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Dissertations / Theses on the topic 'Turbocharger'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Duda, Tomasz. "Turbocharger performance and surge definition on a steady flow turbocharger test stand." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760881.

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Turbocharger performance maps are vital components used in an engine-turbocharger matching process, a 1D engine performance development stage and a day-to-day operation of a turbocharged vehicle. The main aim of this thesis is the investigation of the turbocharger compressor performance when operating with an alternative to air substitute gas. This occurs, for instance, when turbocharging and low pressure exhaust gas recirculation (LP EGR) technologies are combined. To conduct the experimental study of the turbocharger performance with substitute gas a steady-state turbocharger test facility w

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2

Tan, Yiping. "Automotive diesel turbocharger investigation." Thesis, University of Bath, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437605.

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3

Dale, Adrian Peter. "Radial, vaneless, turbocharger turbine performance." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/11363.

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4

Phull, Harpinder Singh. "Investigation into Turbocharger crazing defect." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5447/.

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A programme of research was undertaken to identify the mechanisms of formation of voids and defects in aluminium alloy C354 and C355 castings. The following aspects of the material processing were studied as independent and linked effects: casting technique and associated variables, hot isostatic pressing cycle parameters, and heat treatment cycle. Microstructure related driving forces for defect formation were quantified using differential scanning calorimetry and quantitative metallography and surface effects investigated using x-ray photoelectron spectroscopy. It was shown that by controlli

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5

García, Tíscar Jorge. "Experiments on turbocharger compressor acoustics." Doctoral thesis, Editorial Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/79552.

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As turbocharging requirements raise to face an increasingly stricter environmental regulation of internal combustion engines, concerns regarding their acoustic emission become more pressing. Since downsized engines require higher boost pressures and lower mass flow rates, the turbocharger compressor is forced to work at more unstable regimes, where flow patterns become more complex and noise levels rise. This thesis aims to thus to investigate these issues, proposing methodologies to characterize the acoustic emission of turbocharger compressors and implementing them in different experimen

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6

Aghaali, Habib. "On-Engine Turbocharger Performance Considering Heat Transfer." Licentiate thesis, KTH, Maskinkonstruktion (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93981.

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Heat transfer plays an important role in affecting an on-engine turbocharger performance. However, it is normally not taken into account for turbocharged engine simulations. Generally, an engine simulation based on one-dimensional gas dynamics uses turbocharger performance maps which are measured without quantifying and qualifying the heat transfer, regardless of the fact that they are measured on the hot-flow or cold-flow gas-stand. Since heat transfer situations vary for on-engine turbochargers, the maps have to be shifted and corrected in the 1-D engine simulation, which mass and efficiency

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7

Tuominen, Jonny. "Measurement of Blowby in a Turbocharger." Thesis, KTH, Maskinkonstruktion (Inst.), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100843.

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The purpose with this Masters Thesis was to design a measurement rig for measurement of the blowby flow that originates from the turbocharger in a passenger car engine. A leakage of com-bustion gases and fresh air from the turbine and the compressor into the bearing housing of the turbocharger is the source of the blowby flow. Principally the measurement rig consists of two parts: a flowmeter for measurement of the blowby flow and a separation unit for separation of the blowby gases from the engine oil that is used for the lubrication of the bearings in the turbo-charger. The rig will be conne

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8

Tejada, Zúñiga María Cristina. "Observability studies of a turbocharger systems." Master's thesis, Pontificia Universidad Católica del Perú, 2016. http://tesis.pucp.edu.pe/repositorio/handle/123456789/6955.

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The use of diesel engine turbochargers is increasing today, as it represents an option that o ers high e ciency and low fuel consumption. To design the control system in order to reduce the level of exhaust emissions there is a need for information about all states that are not measurable. To this end, observers or virtual sensors are more frequently applied, achieving estimates of the system states from inputs and measured output. To propose an observer, the precise mathematical model of the air path diesel engine system is used. This is a nonlinear model of a third order which is analy

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9

De, Wet Andrew Louis. "Performance investigation of a turbocharger compressor." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17784.

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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Stellenbosch University participated in a project to re-design the compressor section of a diesel locomotive turbocharger. Tests conducted on the prototype compressor showed possible rotating stall in the diffuser section before the designed higher pressure ratio could be achieved. When approaching the higher pressure ratio, the compressor inlet trunk started to rhythmically collapse (due to suction), the engine shook and bellows of black smoke were exhausted by the engine. It was decided to simulate the prototype compr

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10

Storm, Josefin. "Heat Transfer Modeling for Turbocharger Control." Thesis, Linköpings universitet, Fordonssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141949.

