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Teses / dissertações sobre o tema "Piston ring"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Liao, Kai Ph D. Massachusetts Institute of Technology. "Factors affecting piston ring friction." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82499.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2013.<br>This thesis was scanned as part of an electronic thesis pilot project.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 153-156).<br>The piston ring pack friction is a major contributor to the internal combustion engine mechanical friction loss. The oil control ring decides the oil supply to the top two rings in addition to being the major friction contributor in the ring pack. This work concentrated on the oil control ring friction. A large range of ring l

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2

Johansson, Pontus. "New piston ring solution for Stirling engines." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75236.

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3

Ostovar, Pendar. "Fluid aspects of piston-ring lubrication." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324316.

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4

Dhunput, Ashvin. "Oil transport in piston ring assemblies." Thesis, City University London, 2009. http://openaccess.city.ac.uk/11916/.

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The interface between the piston, piston-rings and the cylinder liner represents one of the most hostile environments the crankcase lubricant experiences in reciprocating engines. The role of piston rings is also becoming more complex in line with the increasing requirements for lower oil consumption and friction. A test rig has been developed to simulate under idealised conditions the lubrication action between the piston-ring and the cylinder-liner in reciprocating engines. This approach attempts to separate the tribological conditions from some of the fundamental and unsteady conditions occ

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5

Söderfjäll, Markus. "Friction in Piston Ring - Cylinder Liner Contacts." Doctoral thesis, Luleå tekniska universitet, Maskinelement, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62155.

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With today’s striving towards reduction of fuel consumption it is moreimportant than ever to understand the function of different componentsin the internal combustion engine. There is a need to develop and usetools to investigate and predict the result of specific design changesmade on the components. In this work, the mechanics and the tribologyof the power cylinder unit and more specifically the operation of thepiston rings was investigated both numerically and experimentally. Theobjectives of the numerical part of this thesis were to develop simulationtools that can be used to quantify desi

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6

Nataraja, H. S. "Improvement Of Piston Ring Quality : A Case Study." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/198.

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Automobiles have become an integral part of our daily life as more and more mopeds, motor cycles, cars, trucks, busses and trains are being used for transport. The main parts of an automotive engine are cylinder, piston assembly, connecting rod and crank shaft. The piston assembly consists of Piston, Piston rings and Piston Pin. Piston rings are important parts of a piston assembly. Any non-conformance in any quality characteristic of the piston ring leads to deterioration of engine performance. M/S Goetze (India) Limited a medium scale industry and a sister concern of engineering giant M/S

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7

Nataraja, H. S. "Improvement Of Piston Ring Quality : A Case Study." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/198.

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Automobiles have become an integral part of our daily life as more and more mopeds, motor cycles, cars, trucks, busses and trains are being used for transport. The main parts of an automotive engine are cylinder, piston assembly, connecting rod and crank shaft. The piston assembly consists of Piston, Piston rings and Piston Pin. Piston rings are important parts of a piston assembly. Any non-conformance in any quality characteristic of the piston ring leads to deterioration of engine performance. M/S Goetze (India) Limited a medium scale industry and a sister concern of engineering giant M/S E

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8

Esmaili, Mahyar. "Development and implementation of an apparatus for polymeric piston-ring performance tests in controlled environment." Ohio : Ohio University, 1993. http://www.ohiolink.edu/etd/view.cgi?ohiou1175286117.

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9

Grice, Neil. "An experimental and theoretical study of piston ring lubrication." Thesis, University of Central Lancashire, 1990. http://clok.uclan.ac.uk/20520/.

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The work presented in this thesis is concerned with developing a greater understanding of piston ring lubrication and consists of both experimental and theoretical components. It begins with a review of piston ring and ring pack lubrication studies, describing how the understanding of the operation of piston rings has progressed since the late 19th Century. A well-established method of analysing the hydrodynamic lubrication of a single piston ring, utilizing coordinate data to describe the ring face profile, is then presented. Calculation of mixed/boundary friction, when the lubricant film thi

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10

Pyke, Edward A. "Investigation of piston ring lubrication using laser induced fluorescence." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325773.

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11

Deutsch, Eric J. (Eric Joseph). "Piston ring friction analysis from oil film thickness measurements." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36435.

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12

Akurati, Parthasri, and Karan Kumar. "Development of a 3D Ring Dynamics Model For a Heavy-Duty Piston Ring-Pack." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21638.

