition diagnostics via multiple sensors using the high frequency resonance technique with adaptive line enhancer." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/17779.
Full textCampbell, Craig Maurice. "Signature analysis techniques for needle bearing defect detection." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/19539.
Full textNejeschleba, Martin. "Snižování vibrací a hlučnosti ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417744.
Full textRehab, Ibrahim A. M. "The optimization of vibration data analysis for the detection and diagnosis of incipient faults in roller bearings." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/32636/.
Full textScherb, Bruno Johannes. "Prediction and measurement of the frictional torque characteristics of radially and axially loaded radial cylindrical roller bearings." Thesis, University of South Wales, 1999. https://pure.southwales.ac.uk/en/studentthesis/prediction-and-measurement-of-the-frictional-torque-characteristics-of-radially-and-axially-loaded-radial-cylindrical-roller-bearings(be2c737c-e073-4bed-8c6d-39d4e13fd558).html.
Full textStilwell, Alex William. "An Experimental Study of Power Losses of Full-complement Needle Bearings of Planetary Gear Sets." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337360042.
Full textJordan, Ivan Keith. "The effects of the slip amplitude and lubricant type on the rate of false brinelling in roller bearings." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/21503.
Full textFalse brinelling is a wear phenomenon that occurs in stationary rolling element bearings. Vibrations from adjacent running machinery are transmitted to the stationary bearing via the machinery foundations, and result in relative motion between the rollers and the races. This results in wear scars at the point of contact between the rollers and the race. The wear scars result in premature failure of the bearings. There are a large number of parameters that affect the rate of false brinelling. Most of these parameters are not free to be altered by the user of the bearing. There are two parameters that can be altered, the type of lubricant, and the slip amplitude of the vibration. The slip amplitude can be altered by changing the stiffness of the foundation of the equipment. By varying these two parameters it should be possible to limit the amount of damage to the bearing. In the work reported here, a shaker was used to axially vibrate a flat "outer race" in a lubricant bath, against a cylindrical roller. The relative motion was measured by means of a proximity probe. Two lubricants were tested: SAE 30 oil and LGEP 2/1 grease. Two different wear mechanisms, exhibiting vastly different wear rates, were discovered for the oil tests. At low slip amplitudes, smaller than 25um, the results suggested that elastic deformation of the contacting surfaces was the means of displacement accommodation. At larger slip amplitudes the results suggested relative motion between the two contacting surfaces, which was marked by a bifurcation in the wear rate versus slip amplitude curve. The one branch of the curve, which for ease of explanation is called wear mechanism one, exhibited a low wear rate, which increased in a linear fashion with respect to the slip amplitude. The second branch of the curve, wear mechanism two, approximated a step function, with a very rapid increase in the wear rate with respect to the slip amplitude. This rapid increase is followed by a slow linear increase in the wear rate with respect to the slip amplitude.
Garg, Ayush. "Measurement of Power Losses of Rolling Element Bearings under Tightly ControlledTemperature and Loading Conditions." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587641029699076.
Full textKEHLENBACH, JOSUA. "Fault diagnosis of axlebox roller bearings of high speed rail vehicles based on empirical mode decomposition and machine learning." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299774.
Full textAxelbox lager är en av de viktigaste komponenterna i ett järnvägsfordon när det berör säkerheten. Ett axelbox lager som havererar under drift kan vara farligt for passagerarna och även dyrt för operatören. Driftfel av lagren har varit orsaken till många katastrofala olyckor. Därför är det av yttersta vikt att förutsäga lagerfel så tidigt som möjligt. Detta ökar fordonets tillförlitlighet och säkerhet samt minskar underhållskostnaderna. Mycket forskning har utförts inom övervakning av rullager. Många metoder använder komplexa algoritmer för att maximalt utnyttja matningarna. Algoritmerna saknar ofta tolkbarhet och har höga beräkningskostnader, vilket gör dem svåra att använda i ett integrerat system. Denna avhandling kombinerar era metoder för databehandling och maskininlärning till en algoritm som kan förutsäga lagerskador med hög precision, samtidigt som tolkningsförmågan bibehalls. Bland andra välkända metoder sa använder algoritmen Empirical Mode Decomposition (EMD) och Singular Value Decomposition (SVD) för att extrahera väsentlig information for vibrationsmätningarna. Algoritmen testas sedan med tre olika vibrationsdatamängder, varav en mättes specikt med tanke på simulering av axelbox lager. Ett annat mål med algoritmen är att göra den tillämpad för ytterligare mätningar. Det bör vara möjligt att inkludera mätningar av olika slag, dvs ljud- eller temperaturmätningar, och därigenom förbättra resultaten. Detta skulle minska implementeringskostnaden avsevärt eftersom befintliga sensorer används för detta ändamål. I händelsen av att de föreslagna metoderna inte fungerar med nya mätningar är det även möjligt att integrera ytterligare funktioner i algoritmen.
