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Dissertations / Theses on the topic 'Gear transmissions'

Author: Grafiati

Published: 16 November 2024

Last updated: 25 July 2025

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1

Sainte-Marie, Nina. "A transmission-error-based gear dynamic model : Applications to single- and multi-mesh transmissions." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI133/document.

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Les spectres de bruit mesurés en cabine d’hélicoptère montrent que la boîte de transmission principale (BTP) est un des principaux contributeurs au bruit perçu par les usagers. Elle génère en effet plusieurs raies émergeant fortement du bruit large bande et dont les fréquences se situent dans la plage de sensibilité maximale de l’oreille humaine. Dans un contexte d’amélioration permanente du confort acoustique des usagers, un modèle numérique est développé pour prédire le comportement dynamique des BTP. Les équations du mouvement sont écrites sur la base de fonctions du temps représentatives d

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2

Janakiraman, Venkatakrishna. "Modelling of Steady-State and Transient Power Losses in Planetary Gear Trains." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492510708602145.

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3

Kurth, Franz [Verfasser]. "Efficiency Determination and Synthesis of Complex-Compound Planetary Gear Transmissions / Franz Kurth." München : Verlag Dr. Hut, 2012. http://d-nb.info/1029400172/34.

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4

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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5

Brethee, Khaldoon F. "Condition monitoring of helical gear transmissions based on vibration modelling and signal processing." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34519/.

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Condition monitoring (CM) of gear transmission has attracted extensive research in recent years. In particular, the detection and diagnosis of its faults in their early stages to minimise cost by maximising time available for planned maintenance and giving greater opportunity for avoiding a system breakdown. However, the diagnostic results obtained from monitored signals are often unsatisfactory because mainstream technologies using vibration response do not sufficiently account for the effect of friction and lubrication. To develop a more advanced and accurate diagnosis, this research has foc

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6

Fargere, Romain. "Simulation du comportement dynamique des transmissions par engrenages sur paliers hydrodynamiques." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0130/document.

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Ce travail vise à prédire le comportement dynamique de transmissions par engrenages supportées par des paliers hydrodynamiques, semblables à celles utilisées dans le domaine de la propulsion navale. Un modèle couplé de transmission mécanique est présenté ; il traite la plupart des interactions possibles entre les engrenages, les arbres et les paliers. Un élément d’engrenages à dentures larges, avec raideur non linéaire et dépendante du temps, est combiné à des éléments finis de poutre alors que la contribution des paliers est introduite par la résolution directe de l’équation de REYNOLDS et d’

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7

White, Robert J. "Exploration of a Strategy for Reducing Gear Noise in Planetary Transmissions and Evaluation of Laser Vibrometry as a Means for Measuring Transmission Error." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1129928063.

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8

Larsson, Camilla. "Reduction of oil pump losses in automatic transmissions." Thesis, Linköpings universitet, Fordonssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-111937.

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In the vehicle industry it is of great interest to reduce the emissions and lower the fuel consumption.Up to now a lot of effort has been put into increasing the efficiency of the engine,but it starts to get expensive to keep improving the engine. In this master thesis the transmissionand especially the oil supply to the transmission is investigated. An example of how the requirements of an oil pump can be decided is described. Knowingthe requirements different pumps may be adapted to meet the demands. The gear pumpused today is compared with a variable displacement pump and an electric pump.

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9

Vinayak, Harsh. "Multi-body Dynamics and Modal Analysis Approaches for Multi-mesh Transmissions with Compliant Gear Bodies." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392059093.

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10

Terrin, Andrea. "Analysis and design against pitting of gears in power transmissions for off-highway vehicles." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3426672.

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The work described in this thesis has been developed within the scope of a higher education apprenticeship program in cooperation with Carraro S.p.A., global player in the market of power drivelines for vehicles employed in industrial and agricultural applications, also addressed as off-highway vehicles. The study is aimed to the analysis of the mechanisms leading to contact fatigue failures of gears and to the development of reliable and efficient methods to characterize gears materials. Pitting is the most hazardous among rolling contact fatigue phenomena occurring in gears. It manifests wit

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11

Feki, Nabih. "Modélisation électro-mécanique de transmissions par engrenages : Applications à la détection et au suivi des avaries." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00743722.

