... dissipation through sliding motions between the bump foil, top foil, and bearing housing, creating dry-friction effects. gas foil bearing active gas bearing piezoelectric actuator vibration control rotordynamic instability 27 06 2018 16 08 2018 Manuscript received June 27...

... 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...

... frequencies of the rotor within the range of the engine speeds in service. blades discs (structures) electromagnets frequency response friction numerical analysis steam turbines vibration control 11 05 2010 03 06 2010 11 11 2010 11 11 2010 Electromagnet...

... Turbines Power 0742-4795 , 121 ( 3 ), pp. 504 – 508 . 10.1115/1.2818501 Sahinkaya , M. N. , Cole , M. O. T. , and Burrows , C. R. , 2001 , “ Fault Detection and Tolerance in Synchronous Vibration Control of Rotor-Magnetic Bearing Systems ,” Proc. Inst. Mech. Eng., Part C: J...

...M. Necip Sahinkaya; Abdul-Hadi G. Abulrub; Clifford R. Burrows; Patrick S. Keogh The paper considers three issues in flexible rotor and magnetic bearing systems, namely, the control of rotor vibration, control of transmitted forces, and prevention of rotor contact with auxiliary bearings...

...Andrea Tonoli; Nicola Amati; Angelo Bonfitto; Mario Silvagni; Bernard Staples; Evgueni Karpenko The vibration control of rotors for gas or steam turbines is usually performed using passive dampers when hydrodynamic bearings are not used. In layouts where the rotating parts are supported by rolling...

... absorbers turbomachinery vibration control blade damping damping optimization intentional mistuning bladed disk blade vibration Damping is a critical component of structural dynamic systems operating at or near resonances. This observation is particularly true in engine/turbomachinery...

... 2010 03 03 2010 angular velocity control electric motors minimisation phase modulation resonance vibration control vibrations The system that is shown in Fig. 1 will be considered as the first one. This figure corresponds to the “half” model of the over-resonance vibratory...

... that take account of the SFDs’ nonlinearity to ascertain smooth running particularly at the unsupported SFDs ( 1 ). aerospace engines machine bearings time-domain analysis vibration control 23 03 2009 27 03 2009 03 12 2009 03 12 2009 2010 American Society...

... vibration control viscosity squeeze film dampers air entrapment feed-squeeze flow number dimensionless air entrainment map Squeeze film dampers are often employed in high-speed rotating machinery to provide additional external damping to rotor-bearing systems with the purpose of reducing...

... 04 04 2008 13 04 2009 machinery nonlinear systems seals (stoppers) vibration control Squeeze film dampers (SFDs) aid to reduce synchronous vibration amplitude and enhance stability characteristics in rotating machinery. Since first formally tested by Cooper ( 1 ) more than 40...

... 07 04 2008 22 12 2008 compressible flow gas turbines hydrodynamics hydrostatics machine bearings rotors vibration control Gas lubricated bearing systems offer several advantages over oil lubricated bearings such as lower power loss, less sealing requirements, extreme...

... testing orifices (mechanical) seals (stoppers) vibration control Squeeze film dampers (SFDs) are widely employed to reduce rotor vibration or to suppress instabilities in rotating machinery equipment. Main applications of SFD include aircraft jet engines and process gas compressors...

... to Blade Vibration Control ,” Proceeding of Design Engineering Technology Conferences , ASME Paper No. De-Vol. 84-2, Vol. 3 Pt. B, pp. 1377 – 1382 . Yang , B. D...

... rotors machine control vibration control magnetic bearings wavelet transforms transient response control system synthesis signal reconstruction machine bearings Rotor/magnetic bearing systems may experience disturbances giving rise to transient rotor vibration. Unbalance changes, flow...

... hydrogen crystal growth crystal orientation finite element analysis transients vibration control Single-crystal nickel-base superalloy turbine blades are especially prone to fretting/contact fatigue damage because the subsurface shear stresses induced by fretting action at the damper contact...

... . Chu, F., 1993, The Vibration Control of a Flexible Rotor by Means of a Squeeze Film Damper , Ph.D. thesis, University of Southampton, UK. Feng , N. S. , and Hahn , E. J. , 1985 , “ Density and Viscosity Models for Two-Phase Homogeneous Hydrodynamic Damper Fluids ,” ASLE Trans. , 29...

... Bearings ,” Int. J. Solids Struct. , 38(10–13 ), pp. 2069 – 2081 . Nicoletti, R., and Santos, I. F., 2001, “Vibration Control of Rotating Machinery Using Active Tilting-Pad Bearings,” Proceedings of the IEEE/ASME International Conference on Advanced Intelligent Mechatronics , Como, Italy, July 8–11...

... 2004 magnetic bearings vibration control rotors controllers bushings synchronous machines machine bearings It is common practice in rotor/magnetic bearing systems to incorporate auxiliary bearings that prevent damage to the rotor and stator laminations. In many applications...

... Contacts Having Variable Normal Load ,” J. Sound Vib. 0022-460X 10.1006/jsvi.1997.1305 , 210 ( 4 ), pp. 461 – 481 . Menq , C. H. , Chidamparam , P. , and Griffin , J. H. , 1991 , “ Friction Damping of Two-dimensional Motion and Its Application in Vibration Control ,” J. Sound...