Šedo, Matej. "Ztráty ve valivých ložiscích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231815.
Full textМороз, С. А., В. В. Пташенчук, and С. О. Приступа. "Математичне моделювання технологічного оброблення кілець роликопідшипників." Thesis, Сумський державний університет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/48077.
Full textDostál, Martin. "Diagnostika vibrací mechanického původu v asynchronním motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220714.
Full textDítě, Jan. "Řešení dynamiky vyvažovací jednotky vznětového řadového čtyřválcového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228908.
Full textMason, Michael A. "A PRACTICAL TOOL FOR THE DETERMINATION OF SURFACE STRESSES IN RAILROAD BEARINGS WITH DIFFERENT CONTACT GEOMETRIES AND LOAD CONDITIONS USING FINITE ELEMENT ANALYSIS." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3663.
Full textDenni, Martin. "Dynamic behaviour of cylindrical roller bearing working in a centrifugal field for planetary gearbox applications." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI096.
Full textWith the constant aim of reducing the turbofan consumption, aircraft manufacturers try to reach higher efficiency by increasing the compressor-turbine speed. In order to limit the fan speed, a planetary gearbox is introduced between the fan and the compressor. Because of their good oil-off performance, roller bearings are often preferred over hydrodynamic bearings for aircraft applications. However, in the case of planetary gearboxes, the roller bearings are submitted to severe centrifugal forces which cause significant power losses and premature cage fatigue that may lead to overall bearing failure. The present work consists in the development of a numerical model for the understanding of the dynamic behaviour of a cylindrical roller bearing working in a centrifugal field. Multi-body dynamics is used, coupled with semi-analytical contact models accounting for the different lubrication regimes encountered in the bearing. In addition, a finite element model is developed to account for the outer ring flexibility that may affect the bearing dynamics. Results are presented for a typical planetary gearbox application in terms of force, speed and power losses. Severe roller/cage impacts are observed and the mechanisms that cause the high power losses and the cage fatigue are explained. The influence of the main model hypothesis is presented. Finally, a study of the influence of the different parameters on the force amplitude and the bearing loaded zone shape and position is performed
MASOTTI, PAULO H. F. "Metodologia de monitoração e diagnóstico automatizado de rolamentos utilizando lógica paraconsistente, transformada de Wavelet e processamento de sinais digitais." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11458.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Král, Martin. "Pevnostně deformační analýza uložení vyvažovacího hřídele." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231699.
Full textVotroubek, Jan. "Analýza vibračního válce s novým typem kinematiky řízení." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229420.
Full textKrajči, Jakub. "Moderní pohonná jednotka s vysokou mechanickou účinností – klikový mechanismus." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232049.
Full textDanilo, Mikić. "Modeliranje mašinskih tehničkih sistema korišćenjem transformacionih matrica." Phd thesis, Univerzitet u Novom Sadu, Tehnički fakultet Mihajlo Pupin u Zrenjaninu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=101475&source=NDLTD&language=en.
Full textThe essence of research in his doctoral dissertation is the useof a concrete mathematical model matrix phases ofdiagnostics as the choice of optimal parameters of the statemachines at work and cancellation of the constituentcomponents of mechanical systems (robot-manipulator,compressor and pumps). Also, through the matrix have beenselected maintenance of everything in order to determine thesecurity and functioning of the components of the mechanicalsystems.Final goal of model performance matrix analysis underway inof diagnostics and maintenance is to make the selection of thebest solutions and most preferably variants that will increasethe level of reliability which will affect the future process ofexploitation of machines. Give a model matrix, as well as thesoftware tools are presented as models of the calculation,diagnostics, maintenance and reliability of mechanicalsystems. The presented matrices are universal character forthe reason that can be applied both on the simple and oncomplex mechanical systems, regardless of the dimensions ofthe components of mechanical systems and their movements.
