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Dissertations / Theses on the topic 'Gear wear'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Ding, Huali. "Dynamic wear models for gear systems." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1194025602.

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2

Wilkinson, Christian Marco Raymond. "The durability of highly loaded, case hardened steel gears." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/8725.

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3

Chitta, Sudeendra. "Elastohydrodynamic lubrication in spur gear and helical gear contacts." Thesis, KTH, Maskinkonstruktion (Avd.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-151246.

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The gears in a transmission are lubricated to prevent their premature failure as a result of pitting and wear on the tooth surfaces. Furthermore, the lubricant also limits the rise in surface temperature of the gears, which could otherwise lead to failure as a result of scuffing. The purpose of this thesis was to construct a fairly realistic theoretical lubrication model for spur and helical gears, the primary output parameters of this model being film thickness and flash temperatures, which would help in the identification of areas on the gear tooth surface prone to the aforementioned modes o

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4

Xinmin, Li. "Efficiency and wear properties of spur gears made of powder metallurgy materials." Doctoral thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187446.

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Powder metallurgy (PM) is usually used in manufacturing parts with complex geometries, such as gears and structural parts. The main attractions of PM are the high rate of material utilization, environmental friendliness of production, economic advantages (especially for complex geometries), and possibility of obtaining lighter components. To find a wide range of applications and compete with regular steel gears, PM gear transmissions should have good transmission efficiency and wear properties. Furthermore, they should have low contact noise and adequate surface fatigue properties. Because of

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5

Alroqi, Abdurrhman Atig. "Investigation of the heat and wear of aircraft landing gear tyres." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/68761/.

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In aircraft, the main landing gear wheels skid on the runway at the moment of touchdown because of high slip. A slipping tyre generates enough heat to melt its rubber. Melted rubber is easily eroded by the friction force between the tyre and runway; and part of eroded rubber stays on the runway, and other is burnt off as smoke. Since the early days of airplane use, a number of ideas have been patented to improve tyre safety and decrease the substantial wear and smoke during every landing by spinning the gear wheels before touchdown. In this thesis, there are three parts of research work. First

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6

Park, Daehyun. "Development of Surface Wear and Lapping Simulation Models for Hypoid Gears." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1251739728.

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7

Bergseth, Ellen. "On tribological design in gear tooth contacts." Doctoral thesis, KTH, Maskinelement, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102742.

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The correct tribological design will have a considerable effect on a gear’s service life and efficiency. The purpose of this thesis is to clarify the impact of variation in the gear tooth flank tribological system on the gear contact load capacity – to increase the understanding of how surface topography and lubricant interact. In this thesis the variation in surface topography inherent in the manufacturing method has been shown, by experimental work and computer simulations, to be an important factor for the contact condition in the early life of gears. Surface analysis revealed that the form

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8

Brauer, Jesper. "Investigation of transmisison error, friction and wear in anti-backlash involute gear transmissions." Doctoral thesis, KTH, Machine Design, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3590.

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9

Ding, Huali. "A study of interactions between dynamic behavior of gear systems and surface wear." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1194025602.

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10

Mat, Dan Reduan. "Multi-view and three-dimensional (3D) images in wear debris analysis (WDA)." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/multiview-and-threedimensional-3d-images-inwear-debris-analysis-wda(534bc7ed-ef5f-489d-b9d2-4fe89b975b61).html.

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Wear debris found in gear lubricating oil provides extremely valuable information on the nature and severity of gear faults as well as remaining gear life. The conventional off-line process of taking samples of oil for testing of wear debris is a hindrance because it is laborious, expensive, delays information collection, and is expert oriented. In view of these limitations, the development of automating wear debris particle analysis using various approaches has been ongoing for years. However, existing online technology does not encourage widespread use of wear debris analysis (WDA) in the in

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11

Domare, Emma. "Generating gear grinding : An analysis of gringing parameters's effect on gear tooth quality." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68637.