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Turbocharging is a way to stay competitive on the market where there are increasing demands on fuel consumption and engine performance. Turbocharging lets the engine work closer to its maximum power and thereby reduces the relative losses due to pumping and friction. The turbocharger is exposed to big temperaturedifferences and heat flows will occur both internally between the turbine and the compressor as well as between the turbocharger and its surroundings. Away to get a better understanding of the behaviour of the turbocharger is to understand the heat flows better. This thesis is therefor

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11

Ismail, Muhammad Izzal. "One-dimensional modelling of pulse separation strategy, waste-gated turbines and electric turbocharger systems for downsized turbocharged gasoline engines." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/58097.

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The demand for CO2 emission reduction for modern road vehicles has seen engine downsizing become a key trend in internal combustion engine design: a smaller engine has reduced pumping, frictional and heat losses, and therefore better fuel economy. Turbocharger technology is one of the enabling technologies, offering lower specific fuel consumption and producing more power for a given engine capacity. The turbocharger matching process, which specifies an appropriate turbocharger design for a particular engine, is crucial in obtaining optimum engine performance. In order to achieve a high level

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12

Sivagnanasundaram, Subenuka. "Investigation of turbocharger compressor map width enhancement." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580087.

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This thesis presents an investigation of a shroud bleed slot system of a compressor stage from a turbocharger unit used in heavy duty diesel engines of approximately 300 kW. The first part of the work presented in this thesis deals with a detailed analysis of a compressor stage with and without a shroud bleed slot, and various slot geometries which include three different widths and three different positions of the slot. The second stage of this study is an investigation of an addition of a set of vanes in the annular cavity of the shroud bleed slot system. This investigation was performed usi

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13

Pesiridis, Apostolos. "Turbocharger turbine unsteady aerodynamics with active control." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498148.

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14

Cao, Teng. "Pulsating flow effects on turbocharger turbine performance." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708901.

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15

Kamesh, Punithavathy. "Oil-whirl instability in an automotive turbocharger." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/188121/.

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This thesis is concerned with a theoretical investigation into the nonlinear dynamic behaviour of a turbocharger. Specifically the instabilities due to oil-whirl are examined. These are self-excited vibrations existing in the form of an in-phase whirl mode and a conical whirl mode. Waterfall plots were provided by Cummins Turbo-Technologies Ltd., Huddersfield, UK, based on test data using two different unbalance levels on a turbocharger. The test with the high unbalance indicated that there was shift in the sub-synchronous frequency to synchronous frequency between about 80,000 rpm to 130,000

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16

Dehner, Richard D. "Simulation of Surge in Turbocharger Compression Systems." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306934392.

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17

Kabral, Raimo. "Turbocharger Aeroacoustics and Optimal Damping of Sound." Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207151.

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18

Rivadeneira, Juan Carlos. "Predictions versus measurements of turbocharger nonlinear dynamic response." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3723.

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The present work advances progress on the validation against measurements of linear and nonlinear rotordynamic models for predicting the dynamic shaft response of automotive turbochargers (TCs) supported on floating ring bearings. Waterfall spectra of measured shaft motions at the compressor and turbine ends of a test TC rotor evidences a complex response, showing synchronous (1X) and multiple subsynchronous frequencies along the entire operating speed range (maximum shaft speed ~ 65 krpm). Postprocessing of the raw test data by mathematical software allows filtering the synchronous and subsyn

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19

Nishimoto, Keane T. (Keane Takeshi) 1981. "Design of an automobile turbocharger gas turbine engine." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/41810.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.<br>Includes bibliographical references (leaf 24).<br>The turbocharger gas turbine engine was designed with the intent of being built as a demonstration for the Massachusetts Institute of Technology Department of Mechanical Engineering courses 2.005 and 2.006 to supplement material covered. A gas turbine operates on an open version of the Brayton cycle and consists of a compressor, a combustion chamber and a turbine. An automobile turbocharger was chosen because it contains a compressor and turbine on a

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20

Brandon, Sidney Jordan. "Effects of Heat Addition After the Exhaust Valve on a Small Turbocharged Diesel Engine." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/31874.

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Designers of engines have always looked for ways to improve the power to weight ratio of mobile internal combustion engines. This was especially true in aircraft engine design and engines for various forms of racing. Today designers are looking for ways to make everything from cars to road tractors to farm tractors lighter and thereby more efficient. In addition, in many cases these vehicles only need the maximum power that an engine can produce for a small amount of time. What is needed is a small, lightweight engine with the ability to produce a large amount of power for a short duration.

