... an enhanced load-carrying capacity [ 1 ]. In addition, it provides energy 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...

... 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 fluid is a process liquid of light viscosity or a process gas. Annular seals, although similar...

... friction numerical analysis steam turbines vibration control Experimental investigation of the dynamic response of structures such as bladed disks in gas and steam turbines is still of great importance. The exciting force pattern on the bladed disks is due to the gas (or steam) flowing through...

... 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...

... blades damping discs (structures) reduced order systems shock absorbers turbomachinery vibration control 11 09 2008 18 09 2008 07 06 2010 07 06 2010 2010 American Society of Mechanical Engineers ...

... 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 machine, e.g., a screen with forcing...

... to only one rotor, then it is referred to as “single frequency unbalance” (SFU). Otherwise it is multifrequency unbalance (MFU). 23 03 2009 27 03 2009 03 12 2009 03 12 2009 aerospace engines machine bearings time-domain analysis vibration control Aero-engine...

... compressible flow density finite volume methods fracture machine bearings machine control rotors stratified flow turbomachinery vibration control viscosity 28 03 2008 06 05 2008 29 09 2009 β local air volume fraction β 0 reference air volume...

... 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...

... 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 temperature...

... 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...

... element analysis friction shock absorbers turbines vibration control Friction dampers are in widespread use in the turbomachinery industry to control vibration amplitudes of rotating blades. Several designs, such as dog bone, pin type, or wedge elements...

... 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...

... stress field analysis 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...

... compressors rotors numerical analysis vibration control servomechanisms The development of new mechanisms for dissipating vibration energy is of fundamental importance to keep low vibration levels in rotating machines. Among these mechanisms are seal dampers (Vance and Li, 1 ) squeeze-film...

.... 22 November 2002 20 November 2003 24 11 2004 rotors damping cavitation vibration control machine bearings aerospace engines Squeeze film dampers (SFD’s) are nonlinear elements used in aero-engine assemblies primarily to attenuate vibrations and transmitted forces...

... Rotor orbits at selected times (see Fig. 7 , rotor speed 24 Hz, 480 gcm unbalance). A–before vibration control, C–after modified synchronous vibration control, E–following final synchronous vibration control. 7 Modified synchronous vibration control with rotor contact (rotor speed 24 Hz, 480...

.... H. , Chidamparam , P. , and Griffin , J. H. , 1991 , “ Friction Damping of Two-dimensional Motion and Its Application in Vibration Control ,” J. Sound Vib. 0022-460X 10.1016/0022-460X(91)90562-X , 144 , pp. 427 – 447 . Menq , C. H. , and Yang , B. D. , 1998...