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Generating gear grinding is a method used for hard machining of gearbox gears. It facilitates a productive gear manufacturing with tight tolerances regarding surface roughness and geometrical accuracy. However, if the grinding is done with incorrect parameters, so called grinding burns can arise with consequences such as changes in surface hardness, changes in residual stress levels, surface embrittlement and compromised fatigue strength. This thesis investigates the gear tooth quality resulting from grinding parameters contributing to an improved grinding time. A literature study will cover g

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12

Liou, Joe J. "A Theoretical and Experimental Investigation of Roller and Gear Scuffing." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1273007485.

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13

Kong, Qianyin. "Calibration and Estimation of Dog Teeth Positions in Synchronizers for Minimizing Noise and Wear during Gear Shifting." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-282763.

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Electric motors are used more widely in automotive to reducing emissions in vehicles. Due to the decreased usage of internal combustion engines which used to be the main noise source, impacts from synchronizers cannot be ignored during gear shifting, not only causing noise and wear but also delaying gear shifting completion. To minimize the impacts during gear shifting, a dog teeth position sensor is required but the high calculation frequency leads to a high cost, due to the high velocity of synchronizer portions and the dog teeth number. In this thesis, the gear shifting transmission is be

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14

Hoseini, Saba. "Experimental simulation of gear hobbing through a face milling concept in CNC-machine." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-126804.

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15

Shon, Samuel. "An Experimental Study on the Impact of Various Surface Treatments on Friction, Scuffing, and Wear Characteristics of Lubricated Rolling-Sliding Contacts." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1351629351.

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16

Harpster, Steven. "A Feasibility Study on Development of Dust Abrasion Resistant Gear Concepts for Lunar Vehicle Gearboxes." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236365431.

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17

Wilson, Steve Jason. "Traction and Wear Evaluation of a Number of Plastic Materials and Greases under Combined Rolling and Sliding Contact Conditions." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337191253.

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18

Gerth, Julia Lundberg. "Tribology at the Cutting Edge : A Study of Material Transfer and Damage Mechanisms in Metal Cutting." Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183186.

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The vision of this thesis is to improve the metal cutting process, with emphasis on the cutting tool, to enable stable and economical industrial production while using expensive tools such as hobs. The aim is to increase the tribological understanding of the mechanisms operating at a cutting edge and of how these can be controlled using different tool parameters. Such understanding will facilitate the development and implementation of future, tribologically designed, cutting tools. Common wear and failure mechanisms in gear hobbing have been identified and focused studies of the material trans

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19

Hasan, Mushfiq. "Investigation of micropitting and wear in rolling/sliding contacts operating under boundary lubrication conditions." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87215.

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20

Stenudd, Joakim. "Development of method for early fault detection in small planetary gear sets in nutrunners." Thesis, Luleå tekniska universitet, Maskinelement, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83227.

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The objective of this thesis work was to develop a method to detect early damage on small planetary gear sets that are installed in Atlas Copco nutrunners. The project has gone through several stages of product development, from idea to working product and signal analysis. Currently, Atlas Copco have a test rig for testing these planetary gears, this rig has been proven to be insufficient at detecting faults during an ongoing test. A new tailored test rig was therefore designed and manufactured. Low noise and low amount of vibration was of interest when designing the rig. Four concepts was tho

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21

Lejonklo, Caroline. "Friction and wear study of lean powder metallurgy steel in a lubricated sliding contact." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-390557.

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A fairly new technology used to produce metallic components is powder metallurgy (PM). Among the advantages with this technique are decreased cost of production for complex-shaped parts, new alloys are made possible, reduced end processing, less material loss, and vibrational damping effects. The downside is the number of pores created which can alter the tribological properties of the material. The focus of this report is to investigate how lean PM steel behaves under tribological contacts. Friction and wear will be investigated using a pin-on-disc setup to mimic the sliding part of a gear t

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22

Lago, Daniel Fabiano [UNESP]. "Manutenção de redutores de velocidade pela integração das técnicas preditivas de análise de vibrações e análise de óleo lubrificante." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/94548.

