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1
Wu, Xionghua. "Vibration of Planetary Gears Having an Elastic Continuum Ring Gear." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276524893.
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Ericson, Tristan Martin. "Experimental Study of Planetary Gear Dynamics." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354212365.
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Wang, Zhongwei. "Dynamic modelling of planetary gear systems for gear tooth fault." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/1284.
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Geared systems have been widely used in mechanical applications for more than a hundred years. A large range of literature has been published especially for spur/helical gear systems and the investigations into technical areas of spur/helical gears have been very well developed, including understanding of condition monitoring systems, diagnostic and prognostic methods. However, there is a lack of understanding on the general dynamic behavior of planetary gear systems with tooth faults. Planetary gears are normally used as effective power transmission elements with high power to weight/volume ratios, large speed reductions in compact volume, and high reliability. They tend to have high efficiency and are used in many applications, such as automotive, heavy truck/tractor, helicopter, wind turbines and bucket wheel reclaimer gearboxes.The purpose of this research is to develop a vibration analysis system that simulates dynamic behavior of large low speed, high torque planetary spur gear systems such as used in bucket wheel reclaimer and wind turbine gearboxes, with and without gear element faults. This thesis investigates lumped mass modelling methods for planetary gearbox dynamic behavior based on previous gearbox modelling research including the use of the coupled torsional-transverse behavior of the gear body. The dynamic model of the planetary spur gear system includes effects such as: variable tooth mesh stiffness, dynamic transmission error effects, and pitch and profile excitation for gear fault detection purposes. Different tooth faults are simulated using the concept of combined torsional mesh stiffness. The dynamics of spur planetary gear systems with and without tooth faults are compared and analyzed to improve the understanding of fault detection in the present gear systems.Dynamic modelling of gear systems, such as outlined in this thesis can assist in understanding the consequence of large transient events, including the fluctuations in tooth loads which can reduce gear fatigue life and lead to further tooth damage. Early detection of faults on gear teeth can be used to initiate maintenance actions in order to reduce repair work and avoid catastrophic breakdown.
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Lin, Jian. "Analytical investigation of planetary gear dynamics /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488203552779634.
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Ligata, Haris. "Impact of system-level factors on planetary gear set behavior." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1172599656.
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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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Guo, Yichao. "Analytical Study On Compound Planetary Gear Dynamics." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1312289370.
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Eritenel, Tugan. "Three-Dimensional Nonlinear Dynamics and Vibration Reduction of Gear Pairs and Planetary Gears." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1298651902.
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Deake, Jeremy J. "Volume optimization of a simple planetary gear set." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1591595.
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This thesis describes a custom algorithm developed to optimize a simple planetary gear set. The optimization minimizes volume for one simple planetary gear set using American Gear Manufacturers Association stress equations, custom design constraints, and material constraints. Through predetermined reactions to adjustments, component features and planetary variables are modified systematically to obtain the target solution. This thesis demonstrates that the defined approach is an effective means of balancing all three components of a simple planetary gear set, thus resulting in a solution that has been optimized for volume.
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Jonsson, Martin. "Planetary Gear Analysis : deformation induced misalignment and optimization." Thesis, KTH, Maskinkonstruktion (Inst.), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276682.
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A handheld heavy-duty nut runner, commonly used to assemble windmills and oil pipe lines, and capable of producing 4100 Nm of torque, experiences low cycle fatigue and usually fails after 20 000 cycles at the specified torque. A full assembly Finite element model of the last stage of the four-stage planetary gearbox is constructed and simulated over one complete load cycle. The results from the simulation is compared with, and used to verify a KISSsoft simulation of the same model. Using the Finite Element model, a parametric optimization is performed using a full factorial design. The results show that misalignment issues are difficult to prevent due to the planetary gearbox design. Comparing the two models shows similar characteristics and stress levels but that local differences are common. A proposed design improvement results in better load distribution in the planet – ring interaction, which was previously impaired compared to the planet – sun interaction due to deformation induced misalignment. The result shows that by balancing the rotational stiffness of the side 1 and side 2 carrier pin mountings, it is possible to reduce the contact misalignment and improve the load distribution in the gearbox.En handhållen mutterdragare vars användningsområde innefattar bland annat montering av vindkraftverk och oljeledningar, producerar ett vridmoment om 4100 Nm. På grund av det här havererar vanligtvis verktyget av utmattning vid ca 20 000 cykler, något som tros vara kopplat till vinkelfel som uppkommer vid deformation av verktygets växellåda. Vinkelfelen resulterar i att lastfördelningen mellan kugghjulen blir skev och spänningskoncentrationer uppstår. Finita elementmetoden används för att undersöka uppkomsten av vinkelfelen och en komplett modell av hela det sista steget i den fyrstegade planetväxellådan undersöks. Simuleringen jämförs med en liknande modell i KISSsoft, dels för att bekräfta resultatet från simuleringen, dels för att undersöka skillnader och svagheter i de båda modellerna. FE-modellen används även för att bygga upp en parametrisk optimering baserat på faktoriell design. Resultatet visar att vinkelfel är svårt att motverka på grund av växellådans design och konfiguration. Jämförelsen av de två simuleringsmodellerna uppvisar liknande karaktärsdrag och spänningsnivåer men att lokala skillnader finns mellan de båda modellerna. Optimeringen resulterar i en föreslagen designförändring som visar sig förbättra lastfördelningen i planet – ring – interaktionen utan att påverka lastfördelningen i planet – sol – interaktionen. Det här är att föredra eftersom lastfördelningen mellan planet och sol är bättre än lastfördelningen mellan planet och ring. Resultatet visar också att det är möjligt att minimera vinkelfelet mellan kontaktytorna, och förbättra lastfördelningen i växellådan genom att balansera rotationsstyvheten på var sida om planeten i planetbäraren.
