... , “ 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...

... 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...

... 14 12 2011 bubbles elasticity flow instability hydrocarbon reservoirs laminar flow pumps rotors seals (stoppers) two-phase flow vibration control viscosity Annular (damper) seals restrict secondary leakage between stages in centrifugal pumps and compressors. The working...

... check valve design spring stiffness compressors elasticity flow instability fluid oscillations hydrodynamics nozzles springs (mechanical) valves It is important to recognize that the main function of the check valves is primarily to protect the compressor unit from damage due...

... dynamics damping discs (structures) elasticity principal component analysis As a result of manufacturing imperfection, or field damage, small geometry variations often exist among blades on a turbomachinery rotor. This condition, referred to as geometric blade mistuning [( 1 2 3 4 5...

... ) further advanced the HAFB by using corrugated bump foils as elastic foundations and measured the load capacity of HAFB of 38.1 mm diameter up to 35,000 rpm. Experimental measurements showed that load capacity at low speeds (10,000 rpm) was increased significantly compared with hydrodynamic AFB...

... ) for details on the physical model relying on equivalent stiffness and mass parameters representing the combined actions of the shaft + disk + seal , and derived from mechanical energy considerations for motions exciting the fundamental elastic mode. Smaller load magnitudes lead to stick-slip...

...Luis San Andrés; Thomas Abraham Chirathadam; Tae-Ho Kim Engineered metal mesh foil bearings (MMFBs) are a promising low cost bearing technology for oil-free microturbomachinery. In a MMFB, a ring shaped metal mesh provides a soft elastic support to a smooth arcuate foil wrapped around a rotating...

... to the crack. Anisotropic elasticity and crystal plasticity constitutive models are employed at the grain size scale. It is shown that the standard deviation of the crack tip opening displacement decreases from about 20% for a short surface crack embedded within a single grain to about 7% for a surface crack...

..., in which dampers and blades constitute the unconstrained and constrained structures, respectively. The model of the unconstrained/free structure includes six rigid body modes and several elastic modes, the number of which depends on the excitation frequency. In other words, the motion of the free structure...

... to the injection-pump actuation timing, the fuel-injection rate, the fuel-injection duration, and the injection spray atomization. The primary fuel temperature effects on the injection parameters are from the fuel bulk modulus of elasticity and the density with the fuel viscosity less significant as the injector...

... , Boston, MA . Hashin , Z. , 1983 , “ Analysis of Composite-Materials—A Survey ,” ASME J. Appl. Mech. 0021-8936 , 50 , pp. 481 – 505 . Roberts , A. P. , and Garboczi , E. J. , 2000 , “ Elastic Properties of Model Porous Ceramics ,” J. Am. Ceram. Soc. 0002-7820 , 83 , pp...

... to an Acoustic Field ,” Proceedings of the International Forum on Aeroelasticity and Structural Dynamics , Amsterdam, The Netherlands . Huls , R. A. , 2006 , “ Acousto-Elastic Interaction in Combustion Chambers ,” Ph.D. thesis, University of Twente, The Netherlands. Nowak , D. , Bellucci...

... for any level of refinement required for modeling of elastic damper bodies and for modeling of friction contact interactions. Numerical studies of realistic bladed disks have been performed with three different types of underplatform dampers: (i) a “cottage-roof” (also called “wedge”) damper, (ii) seal...

..., turbulent oil flow, and elastic effects, including that of pad flexibility. The analyzes of the TPJB’s stiffness and damping properties showed that the frequency effects on the bearing dynamic properties depend on the operating conditions and bearing design. It has been concluded that the pad inertia...

... analysis fluid oscillations turbines rotors blades elasticity flow separation The designing and maintaining of flutter-free gas turbine engines remains one of the paramount challenges for engine manufacturers. Flutter denotes a self-excited and self-sustained instability phenomenon that might...

... to traverse critical speeds and to attenuate rotor response to sudden imbalance and thrust loads, becomes crucial. This requirement demands ever smaller clearances than those in oil film bearings, increasing the need to closely monitor tight manufacturing tolerances and surface finishes, thermal and elastic...

... , J. C. and Whaley , P. W. , 1983 , “ Maximum Resonant Response of Mistuned Bladed Disks ,” Vibrations of Bladed Disk Assemblies , ASME , pp. 153 – 160 . 08 08 2002 13 12 2004 turbomachinery perturbation techniques elasticity eigenvalues and eigenfunctions...

... 01 Mar 2001 27 12 2002 seals (stoppers) gas turbines rotors flow simulation perturbation theory stability elasticity pressure Labyrinth-type gas seals are fluid dynamic devices with numerous applications that often require either a minimum or a fixed leakage. Labyrinth...

... parameter space methods aerodynamics compressible flow stability elasticity damping To assure reliability and safety of jet propulsion, the potential for blade flutter must be eliminated from the turbomachinery stages. The current predictive models for aeroengine flutter are typically...