... stiffnesses and added mass coefficients; the latter was previously ignored or largely under predicted. 21 06 2011 22 06 2011 01 03 2012 01 03 2012 compressors finite element analysis hydrodynamics lubricating oils machine bearings rotors Oil seals are used...

... , “ A Parameter Identification Method for the Rotordynamic Coefficients of a High Reynolds Number Hydrostatic Bearing ,” ASME J. Vib. Acoust. , 115 , pp. 264 – 270 . 10.1115/1.2930343 12 05 2011 12 05 2011 29 02 2012 29 02 2012 damping dynamic testing elasticity machine...

... at the University of Virginia is greatly appreciated. 12 09 2010 22 09 2011 23 02 2012 23 02 2012 compressors gas turbines machine bearings rotors vibration measurement Rotordynamic instability is a self-excited vibration phenomenon which can result due to aerodynamic...

... section, 50,000 rpm; temperatures in the parenthesis are the average top foil temperature. ( a ) Stiffness coefficients. ( b ) Damping coefficients. computational fluid dynamics cooling damping elasticity gas turbine power stations gas turbines hydrodynamics impellers machine bearings...

... transfer machine bearings polynomials turbines turbocharger oil-free turbocharger gas foil bearing (GFB) rotordynamic force coefficients turbocharger efficiency A turbocharger (TC) is a turbine-powered compressor that recovers wasted energy from the exhaust gas to supply a greater...

.... 20 DellaCorte , C. , 1998 , “ A New Foil Air Bearing Test Rig for use to 700C and 70,000 RPM ,” STLE Tribol. Trans. , 41 ( 3 ), pp. 335 – 340 . 10.1080/10402009808983756 abrasion aerodynamics aerospace components aerospace propulsion friction machine bearings rotors...

... convection lubrication machine bearings rotors Tilting pad journal bearings are commonly used in rotating machinery due to their inherent stability properties [( 1 2 )] Hence, an important amount of effort has been put during the last four decades in order to improve the quality and accuracy...

... bearing support than those at the left edge. The paper presents test data along with detailed test GFB/shaft geometries and material properties. 31 03 2011 16 05 2011 08 12 2011 08 12 2011 machine bearings motor drives strain gauges temperature measurement turbomachinery...

... damping elastic constants machine bearings net structures (mechanical) rotors stainless steel Gas foil bearings (GFBs) have been considered as alternatives to traditional bearings due to increasing needs for high speed and temperature operation with high efficiency. Typically, multiple leaves...

.../j.triboint.2007.12.009 24 04 2010 06 05 2010 13 05 2011 13 05 2011 damping elastic constants impact (mechanical) machine bearings rotors stress analysis turbomachinery The metal mesh foil bearing (MMFB) is a novel gas bearing technology that aims to provide...

... this measurement by developing a patented, high-frequency, high-amplitude shaker system, resulting in excitation over most of the subsynchronous range. 10 05 2010 09 08 2010 06 05 2011 06 05 2011 damping design engineering machine bearings mechanical testing rotors turbomachinery...

... and Expander-Compressors for Petroleum, Chemical and Gas Industry Services ,” API 617 , 7th ed. , American Petroleum Institute , Washington, DC . 09 05 2010 31 07 2010 19 04 2011 19 04 2011 lubrication machine bearings machine testing rotors turbomachinery...

.... , and Friswell , M. L. , 2002 , “ Identification of Speed-Dependent Bearing Parameters ,” J. Sound Vib. 0022-460X , 254 ( 5 ), pp. 967 – 986 . 10.1006/jsvi.2001.4140 Adams , M. , 2001 , Rotating Machinery Vibrations , Dekker , New York . machine bearings shafts torque...

... width of front chamber w R width of rear chamber Greek Symbols ρ density 06 07 2010 19 07 2010 08 04 2011 08 04 2011 computational fluid dynamics laser Doppler anemometry lubrication machine bearings shafts bearing chamber aero...

.... 264 – 270 . 10.1115/1.2930343 05 08 2009 21 08 2009 06 04 2011 06 04 2011 damping machine bearings rockets rotors turbomachinery In 1964, Lund ( 1 ) calculated the stiffness and damping coefficients for a single, fixed, nonrotational pad and then summed...

... II) compares the measured bearing temperatures and the rotor response amplitudes to predictions. cooling gas turbines machine bearings rotors shafts temperature measurement Gas foil bearings (GFBs) enable microturbomachinery (MTM) operating at extreme conditions in rotational speed...

... denoted. gas turbines heat transfer machine bearings rotors shafts thermal expansion thermal management (packaging) thermoelasticity Kim and co-worker ( 2 3 ) presented full details on the thermal elastohydrodynamic model for prediction of GFBs forced performance, static and dynamic...

... have been reported for decades. air foil thrust bearing hydrostatic hybrid oil-free turbomachinery aerospace components aerospace engines damping design engineering elasticity finite difference methods friction hydrostatics machine bearings orifices (mechanical...

... fluid dynamics heat transfer machine bearings pipe flow temperature distribution two-phase flow vents (mechanical components) Advanced aircraft engine development dictates high standards of reliability for the lubrication systems not only in terms of the proper lubrication of the bearings...

... machine bearings turbomachinery Implementing gas foil bearings (GFBs) in high power density microturbomachinery ( < 250   kW ) increases mechanical efficiency, reliability, and operating life while reducing system complexity and maintenance costs ( 1 ). A radial foil bearing...