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Made available in DSpace on 2014-06-11T19:27:14Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-11-13Bitstream added on 2014-06-13T19:55:36Z : No. of bitstreams: 1 lago_df_me_ilha.pdf: 2600686 bytes, checksum: 82a754d34e90e3dd82ddaab84ab68958 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Todo sistema ou equipamento mecânico está sujeito a processos de deterioração. Esta deterioração leva ao aparecimento de defeitos que podem atrapalhar a continuidade e qualidade do serviço (produção). Uma quebra não prevista traduz-se por uma parada brusca, levando ge

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23

Lagresle, Charly. "Analyse du processus d’usure abrasive et optimisation d’engrenage aéronautique." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI113.

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Les organes de transmission de puissance par engrenages sont couramment utilisés dans de nombreux domaines, parmi lesquels celui de l'aéronautique. Le système étudié dans ces travaux de thèse est un réducteur d'hélicoptère. Son rôle est de transmettre la puissance générée par le turbomoteur à la boîte de transmission principale, tout en adaptant la vitesse de rotation au besoin de cette dernière. Pour maximiser la puissance massique des systèmes, les engrenages aéronautiques peuvent être dotés de voiles minces, réduisant la masse de l'ensemble, mais favorisant aussi leurs flexibilités. Très so

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24

Lago, Daniel Fabiano. "Manutenção de redutores de velocidade pela integração das técnicas preditivas de análise de vibrações e análise de óleo lubrificante /." Ilha Solteira : [s.n.], 2007. http://hdl.handle.net/11449/94548.

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Orientador: Aparecido Carlos Gonçalves<br>Banca: Gilberto Pechoto de Melo<br>Banca: Jorge Nei Brito<br>Resumo: Todo sistema ou equipamento mecânico está sujeito a processos de deterioração. Esta deterioração leva ao aparecimento de defeitos que podem atrapalhar a continuidade e qualidade do serviço (produção). Uma quebra não prevista traduz-se por uma parada brusca, levando geralmente a grandes prejuízos e a perda de tempo de produção. Para evitar paradas inesperadas eficientemente e reduzir os custo de manutenção são utilizadas técnicas de manutenção preditiva. Entre todas as técnicas existen

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25

Flodin, Anders. "Wear of spur and helical gears." Doctoral thesis, KTH, Machine Design, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2986.

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26

Hu, Zedong. "An investigation into the wear and thermal-mechanical performance of polyacetal gears." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/99346/.

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Numerous concepts, national and commercial design standards developed and proved for metallic gears, now are being migrated over to polymer gears. However, it is uncertain whether the same procedures should apply and there is only limited data available to attempt a validation. Since wide mechanical and thermal properties’ discrepancies exist between metals and polymers, it is essential to develop and establish their individual investigation methods and science of design. The work presented in this thesis endeavours to bridge this gap between practical application and theory, through exploring

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27

Janakiraman, Venkatakrishna. "An Investigation of the Impact of Contact Parameters on the Wear Coefficient." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366906387.

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28

Natter, Bernard. "Etude de l'usure et de l'ecaillage de pieces d'un reacteur d'avion par la technique d'activation en couches superficielles." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13223.

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Utilisation de la technique d'activation en couches superficielles. Formation du radioelement cobalt 56 par reaction nucleaire. Etude du profil de concentration et mesure in situ d'usure et d'ecaillage (cas des pompes a carburant). Aspects metallurgiques. Application a l'industrie aeronautique

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29

Farré, Lladós Josep. "Novel lubrication system to improve the excessive wear in wind turbine yaw and pitch gears." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/401832.