Popescu, George. "Digital Signal Processing Methods for Safety Systems Employed in Nuclear Power Industry." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479815935917872.
Full textCagaš, Radek. "Konstrukce dokončovacího stroje pro valivé elementy ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231787.
Full textSmith, Douglas H. (Douglas Hession). "Tapered roller bearing ballscrew support system." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34052.
Full textSukovatý, Adam. "Vliv frekvenčního měniče na životnost ložisek a jejich poškození." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378732.
Full textMuller, Cole. "Reliability analysis of the 4.5 roller bearing." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FMuller.pdf.
Full textThesis advisor(s): David H. Olwell, Samuel E. Buttrey. Includes bibliographical references (p. 65). Also available online.
Mynář, Josef. "Vliv frekvenčního měniče na životnost ložisek a jejich poškození." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378018.
Full textBhamidipati, Prasanna Subbarao. "FEA ANALYSIS OF NOVEL DESIGN OF CYLINDRICAL ROLLER BEARING." Cleveland State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=csu1324152802.
Full textLinares, Arregui Irene. "Mechanical behaviour of a bainitic high strength roller bearing steel." Licentiate thesis, KTH, Hållfasthetslära (Avd.), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25423.
Full textVrček, Aleks. "Micro-pitting and wear characterization for crankshaft roller bearing application." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68418.
Full textSlotkus, Arnas. "Atraminio ritinėlio konstravimas ir gamyba." Bachelor's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100907_095515-59479.
Full textIn the bachelor project designed product – „Thrust roller design and production“. Examine this area used to design options and tools, selected a number of possible design options that made the comparison. Perform basic details of the device (shaft) technical computing. Analyzed in one device parts manufacturing technological route to determinate it‘s processing operations required for the installation, the esstimated nubers. The paper presents the human and environmental safety requirements, using a work process. The economic calculations based on the product and the cost.
Gaumond, Marc-Antoine. "Konstrukce napínáku pro pilové čepele." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-451198.
Full textLinares, Arregui Irene. "Mechanical behaviour of a roller bearing steel : Strength differential effect, low temperature creep and propagation of short cracks." Doctoral thesis, KTH, Hållfasthetslära (Avd.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-163231.
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Norman, Joakim. "Equipment for bearing housing change of work rolls in a steckel mill." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183027.
Full textOutokumpu Stainless AB är verksamma inom tillverkning och utveckling av rotsfria stål. I deras varmvalsverk i Avesta finns ett behov att införa en utrustning för att enkelt byta lagerhusen på steckel valsverkets arbetsvalsar. Idag förs detta manuellt med travers, domkraft, slägga och spett. Det ger slitage på operatörer och även utrustningen kan skadas i denna process. På uppdrag av Outokumpu Stainless AB har Bilfinger startat detta projekt som ett examensarbete med målsättning att ta fram ett konstruktionsförslag för en maskin som uppfyller kraven på en smidigare och bättre hantering av lagerhusbytena. I detta arbete presenteras några koncept på hur maskinen skulle kunna fungera, några analyser av krafter som uppstår när vals och lagerhus placeras i sitt stativ, en enklare modell för att uppskatta den kraft som krävs för att ta av lagerhusen från valsen samt kraft och FEM analyser av maskinen. Resultatet blev en maskin som består av ett stativ att placera valsen med lagerhusen på samt två avtagare, en för varje lagerhus som drar med lagerhuset då den påverkas av en hydraulisk cylinder. Maskinen uppfyller alla satta krav förutom produktions pris och kraften i hydraulikcylindern då den dras in (30% lägre). En grov uppskattning av produktions och installations kostnad beräknas till lite över 1 MSEK.
Jež, Marek. "Technologie výroby plechových klecí pro axiální soudečková ložiska." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228191.
Full textKokeš, Miroslav. "Porovnání metod pro identifikaci poruch valivých ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442447.
Full textSpahic, Edin. "Piezoelectric power harvesting from mechanical strain." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86163.
Full textMachač, Stanislav. "Inovace výroby soudečků valivých ložisek objemovým tvářením za studena (OTS)." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228248.
Full textStudýnka, Pavel. "Analýza příčin zmetkovitosti při výrobě ložiskových kroužků valivých ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319256.
Full textCheng, Xiaomin. "Experimental and numerical approaches for improving rolling contact fatigue of bearing steel through enhanced compressive residual stress." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1166828432.
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