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Sondkar, Prashant B. "Dynamic Modeling of Double-Helical Planetary Gear Sets." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338481548.
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Hu, Yong Hu. "A LOAD DISTRIBUTION MODEL OF PLANETARY GEAR SETS." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1511791020210108.
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Bajer, Andrzej. "Parallel finite element simulator of planetary gear trains." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3032969.
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Qin, Xiaohao, and Jiahao Cheng. "Dynamic simulation of a planetary gear for robots." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85627.
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Gear drives are widely applied in mechanical transmission systems and very accurate transmission systems are needed. In the robot industry, the planetary gear train (PGT) is commonly used to promote the torque transmission. One of the advantages of an ideal PGT is that the incoming torque is divided equally among the planet gear wheels. However, different manufacturing and assembling deviations may cause uneven load distributions. This is a serious problem that affects the load capacity and the stability of the torque transmission.SwePart has designed and patented a planetary gear blazing for very high-accuracy robots and zero gaps in the gear maintained during its operating time [25]. The purpose of this project is to determine how deviations such as pitch deviation and stiffness affect the magnitude of the contact forces acting on gear teeth from the ideal geometry.In order to model the ideal geometry, an inspection of the SwePart’s gears was needed. By using SOLIDWORKS, the common normal line which is perpendicular to the teeth profiles can be defined. This means that the base circle which is tangential to that common normal line can also be found.The gear profiles of the PGTs in this study were created using the software MATLAB based on the parametric equation of involute of the base circle. The data generated by MATLAB were then used to create 3D models of the PGTs in SOLIDWORKS. The gears were split into 2N+1 parts if the number of teeth is N, since different magnitude of the pitch deviations needs to be studied. It is more informative to compare the magnitude of contact forces acting on each half tooth.When the gears which are similar to the SwePart’s gears were finished, the x_t document was exported from SOLIDWORKS and imported into MSC_ADAMS to make the simulations. After that the materials were defined in the model and contact forces were added between teeth of the planetary gear and the ring gear. The magnitude of the contact forces acting on the rigid and flexible gear teeth were then compared. So, MSC_ADAMS needs to be used to mesh the rigid bodies to the flexible ones automatically by calling MSC_Nastran.MATLAB was used to compare the results and graphs from different ADAMS models.
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Sawatzky, Rene. "Vibration Based Planetary Gear Analysis and Damage Detection." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1378.
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With this thesis the research at the engineering department is continued, based on previous thesis projects. These projects were considering the possibility of simulation gears with rigid bodies. After researches with different emphasizes on the rigid body simulation, the gained knowledge showed limitations of the rigid body model. Gear failures are very diverse and the actual simulation technique could not represent all necessary failure modes that can occur. That led to this thesis as a research project to find a way to detect and analyze the failure modes that cannot be considered with the current rigid body approach. With the flexible body theory and simulation tools (MSC:Adams) this gap of gear failure detection simulation can be closed. The objective is, making it possible to simulate all failure modes of a gear that can occur. Additionally the previous project on this topic were using gears of small laboratory conditions. An industry sector has been picked to work on a practical application. This application is a wind turbine gearbox. These gearboxes have common run-time errors which influences the profitability of the power generation. To model this system a gear design guide for wind turbine gearboxes is elaborated.
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Xue, Song. "An investigation of gear meshing behaviour of planetary gear systems for improved fault diagnosis." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/141.
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This research has presented gear dynamic models and associated simulations to improve gear fault detection. These models include the use of finite element and lumped parameter methods for both fixed axis and planetary gear systems. The findings in this research provide an improved understanding of the gear fault mechanism and advance the gear fault detection capability of the whole drive train system. It also suggests further effective ways of monitoring the whole gear train system.
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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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Fair, Chad. "Synchronous Sampling Sideband Orders from Helical Planetary Gear Sets." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36923.
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The sideband phenomenon is a common but obscure characteristic of the Rotary Dynamics field. In the automotive industry these sidebands have been found to produce a poor sound quality, resulting in customer dissatisfaction and warranty returns. In the interest of continued product improvement, research and development must resolve uncertainties in the current design methods. Qualitative relationships between the sideband characteristics and design parameters have developed in recent years, but the quantitative goal hasn't been achieved.
A Synchronous Sampling (SS) data acquisition system is applied to a helical planetary gear set to improve the understanding of the sideband characteristics and enhance the design process. An optical encoder, a component of the SS system, mechanically locked to the rotating system controls the A/D converter to sample at constant shaft angle increments. The phase-locked nature of SS allows the use of vector averaging to significantly lower the noise floor and improve the representation of the order domain.
In this work, the advantages of using a SS system with vector averaging capabilities are compared to the disadvantages of using a fixed sampling (FS) system. Utilizing the SS tool, this work also illustrates the influences of loading styles and values and speed on a gearmesh and its dominant sideband orders. Inspection of these influences suggests an opportunity for future work.Master of Science
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Dharap, Gaurang Satish. "A Method for Systematic Design of Planetary Gear Meshes." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586883501891193.
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Banerjee, Anindo. "A Model to Predict Sun Gear Radial Orbit of a Planetary Gear Set having Manufacturing Errors." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1344872497.
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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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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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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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Inalpolat, Murat. "A THEORETICAL AND EXPERIMENTAL INVESTIGATION OF MODULATION SIDEBANDS OF PLANETARY GEAR SETS." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243447380.
