Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 385 for “"piston"”.
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Piston ring friction
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Factors affecting piston ring friction
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 …
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Measurement of piston / piston-ring friction and oil film thickness in an internal combustion engine
… investigation of the lubrication of the piston/piston-ring and cylinder liner interface in internal combustion engines. It begins by identifying the relevance of such experimental work and reviews studies carried out by other investigators from the early 1900's to the present day. …
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Oil Transport in Piston Ring Assemblies
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 …
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Spectral functions for generalized piston configurations.
In this work we explore various piston configurations with different types of potentials. We analyze Laplace-type operators P=-g^ij ∇^E_i ∇ ^E_j+V where V is the potential. First we study delta potentials and rectangular potentials as examples of non-smooth potentials and find the spectral zeta …
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Piston slap noise in diesel engines
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1982.
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Air piston approach to wave power generation
… pivot point. This, thereby, raises or lowers a piston, which is attached to the opposite side of the lever through a cylinder, which causes large volumes of air to move. This air is funneled through drive turbines, which produce electric power. This thesis focuses on analyzing the piston and the …
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A Study of the Effects of Piston Secondary Motion on Piston Ring Conformability and Coolant Cavitation in Heavy-Duty Engines
… which are dominated by heavy-duty diesel piston engines, that are more difficult to electrify or decarbonize via other alternatives. Because of this, environmental goals for those transportation modes is on two goals: reducing emissions and improving fuel efficiencies for existing internal …
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Reliability Assessment of Rolling Piston Rotary Type Compressos
… there is a lack of lubrication. In a rolling piston rotary compressor, the most vulnerable regions are the vane and roller contact area, and the shaft and journal bearing area. As the amount of wear increases, leakage through the clearances inside the compression compartment increases as well. …
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Modeling piston skirt lubrication in internal combustion engines
… mechanical losses, to which the friction of the piston skirt is one important contributor. Yet there lacks a sufficient understanding of the skirt lubrication behavior to effectively optimize the piston skirt system in practice. The ultimate goal of this work is to develop a comprehensive model …
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Elements of lubricant transport critical to piston skirt lubrication and to leakage into the piston ring pack in internal combustion engines
… Understanding lubricant transport in the piston-cylinder unit is essential to this mission, due to its direct impact on both types of emissions. The first part of this thesis focuses on the development of an experimental system which allows us to visualize liquid oil transport under …
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An experimental and theoretical study of piston ring lubrication
… 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 …
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Design and testing of experimental free-piston cryogenic expander
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Modeling piston secondary motion and skirt lubrication with applications
… has been given to the frictional losses due to piston and liner interaction, as they represent a significant portion of the total mechanical losses. This thesis work focuses on further development and application of an existing model for the piston's secondary motion and skirt lubrication. Model …
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Modeling of piston pin lubrication in internal combustion engines
The piston pin joins the piston and the connecting rod to transfer the linear force on the piston to rotate the crankshaft that is the eventual power outlet of the engine. The interfaces between the piston pin and the pin bore as well as the connecting rod small end are one of the most heavily …
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Piston ring friction analysis from oil film thickness measurements
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Factors in the Design of Tapered Piston High Pressure Cells
Made available in DSpace on 2014-12-08T23:18:10Z (GMT). No. of bitstreams: 1 6511781.pdf: 2480724 bytes, checksum: b439127b348238ca668bb80481b94753 (MD5) Previous issue date: 1965
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Development and Application of Elastohydrodynamic Lubrication Model for Piston Pin
The piston pin, as the connection between the piston and the connecting rod, is a crucial component in the internal combustion engine. It transfers the cylinder pressure of combustion to the crankshaft and is subjected to high stress and harsh lubrication conditions. Pin seizure is a severe problem …
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Impact analysis of piston slap in a spark ignition engine
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Piston fuel film observations in an optical access GDI engine
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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