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Manufacturers of wind turbines have observed a new phenomenon that appears in high power wind turbines: excessive wear in the teeth located at 0º in the pitch bearing. In order to design more efficient wind turbines, manufacturers are increasing the rotor diameter to capture more kinetic energy from the wind to generate more energy, therefore the stress in the joints/unions is increased, which leads to the elastic deformation of the system. These stresses and deformations increase in all parts of the wind turbine, the foundations and the tower, yaw, nacelle, drive train and blade unions. All

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30

Sosa, Mario. "Running-in of gears from a surfacetransformation and efficiency point of view." Licentiate thesis, KTH, Tribologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173828.

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Requirements today for machines have moved beyond functionality intoefficiency and reliability, gears are no exception. The presented work focuseson the analysis of the measurement, evolution and effect of running-in on geardrives from a surface roughness and efficiency point of view. With no consen-sus on a definition or observation of running-in of gear drives, measurementsof both efficiency and surface transformation during the predefined running-inis explored. A verified methodology on how to separate form, waviness androughness is presented. Two finishing methods, namely generation ground

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31

Andersson, Martin. "Churning losses and efficiency in gearboxes." Licentiate thesis, KTH, Tribologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152914.

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Efficient transmissions systems are key to producing competitive motor vehicles that have a smaller environmental impact. Gears are the main components in vehicle transmissions and although they are already highly efficient, there is still room for improvement. In this study, the focus falls on the lubricant used to create separating films between gears and todissipate heat. When driving, the gears churn this lubricant, giving rise to power losses that are related to the amount and properties of the lubricant. However, any attempt to reduce these losses must not compromise the required lubrica

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32

Jbily, Dalia. "Prise en compte de l’usure dans la modélisation du comportement sous charge des engrenages roues et vis tangentes." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI037/document.

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Les engrenages roues et vis sans fin sont une solution avantageuse pour transmettre le couple entre des axes perpendiculaires non concourants. Ces engrenages offrent une solution simple et efficace en terme de coût dans les applications de transmission de puissance, où un grand rapport de réduction est nécessaire, en comparaison avec les engrenages classiques à axes parallèles qui nécessitent normalement deux ou trois étapes pour obtenir les mêmes réductions avec une augmentation conséquente de complexité et du nombre de pièces. L’usure de surface est un des modes de défaillance observés dans

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33

Cerqueira, Pedro Aires da Cunha. "Mild wear in lubricated gear transmissions." Dissertação, 2015. https://repositorio-aberto.up.pt/handle/10216/79528.

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Cerqueira, Pedro Aires da Cunha. "Mild wear in lubricated gear transmissions." Master's thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/79528.

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35

Hammami, Maroua. "Efficiency and wear in automotive gear transmissions." Tese, 2017. https://repositorio-aberto.up.pt/handle/10216/111956.

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36

"Aspects of wear in a gear system." Thesis, 2012. http://hdl.handle.net/10210/5464.

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M.Ing.<br>The study was initiated by the inquiry from an oil company to scientifically determine the wear rate of the draglines gears. The main aim of the study was to establish an applicable practical means of measuring the amount of wear on gear tooth surfaces and to eventually integrate this metrology approach with finite element methodology for use in a maintenance strategy. Various methods found in the literature were reviewed. Due to the fact that the gears would only be available for periods when the draglines are serviced, the mould between two of the gear teeth seemed to be an appropr

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37

Hammami, Maroua. "Efficiency and wear in automotive gear transmissions." Doctoral thesis, 2017. https://repositorio-aberto.up.pt/handle/10216/111956.

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38

Brandão, José Augusto de Sousa Ferreira. "Gear tooth flank damage prediction using high-cycle fatigue and wear models." Tese, 2013. https://repositorio-aberto.up.pt/handle/10216/75489.

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39

Brandão, José Augusto de Sousa Ferreira. "Gear tooth flank damage prediction using high-cycle fatigue and wear models." Doctoral thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/75489.