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Talbot, David C. "An Experimental and Theoretical Investigation of the Efficiency of Planetary Gear Sets." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1330630066.
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Wolfer, Scott. "Design and Analysis of A General-Purpose Planetary Gear Durability Test Machie." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1409148817.
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GOTIA, BOGDAN, and MUCINO JORGE LOYA. "Advanced hybrid manufacturing process for high precision ring of a planetary gear – main focus on Abrasive Waterjet Machining." Thesis, KTH, Industriell produktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193043.
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Under år 2008 uppskattades den totala produktionen av kugghjul inom bilindustrin till 2000 – 2500 miljoner detaljer, varav 1000 - 1400 miljoner av dessa är av hög kvalité [1]. För precisionskugghjul med modul under 1 mm kan tidsbegränsning och kostnader kopplade till design av skärverktyget elimineras genom att tillämpa en flexibel tillverkningsmetod som tillexempel abrasiv vattenskärning (AWJM). Denna studie undersöker designen av ett hybridtillverkningssystem konfigurerat kring AWJM samt föreslår finbearbetningsprocess via konventionella bearbetningsmetoder. Den tekniska möjligheten att producera kuggring av hög precision testas med en 5-axlig vattenjetmaskin och utvärderas enligt kvalitets nivåer för DIN-standard. För detta ändamål studerades ett kugghjul med modul 0,55 mm, 199 tänder, 110 mm i ytterdiameter och 72 mm i innerdiameter samt en tjocklek på 6 mm gjord av Armox T500, höghållfast stål. Resultaten visar på hög potential att uppnå ISO standardkvalité för kugghjul. Vissa kvalitetsegenskaper, definierade i DIN- och ISO-standarder, till exempel ytfinhet med låga värden; Ra 0,8 μm, uppnås vid användning av AWJM. Andra kvalitetskännetecken som profilavvikelse är relaterade till parametrar som skäreffekt, matningshastighet, mängd abrasivmedel, etc. Framtagna värden sträcker sig från Q10 och Q11 enligt DIN3967 vilket möjliggör slutoperationer som till exempel slipning. Geometrisk avvikelse, på ovansidan, gav en maximalt värde på 7 μm med en standardavvikelse på 4 μm. Jetstrålens eftersläpning observerades och kan kompenseras för medan resultatet av rundade hörn existerar i alla skärning med AWJ. Radiell förskjutning, tandtjocklek och index avvikelser visar värden som kan förbättras tillsammans med processoptimering, maskinkalibrering och eliminering av inneboende positionsavvikelser i maskinen. Varje enskild geometri kräver specifika processparametrar och CAM-programmens algoritmer behöver vidare optimeras för arbeten med tämligen små geometrier.Production of gears for the automotive industry during 2008 is estimated to have been between 2000 – 2500 million pieces, from which 1000 to 1400 million pieces were high quality gears [1]. For precision gears with module below 1 mm, the time limitations and costs associated with the design of the cutting tool can be eliminated by using a flexible manufacturing technology such as Abrasive WaterJet Machining (AWJM). This project investigates the design of a hybrid manufacturing system configured by use of AWJM and proposed finishing processes using conventional machining methods. The technical feasibility is analysed to produce high precision ring gears using a 5-axes AWJM system to achieve DIN standards quality levels. For this purpose, a gear with a module of 0.55 mm, 199 teeth and 110 mm in the outer diameter and 130 teeth and 72 mm in the inner diameter with a thickness of 6 mm is studied; the selected material is Armox T500, a high strength steel. The results indicate high potential of producing ISO quality standard gears. Certain quality characteristics defined in DIN and ISO standards, for instance surface roughness – values as low as Ra 0.8 μm, are possible to achieve accurately by using AWJM. Others quality features as profile deviation, are related to parameters as cutting power, feed rate, abrasive feed rate, etc. The displayed values ranged Q10 and Q11 according to DIN3967 which allows for use of further finishing operations such as grinding. The top geometry deviations of a 0.3 mm cut, display a maximum value of 7 μm with an average value of 4 μm. Observed jet lag effects can be improved. Rounded corner effect exists in all AWJ cuts. Runout, tooth thickness and index deviations show values that can be improved together with process optimization, machine calibration and elimination of machine inherent positioning deviations. Each particular geometry needs specific process parameters and CAM software algorithms need further optimization for working with rather small design geometries.
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Corey, Christopher A. "Epicyclic Gear Train Solution Techniques with Application to Tandem Bicycling." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9644.
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This thesis presents a unification of kinematic and force-based methods for the design and analysis of planetary gear trains along with a discussion of potential applications in tandem biking. Specifically, this thesis will provide a simple solution technique for the general case of a two-degree of freedom (2DOF) planetary gear train along with new graphical design aids. It will also address the use of epicyclic gear trains as a power coupling in a tandem bike. In the current literature, planetary gear trains are given a clear treatment with regard to the pure kinematics of the system, but little or no literature exists that includes the torques present in the system. By treating both the kinematics and torque balance of the most general case, this thesis attempts to fill a void in the current literature. After developing the solution to the general two-degree of freedom case using the Willis formula, a force analysis will be performed using the conservation of energy principle assuming zero losses. Once the total solution is known, nomographs will be presented as a simple design tool. These graphical aids enable the designer to simultaneously approximate both speeds and torques for the mechanism. After fully developing a satisfactory solution technique and design tools, these will be applied to the problem of coupling the power provided by the riders of a tandem bicycle.Master of Science
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Bahk, Cheon-Jae. "Analytical Study on Nonlinear Dynamics of Planetary Gears." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1332371195.
