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Keywords: elasticity
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Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2012, 134(5): 052505.
Published Online: February 29, 2012
... damping dynamic 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...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. February 2012, 134(2): 022503.
Published Online: December 14, 2011
... or centering stiffnesses within particular frequency ranges [( 6 )]. This fundamental development permits to make of seals load bearing elements and increasing the rotor-bearing system damping ratio (logarithmic decrement) well above accepted (standard) industrial specifications. bubbles elasticity...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. December 2011, 133(12): 122401.
Published Online: August 31, 2011
... and flow velocity amplitudes of station to unit check valves 08 04 2011 09 04 2011 31 08 2011 31 08 2011 compressors elasticity flow instability fluid oscillations hydrodynamics nozzles springs (mechanical) valves compressor station nozzle check valves...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. December 2011, 133(12): 122502.
Published Online: August 26, 2011
.... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. April 2011, 133(4): 042501.
Published Online: November 18, 2010
... excitations. Peng , J. P. , and Carpino , M. , 1993 , “ Calculation of Stiffness and Damping Coefficients for Elastically Supported Gas Foil Bearings ,” ASME J. Tribol. 0742-4787 , 115 ( 1 ), pp. 20 – 27 . 10.1115/1.2920982 Carpino , M. , and Talmage , G. , 2003...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. April 2010, 132(4): 042503.
Published Online: January 26, 2010
... elasticity friction gas turbines hydrodynamics rotors seals (stoppers) shafts wear Pressure ratio P r = P s / P d = absolute supply pressure/absolute discharge pressure. Smaller load magnitudes lead to stick-slip (nonlinear) phenomenon with erratic seal behavior...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2010, 132(3): 032503.
Published Online: December 3, 2009
...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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2009, 131(4): 042903.
Published Online: April 15, 2009
... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2009, 131(2): 022505.
Published Online: December 23, 2008
..., 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2009, 131(2): 022802.
Published Online: December 18, 2008
... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2009, 131(1): 012802.
Published Online: November 20, 2008
... field is solved, the strain and stress fields are easily obtained using Eqs. 9 , 8 . Geometry of porous wall for 3D thermal stress analysis It is well established that the elastic properties of porous materials depend on its porosity. There have been several published approaches...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. September 2008, 130(5): 051505.
Published Online: June 16, 2008
... levels also match fairly well. 06 03 2007 04 03 2008 16 06 2008 air pollution control combustion combustion equipment computational fluid dynamics elasticity fatigue finite element analysis nitrogen compounds pressure sensors structural acoustics temperature distribution...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2008, 130(2): 022502.
Published Online: February 25, 2008
... 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...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2007, 129(3): 865–869.
Published Online: September 1, 2006
..., 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...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2006, 128(3): 626–633.
Published Online: June 13, 2006
..., 2003, Paper No. 2003-GT-38833. 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...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2005, 127(3): 654–662.
Published Online: December 13, 2004
... and aerodynamic coupling. 08 08 2002 13 12 2004 turbomachinery perturbation techniques elasticity eigenvalues and eigenfunctions damping aerodynamics reliability elastodynamics In structural dynamics, the formulation and associated developments of the discrete model describing...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2003, 125(1): 167–174.
Published Online: December 27, 2002
... 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...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Eng. Gas Turbines Power. October 2002, 124(4): 1003–1010.
Published Online: September 24, 2002
... computationally intensive, and it is difficult to ensure high fidelity. A contributor to the complexity of this problem is that there are a large number of relevant physical parameters. aerospace engines aerospace testing parameter space methods aerodynamics compressible flow stability elasticity...