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Measurements Versus Predictions For A Hybrid Hydrostatic Plus Hydrodynamic Thrust Bearing For A Range Of Orifice Diameters
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Book Synopsis Measurements Versus Predictions for a Hybrid (hydrostatic Plus Hydrodynamic Thrust Bearing for a Range of Orifice Diameters by : Paul R. Esser
Download or read book Measurements Versus Predictions for a Hybrid (hydrostatic Plus Hydrodynamic Thrust Bearing for a Range of Orifice Diameters written by Paul R. Esser and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A fixed geometry hybrid thrust bearing is investigated with three different supply orifice diameters. The test rig uses a face-to-face thrust bearing design, with the test bearing acting as the rotor loading mechanism. A hydraulic shaker applies the static axial load, which is reacted by a second thrust bearing. The rotor is supported radially by two water-lubricated fluid film journal bearings and is attached to a 30,600 rpm motor via a high speed coupling with very low axial stiffness. Thrust bearings with three different orifice diameters (1.63, 1.80, and 1.93 mm) are tested for a range of supply pressures, fluid film thicknesses, and rotational speeds. The water-lubricated test bearings have eight pockets, with feed orifices located centrally in each pocket. Experimental results are comparted to predictions found using bulk flow model HYDROTHRUST. Analysis of the data reveals generally good agreements between predictions and measurements. Thrust-bearing inlet supply and inner radius flow rates all decreased with decreasing orifice diameters and bearing axial clearances. In most cases, the bearings with larger orifice diameters exhibit higher recess pressure ratios, operating clearances, and flow rates. The largest orifice diameter configuration does not display higher recess pressure ratios or operating clearances at high speeds for some supply pressures, but it does continue to require additional lubricant flow rate compared to the smaller orifice bearings. In these cases, the results are not reflected in predictions, which otherwise correlate very well with experimental measurements. Estimations of static loading axial stiffness are obtained using experimental results. An optimum hybrid thrust bearing orifice diameter will depend on the conditions of individual applications. Larger orifices generally provide larger operating clearances and higher stiffnesses, but also require higher flow rates. For most applications, a compromise of bearing performance parameters will be desired. The test results and comparisons presented will aid in sizing orifice diameters for future hybrid thrust bearing designs.
Book Synopsis Predicted Characteristics of an Optimized Series-hybrid Conical Hydrostatic Ball Bearing by :
Download or read book Predicted Characteristics of an Optimized Series-hybrid Conical Hydrostatic Ball Bearing written by and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of a Series Hybrid Thrust Bearing at DN Values to Three Million. 2: Fabrication and Testing by : M. Eusepi
Download or read book Evaluation of a Series Hybrid Thrust Bearing at DN Values to Three Million. 2: Fabrication and Testing written by M. Eusepi and published by . This book was released on 1975 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Predicted and Measured Friction for a Tilt-Pad Thrust Bearing with Crown and Roughness Under Hydrodynamic and Mixed Lubrication by : T. L. Daugherty
Download or read book Comparison of Predicted and Measured Friction for a Tilt-Pad Thrust Bearing with Crown and Roughness Under Hydrodynamic and Mixed Lubrication written by T. L. Daugherty and published by . This book was released on 1984 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a controlled experiment on a tilt-pad thrust bearing having measured surface crown and longitudinal roughness, the frictional results were compared with results predicted by a physico-mathematical model of the bearing. The bearing operated hydrodynamically using 2190 TEP oil at ambient and 150 F bulk temperature under loads approaching 500 psi.