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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 thought of and evaluated through simulations using Matlab and Simulink. Most of the components of the rig were manufactured in the workshop at Atlas Copco in Nacka. Methods fo rmeasuring torsional, transverse and acoustic vibration was implemented and analyzed. There are many different parameters considering fault of fixed shaft gears. However, these are not easily applicable on a planetary gear because of the nature of its design. Therefore, special techniques are required. Two “new” parameters were tested (NSDS,FRMS [Lei. et al.]) with positive results. Pitting of individual gear members could befound.
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Guo, Yi. "Multi-body and Nonlinear dynamics of Planetary Gear Drivetrains Considering Bearing Clearance and Acoustics." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1312817240.
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Нікітін, Михайло Олексійович, Михаил Алексеевич Никитин, Mykhailo Oleksiiovych Nikitin, and Р. Т. Касым. "Условие сборки соосных планетарных механизмов." Thesis, Изд-во СумГУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/6271.
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Wu, Yu-lung, and 吳昱龍. "Design of Planetary Gear System with Double Circular-Arc Hilical Gear." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/82683420792134468931.
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碩士正修科技大學
機電工程研究所
95
This paper studied and improved a three stage planetary gear winch with double circular-arc gears. Tooth contact analysis and bending stress were studied by chinese standard double circular-arc gear. The contact stress can be reduced largely because the relative curvature of tooth of double circular-arc gear is smaller than involute gear. The winch with double circular-arc gear can sustain a larger torque than the winch with other type of gear, therefore the size of the winch can be reduced too. Tooth contact stress and bending stress were studied in this paper. Finally, we developed a new tooth profile for double circular-arc gear. This paper improved original double circular-arc gear, developed a new design and applied analysis software to this drive. The processes of design and manufacture were more simple. The advantage of the new drive was confirmed.
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Frank, Nicolas Walter. "Analysis of the Concentric Planetary Magnetic Gear." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9158.
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In the field of electric machine design, a trend in many applications has been to design machines with increasing torque density. When machines fail to meet torque density requirements or are simply incapable of matching load torque, gears are commonly used. Magnetic gears have been proposed as a means of increasing torque density within electromechanical systems, while avoiding problems associated with traditional mechanical gears. While the idea behind magnetic gears goes back to early patents, their study and use in industry has been very limited to date.
This study looks into variations of the gear which could lead to more industrial use. The effect of pole count upon torque ripple is investigated with finite element analysis (FEA). The analysis is extended to new magnetic layouts which borrow from permanent magnet machine design. One of the most critical components of the gear, the stator pole pieces, are also investigated for variations which aid in construction while maintaining the performance of the gear.
As a means of supplementing analysis of the gear, winding function theory (WFT) is used to analyze the gear. Winding function theory has enjoyed success with induction, synchronous, and even switched reluctance machines in the past. This study is the first of its kind to apply winding function theory to a device devoid of windings altogether. It is shown that this method is capable of generating the stall torque and steady-state torque ripple waveforms which have been commonly attempted with FEA.
While magnetic gears enjoy distinct advantages over mechanical gears such as inherent overload protection, they are not as torsionally stiff as their mechanical counterparts. As such, the use of damper windings for the purpose of stiffening the gear against transient oscillations is also investigated. Several competing designs are investigated for their performance, and a final design is studied which is capable of arresting transient oscillations in less than a second.
In addition, a prototype has been fabricated and will be used to verify the analysis undertaken. The prototype is used to verify variations of the stator pole pieces as well as the inner rotor magnetic layout. A dynamometer has been assembled to test the performance of the prototype. A new design is also proposed for future work.
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Huang, Chia-Lin, and 黃佳凌. "Modeling and Application of Planetary Gear Train." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/27726735684445786726.
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Liang, Chun-Chieh, and 梁竣傑. "Dynamic Load Analysis of Planetary Gear Systems." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/53926229843237199791.
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碩士中華大學
機械與航太工程研究所
94
This thesis expects to analyze the dynamic characteristics of the 2K-H planetary gear systems that includes the investigation effect of the design parameter on the gear system dynamics. The analysis techniques of planetary gear system dynamics will be established. Due to their special features of the high power-volume ratio and easy realization of the concentric input and output shafts, the planetary gear sets have been widely used in machine transmissions. However with the increase of their higher demand of specs such as rotation speed, precision, and noise and vibration etc, the analysis of dynamics for the gear systems has become important. Firstly, the tooth profiles of standard and nonstandard gears, mesh points, and phasing relation of variant teeth pairs are formulated. Then, the time varying stiffness of sun gear- planet gear and ring gear- plant gear meshing gears can thus be calculated. Next, after employing Lagrange’s equation, the equations of motion of the gear systems in an equivalent discrete from, including the models of gears, a motor, gear shafts, and loadings, are derived. Further, the torques applied on the driving and driven shafts are the excitation force of the systems. Finally, using the Jacobi transformation and the Runge-Kutta integration respectively, natural frequencies, dynamic deformations and meshing forces, and dynamic factor will be calculated. Additionally, this thesis, using the commercialized software LS-DYNA, calculates the planetary gear system dynamics in a continuous approach. The analyzing process; including geometric model and mesh generation, initial and boundary conditions, and numerical and output controls; are introduced abundantly. The result by using LS-DYNA is compared to the result by the above discrete model by which the proposed discrete model both in theory and in numerical can be verified. Finally the influences of the design parameters including the rotation speed, damping, and correction factor on the gear system dynamics analysis are investigated. It demonstrates that the theoretic model and the calculated results of this thesis can be successfully applied when designing planetary gear systems.