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La détection et le diagnostic des défauts d'engrenages ont été traditionnellement basés sur l'analyse des signaux vibratoires et acoustiques. Mais, ces méthodes peuvent être coûteuses suite aux difficultés techniques de mise en œuvre de capteurs sur des pièces en rotation. Dans ces travaux de thèse, une méthode originale de détection de défauts locaux dans des engrenages entraînés par des moteurs électriques est proposée en se basant sur le suivi des courants statoriques. Le système électromécanique est simulé numériquement en combinant un modèle électrique dynamique de moteurs asynchrones (mo

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12

Kurth, Franz [Verfasser], Bernd-Robert [Akademischer Betreuer] Höhn, Ahmet [Akademischer Betreuer] Kahraman, and Karsten [Akademischer Betreuer] Stahl. "Efficiency Determination and Synthesis of Complex-Compound Planetary Gear Transmissions / Franz Kurth. Gutachter: Ahmet Kahraman ; Karsten Stahl ; Bernd-Robert Höhn. Betreuer: Bernd-Robert Höhn." München : Universitätsbibliothek der TU München, 2012. http://d-nb.info/103340313X/34.

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13

Chevrel-Fraux, Cyril. "Modélisation de transmissions de forte puissance : Prise en compte d'amortissements variables." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI008.

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Travaux de thèse sont issus d’une collaboration entre la société Naval Group (anciennement DCNS) et le laboratoire du LaMCoS de l’INSA de Lyon. Dans le milieu de la propulsion navale, les transmissions par engrenages qui assurent le lien entre le moteur et l’hélice, transmettent des couples importants. Pour transmettre ces couples, les mobiles peuvent avoir de grandes dimensions (plus de deux mètres de diamètre). Pour des raisons de gains de masse, des trous ou des cavités sont généralement introduits dans le corps de la roue. L’ajout de ces alésages réduit sa masse mais augmente également sa

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14

Hilty, Devin R. "An Experimental Investigation of Spin Power Losses of Planetary Gear Sets." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276270638.

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15

Liauwnardi, Leonard. "Plastic gear transmission error measurements and predeictions." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407243719.

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16

Fish, Michael Anderson. "Transmission errors in precision worm gear drives." Thesis, University of Huddersfield, 1998. http://eprints.hud.ac.uk/id/eprint/4851/.

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Transmission error is a measure of the positioning accuracy of a gear system. This has been widely documented in gearing for many years as the source of problems in noise and vibration. It is a result of errors in the contact conditions which affect the driven gear with respect to the rotation of the driver gear. This research aims to present a better understanding of the basic kinematics of worm gear systems by identifying the significant influences which determine the contact conditions. A literature review of existing theory is described which determines the major areas considered in worm g

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17

Anichowski, Brian Jr. "An Experimental Investigation of the Effect of Spacing Errors on the Loaded Transmission Error of Spur Gear Pairs." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492619887370311.

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18

Košík, Matej. "Koncepční návrh převodového ústrojí pro užití v elektromobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444969.

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This diploma thesis deals with designing electric vehicle gearbox. Gearbox should serve as virtual replacement for actual transmission of VW ID.3 EV. Designed gearbox has two gears. In the first section there is an extensive search processed of drivetrain and transmission of battery electric vehicles. Next section contains choice of transmission concept and analyses solving of individual structural nodes – gear wheels, band breaks (components that engage individual gears), carriers, shaft, bearing. In the conclusion of diploma thesis, the two-gear planetary transmission is evaluated.

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19

Chapron, Matthieu. "Comportement dynamique de train planétaire / épicycloïdal avec erreurs d’assemblage, écarts de forme et structures déformables : Optimisation des corrections de dentures." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI040/document.

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Ces travaux de thèse sont le fruit de la collaboration entre la société Hispano-Suiza et le LaMCoS de l’INSA de Lyon. Dans le cadre du développement de nouveaux systèmes de propulsion, l’implantation d’un train planétaire / épicycloïdal entre la turbine et l’hélice semble être une voie intéressante pour atteindre les performances souhaitées en terme de rendement. L’augmentation des puissances transmises et la réduction des masses embarquées dans les applications aéronautiques tendent à rendre les composants de plus en plus déformables. Lors de ces travaux de recherche, un modèle dynamique de t

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20

Mehdi, Pour Reza. "Transmission DynamicsModelling : Gear Whine Simulation Using AVL Excite." Thesis, KTH, Fordonsdynamik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-243090.