Book Synopsis Evaluation of a Series Hybird Thrust Bearing at DN Values to Three Million. 1: Analysis and Design by :
Download or read book Evaluation of a Series Hybird Thrust Bearing at DN Values to Three Million. 1: Analysis and Design written by and published by . This book was released on 1974 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Vs. Theoretical Characteristics of a High Speed Hybrid (combination Hydrostatic and Hydrodynamic) Bearing by : Kurt Alan Kurtin
Download or read book Experimental Vs. Theoretical Characteristics of a High Speed Hybrid (combination Hydrostatic and Hydrodynamic) Bearing written by Kurt Alan Kurtin and published by . This book was released on 1990 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Dudgeon, E. H Publisher :National Research Council of Canada, Division of Mechanical Engineering ISBN 13 : Total Pages :60 pages Book Rating :4.:/5 (227 download)
Book Synopsis Performance Factors for Circular, Hydrostatic, Gas-lubricated Thrust Bearings : Part II, Multiple Inlet Thrust Bearings by : Dudgeon, E. H
Download or read book Performance Factors for Circular, Hydrostatic, Gas-lubricated Thrust Bearings : Part II, Multiple Inlet Thrust Bearings written by Dudgeon, E. H and published by National Research Council of Canada, Division of Mechanical Engineering. This book was released on 1970 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Procedures are described for the design of both orifice-compensated and inherently-compensated hydrostatic gas thrust bearings. A new empirical correlation for the compensation loss in inherently-compensated bearings is presented. The analytical predictions are compared with experimental results for a number of different single inlet thrust bearings over a range of parameters. The proposed design method is general and can be applied, using appropriate load factors, to multiple inlet thrust bearings. (Author).
Book Synopsis Fundamentals of Fluid Film Lubrication by : Bernard J. Hamrock
Download or read book Fundamentals of Fluid Film Lubrication written by Bernard J. Hamrock and published by CRC Press. This book was released on 2004-03-15 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specifically focusing on fluid film, hydrodynamic, and elastohydrodynamic lubrication, this edition studies the most important principles of fluid film lubrication for the correct design of bearings, gears, and rolling operations, and for the prevention of friction and wear in engineering designs. It explains various theories, procedures, and equations for improved solutions to machining challenges. Providing more than 1120 display equations and an introductory section in each chapter, Fundamentals of Fluid Film Lubrication, Second Edition facilitates the analysis of any machine element that uses fluid film lubrication and strengthens understanding of critical design concepts.
Book Synopsis Hydrostatic and Hydrodynamic Lubrication Analysis of Large Spring-supported Thrust Bearings with Finite Element Analysis of Pad Deflection by : Andrea Lynn Brown
Download or read book Hydrostatic and Hydrodynamic Lubrication Analysis of Large Spring-supported Thrust Bearings with Finite Element Analysis of Pad Deflection written by Andrea Lynn Brown and published by . This book was released on 2001 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic behavior of orifice compensated hydrostatic thrust bearing subjected to impulse loading by : George Robert Steinbach
Download or read book Dynamic behavior of orifice compensated hydrostatic thrust bearing subjected to impulse loading written by George Robert Steinbach and published by . This book was released on 1976 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Tribology Handbook by : Michael J Neale
Download or read book The Tribology Handbook written by Michael J Neale and published by Elsevier. This book was released on 1995-12-15 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: The renowned reference work is a practical guide to the selection and design of the components of machines and to their lubrication. It has been completely revised for this second edition by leading experts in the area.
Book Synopsis Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air by : David Klooster
Download or read book Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air written by David Klooster and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A hybrid bearing designed for use in a next generation turbo-pump is evaluated for the performance of initial lift-off, referred to as start-transient. The radial test rig features a high-speed spindle motor capable of 20,000 rpm that drives a 718 Inconel rotor attached via a high-speed coupling. The drive end is supported by ceramic ball bearings, while the hybrid bearing supports the opposite end. A magnetic bearing delivers the applied loading along the mid-span of the rotor. Many parameters, including ramp rate [rpm/s] (drive torque), supply pressure at 15,000 rpm, magnitude of the applied load, and load orientation, are varied to simulate different start-transient scenarios. The data are recorded in .dat files for future evaluation of transient predictions. Analysis of the data includes an evaluation of hydrodynamic and hydrostatic liftoff, an assessment of rub from passing through a lightly damped critical speed, and observation of pneumatic hammer instability. Hydrodynamic lift-off occurs when the hydrodynamic pressure, resulting from the relative motion of two surfaces, overcomes the forces acting on the rotor; no indication of hydrodynamic lift-off is provided. Hydrostatic lift-off results from the external supply pressure (which for this test rig is speed dependent) overcoming the forces acting on the rotor as determined from rotor centerline plots. With 0.263 bar applied unit load in the vertical direction, hydrostatic lift-off occurs at 0 rpm and 2.08 bar supply pressure. With a much higher load of 1.53 bar, hydrostatic lift-off is at 12,337 rpm and 10.7 bar supply pressure. The required supply pressure for hydrostatic lift-off is approximately a linear function of the applied unit load. In a turbopump, hydrostatic lift-off depends on the speed because the supply pressure is proportional to the speed squared. With the load in the horizontal direction, hydrostatic lift-off occurs at lower speeds and pressures. The ramp rate did not affect the required supply pressure for hydrostatic lift-off. A lower supply pressure at 15,000 rpm lowered the required supply pressure for hydrostatic liftoff as well as the natural frequencies creating a rub. The hydrostatic lift-off speed should be minimized to avoid damage to the rotor/bearing surfaces due to contact.
