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Showing 1 to 20 of 39 for “"Fluid Film"”.
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NUMERICAL INVESTIGATION OF THE PERFORMANCE OF FLUID FILM JOURNAL BEARINGS
This dissertation numerically investigates the performances of both plain journal bearings and herringbone groove journal bearings, with special attention to the latter. The attitude angle, load capacity, stiffness coefficients and damping coefficients are computed. The effects of groove number, …
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An investigation into fluid film lubrication in dynamically loaded bearings
… the computational analysis of ruptured liquid films in both steadily and dynamically loaded bearings. The approach is based on the principle of oil flow continuity. A cavitation algorithm, proposed by H. G. Elrod, was implemented for studies of hydrodynamic lubrication in infinitely long …
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Evaluation of the VPI & SU fluid film bearing test rig
… code for predicting the performance of fluid-film bearings. This work presents an initial evaluation of a test rig for verifying such codes. This presentation includes background information on the techniques and terminology of fluid-film bearing analysis and two basic approaches to …
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Analysis of a Split-Path Gear Train with Fluid-Film Bearings
In the current literature, split path gear trains are analyzed for use in helicopter transmissions and marine gearboxes. The goal in these systems is to equalize the torque in each path as much as possible. There are other gear trains where the operator intends to hold the torque split unevenly. …
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A study on the fluid film of an atomization-based cutting fluid (ACF) spray system during titanium machining
… tool wear. The atomization–based cutting fluid (ACF) spray system has recently been demonstrated to improve tool life during titanium machining. The penetration into the tool–chip interface by means of the thin fluid film created by the ACF spray system appears to be the mechanism by which …
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Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings
Hydrodynamic journal bearings are applied in a wide range of both old and new, advanced rotating machinery designs. To maintain existing machinery, as well as to design new, state of the art machines, validated analytical models for these bearings are needed. This work documents the development and …
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Design of fluid film journal bearings containing continuous 3D fluid pathways which are formed by wrapping a sheet containing 2D through-cut features
… required to: (1) design and manufacture fluid film bearings that do not require precision machining processes during fabrication, but rather gain their precision from off-the-shelf parts used in the fabrication process and (2) manufacture parts with 3D internal networks by wrapping thin …
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A Novel Fluid Structure Interaction and Thermal Model to Predict the Cylinder Block / Valve Plate Interface Performance in Swash Plate Type Axial Piston Machines
… rotating kit of axial piston machines. The thin film of lubricant between cylinder block and valve plate has to fulfill simultaneously a bearing and a sealing function under dynamic load conditions; on the other hand, it represents an important source of power losses due to viscous friction and …
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Model-based nonlinear control of active tilting-pad bearings
… system. The hydrodynamic force produced by the fluid film is modeled as a nonlinear, squeeze-film damper plus repellent spring. A model-based nonlinear controller is then designed to exponentially regulate the rotor position to the origin. A proof-of-concept experiment shows that the active …
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Effect of Rolling on Viscoelastic Fluids Using a Novel Testing Device
… to observe the effect of a rolling motion on the fluid film thickness of different lubricants (motor oil, synovial fluid and Hyaluronic Acid (HA)) to varying loads (1kg, 2,kg, 3kg and 4kg) and speeds (10, 25, 48 and 91 mm/s) applied on the sample fluids for 10 cycles. We were able to examine the …
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Stability Analysis of a Turbocharger for Marine Diesel Engine Service
… same turbocharger is then analyzed with various fluid-film bearing configurations. Finally, the tilting-pad bearing is determined to be the best bearing for this turbocharger application, stabilizing the rotor throughout the entire designed operating range.
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The Effect of Surface Irregularities on The Elastohydrodynamic Lubrication of Sliding Line Contacts
… irregularities on the pressure distribution, film thickness, and subsurface octahedral shear stresses in such contacts. The method is based on the solution of the combined Reynolds and elastic surface displacement integro-differential equation in finite difference form by the Newton-Raphson …
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Liquid cinema and the re-creation of thought: towards a philosophy of filmind
This research is towards the advancement of filmosophy as a progressive new approach to how we think about, and through, film. This explorative research aims to introduce, contextualise, and expand upon the thoughts and writings of Daniel Frampton, as found in his 2006 manifesto: Filmosophy. In …
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NMR-Bildgebung an fallenden Filmen und reaktiven Gelkugeln
… two different systems. The first system was a fluid film running down a vertical plate. The second system was a sphere made from alginate gel in which an enzymatical driven reaction from 1-butanol and propionic acid towards the ester was performed. Theory of the used advanced features of MRI, …
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Thermohydrodynamic analysis of a two axial groove journal bearing including thermoelastic effects
… are used in the finite element model of both the fluid film and the bearing liner. The analytical predictions are compared with the steady load data obtained from two identical 101 mm dia, 57 nm long bearings, one fabricated from steel and the other from bronze. The comparisons are made for …
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Variation in joint fluid composition and its effect on the tribology of replacement joint articulation
… of significant research, the effect of joint fluid on lubrication in the replaced joint has been largely overlooked. Several factors that affect the tribology of metal on polyethylene articulation in joint prostheses stem from the fluid lubricating the joint. In particular, the properties and …
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Computer-Aided Design Software for the Undamped Two-Dimensional Static and Dynamic Analysis of Beams and Rotors
… motions also exists in rotor systems mounted of fluid film bearings. The computer program called 2DBEAM has been developed to model and provide analyses of such systems in two dimensions. The tool has been based on an existing design package, BEAM9, which in its present state provides the …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
This thesis investigates the use of Computational Fluid Dynamics (CFD) to model the formation of soot precursors in modern direct injection gasoline engines, with a particular emphasis on statistically efficient calibration of key sub-models. The research addresses the challenges associated with …
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A Thermoelastohydrodynamic Model of The Morton Effect Operating in Overhung Rotors Supported by Plain or Tilting Pad Journal Bearings
… in overhung rotors that are supported by fluid film bearings and is caused by differential viscous shearing within the bearing lubricant. The Morton Effect has also gained much attention within the last decade. Prior studies of the Morton Effect have used complex analysis in the frequency …
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Synchronous Thermal Instability Evaluation of Medium Speed Turbocharger Rotor-Bearing Systems
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 …
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