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40

Ribas, Carlos José Gonçalves. "Influence of geometry, surface roughness, operating conditions on mild wear in lubricated gear transmissions." Dissertação, 2016. https://repositorio-aberto.up.pt/handle/10216/86182.

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41

Ribas, Carlos José Gonçalves. "Influence of geometry, surface roughness, operating conditions on mild wear in lubricated gear transmissions." Master's thesis, 2016. https://hdl.handle.net/10216/86182.

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42

Lin, Ah-Der, and 林阿德. "The Interaction between the Tooth Wear and the Dynamic Loads in a Spur Gear Pair." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/84649464342881135785.

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博士<br>國立中山大學<br>機械工程學系研究所<br>89<br>Abstract The interaction among the tooth wear, dynamic loads, and its corresponding frequency spectrum variation in a spur gear pair is investigated in the dissertation. A mathematical model for the dynamic responses of a profile shifting involute gear pair is derived. For simplicity, a two-step mesh stiffness model is proposed to approximate the load sharing and the time-varying stiffness effects in a mating gear pair. The analytic solutions for the dynamic responses of this simplified dynamic model are derived in both time and frequency domains. The effect

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43

Marinho, Albano Manuel Gonçalves. "Wear and friction torque in thrust ball and roller bearings lubricated with "windmill gear oils"." Dissertação, 2011. http://hdl.handle.net/10216/61346.

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Marinho, Albano Manuel Gonçalves. "Wear and friction torque in thrust ball and roller bearings lubricated with "windmill gear oils"." Master's thesis, 2011. http://hdl.handle.net/10216/61346.

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45

Tai, Sheng, and 吳聖泰. "Developing a novel four-ball wear tester and its application to study the relationship between viscosity and antiwear ability for gear oils." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/73815651381924421745.

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碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>101<br>In the four-ball test, an optical microscopy is used to gauge the diameters of the wear spots on the three SUJ2 balls, and the friction coefficient is determined by the torque measurement; as for the linear reciprocal tests, two groups of materials are adopted: SUJ2 ball vs. S45C plate and SUS304 ball vs TiCN coating. In the former test, the degree of wear is evaluated by the sectional area of the scratched profile, detected by the white-light interference meter; while for the later, the ability of the level of wear is represented by the weight loss of the

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46

CHEN, YI-MING, and 陳怡銘. "Research and Test on Wear of Spur Gears and Helical Gears." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/994jh6.

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碩士<br>龍華科技大學<br>機械工程系碩士班<br>106<br>This paper is mainly to study and test wear and accuracy of gear tooth surface of spur gear group and helical gear group after generation of operational wear. The wear of gears usually occurs under long operating time and high load. In this study, two planetary reducers of experiment groups A and B and two planetary reducers of control groups C and D were used to carry out comparison. Under the circumstances of same frame diameter and same specific speed, this study designed and manufactured the spur gear planetary reducers and helical gear planetary reducers

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47

Кучин, С. Г., та S. G. Kuchin. "Повышение точности формообразующих перемещений при высокоскоростном точении : магистерская диссертация". Master's thesis, 2016. http://hdl.handle.net/10995/41093.

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Цель работы – разработка новых технических средств повышения точности формообразующих перемещении металлорежущих станков при высокоскоростном точении. Проведен анализ погрешностей влияющих на точность формообразующих перемещений станка при высокоскоростном точении, анализ существующих способов компенсации погрешностей. На его основе разработаны устройство согласования формообразующих перемещений рабочих органов станков, устройство для компенсации износа направляющих и инструмента металлорежущего станка, устройство компенсации износа элементов металлорежущего станка. Данные устройства точнее с

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48

Cariaga, Joselito D. "A predictive procedure for wear, pitting, and scoring of gears based on combined thermal and mechanical stresses." 1997. http://catalog.hathitrust.org/api/volumes/oclc/39286962.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1997.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 325-336).

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