... 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...

.... 1 . damping dynamic testing elasticity machine bearings rotors 12 05 2011 12 05 2011 29 02 2012 29 02 2012 2012 American Society of Mechanical Engineers ...

... 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 labyrinth seal forces, internal friction damping within...

... compared to the values at room temperature. 13 04 2011 09 09 2011 15 02 2012 15 02 2012 computational fluid dynamics cooling damping elasticity gas turbine power stations gas turbines hydrodynamics impellers machine bearings perturbation techniques rotors shafts...

... flow rate from the compressor increased from 21 to 74 g/s. The average TC compressor exit power was estimated at ∼34% of the turbine inlet power over this range. 31 03 2011 18 07 2011 04 01 2012 04 01 2012 compressors diesel engines heat transfer machine bearings...

... 2011 28 12 2011 28 12 2011 abrasion aerodynamics aerospace components aerospace propulsion friction machine bearings rotors turbomachinery hybrid air foil bearing oil-free aero-propulsion Air/gas foil bearings (AFBs) have shown promise in high-speed micro...

... of the available models for such devices. compressors convection lubrication machine bearings rotors 27 04 2011 03 05 2011 20 12 2011 20 12 2011 2012 American Society of Mechanical Engineers ...

... 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...

... of GFBs. damping elastic constants machine bearings net structures (mechanical) rotors stainless steel 12 04 2011 17 04 2011 27 10 2011 27 10 2011 2012 American Society of Mechanical Engineers ...

... frequency for stationary journal and for journal spinning at 50 krpm (834 Hz) 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...

... 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...

... coefficients and within 30% for the direct damping coefficients. lubrication machine bearings machine testing rotors turbomachinery Tilting pad journal bearings (TPJBs) are widely used in the turbomachinery industry to help extend operating ranges of rotating equipment by increasing the limited...

.... machine bearings shafts torque measurement 2011 American Society of Mechanical Engineers ...

... Turbulence Closure ,” J. Fluid Mech. 0022-1120 , 68 ( 3 ), pp. 537 – 566 . 10.1017/S0022112075001814 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...

... in either load or speed, in contrast to predictions of marked C y y sensitivity for changes in the load. Only at the highest test speed of 13,000 rpm were the direct damping coefficients adequately predicted. No frequency dependency was observed for the direct damping coefficients. damping machine...

... II) compares the measured bearing temperatures and the rotor response amplitudes to predictions. 09 04 2010 15 04 2010 17 02 2011 17 02 2011 cooling gas turbines machine bearings rotors shafts temperature measurement Gas foil bearings (GFBs) enable...

... and shaft centrifugal growth due to rotational speed improves the accuracy of the model predictions. gas turbines heat transfer machine bearings rotors shafts thermal expansion thermal management (packaging) thermoelasticity 09 04 2010 15 04 2010 17 02 2011 17 02 2011...

... 2010 aerospace components aerospace engines damping design engineering elasticity finite difference methods friction hydrostatics machine bearings orifices (mechanical) turbomachinery air foil thrust bearing hydrostatic hybrid oil-free turbomachinery Environment...

... computational 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...

... 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...