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Nowadays, increasing pressure from legislation and customer demands in the automotive industry are forcing manufacturers to produce greener vehicles with lower emissions and fuel consumption.As a result, electrified and hybrid vehicles are a growing popular alternative to traditional internal combustion engines (ICE). The noise from an electric vehicle comes mainly from contact between tyres and road, wind resistance and driveline. The noise emitted from the driveline is for the mostpart related to the gearbox. When developing a driveline, it is a factor of importance to estimate the noise rad

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21

Boguski, Brian C. "An Experimental Investigation of the System-Level Behavior of Planetary Gear Sets." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291009879.

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22

Mehdi, Pour Reza. "Transmission Dynamics Modelling : Gear Whine Simulation Using AVL Excite." Thesis, KTH, Fordonsdesign, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234817.

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Nowadays, increasing pressure from legislation and customer demands in the automotive industryare forcing manufacturers to produce greener vehicles with lower emissions and fuel consumption.As a result, electrified and hybrid vehicles are a growing popular alternative to traditional internalcombustion engines (ICE). The noise from an electric vehicle comes mainly from contact betweentyres and road, wind resistance and driveline. The noise emitted from the driveline is for the mostpart related to the gearbox. When developing a driveline, it is a factor of importance to estimatethe noise radiati

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23

Wang, Hong. "MACHINE HEALTH MONITORING OF ROTOR-BEARING-GEAR TRANSMISSION SYSTEM." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133281063.

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24

Alshahrany, Shaya. "Rolling contact fatigue in heavily loaded gear transmission contacts." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/90422/.

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This thesis examines the influence of asperities such as found on the teeth of gears and discs, and failure mechanisms associated with rough surface Elastohydrodynamic Lubrication (EHL). The principal outcomes of the research provide a good insight into fatigue life, residual stress effects, damage prediction and surface contact failures. In particular, the study is intended to provide understanding into the residual stress distribution resulting from plastic deformation of surface asperities in the running in process. The residual stress is then added to the asperity elastic stress distributi

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25

Fakhfakh, Hassen. "Etude du comportement dynamique d’un système multi-étages à engrènements en cascade et décalés à dentures droites et hélicoïdales - Optimisation des corrections de profil." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI071/document.

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Ce travail de thèse, réalisé dans le cadre d’une collaboration avec la société Hispano-Suiza (groupe SAFRAN) porte sur la modélisation et l’analyse des vibrations et surcharges dynamiques sur les engrènements d’un réducteur aéronautique multi-étage constitué de plusieurs cascades d’engrènements situés dans des plans décalés. Une modélisation originale est proposée qui repose sur le couplage entre la résolution des équations du mouvement et la prise en compte des conditions de contact instantanées sur l’ensemble de tous les engrènements. Le modèle gère les phases relatives entre engrènements ai

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26

Karmi, Bilel. "Fiabilité et optimisation des systèmes mécaniques : applications aux éoliennes." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH12.

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Le comportement dynamique des systèmes mécaniques est crucial dans l'industrie pour éviter l'instabilité et les vibrations, assurant ainsi la fiabilité et la durabilité des équipements. La complexité et les incertitudes inhérentes rendent la modélisation précise difficile, mais intégrer ces incertitudes est essentiel pour renforcer la robustesse des systèmes. Des approches comme la simulation de Monte Carlo sont utilisées pour tenir compte de ces incertitudes, notamment dans des domaines spécifiques comme les transmissions par engrenage, où les paramètres incertains peuvent avoir un impact sig

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27

Bagge, Mats. "An approach for systematic process planning of gear transmission parts." Licentiate thesis, KTH, Production Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9942.

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<p>The objective of this thesis is to find and develop methods that enhance and support the creation of evolvable master process plans with possibilities to challenge productivity and meet changing design requirements. The condition for achieving this is primarily that both the fundamental thinking and the results behind a process plan can be described. How should this be done?</p><p>The focus is laid on process planning of gear transmission parts for heavy vehicles like trucks and coaches.</p><p>Process planning is the activity where design and manufacturing are brought together with the comm

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28

Tangasawi, Osman A. M. "Combined numerical and experimental investigation of transmission idle gear rattle." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/16553.