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21

Schleer, Matthias. "Flow structure and stability of a turbocharger centrifugal compressor /." Düsseldorf : VDI-Verl, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015054634&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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22

Savoulides, Nicholas 1978. "Development of a MEMS turbocharger and gas turbine engine." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17815.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2004.<br>Includes bibliographical references.<br>As portable electronic devices proliferate (laptops, GPS, radios etc.), the demand for compact energy sources to power them increases. Primary (non-rechargeable) batteries now provide energy densities upwards of 180 W-hr/kg, secondary (rechargeable) batteries offer about 1/2 that level. Hydrocarbon fuels have a chemical energy density of 13,000-14,000 W-hr/kg. A power source using hydrocarbon fuels with an electric power conversion efficiency of order

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23

Gong, Xiaoyang. "Total pressure loss mechanism in a diesel engine turbocharger." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23317.

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Simulation tools are intensively used in the design stage of diesel engines due to their contributions to significant savings in cost and time for the engine development. Since most of DI diesel engines are turbocharged, it is of vital importance to hold a good understanding of turbine and compressor characteristic to predict the engine performance accurately. However, this data is often not available from turbocharger manufacturers, particularly for turbines. On available turbine maps the operating range of the turbine is constrained due to limitations of conventional turbocharger test benche

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24

Liljefors, Felix. "Time dependent modeling of turbocharger failure using machine learning." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287451.

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Data-driven predictive vehicle maintenance can in principle reduce the risk of costly breakdowns, damaged cargo, and increased emissions due to faulty components. However, implementing a cost efficient predictive maintenance policy is far from trivial. This thesis presents a machine learning-based method for predicting turbocharger component failure in heavy-duty trucks, called Survival-PLSTM. Survival-PLSTM uses a recurrent neural-network to model time-series data of a vehicle’s operational history, and outputs an approximated cumulative hazard function. The method addresses a number of chall

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25

Carrasco, Mora Enrique. "Variable Stator Nozzle Angle Control in a Turbocharger Inlet." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174345.

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Turbochargers are becoming an essential device in internal combustion engines as they boost the intake air with more pressure in order to increase the power output. These devices are normally designed for a single steady design point but the pulsating flow delivered from the internal combustion engine is everything but steady. The efficiency drop experienced in the off-design points by the fixed geometry turbochargers have made some research groups to look into new variable geometry solutions for turbocharging. A nozzle ring is a device which normally achieves a higher performance under design

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26

Zdunek, Agnieszka Izabela. "Prediction of natural frequencies of turbine blades for turbocharger application : an investigation of the finite element method, mathematical modelling and frequency survey methods applied to turbocharger blade vibration in order to predict natural frequencies of turbocharger blades." Thesis, University of Bradford, 2014. http://hdl.handle.net/10454/7328.

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Methods of determining natural frequencies of the D76D88, B76D88, A86E93, C86G90, C86L90 and C125L89 turbine wheel designs for various environmental conditions were investigated by application of Finite Element Analysis and beam theory. Modelling and simulation methods were developed ; the first method composed of 15 finite element simulations ; the second composed of 15 finite element simulations and a set of experimental frequency survey results; the third composed of 5 simulations , an incorporated mathematical model and a set of experimental frequency survey results. Each of these methods

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27

Shaaban, Sameh. "Experimental investigation and extended simulation of turbocharger non-adiabatic performance." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974988219.

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28

Vargas, Gabriella Margarita Ascanio. "Performance monitoring and full diagnosis of a diesel engine turbocharger." Thesis, University of Sussex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494826.

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Turbocharging systems are of high importance in the enhancement of engine power and efficiency. Faults in such systems may cause increased emissions levels beyond those set by legislation, and may also compromise fuel efficiency. This thesis investigates the application of system identification and vibration signal analysis techniques for the performance monitoring of turbocharged diesel engines by exploring turbocharger behaviour. The first technique is based on the use of system identification to build models representing the input and output relationship of an engine process. In this case,

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29

Sutton, Anthony James. "Experimental evaluation of compressor variable geometry in a turbocharger compressor." Thesis, University of Bath, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289813.

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30

Glover, Stephen Brian. "Investigation into impeller exit flows of a turbocharger centrifugal compressor." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335494.

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31

Lymberopoulos, N. "Flow in single and twin-entry radial turbocharger turbine volutes." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47159.

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32

Shultz, Jacque. "Authenticating turbocharger performance utilizing ASME performance test code correction methods." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/8451.