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With the increasing restrictions in emission legislations, the automotive industry aims to improve the efficiency of the lubricating system and to decrease fuel consumption. In the power cylinder unit (PCU), the piston rings are the major contributor to these consumptions. Hence, focus on the dynamic behaviour of the rings to reduce lube oil consumption (LOC) becomes a key factor in thriving towards sustainability. Several studies have been conducted on the piston ring-pack specifically using a 2D ring dynamics approach. This study focuses on developing a 3D ring dynamics model, in the softwar

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13

Mishra, Prakash Chandra. "Transient thermo elastohydrodynamics of piston compression ring-cylinder liner contact." Thesis, Loughborough University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547397.

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14

Skytte, af Sätra Ulf. "Wear of piston rings in hydrostatic transmissions." Doctoral thesis, KTH, Machine Design (Div.), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-432.

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<p>This study focuses on the wear of piston rings in a hydraulic radial piston motor. The piston ring has to satisfy increasing demands for reliability and longer service life. It has two contacting surfaces, the face and the flank, and operates under a boundary lubrication state.</p><p>This first part of the project aimed to detect and characterise piston ring wear. Measurement by weighing gives an overall value for wear defined as loss of mass. Two-dimensional form and surface roughness measurements show the distribution of wear on the piston ring face in contact with the cylinder bore and t

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15

Bouassida, Hafedh. "Lubricated piston ring cylinder liner contact : Influence of the liner microgeometry." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0088/document.

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La microgéométrie de la surface de la chemise joue un rôle très important dans les pertes par frottement et dans la consommation de l’huile dans un moteur à combustion interne. Une des texturations classiques de cette surface est celle créée par pierrage. Elle se compose de plateaux plus ou moins lisses et de profondes stries croisées. L’´épaisseur du film d’huile est influencée fortement par cette texturation. Un modèle simplifié du contact segment chemise a été créé en la présence de la microgéométrie. Puis, un code de calcul basé sur la méthode numérique multigrille a été développé. Ce code

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16

Smedley, Grant 1978. "Piston ring design for reduced friction in modern internal combustion engines." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/27129.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (p. 113-115).<br>Piston ring friction losses account for approximately 20% of the total mechanical losses in modern internal combustion engines. A reduction in piston ring friction would therefore result in higher efficiency, lower fuel consumption and reduced emissions. The goal of this study was to develop low-friction piston ring designs to improve engine efficiency, without adversely affecting oil consumption, blowby, wear, or cost. These are desirable objecti

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17

Bush, Graham Peter. "An investigation into piston ring blowby and its effect on biogas engines." Thesis, De Montfort University, 1986. http://hdl.handle.net/2086/10683.

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This study has investigated the severe corrosion of Biogas engines by the blowby gases. The formation of blowby its composition and flow rate have been measured and simulated. The nature of the piston ring sealing, lubrication and breakdown has been examined. A study of Biogas engines showed that Copper corrosion of the small end and camshaft bearings by HZS gas was the reason for engine failure. H2S is present in all Biogas at a concentration of usually less than 1%, but succeeds in chemical attack despite its good combustion properties, and the expected reaction with the bases present in the

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18

Bhouri, Mohamed Aziz. "Curved beam based model for piston-ring designs in internal combustion engines." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/111772.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 169-173).<br>Characterizing the piston ring behavior is inherently associated with the oil consumption, friction, wear and blow-by in internal combustion engines. This behavior varies along the ring's circumference and determining these variations is of utmost importance for developing ring-packs achieving desired performances in terms of sealing and conformability. This study based on straight beam model was alr

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19

Tian, Tian. "Modeling the performance of the piston ring-pack in internal combustion engines." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10445.

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20

Bhouri, Mohamed Aziz. "Curved beam based model for piston-ring designs in internal combustion engines." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111772.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 169-173).<br>Characterizing the piston ring behavior is inherently associated with the oil consumption, friction, wear and blow-by in internal combustion engines. This behavior varies along the ring's circumference and determining these variations is of utmost importance for developing ring-packs achieving desired performances in terms of sealing and conformability. This study based on straight beam model was alr

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21

Sautermeister, Falko Alexander. "Piston ring lubrication-influence of sulphuric acid formation from high sulphur content fuel." Thesis, University of Leeds, 2012. http://etheses.whiterose.ac.uk/3132/.