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Chen, Dao-Hong, and 陳道鴻. "Study of Planetary Gear Power Split System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/21738007840821932468.
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碩士明志科技大學
機械工程系機械與機電工程碩士班
103
This study designs and produces a power split drive (PSD) of the planetary gear set in order to verify the operation of parallel hybrid vehicles and its electromechanical energy conversion efficiency. Planetary gear contains a 30 teeth of the sun gear, three 24 teeth of planetary gear and a 78 teeth of ring gear. For the convenience to measure the energy conversion efficiency of the power split drive, this study uses the test rated power of 1000W BLDC to instead the engine, and the rated power of 750W BLDC and 350W BLDC to instead MG2 as motor and MG1 as generator respectively to test the operation of the power split drive (PSD) of the planetary gear set and measuring the energy power systems in normal mode and recirculation mode of conversion efficiency. These results indicate that the production of this study, a power split drive (PSD) of the planetary gear set, maximum system efficiency is 50% approximately. This study uses ADVISOR as a simulation platform to analyze each operation mode calculation of TOYOTA Prius. And power split drive is simulatedrespectivelyin the normal and re-circulation driving modes. The speed and torque of engine and MG1 and MG2 are inputs and the ring gear is output to measure the output torque, the speed and power variation ofpower split drive in two driving modes.
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Lin, Feng-Tien, and 林豐田. "Constant Speed Mechanism of Planetary Gear Train." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/41696246134654558915.
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碩士國立中山大學
機械與機電工程學系研究所
95
In current years, searching for substitute energy such as the wind and ocean power of renewable energy is an important subject due to the petroleum shortage. The gear box is the key mechanism in the system of wind and ocean power. Moreover, the main function of the system is to generate electricity by speeding up the rotative velocity. However, the power of environment changes momentarily and makes the turbine a variable input. In order to improve the efficiency of generating electricity, it should get the constant input to keep the high quality of generating electricity. First of all, the study focuses on the gear box and synthesizes a constant speed mechanism of planetary gear train which degrees of freedom is two. In the mechanism, inputs are the variable speed turbine and a constant speed motor. When they input the mechanism, a constant speed output will be made to supply the generator. Secondly, it is necessary to set up the real object of the constant speed mechanism of planetary gear train. Finally, observing the real condition from the experiment to prove the theory is correct.
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Chen, Tzu-Hsia, and 陳子夏. "Research and Development of Planetary Gear Reducers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/4qvcr4.
Full textAbstract:
博士國立虎尾科技大學
機械與機電工程研究所
101
Due to the reason of compact size, light weight, strong strength, high reduction ratio, and multi-degrees of freedom, planetary gear trains are commonly used in various transmissions. The works in this thesis including kinematic design, efficiency analysis, engineering design, and prototype manufacture of planetary gear trains, the complete process can call as the research and development of planetary gear reducers. By referring to the train value equation and latent power theorem, the reduction-ratio and meshing-efficiency equations of planetary gear trains are derived. Based on the reduction-ratio and meshing-efficiency equations, the kinematic design and meshing-efficiency analysis of corresponding planetary gear trains are accomplished. Four prototypes of planetary gear reducers are manufactured. The four prototypes including: (a)2K type planetary gear reducer with reduction ratio equal to four (Rr=4), (b)Two-stage planetary gear reducer with Rr=19.8, (c)3K type planetary gear reducers with Rr=156, and (d)3K type planetary gear reducers with Rr=50, and Rr=100. The four prototypes are installed to the test platform to carry out the efficiency test. We conclude: 1. For one- and two-stage planetary gear reducers, the mechanical efficiency decreases when input rotating speed increases. 2. For one- and two-stage planetary gear reducers, the mechanical efficiency increases when output torque increases. 3. Due to the reason of power circulation, the meshing efficiencies of 3K and 2K-2H type planetary gear reducers are not good.
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De, Smidt Marc Ryan. "Internal vibration monitoring of a planetary gearbox." Diss., 2010. http://hdl.handle.net/2263/27506.
Full textAbstract:
Vibration monitoring is widely used to determine the condition of various mechanical systems. Traditionally a transducer is attached to the structure under investigation and the vibration signal recorded. This signal is then processed and the required information extracted from the signal. With epicyclic gearboxes this traditional approach is not advisable. This is in part due to the fact that the planet gears rotate internally on a planet carrier. Special techniques are therefore required to extract a viable data signal from the measured vibration signal. These techniques require an additional post-processing step in which a compiled data signal is extracted from the measured data signal. This work investigates the possibility of mounting transducers internally on the rotating planet carrier. Mounting transducers at this location removes the relative motion seen in traditional measurement techniques. An epicyclic gearbox is modified to facilitate the internal mounting of the accelerometers. A number of implementation problems are highlighted and solutions to these problems are discussed. A large portion of the work is dedicated to implementing and qualifying the epicyclic time synchronous averaging technique which is traditionally used to evaluate epicyclic gearboxes. As this technique forms the basis to evaluate the data obtained from internal measurements, it is of fundamental importance that the technique is implemented correctly. It is shown that vibration data can be reliably measured internally, by means of accelerometers mounted on the planet carrier. The internally measured data is compared to data obtained by traditional techniques and shown to be equally adept in detecting deterioration of a planet gear tooth. Simple condition indicators were used to compare the vibration data of the two techniques. It was seen that the data obtained from the internally mounted accelerometers was equally, and in certain cases, slightly more sensitive to planet gear damage. This implies that the technique can be used successfully to evaluate epicyclic gearbox damage. There are a number of practical implementation problems that will limit the use of this technique. As the technology becomes available to transmit measured vibration signals wirelessly, the application of the internal measurement technique will become more viable. A preliminary investigation was also launched into the relationship between a planetary gearbox with a single planet gear and one with multiple planet gears. It is illustrated that vibration data, measured from a gearbox containing a single planet gear, shows an increased sensitivity to planet gear damage. Although a special test rig might be required, the increased sensitivity to damage can provide a method to test planet gears in critical applications such as aircraft gearboxes. CopyrightDissertation (MEng)--University of Pretoria, 2010.