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Master of Science<br>Department of Mechanical and Nuclear Engineering<br>Kirby S. Chapman<br>Continued regulatory pressure necessitates the use of precisely designed turbochargers to create the design trapped equivalence ratio within large-bore stationary engines used in the natural gas transmission industry. The upgraded turbochargers scavenge the exhaust gases from the cylinder, and create the air manifold pressure and back pressure on the engine necessary to achieve a specific trapped mass. This combination serves to achieve the emissions reduction required by regulatory agencies. Many en

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33

Alsaeed, Ali A. "Dynamic Stability Evaluation of an Automotive Turbocharger Rotor-Bearing System." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/32502.

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This project was initiated to more fully understand the dynamic stability of an automotive turbocharger rotor-bearing system using both linear and nonlinear analyses. The capabilities of a commercial Finite Element Analysis (FEA) code (computer program) were implemented in the investigation process. Several different hydrodynamic journal bearings were employed in the study of the turbocharger linearized dynamic stability. The research demonstrates how the linear analysis of a turbocharger rotordynamics can be very beneficial for the design evaluation and maintenance purposes.<br>Master of Scie

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34

Adams, Michael. "Stability Analysis of a Turbocharger for Marine Diesel Engine Service." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/42373.

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Rotor stability is essential to the life span of any piece of rotating machinery; it becomes increasingly critical in high-speed machinery such as turbochargers. Large turbochargers, such as those found in marine diesel propulsion engines where the rotor alone often exceeds forty pounds, require careful consideration regarding stability as well as load support during the bearing selection process. Logarithmic Decrement is the primary consideration for rotor stability. Commercial software is used to model and analyze a proven unstable turbocharger rotor. After confirming that the model exhib

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35

RACCA, ALBERTO. "Turbocharger Design Optimization by Adjoint Method Coupled with CHT Analysis." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2933754.

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36

Симоновський, Віталій Іович, Виталий Иович Симоновский, Vitalii Iovych Symonovskyi та А. А. Платошин. "Исследование влияния демпфирования в подшипниках при наличии внутреннего конструкционного трения динамику ротора турбокомпрессора". Thesis, Изд-во СумГУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/5974.

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37

Калінкевич, Микола Васильович, Николай Васильевич Калинкевич, Mykola Vasylovych Kalinkevych, А. В. Скорик та І. В. Гавриченко. "Проектування радіально-осьових каналів турбокомпресорів". Thesis, Вид-во СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/5576.

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38

Калінкевич, Микола Васильович, Николай Васильевич Калинкевич, Mykola Vasylovych Kalinkevych, И. В. Гавриченко та А. В. Скорик. "Анализ течения газа в радиальноосевом канале турбокомпрессора". Thesis, Изд-во СумГУ, 2009. http://essuir.sumdu.edu.ua/handle/123456789/6746.

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39

Пономаренко, Е. Н. "Исследование особенностей динамики роторов турбокомпрессоров в неустойчивой области частот вращения". Thesis, Сумский государственный университет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/31812.

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Существующие методы и программы расчёта динамики роторов позволяют определить критические частоты и формы, а также вынужденные колебания синхронной прецессии. В то же время эти программы не могут быть использованы для расчёта и прогнозирования таких сложных явлений, как потеря устойчивости и появления несинхронных суб- и супергармонических составляющих. Эти явления могут быть изучены с помощью численного интегрирования нелинейных уравнений движения ротора. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/31812

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Симоновський, Віталій Іович, Виталий Иович Симоновский, Vitalii Iovych Symonovskyi та С. С. Недайвода. "Исследование автоколебательных явлений в роторах турбокомпрессоров". Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8045.

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Тенденция развития современных роторных машин связана с ростом их производительности и рабочих частот вращения и уменьшением габаритных размеров агрегатов, что вместе с необходимостью обеспечения длительного ресурса работы накладывает существенные ограничения на использование подшипников качения. В связи с этим широкое распространение в качестве опор роторов высокоскоростных турбомашин находят подшипники жидкостного трения. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/8045

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41

Costall, Aaron. "A one-dimensional study of unsteady wave propagation in turbocharger turbines." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/18232.

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Flow in a turbocharger turbine is highly unsteady in nature as it responds to the exhaust manifold of an internal combustion (IC) engine. Despite this it is conventional to use quasi-steady turbine models in one-dimensional turbocharged engine simulations, even though they cannot reproduce the known hysteresis of turbine mass flow and performance characteristics recorded under pulsating flow conditions. Using filling-and-emptying models improves the situation by permitting mass accumulation in the turbine volute. Depending on the unsteadiness level, this approach may still be insufficient to c

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42

Wang, Xu. "A study into vibrations of turbocharger blading with a lacing wire." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/10754.