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Gear rattle is caused by engine torsional vibration (engine order response) imparted to the transmission components, further causing the gears to oscillate within their functional backlashes. These oscillations lead to the repetitive impact of gear teeth, which lead to noisy responses, referred to as gear rattle. The lack of in-depth research into the effect of lubricant on gear rattle has been identified as a deficiency in the previous research in rattle. The aim ofthe current work is to address this shortcoming. The thesis outlines a new approach in investigating the problem of idle gear rat

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29

Sweeney, Katelyn (Katelyn M. ). "Development of a gear shift test setup for hybrid transmission vehicles." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119935.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 39-40).<br>As fuel and efficiency regulations tighten, precise and highly efficient transmission systems are becoming necessities. Previous studies at the MIT Global Engineering and Research (GEAR) Laboratory demonstrated mathematically the ability to improve the shift event via Hall Effect sensing; this study sought to implement those results in practice. To accomplish this, measurements of the physical gearsets

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30

Tuttle, Timothy Douglas. "Understanding and modeling the behavior of a harmonic drive gear transmission." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12789.

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31

Kwon, Hyun Sik. "Development of Automated Design Tools for Automotive Automatic Transmission Gear System." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1370019857.

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32

Öun, Martin. "Automatic Transmission Power Flow Matrix Representation." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157471.

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The project has worked with the function and structure of epicyclical automatic transmissions. The goal of the project has been to find a mathematical way of representing the transmissions setup and possible power flows. Furthermore the project has included the generation of all theoretically possible matrix representations of two simple planetary gear sets in MATLAB as the base for a future optimization model. The result of the project is a large quantity of matrix representations of the two planetary gear sets and their connections and shafts. The result from the MATLAB program has been veri

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33

Milliren, Mark R. "AN EXPERIMENTAL INVESTIGATION INTO THE INFLUENCE OF VARIOUS ERRORS ON THE TRANSMISSION ERROR AND ROOT STRESSES OF SPUR GEARS." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1314209495.

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34

Haupt, Brandon Levi. "Design and Analysis of a Positively Engaged Continuously Variable Transmission." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2635.pdf.

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35

Janzen, Isaiah. "Modeling of Heat Treating Processes for Transmission Gears." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-theses/1123.

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"The effects of heat treating process parameters on the microstructure, residual stress, and distortion of a vacuum carburized, quenched and cold treated ring gear made of Pyrowear 53 has been determined using Abaqus and DANTE software. The data from these finite element method simulations was compared to measured values from physical testing. It was found that the heat treating process of the ring gear could be simulated and provide similar results to the measured and specified values for hardness, carbon content, and distortion. The simulations and distortion in this paper provide a detaile

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36

Li, Zheng. "Spur gear teeth contact analysis on power-train transmission noise, vibration and harshness." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/3163/.

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The gear meshing is very complex process as high non-linearity behaviour is involved during the process. Normally most analysis of gear tooth contact is on the basis of a hypothesis that the contacted gear teeth are cantilever beams to obtain the approximate results quickly. However, many important factors have been ignored in simulating gear tooth contact using cantilever beam hypothesis, those factors include tooth profile variations, gear rotation speed and input torque, coefficient of friction and geometry distortion. Many of non-linear responses such as noise, vibration, abrasion and so o

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37

DESAI, KAUSHIK. "Oil Churning losses in Automatic Transmission." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141768.

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Lately the discussion on how big impact vehicles has on the environment has grown bigger and bigger. The vehicle manufacturers are building cars, trucks, and wheel loaders etc. that are getting more and more fuel efficient for every year. But where do the engineers at the companies make the improvements? The drive train is one area of the vehicle where many different sources of losses are found. The gearbox is one example, where the losses are both dependent and independent on the torque transferred by the gear pairs. The gearbox consists of several components that all of them contribute to th

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38

Henriksson, Mats. "On Noise Generation and Dynamic Transmission Error of Gears." Doctoral thesis, KTH, Farkost och flyg, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11858.

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Noise from heavy trucks is an important environmental issue. Several sources contribute to the total noise level of a vehicle, such as the engine, gearbox, tires, etc. The tonal noise from the gearbox can be very disturbing for the driver, even if the noise level from the gearbox is lower than the total noise level. The human ear has a remarkable way of detecting pure tones of which the noise from loaded gears consists of. To be allowed to sell a heavy truck within the European Union, the so called pass-by noise test must be completed successfully. The maximum noise level permitted is 80dB(A)

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39

LIN, PO-YUAN, and 林伯原. "Research of Hypocycloidal Gear Transmissions." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4j957s.