Mechanical and Aeronautical Engineering
unrestricted
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Huang, Guan-lin, and 黃冠霖. "Analysis of Load Sharing in Planetary Gear Sets with a Floating Sun Gear." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/95522381045884702820.
Full textAbstract:
碩士國立中央大學
機械工程研究所
99
Planetary gear sets can achieve higher power density levels, because of multiple parallel power paths by each planet branches. However, load sharing among planets are usually even, due to the manufacturing errors, assembly errors and deformation of parts in planetary gear sets. Therefore, load balancing mechanisms are widely used in multi-planet system. The most common load balancing mechanism is floating sun gear design. In the recent studies, simplified mathematical models are often used for analysis of load sharing in planetary gear system. The goal of the thesis is to establish an approach based on the involute gear geometry for analysis of load sharing among the planet gears, possibilities for assembly, and movable area of the sun gear. Mesh relation for the planetary gear set is at first derived based on two-dimension involute gear geometry. The possibility to assembly of the planetary gear train under consideration of various design parameters and errors is determined according to the assembly process. The movement of the sun gear is restricted by planets in two different types, i.e. restriction by single planet with double contact tooth pairs, and restriction by double planets with single contact gear tooth pair. In order to find out the movable area of the sun gear center, maximum movable distance of the sun gear in any direction will be obtained according to both the restriction types.. The shared loading among the planets in the planetary gear train is analyzed in the study by using an analytical approach as well as a numerical method. A jumping behavior of the load sharingin the planetary gear set with a fixed sun gear is also explained in the thesis based on the change of the meshing stiffness of the contact gear tooth pair due to the change of the number of the contact tooth pair. The study also introduced object-oriented programming for anakysis to enhance the calculation efficiency. The analysis result for the movable area of the floating sun gear center in the planetary gear train with 3 to 5 planets showed that the boundary of the movable area is a polygon and the number of the borders is twice the number of the planets. Double planets with single contact tooth pair is the most likely restriction type of the floating sun gear. Furthermore, the movable area of the floating sun gear is proportional to the backlash corresponding to the tooth thickness tolerance. Acoording to the the analysis result of the assembly condition of the planetary gear set with three planets under consideration of tooth thickness errors, radial pinhole position errors and tangential pinhole position errors, the maximum tolerable error value for assembility is linearly proportional to the backlash. The analysis of the load sharing in the planetary gear set under consideration of the influences of various types of errors and design parameters shows that the tangential pinhole position error is the critical influence tolerance. Second is the tooth thickness error. The radial pinhole position error has little effect on the load sharing behavior. In addition, the uneven load sharing due to a tangential pinhole position error can be compensated with installation of a planet gear on the pinhole position with specific tooth thickness. Furthermore, increased input torque is also ablbe to reduce the uneven load sharing. In case of floating sun design, the even load sharing among planets can be achieved for the planetary gear train with three planets. Similary the load sharing in the gear trains with four or five planets can be also improved, but uneven.
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Kuo, Hsiao-Hui, and 郭曉薈. "The Efficiency Analysis and Test of Spur Gear Pairs and Planetary Gear Train." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/32423x.
Full textAbstract:
碩士國立虎尾科技大學
機械與機電工程研究所
100
The purpose of this thesis is to explore the meshing efficiency of spur gear pair and planetary gear train, including the theoretical analysis and experimental test. Due to the reasoning of high meshing efficiency of gear pairs with parallel axle, little paper focuses on the meshing efficiency of gear pairs with parallel axle recently. According to meshing theory of gearing, this thesis explore the meshing characteristics and meshing efficiency of spur gear pairs (including external and internal gear pairs) with different reduction ratios. In addition, this thesis also explore the meshing efficiency of planetary gear train. First, based on the theory of gearing, the meshing efficiencies of external and internal gear pairs are derived. According to the concept of latent power, the meshing efficiency of planetary gear train is also derived. Then, the engineering design and prototype manufacture of planetary gear reducer are carried out. Finally, the transmission efficiency test of this prototype is carried out to verify the theoretical analysis. The planetary reducer designed in this thesis has the theoretical overall theoretical transmission efficiency (including meshing efficiency, bearing efficiency, and seal efficiency) about 94% to 96% and experimental efficiency about 92% to 94%. The error between both is only about 1~3%. The results of this thesis proved that the meshing efficiencies of external spurt gear pair, internal spur gear pair, and planetary spur gear train are very high.
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Hsien, Cha Pao, and 查保賢. "Micro Planetary Gear Parametric Design and Modal Analysis." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/84503546738537505874.
