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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"hydrodynamic lubrication"”.
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Investigation of surface waves on hydrodynamic lubrication
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Friction characteristics of microtextured surfaces under hydrodynamic lubrication
… to predict the texture-induced lift. During hydrodynamic lubricated sliding, the textured surfaces exhibit friction as much as 80% lower than the untextured surfaces. We study the effect of operating conditions on the friction performance of the surfaces for different textures. The trends …
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A fast algorithm for approximating hydrodynamic lubrication interactions between elastic particles
Made available in DSpace on 2010-08-20T17:56:31Z (GMT). No. of bitstreams: 3 Higa_Kenneth.pdf: 2312620 bytes, checksum: ec5ce7a5b2725293e6f6bfeb9258614c (MD5) 1_Higa_Kenneth.pdf: 2312665 bytes, checksum: aef11826adce2877b64cc45c9460c85f (MD5) license.txt: 4059 bytes, checksum: …
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Hydrodynamic lubrication and coating of wire using a polymer melt during drawing process.
… the Christopherson tube is investigated for the lubrication and other effects of employing a polymer melt as the lubricant during the wire drawing process. The device is heated to convert the polymer feed into a viscous melt and the pressure required is generated by a hydrodynamic action produced …
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Investigation of a contact resonance atomic force microscopy scan speed phenomenon
… AFM phenomenon and applies a squeeze film hydrodynamic lubrication model to explain it. Contact-resonance spectroscopy is used to investigate the phenomenon in which, above a critical scan speed, there is a monotonic decrease in the measured contact-resonance frequency with increasing scan …
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Lubrication in the ball and socket joint of a swash plate mechanism
… rod in a swash plate engine is studied in the hydrodynamic regime. The engine operates at 1390rpm with an axial load on the rod as high as 1 x 10⁴N. The instantaneous load and kinematics from a previous study for a swash plate engine was used as the input. The ball and socket were assumed to be …
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An investigation into fluid film lubrication in dynamically loaded bearings
… by H. G. Elrod, was implemented for studies of hydrodynamic lubrication in infinitely long cylinder/plane bearings (i.e. non-conformal contacts) under combined sliding, rolling and normal motion. Difficulties involved in the implementation of this algorithm were investigated in great depth. A …
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Developing an approach utilizing local deterministic analysis to predict the cycle friction of the piston ring-pack in internal combustion engines
… to the experimental results. A top-two-ring lubrication cycle model was developed based on the multiphase deterministic model by Li. et al [30] and previous top-two-ring lubrication model by Chen. Et al [2][31]. The model is composed with two parts. First, the deterministic model is used to …
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Development and Application of Elastohydrodynamic Lubrication Model for Piston Pin
… and is subjected to high stress and harsh lubrication conditions. Pin seizure is a severe problem in new engine development and coatings could be a solution to this problem. However, by advancing the knowledge about the lubrication effect and the contact patterns on the pin’s surface, it is …
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Intricate dynamics and hydrodynamic frictional losses of the piston-ring assembly in internal combustion engines
… that predicts the intricate dynamics and lubrication regimes of the piston-assembly under various engine operating conditions. The current formulation considers the interconnected motions of the crankshaft, the connecting-rod, the piston (both primary and secondary motions), and the …
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Effects of piston design and lubricant selection on reciprocating engine friction
… on engine efficiency. The model incorporated hydrodynamic, boundary, and mixed lubrication modes, and it allowed for either fully-flooded or partially-flooded skirts. It also considered the effects of skirt deformation in response to applied loads. A dominant factor influencing net friction …
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Development of a multi-regime tribometer and investigation of zinc dialkyldithiophosphate tribofilm development in the presence of overbased calcium sulfonate
… was designed to operate in various conditions of lubrication severity, from boundary to hydrodynamic lubrication regimes. A cylinder-on-plate layout, in which a cylinder rotates and rubs against a plate in a line contact, was employed for this purpose. ZDDP, a wear preventative additive …
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The rheology and flow behaviour of high concentration mineral slurries
… Friction Factors - takes into account the hydrodynamic lubrication between the solid particles and the tube wall. The existence of a thin layer of liquid at the wall is credible but not yet proven. The anomalous behaviour is linked to this layer. However a suitable method for correcting the …
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A tribological study of the interaction between surface micro texturing and viscoelastic lubricants
… to obtain a Stribeck diagram that spans the lubrication regimes from boundary lubrication to hydrodynamic lubrication. Each lubricant/surface pair results in a unique curve that is subsequently compared to other lubricant/surface pairs in order to study the effect of different surface …
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Computer simulation of the steady-state thermodynamic processes and piston ring wear for a multi-stage intercooled reciprocating air compressor
… piston ring pack are determined on the basis of hydrodynamic lubrication theory. The wear of the piston rings is assumed to occur when the hydrodynamic oil film between the piston ring and cylinder bore breaks down. Based on the theoretical model, a computer program is developed. This program is …
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Finite element modelling of fatigue crack growth in multi-layered architectures
… of the service conditions, based on the Elasto-Hydrodynamic Lubrication pressure, and manufacturing processes, mainly related to the forming of a concave shell, was developed for plain bearings as the initial step of a damage tolerance analysis.
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An experimental and theoretical study of piston ring lubrication
… 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 …
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Analysis of parasitic losses in heavy duty diesel engines
… region. In the mid-stroke, the piston is in the hydrodynamic lubrication regime, and high surface speeds generate the majority of the power cylinder work losses which can be reduced through reduced lubricant viscosity. By coating the liner in selected regions only, top dead center temperatures …
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Rolling contact orthopaedic joint design
… million cycles during the first round of tests. Lubrication in the joint is also considered: micro- and nano-textured porous coatings are investigated for their potential to support the formation of favorable lubrication regimes. Hydrodynamic lubrication is optimal, as two surfaces are separated …
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