Book Synopsis Rotordynamics of Turbomachinery by : John M. Vance
Download or read book Rotordynamics of Turbomachinery written by John M. Vance and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the rotordynamic considerations that are important to the successful design or troubleshooting of a turbomachine. Shows how bearing design, fluid seals, and rotor geometry affect rotordynamic behavior (vibration, shaft whirling, bearing loads, and critical speeds), and describes two successful computational methods for rotordynamic analysis in terms that can be understood by practicing engineers. Gives descriptive accounts of the state of the art in several areas of the field and presents important mathematical or computational concepts, describing equations and formulas in physical terms for better understanding. Also offers tips for troubleshooting unstable machines and provides practical interpretations of vibration measurements.
Book Synopsis Hydrostatic Lubrication by : R. Bassani
Download or read book Hydrostatic Lubrication written by R. Bassani and published by Elsevier. This book was released on 1992-08-20 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrostatic lubrication is characterized by the complete separation of the conjugated surfaces of a kinematic pair, by means of a film of fluid, which is pressurized by an external piece of equipment. Its distinguishing features are lack of wear, low friction, high load capacity, a high degree of stiffness and the ability to damp vibrations. This book reviews the study of externally pressurized lubrication, both from the theoretical and the technical point of view, thereby serving the needs of both researchers as well as students and technical designers. In this connection, design suggestions for the most common types of hydrostatic bearings have been included, as well as a number of examples. A comprehensive bibliography is included with each chapter providing up to date references for more in depth coverage.
Book Synopsis Marine Propellers and Propulsion by : John Carlton
Download or read book Marine Propellers and Propulsion written by John Carlton and published by Butterworth-Heinemann. This book was released on 2012-10-30 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: The early development of the screw propeller. Propeller geometry. The propeller environment. The ship wake field, propeller performance characteristics.
Book Synopsis Annual Research Progress Report by :
Download or read book Annual Research Progress Report written by and published by . This book was released on 1979 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas Turbine Engineering Handbook by : Meherwan P. Boyce
Download or read book Gas Turbine Engineering Handbook written by Meherwan P. Boyce and published by Elsevier. This book was released on 2017-09-01 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Gas Turbine Engineering Handbook has been the standard for engineers involved in the design, selection, and operation of gas turbines. This revision includes new case histories, the latest techniques, and new designs to comply with recently passed legislation. By keeping the book up to date with new, emerging topics, Boyce ensures that this book will remain the standard and most widely used book in this field. The new Third Edition of the Gas Turbine Engineering Hand Book updates the book to cover the new generation of Advanced gas Turbines. It examines the benefit and some of the major problems that have been encountered by these new turbines. The book keeps abreast of the environmental changes and the industries answer to these new regulations. A new chapter on case histories has been added to enable the engineer in the field to keep abreast of problems that are being encountered and the solutions that have resulted in solving them. Comprehensive treatment of Gas Turbines from Design to Operation and Maintenance. In depth treatment of Compressors with emphasis on surge, rotating stall, and choke; Combustors with emphasis on Dry Low NOx Combustors; and Turbines with emphasis on Metallurgy and new cooling schemes. An excellent introductory book for the student and field engineers A special maintenance section dealing with the advanced gas turbines, and special diagnostic charts have been provided that will enable the reader to troubleshoot problems he encounters in the field The third edition consists of many Case Histories of Gas Turbine problems. This should enable the field engineer to avoid some of these same generic problems