Full textAbstract:
碩士正修科技大學
機電工程研究所
100
With the high-tech advances, improved design software and the increasing performance and accuracy of processing machine tools, client demands for improvement in the product quality requirements; In addition to the economic cycle accelerating, corporate vision and planning should go on the cutting edge. Through the abilities enhancing of the research and development of energy, it might be recovering of recession. Of planetary gear reducer industry, product research and development focus shift from the functionality of the finished product to the product price competitive evolution to the requirements of a good quality of operation, combined with modern software-aided design, manufacturing, analysis and simulation techniques, to shorten the product development cycle. This thesis focuses on the above view for study, the first analysis of vibration theory, the mathematical model of the gear pair vibration model with planetary gear. Secondary, Pro / E software were to construct the spur gear, ring gear and the planetary gear geometric model. Through parametric modeling methods, the model can be used as a future tooth modified design to establish a standard process, completing the planetary gear system modal analysis. At last, use software ANSYS to constructed the gear’s module analysis, and software Solidwork / COSMOSMotion constructed nature of kinematic analysis of gear pair. Finally, both to design and discuss this work can be refer industry planetary gear system reference.
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Chang, Shi-Ren, and 張釋仁. "Hybrid Control of Cam-Controlled Planetary Gear Trains." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/b49a75.
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碩士國立虎尾科技大學
自動化工程研究所
100
The purpose of this work is to propose hybrid control systematic approach of motion control for cam-controlled planetary gear trains (CCPGTs), such that it can produce precision output motions. First, the motion characteristics and structures of cam-controlled planetary gear trains are investigated. Then, the parameters of size and the speed of input into the equations of motion, you can get the desired curve of output motion. Moreover, the controller design is performed. The mathematical model of the system is obtained by the system identification experiment, and then the design and analysis of modified fuzzy sliding mode control and iterative learning control, respectively, are conducted to find the better controller types and control parameters, Furthermore, an example is given to illustrate the design and simulation of the process. Finally, the experimental results show that the experimental output speed is well agreed with the required output speed, and the fuzzy sliding mode control can control the output speed of movement in the desired curve, when coupled with iterative learning control, the each cycle can gradually reduce the error of each cycle, Consequently, the proposed method for the motion design and control of hybrid control systematic approach is feasible.
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Ye, Siang-yu, and 葉湘羭. "Analysis of Static Load Sharing in Planetary Gear Sets with a Floating Planet Gear." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/01872711490316180828.
Full textAbstract:
碩士國立中央大學
機械工程研究所
99
Planetary gear drives have the advantages of high power-weight ratio, large gear ratio, as well as smooth transmission with high efficiency. They are often widely applied in mechanical power transmission system, such as vehicles, ship machinery, production machinery, and wind turbines. However, in the practice, the load sharing among the planets will be not even due to the presentence of manufacturing and assembling errors. It means the planetary gear set can’t provide power transmission with a larger torque even by increasing the number of planetary gears. In order to solve the problem, many load balancing mechanisms are applied to meet the requirement of even load sharing by using flexible elements or floating gears to have more degrees of freedom. One of the well-known methods for the planetary gear drives is the design with flexible pins, i.e. the planet gears are flexibly supported. The aim of this study is to analyze the static load sharing and load distribution in planetary gear sets with a floating planet gear in the presentence of manufacturing and assembly errors. The geometrical relation between the manufacturing errors and the gaps of the engaged teeth among the gears of the planetary gear drives is at first analyzed. Based the influence coefficient method, a numerical method of loaded tooth contact analysis for planetary gear sets in the case of multiple gear-pairs and multiple tooth-pairs is also developed to analyze the load sharing among the planet gears and the load distribution on the engaged tooth flanks., The loading in the planetary gear sets with flexible supported planet gears is further analyzed by using the developed LTCA method and the conditions of load equilibrium of the planets and the relation of the tooth gaps due to the position change of the planets. The unknowns can be thus solved, including the balanced positions of the planets, the contact stresses distribution on the flanks and also the load sharing among the planet gears. In order to verify the feasibility of this theory, the analyzed results for the planetary gear sets with manufacturing and assembly errors are also compared with the finite element method under consideration of the planetary gear sets with rigidly or flexibly supported planets. Both the calculated results are in good agreement. The influences of the number of the planets, the stiffness of the planet supporting, and the transmitted torque on the load sharing are also discussed. The analysis of the load sharing in planetary gear set under consideration of the influences of various types of errors and design parameters shows that with different planet number the tangential pinhole position error, tooth thickness error and the radial pinhole position error all can influence the load sharing of planet gears. Which the pinhole position error is the critical influence tolerance, the tooth thickness error is the second and the radial pinhole position error has little effect. In case of floating planet gears design, the even load sharing among planets can be achieved. In the comparison of design parameters, the smaller planet flex-pin stiffness the more even load sharing and increased input torque can reduce the uneven load sharing.
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Chih-HsiangLiang and 梁智翔. "Design and Analysis of Small-Module Planetary Gear System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/e6qck7.
