... subsynchronous instabilities that can prevent the full operational capability of the machine. Ongoing research [( 6 ), 7 ] is striving to lower the effective damping crossover frequency in efforts to maximize the useful operating frequency range. compressors mechanical testing rotors seals (stoppers...

... 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...

... parameters. The results of this normalization are used to compare the normalized experimental results with various models from the literature. 28 08 2009 27 01 2010 10 03 2011 10 03 2011 heat transfer mechanical testing pipes surface roughness thermal conductivity...

... of the turbine section. 14 12 2007 11 11 2008 09 04 2009 blades discs (structures) failure (mechanical) failure analysis fatigue cracks finite element analysis gas turbine power stations mechanical testing nozzles stress analysis surface cracks turbogenerators vibrations...

... ceramics corrosion protection corrosion protective coatings cracks delamination engines failure analysis mechanical stability mechanical testing optical microscopy oxidation scanning electron microscopy thermal barrier coatings turbines X-ray chemical analysis 22 12 2007 19 06...

... bearing locations, respectively. 28 03 2008 29 03 2008 02 10 2008 machine bearings mechanical testing rotational flow rotors turbomachinery gas foil bearing external pressurization rotordynamic stability imbalance response Gas foil bearings (GFBs) using...

... Coefficients in a Squeeze Film Damper With a Mechanical Seal ,” Texas A&M University , TRC Report No. TRC-SFD-1-06. 10 05 2007 06 06 2007 29 04 2008 aircraft flow control friction lubricants mechanical testing orifices (mechanical) seals (stoppers) vibration control...

... Bearings: Analysis and Experimental Validation ,” ASME J. Tribol. 0742-4787 10.1115/1.2194918 , 128 , pp. 551 – 558 . 14 04 2006 02 01 2007 rotors hydrostatics machine bearings turbomachinery elastic constants damping mechanical testing bending gas bearings...

... foils machine bearings turbomachinery damping elastic constants mechanical testing elastic deformation spot welding Gas foil bearing technology has made significant progress during the last 30 years . Foil bearings (FBs) fulfill most...

.... Natole. 04 June 2001 01 March 2001 24 09 2002 hot working forging superalloys nickel alloys mechanical testing design of experiments finite element analysis crystal microstructure high-temperature effects At the company Krupp VDM the nickel-based alloys alloy...

.... Manuscript received by IGTI, Dec. 2000, final revision, Mar. 2001. Associate Editor: R. Natole. 04 June 2001 01 Dec 2000 01 Mar 2001 24 09 2002 stators aerospace engines sliding friction damping mechanical contact mechanical testing parameter estimation modelling...

... Headquarters Oct. 2000. Associate Editor: D. Wisler. 08 May 2000 01 Oct 1999 01 Oct 2000 life testing crack detection ceramics high-temperature effects fatigue cracks failure (mechanical) materials testing mechanical testing (a) Choi , S. R. , and Gyekenyesi...

... modes wave propagation finite element analysis mechanical testing The design and analysis of nominally cyclic structures such as bladed disks is often done under the assumption that the structure as a whole is comprised of perfectly identical substructures, or sectors. This assumption...

..., 1999; ASME Paper 99-GT-190. Manuscript received by IGTI March 9, 1999; final revision received by the ASME Headquarters January 3, 2000. Associate Technical Editor: D. Wisler. 07 June 1999 09 March 1999 03 January 2000 ceramics mechanical testing gas turbines composite...

... plastic deformation thermal stresses metallurgy dimensions mechanical testing The dimensional instability phenomenon is basically a change in dimension with respect to time without doing any further work on it. Two probable causes for dimensional instability have been identified...

... yttrium compounds nickel compounds cobalt compounds Young's modulus mechanical testing thermal stresses The increase in gas turbine firing temperature has driven the need to provide blade protection. Actually, as increases in the firing temperatures were made, a coating technology has been...