... testing elasticity machine bearings rotors Tilting-pad journal bearings (TPJBs) are commonly used in rotating machines because of their substantial stability benefits over conventional, fixed-geometry journal bearings. TPJBs have multiple pads that rotate to balance fluid film forces, directing...

... 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...

... . Seal (synchronous) stiffness and damping coefficients versus inlet gas volume fraction (β S ). Mixture N 2 in ISO VG 2 oil (Δ P  = 71 bar, 10 krpm). 11 04 2011 13 04 2011 14 12 2011 14 12 2011 bubbles elasticity flow instability hydrocarbon reservoirs laminar...

... is presented to illustrate the associated dynamic phenomena and fluid-structure interaction within the internal assembly of the check valve. 08 04 2011 09 04 2011 31 08 2011 31 08 2011 compressors elasticity flow instability fluid oscillations hydrodynamics nozzles springs...

.... Here we applied the elastic aerodynamic force assumption [( 5 )] and adopted the assumption that the mistuning is not so severe so that { Φ } is a constant among all blades. Structural damping ξ and external excitation forces, such as wake passing, are ignored for simplicity...

... excitations. 04 11 2009 21 06 2010 18 11 2010 18 11 2010 aerospace components aerospace engines damping design engineering elasticity finite difference methods friction hydrostatics machine bearings orifices (mechanical) turbomachinery air foil thrust bearing...

... the fundamental elastic mode. C eq hybrid brush seal equivalent viscous damping coefficient (Ns m) C α β test system viscous damping coefficient (Ns m); α , β : x , y C s α β predicted seal viscous damping coefficient (Ns m...

...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...

... temperature, and thermal stress. This model provides insights into the complicated DPF working mechanism, and it can be used as design tools to reduce filter pressure drop while enhance its short term and long term durability. 17 04 2007 20 05 2008 20 11 2008 diesel engines elasticity...

... Combustion System Due 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...

... 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...

.... Manuscript received by IGTI, Oct. 2002, final revision, Mar. 2003. Associated Editor: H. R. Simmons. 16 June 2003 01 Oct 2002 01 Mar 2003 13 06 2006 machine bearings foils damping friction wear rotors mechanical stability elasticity gas turbines machine testing...

... + β l l ω 0 k 2 ) Using the sum of the elastic and kinetic energies as Ljapounov function, it can be shown that the positive definiteness of the “damping” matrix is a sufficient condition for stability. This condition is necessary, according to the inequality of Eq. 19 , only...

... survey of the rotordynamic behavior of labyrinths. seals (stoppers) gas turbines rotors flow simulation perturbation theory stability elasticity pressure 04 June 2001 01 Dec 2000 01 Mar 2001 27 12 2002 Contributed by the International Gas Turbine Institute...

... engines aerospace testing 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...