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Large 2-stroke marine diesel engines burn high sulphur content residual fuel. The sulphur converts to aqueous sulphuric acid, H2SO4, and condenses on the cylinder liner surface, where it causes corrosive attack when not neutralised by the high alkaline reserve in the lubricant. Cylinder liner wear and deposit formation are observed to reflect poor lubricant distribution, surface temperature and sulphur fuel content, which all influence acid concentration. Currently neglected by the industry, is the catalysing action of H2SO4 on lubricant degradation and the rheology of entrained droplets in th

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22

Edwards, Paul Simon. "The contribution of piston ring packs and cylinder bore distortion to engine friction." Thesis, University of Leeds, 1992. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667750.

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23

Vasilakos, I. "Cavitation in the cylinder-liner and piston-ring interaction in internal combustion engines." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/19265/.

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The emissions control regulations introduced by governments are set to improve the quality of the engines and reduce the impact automobiles have on the planet. The regulations imposed on the manufactures have proven very difficult to meet, with some of the leading names in the industry investing significant part of their funding in research and development. Their goal is to reduce the fuel consumption and exhaust emissions while increasing the engine performance and durability. The piston-ring and cylinder-liner interaction is the major source of frictional losses for reciprocating internal co

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24

RAZAVYKIA, ABBAS. "Modeling of Piston Ring Assembly and Connecting Rod Bearing Lubrication and Tribological Performance." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2735172.

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25

Noutary, Marie-Pierre. "A robust Reynolds solver for textured surfaces in the piston ring cylinder liner contact." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI105/document.

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Le contact Segment-Piston-Chemise (SPC) est essentiel pour la réduction des émissions de CO2 et de polluants dans les moteurs automobile. Pour optimiser ces deux contraintes antagonistes, il est nécessaire d’étudier l’influence de la microgéométrie afin de trouver de nouvelles architectures de ce contact. L’étude expérimentale étant très coûteuse, il est impératif de pouvoir modéliser les performances du contact SPC. Les méthodes multigrilles permettent de réduire considérablement les temps de calcul. Pour le contact SPC, les méthodes multigrilles classiques perdent leur efficacité en présence

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26

Wang, Yuan S. M. Massachusetts Institute of Technology. "Air flow effects in the piston ring pack and their implications on oil transport." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76826.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2012.<br>This thesis was scanned as part of an electronic thesis pilot project.<br>Cataloged from PDF version of thesis. This thesis was scanned as part of an electronic thesis pilot project.<br>Includes bibliographical references (p. 85).<br>3 different flow regimes of piston blowby air and their influences on oil transport are studied. It is found that air mainly interacts with oil close to the ring gaps and directly below the ring-liner contacts. Geometric features at the gaps to smoothen airflow an

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27

Zhou, Qing. "Friction and wear of piston ring : cylinder liner contact in a large marine diesel engine." Thesis, Brunel University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393177.

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28

Senzer, Eric B. "Piston ring pack design effects on production spark ignition engine oil consumption : a simulation analysis." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42309.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (p. 113-115).<br>One of the most significant contributors to an engine's total oil consumption is the piston ring-pack. As a result, optimization of the ring pack is becoming more important for engine manufacturers and lubricant suppliers. This leads to current efforts to control the oil transport and flow through the ring pack. Decreasing the amount of oil needed for proper lubrication while minimizing, frictional losses are the goals of such research. The hope i

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29

Jocsak, Jeffrey (Jeffrey Alan). "The effect of surface finish on piston ring-pack performance in advanced reciprocating engine systems." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32371.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.<br>Includes bibliographical references (p. 93-95).<br>Frictional losses in the piston ring-pack of an engine account for approximately 20% of the total frictional losses within an engine. Methods of surface texture optimization were investigated to reduce piston ring-pack friction and increase engine brake thermal efficiency. Adverse effects of surface texture optimization on engine oil consumption and durability were also considered. Although many non-conventional cylinder liner finishes are now being

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30

Papadopoulos, Panagiotis. "Investigation of fundamental wear mechanisms at the piston ring/cylinder wall interface in internal combustion engines." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435922.

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31

Thomson, Andrew Lee. "An accelerated method to assess lubricant degradation in the piston ring zone of spark ignition engines." Thesis, De Montfort University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391035.