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碩士<br>吳鳳科技大學<br>光機電暨材料研究所<br>106<br>The objective of this research is to push the Electro-Mechanical (EM) actuator technology forward and make it capable of meeting increasingly demanding requirements by improving gear transmission technology which has the most significant effects on actuator performance. The research presents in-depth parametric design and analysis of the Hypocycloidal Gear Transmission (HGT). Careful parametric design of the tooth profile and its tip relief can further enhance the performance of the HGT by dramatically improving the Hertz contact property, and maximizing the

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40

Dun-Wei, Su. "Configuration Synthesis of Epicyclic Gear Transmissions." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2107200514235400.

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41

Park, Sang-Hyun. "Fundamental development of hypocycloidal gear transmissions." Thesis, 2005. http://hdl.handle.net/2152/2334.

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Su, Dun-Wei, and 蘇敦偉. "Configuration Synthesis of Epicyclic Gear Transmissions." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/51100834745616820200.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>93<br>A systematic designing procedure to determine the gearing configuration arrangement of epicyclic gear transmissions for given speed ratios is presented. Vertices with symmetric dependency can be chosen from links by topological characteristics. Typical mode sets which are simplified from numerous modes can be established by substituting the symmetric dependency. By identifying the distribution of links, modes can be classified into different types of gain by sketching Kinematic Flow Diagram. In order to find the relations between each mode, the description of

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43

Chien-Hong, Lai, and 賴建宏. "Design of Four-Speed Gear Transmissions." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/63053326108766400235.

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碩士<br>國立中山大學<br>機械工程研究所<br>86<br>Gear transmission provides higher performance of power transport and it is widely applied in motorcycle. There are many types of gear transmission. The four-speed gear transmission is most common used for it's proper arrangements of speed ratio and easy to operate. In this thesis, the four-speed gear trans-lation in motorcycle is taken to establish the system's function diagram and related design methodology. These tasks are used to build a transmission with simple structure and smooth variation when changing the speed. At first, this thesis will introduce

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44

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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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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46

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

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47

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

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48

HSIAO, HUNG-TA, and 蕭宏達. "Computer-Aided Engineering Analysis of Hypocycloidal Gear Transmissions." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/nf6cgb.

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碩士<br>吳鳳科技大學<br>光機電暨材料研究所<br>106<br>The objective of this research is to push the Electro-Mechanical (EM) actuator technology forward and make it capable of meeting increasingly demanding requirements by improving gear transmission technology which has the most significant effects on actuator performance. The research presents computer-aided design and analysis of the Hypocycloidal Gear Transmission (HGT). Careful design of the curtate cycloid tooth profile can further enhance the performance of the HGT by dramatically improving the Hertz contact property. This high contact ratio leads to idea

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49

Lin, Yuh Long, and 林玉龍. "Kinematic Structure of Planetary Gear Trains for Automatic Transmissions." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/78691878565895793617.

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碩士<br>國立中山大學<br>機械工程研究所<br>82<br>Automatic transmission is one of the most important equipments in automobile. The purpose of this work is to propose the a systematic methodology for the synthesis and analysis of the kinematic structure of transmission mechanisms. First, the functions and characteristics of transmission mechanism are clarified. The graph representation and adjacency matrix are used to present the kinematic structure of transmission mechanisms. Then, b

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Tsai, Chin-Chin, and 蔡錦津. "Design of Lepelletier Epicyclic Gear Mechanisms for Automobile Transmissions." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/67699838458992595583.

Full text

Abstract:

碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>99<br>An epicyclic gear mechanism for automobile transmissions is a device which is connected from engine to driving wheels, and the main purpose is to maintain the revolution speed of engine to be in a desired working range while accelerating or decelerating the automobile. The epicyclic gear mechanisms for automobile transmissions in production are mostly Ravigneaux-type, Parallel-connected type and Lepelletier epicyclic mechanisms, and the Lepelletier epicyclic gear mechanisms is a device which is connected with a simple epicyclic gear mechanism besides the i

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