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The vibration of a turbocharger blade and dynamic characteristics of bladed packets connected by a lacing wire have been studied. The study was carried out using three analytical and experimental methods. They are: Modal Testing, Electronic Speckle Pattern Interferometry (ESPD and Finite Element Analysis (FEA)). Vibration modes of a turbocharger blade with aerodynamic profile, with and without a lacing wire, were identified using model blades with simplified geometry. The separation of coupled modes was achieved using ESPI tests. The modes of vibrations of bladed packets were identified. The e

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43

Gao, Xunan [Verfasser]. "Model of Aerodynamics and Heat Transfer of a Turbocharger / Xunan Gao." Berlin : epubli, 2019. http://d-nb.info/119968712X/34.

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44

Lee, Samuel P. "Mixed flow turbine housing development for a fixed geometry turbocharger application." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34776/.

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This thesis investigates the impact of volute design on the performance of a mixed flow turbine. Both computational and experimental methods were used to assess performance. All computational work as conducted in CFX under both steady state and unsteady pulsating conditions with the models including inlet, volute, rotor and outlet volumes. Both the mixing plane and sliding mesh approaches were implemented and the results compared. The k-w SST turbulence model was implemented throughout this thesis with the exceptions of chapters 8 and 9 where the SAS SST model was used in an attempt to accurat

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45

Christou, George Alexander. "Fluid mechanics of ported shroud centrifugal compressor for vehicular turbocharger applications." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101492.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 183-187).<br>This thesis presents an investigation of the effects of Ported Shroud (PS) self-recirculating casing treatment used in turbocharger centrifugal compressors for increasing the operable range. Computed results, assessed with experimental measurements on ported and non-ported variants of a representative turbocharger compressor, are used to determine the impact of the PS on the flow field and he

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46

Schmidt, Kristina (Kristina E. ). "After treatment and turbocharger effects on emissions of a diesel engine." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/115455.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>DISCLAIMER NOTICE: The pagination in this thesis reflects how it was delivered to the Institute Archives and Special Collections, Massachusetts Institute of Technology. Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>An experimental study on the effects of after treatments and a turbocharger on emissions of a single cylinder diesel engine. The study measured the concentration of CO, CO2, HC, NO, NO2, and NOx. Tests on the engine were performed at different engine

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Nomura, Paula Watanabe 1983. "Wear analysis of bypass valves applied on regulated-two-stages turbocharger." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265937.

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Orientador: Milton Dias Júnior<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-25T09:48:12Z (GMT). No. of bitstreams: 1 Nomura_PaulaWatanabe_M.pdf: 4842075 bytes, checksum: fb2b3e20baadde947cb7b9aad16227d8 (MD5) Previous issue date: 2014<br>Resumo: As novas legislações de emissões demandam das montadoras de veículos automotores, o desenvolvimento de tecnologias para melhorar o consumo de combustível e emissão de poluentes. Seguindo esta tendência, os sistemas de turbocompressores inovam junto e lançam ao m

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Carroll, Brian R. "Synchronous Thermal Instability Evaluation of Medium Speed Turbocharger Rotor-Bearing Systems." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32886.

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Rotors in fluid-film bearing supported turbomachinery are known to develop elliptical orbits as a result of rotor-bearing interactions, mass unbalance within the rotor, gravitational bending of the shaft and external excitation. In synchronous whirl, where the speed at which the shaft travels about the orbit is equal to the rotational speed of the rotor, temperature gradients may develop across the journal as a result of viscous shear in the bearingâ s lubricant film. This thermal gradient leads to bending of the shaft in a phenomenon known as The Morton Effect. Such thermally induced bend

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Sterling, John Anthony. "Influence of Induced Unbalance on Subsynchronous Vibrations of an Automotive Turbocharger." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33996.

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Rotordynamic instability is present in most or all automotive turbochargers. High subsynchronous amplitudes can cause a variety of problems in areas such as mechanical failures, emissions regulations and rotor design. Self-excited vibrations from sources of damping can lock in at lateral natural frequencies causing dangerously high vibration levels. The resulting high-amplitude conical and bending modes can be reduced in order to achieve a more robust system. This research focuses on the relationship between synchronous and subsynchronous amplitude levels. It is theorized th

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Mondscehin, Brian David. "Evaluation of Alternate Bearing Designs in a High Speed Automotive Turbocharger." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33513.

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Automotive turbochargers experience self-excited instabilities through the majority of their operating speed range. The results of these instabilities can cause damage to the bearings, shafts, and housing walls. Preventing this damage while maintaining or increasing performance characteristics is a huge concern to industry due to the time and money needed to replace vital components. The aim of this research is to determine which characteristics of the bearings have the greatest influence on the damped natural frequencies. It was believed that axial groove bearings could offer an acceptable al

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