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32

Baelden, Camille. "A multi-scale model for piston ring dynamics, lubrication and oil transport in internal combustion engines." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92151.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 215-218).<br>Fuel consumption reduction of more than 20% can be achieved through engine friction reduction. Piston and piston rings contribute approximately half of the total engine friction and are therefore central to friction reduction efforts. The most common method to reduce mechanical losses from piston rings has been to lower ring tension, the normal force providing sealing between the piston ring and th

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33

Chen, Haijie. "Modeling the lubrication of the piston ring pack in internal combustion engines using the deterministic method." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67578.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 131-133).<br>Piston ring packs are used in internal combustion engines to seal both the high pressure gas in the combustion chamber and the lubricant oil in the crank case. The interaction between the piston ring pack and the cylinder bore contributes substantially to the total friction power loss for IC engines. The aim of this thesis work is to advance the understanding of the ring liner lubrication through numerica

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34

Vokac, Adam 1978. "An experimental study of the oil evolution in critical piston ring pack regions and the effects of piston and ring designs in an internal combustion engine utilizing two-dimensional laser induced fluorescence and the impact on maritime economics." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/27132.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2004.<br>Includes bibliographical references (p. 191-194).<br>Faced with increasing concern for lubricating, oil consumption and engine friction, it is critical to understand the oil transport mechanisms in the power cylinder system. Lubricating oil travels through distinct regions along the piston ring pack before being consumed in the combustion chamber, with the oil distribution and dominant driving forces varying substantiall

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35

Casey, Steven M. (Steven Michael) 1971. "Analysis of lubricant film thickness and distribution along the piston-ring/liner interface in a reciprocating engine." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/31075.

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36

Douglas, Ryan McAllister. "Monitoring of the piston ring-pack and cylinder liner interface in diesel engines through acoustic emission measurements." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/2140.

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Investigation of novel condition monitoring systems for diesel engines has received much recent attention due to the increasing demands placed upon engine components and the limitations of conventional techniques. This thesis documents experimental research conducted to assess the monitoring capabilities of Acoustic Emission (AE) analysis. In particular it focuses on the possibility of monitoring the piston ring-pack and cylinder liner interface, a critical engine sub-system for which there are currently few practical monitoring options. A series of experiments were performed on large, two-str

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37

Zhang, Qin Ph D. Massachusetts Institute of Technology. "Fast modeling of multi-phase mixture transport in piston/ring/liner system via GAN-augmented progressive modeling." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129038.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2020<br>Cataloged from student-submitted PDF of thesis.<br>Includes bibliographical references (pages 177-183).<br>As a continued effort to advance the understanding of the power cylinder system and design capacities, we develop a modeling framework for multi-phase macro mixture transport that integrates all length scales, time scales and flow regimes using a hybrid approach combining deterministic modeling and machine learning. This framework considers various mechanical and physical processes includi

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38

Avan, Emin Yusuf. "Development of a novel ultrasonic method for non-invasive measurement of oil films in piston ring contacts." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/3949/.

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39

Nadeem, Tariq. "Computer simulation of the steady-state thermodynamic processes and piston ring wear for a multi-stage intercooled reciprocating air compressor." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43257.

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The objectives of this research are the prediction of the thermodynamic behavior of a multi-stage intercooled reciprocating compressor and its progressive loss of performance due to leakage. A theoretical model is developed to simulate the thermodynamics of the compressor system and the lubricating condition and wear of the piston ring pack for a multi-stage intercooled reciprocating compressor. A first law of thermodynamics approach is used to determine the thermodynamic properties of the gas inside the cylinders, the intercoolers and the inlet and discharge manifold. The compressor valves ar

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40

Elfridsson, Jon. "3D parameterized FEM modelling of a piston ring in a marine diesel engine : a simulation approch using FEM." Thesis, Umeå universitet, Institutionen för fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-38315.

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The piston ring in a marine two-stroke diesel engine operates in demanding conditions, involving high temperatures and pressures. Its main purposes are to seal the combustion chamber of the engine, minimize the frictional contact against the cylinder liner and transfer heat from the piston. The development of new piston ring designs for marine diesel engines is mainly based on engineering knowledge and expertise but is somewhat unstructured. A new method which may be used to overcome this lack of structure is to simulate the working conditions for the piston ring. This is the main objective of

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41

Wei, Nasha. "The investigation into the condition monitoring of tribological behaviour between piston ring and cylinder liner using acoustic emissions." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34761/.

