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Showing 1 to 20 of 31 for “"Journal Bearing"”.
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Calculations of viscoelastic flow in a journal bearing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1986.
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The oil film in the short journal bearing
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1960
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Analytical and Experimental Investigation of a Full Floating Journal Bearing
Made available in DSpace on 2014-12-10T22:48:11Z (GMT). No. of bitstreams: 1 7121149.pdf: 3399059 bytes, checksum: 7ceb566781d600b3752414d62f321393 (MD5) Previous issue date: 1971
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Design of an internally pressurized aerostatic journal bearing for thermoacoustic engines
In this study an aerostatic journal bearing for reciprocating free pistons was designed for application with thermoacoustic engines. By taking advantage of the maxima and minima of the oscillating pressures inside the engine's cavity, the bearing does not rely on external pressurization by a pump, …
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Thermohydrodynamic analysis of a two axial groove journal bearing including thermoelastic effects
… influence on the dynamic characteristics of a journal bearing is the thermal deformation of the bearing surface and the journal. Although a few reported research projects consider this effect, most of the journal bearing codes currently utilized in the turbomachinery industry ignore this …
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Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing
… and damping coefficients for tilting-pad journal bearings (TPJBs) to measurements. Most have found that direct damping is consistently overpredicted. The thrust of this research is to explain the difference between measured and predicted stiffness and damping coefficients for TPJBs, and to …
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Test Results for Shaft Tracking Behavior of Pads in a Spherical Pivot Type Tilting Pad Journal Bearing
Most tilting pad journal bearing dynamic characteristics estimation methodologies assume perfect shaft tracking by the pads. In other words, they neglect pivot friction. In case of pads having point or line contact that operate under most normal load conditions, the pad tilting is due to a rocking …
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Static, dynamic and levitation characteristics of squeeze film air journal bearing: Designing, modelling, simulation and fluid solid interaction
Bearings today need to be able to run at very high speed, providing high positional accuracy for the structure that it supports, and requiring very little or no maintenance. For this to happen, bearings must have tight tolerances and very low or zero friction during operation. This pushes many …
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A survey of cylindrical bearing practice of the United States
… important points will be brought out. (a) The journal bearing is one of the most important elements of machinery. (b) An outline of the fundamentals of oiling and grooving bearings has been given. The bearing metals and the lubricants in use today and the functions of the lubricating engineer …
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Design, fabrication, experimentation and analysis of high-speed microscale gas bearings
… stack. Of note are the low aspect ratio journal bearing and large journal bearing clearances, primarily limited by microfabrication, from which stable bearing operation must first be demonstrated as viable. Theoretical modeling of the gas-lubricated hydrostatic journal bearing presents …
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MEMS turbomachinery rotordynamics : modeling, design and testing
… lies in the stable operation of the bearings supporting the high-speed rotating machinery. This thesis presents the analysis, design, microfabrication, testing and operation of high speed micro-hydrostatic gas bearings for microturbomachinery in power-MEMS applications. A novel …
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A study of the dynamic loading of hydrodynamically lubricated journal bearings
… presented here examined the response of a full journal bearing to a unidirectional dynamic load. Frequency response of the bearing at different eccentricity ratios was investigated. It was concluded that the response of the bearing varies with eccentricity. The experimental data obtained was …
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Preliminary performance characteristics of a microfabricated turbopump
… to both the turbomachinery as well as the bearing systems for these preliminary tests is shown and discussed. The pressure rise through the pump, turbine pressure ratio, respective powers, and a system efficiency are presented. Bearing theory and static flow test data are discussed. The …
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Rocking and rolling down an incline : the dynamics of nested cylinders on a ramp
… experimental and theoretical investigation of a journal bearing, specifically, a cylinder suspended in a viscous fluid housed within a cylindrical shell, rolling down an incline under the influence of gravity. Particular attention is given to rationalizing the distinct modes of motion observed. …
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Macro-scale investigation of high speed gas bearings for MEMS devices
… test facility for investigating high-speed gas bearings for MEMS devices such as the MIT Micro-Engine is presented along with results from subsequent experiments. It is shown that the bearings required by such MEMS devices fall outside the usual range of design parameters for conventional gas …
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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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A microfabricated ElectroQuasiStatic induction turbine-generator
… rotor, 4 mm in diameter, is supported on gas bearings. The thrust bearings are formed by a shallow etch of 1.5 [mu]m to define the thrust bearing gap. Thrust bearing pressurization is through 10 [mu]m diameter nozzles, etched 100 [mu]m deep. The journal bearing is a precision, ... wide, 300 …
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