Full textAbstract:
碩士國立成功大學
航空太空工程學系碩士在職專班
103
SUMMARY The objective of this research is to design and develop a small-module planetary gear system which is applied to medical dental low speed Handpiece. To design this planetary gear system, the MITCalc and Solidworks softwareare used, and through mechanical manufacturing methods to produce the hardware. Through measurements this planetary gear system is verified to be consistent with the requirement of ISO 14457. Also it is found the relationship between the parameters and performance. As the result of the experimental, upgrade the accuracy of gear can reduce the temperature rise, noise and vibration. Decreasing the gear backlash can reduce the noise, but the temperature rise will be high; Increasing the gear backlash can lower the temperature rise, but the noise will be raised also. Therefore, the gear backlash will affect the temperature and noise. With or without the profile shifting coefficient makes no big difference of the temperature; however, the noise and the vibration is obvious lower than that of the gear with profile shifting coefficient. Keywords: planetary gears, small-module gear, spectral response, vibration and noise. INTRODUCTION There are many gear design software, however, no one focus on the important gear parameter of its accuracy, backlash, profile shifting coefficient...etc. All of those parameters are dependent on designer’s experience to adjust, and it often requires a lot of time to make adjustments. This thesis will analyze and discuss the effects of the parameter to the temperature rise, noise, vibration data by experiment to find the relationship between these parameters, to reduce research and development time and to improve gear quality. METHODS AND MEASUREMENT In this study, MITCalc software is utilized as the design platform to calculate gear parameters and output 3D models. Solid models is also built by 3D CAD software – Solidworks. By mechanical manufacturing methods, a planetary gear system with module is 0.25 and reduction ratio is 1: 4 is produced with its model no. 2K-H. In experimental and analysis, install the planetary gear system onto a medical dental low speed handpiece which is commercially available. The measuring instruments including: digital thermometer to measure the temperature, programmable sound level meter to measure noise, and spectrum analyzer to measure the vibration data. RESULTS AND DISCUSSION As the result of the experimental work, accuracy class will be the most important parameters affecting the quality of the gear system. When the gear accuracy class upgrade from 4 to 2, it can reduce the temperature rise 4℃, reducing the noise 8 dBA, and reducing the vibration quantity 2 Grms. The performance of profile shifting coefficient of gear is better than that of no profile shifting coefficient of gear, reducing the noise 2 dBA, reducing the vibration quantity 0.75 Grms, but for temperature rise is no big difference. As the gear backlash from 0.01 ~ 0.02mm is enlarged to 0.02 ~ 0.03mm, lubricating effect becomes better, and temperature rise can be reduced 1.4 ℃, because the gear backlash increased; however, the noise increased to 2.8dBA and vibration quantity increased to 0.24 Grms. CONCLUSIONS The design software of MITcalc a planetary gear system is successfully used in the small-module gear system design with a satisfactory performance. It can be made conformable to the medical regulations requirements of ISO 14457. As one needs a high quality planetary gear system, it can be upgraded by raise the accuracy class. When one needs a low noise and low vibration planetary gear system, it can be set profile shifting coefficient and decrease backlash of gear. And as you need to reduce the temperature rise of the planetary gear, it can be appropriately enlarged gear backlash.
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Chen, Song-Shyong, and 陳松雄. "Design and Development of a Planetary Gear Locomotive Systems." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/46762861079183493291.
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碩士國立臺灣科技大學
電機工程研究所
82
This main purpose for the development of walking machines is to replace wheel or tracked vehicles advancing on rugged road or areas which is inaccessible to either wheeled or tracked vehcles. This thesis aims at the research of a high performance plane- tary gear locomotive leg. In addition, various control algorithms shall be developed and applied to perform the "walk". In the developed hardware, we have designed a multiaxis cont- rol system for the leg. In addition, interface circuits are also included. As for the developed software, there are system testi- ng programs, trajectory planning program and the position and force control software. Experimental results shows that the developed leg''s performa- nce has met our expectation. This leg shall pave a way for furth- er development of a quadrupeed walking machine.
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Liu, Chao-Tien, and 劉招典. "The study of new type Planetary gear reduction device." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/44137014591898042312.
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碩士國立勤益科技大學
機械工程系
100
Spur gear reducer is efficient enough, but it is too big when it undergoes group 1 or group 2. Besides, spur gear needed to be custom designed in the market and It takes more time to be produced. In nowadays, eco-friendly is one of the essential conditions of producing process. Protecting the mother earth is one of the most important things that we have to consider about. Is there any kinds of spur gear reducer which is small and efficient available? The answer is a big fat “yes.” Planetary gear train is combined by sun gear, planetary gear and annular gear. Picture 1 is the structure of epicyclic gear. The process of producing it is as follow: to fix the number of the certain of gear teeth, then makes the gear which is going to be paired with plus or minus one gear or two teeth. After the process, the original reducer will become reduction gear which has arbitrary reduction ratio.
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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.
Full textAbstract:
碩士國立中山大學
機械工程研究所
82
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, base on the graph representation, the structural code for mechanism is proposed to identify the isomorphism of transmission mechanism. Then, base on the fundamental circuits, the systematic procedure for the performance analysis of transmission mechanisms is proposed. A computer program is further developed for the automatic performance analysis. Next, a systematic methodology for the synthesis of planetary geared kinematic graph is proposed by using the acyclic graphs. The data base of Structural codes of one-DOF planetary geared kinematic chains up to nine links is listed. Finally, base on the characteristics of transmission mechanisms, the admissible planetary gear trains for transmission mechanism are generated from the data base of structural codes. And an atlas of admissible planetary gear trains up to seven links is listed. The result of this work is of benefit for the kinematic design of transmission mechanisms.
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Zhang, Xin-Dong, and 張薪棟. "Cutting Simulation and Analysis of Paradox Planetary Gear Drives." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/87761969396544422428.
Full textAbstract:
碩士健行科技大學
機械工程系碩士班
103
In the study, simulation system of gear cutting is developed by visual basic and SolidWorks API. This system can simulate the generation process of three-dimensional CAD models of gear by controlling proper relative motion relationship between cutter and gear blank in SolidWorks. Thus, the 3D models of the ring gears which have the same pitch radii but small tooth number differences can be obtained easily. The results of this study contribute to the design and manufacture of mechanical paradox planetary gear drives. Finally, the prototype of paradox planetary gear drive with high reduction ratio is realized by 3D printing.