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To improve engine operational performance and reliability, this study focuses on the investigation into the behaviour of tribological conjunction between the ring - liner based on a comprehensive analysis of non-intrusive acoustic emission (AE) measurement. Particularly, the study will provide more knowledge of using AE for online monitoring and diagnosing the performances of the conjunction. To fulfil this study, it integrates analytical predictions of the theoretical modelling for the AE generation mechanism with extensive experimental evaluations. Moreover, effective signal processing techn

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42

Zhao, Qing Ph D. Massachusetts Institute of Technology. "Modeling of contact between liner finish and piston ring in internal combustion engines based on 3D measured surface." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92105.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 87-88).<br>When decreasing of fossil fuel supplies and air pollution are two major society problems in the 21st century, rapid growth of internal combustion (IC) engines serves as a main producer of these two problems. In order to increase fuel efficiency, mechanical loss should be controlled in internal combustion engines. Interaction between piston ring pack and cylinder liner finish accounts for nearly 20 perc

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43

Fang, Tianshi. "Fluid mechanics of lubricant transport in non-contact regions in the piston ring pack in internal combustion engines." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122218.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 175-177).<br>The compromise between friction and lubricant consumption has been a long-lasting challenge for the design of the piston ring pack in internal combustion engines. In order to achieve a satisfactory compromise, a systematic understanding of the lubricant transport in the piston ring pack is of critical importance. In the context of increasingly stringent standards on engine emissions, there is a more

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44

Cho, Yeunwoo 1973. "Modeling engine oil vaporization and transport of the oil vapor in the piston ring pack on internal combustion engines." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30302.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Page 172 blank.<br>Includes bibliographical references (p. 129-130).<br>A model was developed to study engine oil vaporization and oil vapor transport in the piston ring pack of internal combustion engines. With the assumption that the multi-grade oil can be modeled as a compound of several distinct paraffin hydrocarbons, a set of equations governing the oil vapor density variations were derived by applying the mass conservation law to the amount of oil vaporized from the piston and the amount of oi

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45

Noordzij, L. Bouke. "Measurement and analysis of piston inter-ring pressures and oil film thickness and their effects on engine oil consumption." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10925.

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46

Thirouard, Benoist (Benoist Pierre) 1972. "Characterization and modeling of the fundamental aspects of oil transport in the piston ring pack of internal combustion engines." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8890.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.<br>"June 2001."<br>Includes bibliographical references (p. 253-257).<br>Engine oil consumption is one of the primary interests for the automotive industry in controlling emissions and reducing service cost. Due to a lack of understanding of the mechanisms of oil transport along the piston, reducing oil consumption from the ring pack of internal combustion engines has been extremely challenging for engine manufacturers and suppliers. This work addressed the fundamental aspects of oil transport in the p

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Liu, Yang Ph D. Massachusetts Institute of Technology. "Developing an approach utilizing local deterministic analysis to predict the cycle friction of the piston ring-pack in internal combustion engines." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82299.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 107-109).<br>Nowadays, a rapid growth of internal combustion (IC) engines is considered to be a major contributor to energy crisis. About 20% of the mechanical loss in internal combustion engines directly goes to the friction loss between piston ring pack and liner finish. A twin-land oil control ring (TLOCR) deterministic model was developed by Chen et al. and it helps the automotive companies investigate the effects o

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Sochting, Sven. "The effects of operating conditions on the hydrodynamic lubricant film thickness at the piston-ring/cylinder liner interface of a firing diesel engine." Thesis, University of Central Lancashire, 2009. http://clok.uclan.ac.uk/21027/.

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Conventional investigations into the performance of piston-rings in internal combustion engines are performed at relatively low speeds and consider only steady state operation conditions. Loss of power in internal combustion (IC) engines is becoming an increasing issue when they are operated at high engine speeds. This project is directed at developing technology to establish whether this phenomenon is influenced by a lubricant related effect. In a normal operating environment automotive engines typically operate under transient operating conditions. These rapid changes in operation conditions

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Liu, Liang 1971. "Modeling the performance of the piston ring-pack with consideration of non-axisymmetric characteristics of the power cylinder system in internal combustion engines." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30336.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.<br>Includes bibliographical references (p. 139-143).<br>The performance of the piston ring-pack is directly associated with the friction, oil consumption, wear, and blow-by in internal combustion engines. Because of non-axisymmetric characteristics of the power cylinder system, the performance of a ring varies along its circumference. Investigating these variations is of great interest for developing advanced ring-packs, but is out of the capabilities of the existing two-dimensional models. In this w

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Skoupý, Jiří. "Pohon regulačního kruhu PVE Merkersbach." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228065.

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This thesis is focused on determination of forces acting to regulation ring of water power plant Markersbach (Germany). Solution of the problem is realized for two variants of servomotors – with and without servomotors acting surfaces balancing. Next topics of this thesis are strenght calculation of piston rod and bottom of the servomotors. Minimalization of the size of servomotors plungers by change of regulation kinematics has been done and minimal pressure in the pressure tank is determined. At the conclusion of this thesis received results are mentioned and its interpretation has been done

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