EFFECT OF TWO LOBE WAVE SQUEEZE FILM DAMPER IN THE SUPPORT OF AN UNBALANCED RIGID ROTOR

Yıl 2012, Cilt: 2 Sayı: 2, 26 - 31, 23.07.2016

Giovanni Adiletta Erasmo Mancusi

Öz

A possible improvement of the performances of squeeze film damper (SFD) for supporting the rotors of high-speed turbomachinery has been sought adopting a two lobe, wave (2LW) geometry of the bearing bore. A statically unbalanced, symmetrical, rigid rotor supported with 2LW-SFD has been theoretically examined through numerical continuation, assuming laminar, isoviscous oil flow within the damping film and incomplete centering action of the retainer springs mounted parallel to the film. Despite nonlinearity which still affects the system, the obtained results highlight the potential of the unconventional geometry as a mean for a possible reduction of the typical drawbacks in the response with conventional SFD, mainly consisting in undesired whirling motions with too large journal orbits and/or nonsynchronous character, so as to assure more safe conditions for the rotor operation. Yet, further theoretical and experimental investigation is desirable in order to confirm such an outcome

Anahtar Kelimeler

lubrication, squeeze film damper, rotordynamics, bifurcation

Kaynakça

• Adiletta, G., & Della Pietra, L. (2002). The Squeeze Film Dampers Over Four Decades of Investigations. Part II: Analyses With Rigid and Flexible Rotors. The Shock and Vibration Digest. 34 (2), 97-126.
• Adiletta, G., Mancusi, E., & Strano, S. (2011). Nonlinear behavior analysis of a rotor on two-lobe wave journal bearings. Tribology International, 44(1), 42-54.
• Birmann, R. (1933). US Patent 1,926,225, “Turbo Compressor”.
• Bonello, P., Brennan, M.J., Holmes, R. (2002). Non-linear modelling of rotor dynamic systems with squeeze film dampers- An efficient integrated approach. Journal of Sound and Vibration, 249(4), 743-773.
• Della Pietra L., & Adiletta G. (2002). The Squeeze Film Dampers Over Four Decades of Investigations. Part I: Characteristics and Operating Features. The Shock and Vibration Digest. 34 (1), 3-26.
• de Santiago, O., San Andrés, L., & Oliveras, J.. (1999). Imbalance Response of a Rotor Supported on Open-Ends Integral Squeeze Film Dampers. ASME J. Engineering for Gas Turbines and Power, 121, 718-721.
• Dimofte, F. (1995). Wave journal bearing with compressible lubricant - part I: the wave bearing concept and a comparison to the plain circular bearing. STLE Tribology Transactions, 38(1), 153-160.
• El-Shafei, A., & El-Hakim, M. (2000). Experimental Investigation of Adaptive Control Applied to HSFD Supported Rotors. ASME J. Engineering for Gas Turbines and Power, 122, 685-692.
• Hahn, E.J. (1979). Stability and Unbalance Response of Centrally Preloaded Rotors Mounted in Journal and Squeeze Film Bearings. ASME J. Lubrication Technology, 101, 120-128.
• Inayat-Hussain, J.I., Kanki, H., & Mureithi, N.W. (2003). On the bifurcation of a rigid rotor response in squeeze-film dampers. Journal of Fluids and Structures, 17, 433-459.
• Inayat-Hussain, J.I. (2009). Bifurcations in the response of a flexible rotor in squeeze-film dampers with retainer springs. Chaos, Solitons and Fractals, 39, 519-532.
• Li Xuehai, & Taylor, D.L. (1987). Nonsyncronous Motion of Squeeze Film Damper Systems. ASME J. Tribology, 109, 169-176.
• Mohan, S., & Hahn, E.J. (1974). Design of Squeeze Film Damper Supports for Rigid Rotors. ASME J. Engineering for Industry, 96, 976-982.
• Pinkus, O. (1956). Analysis of Elliptical Bearings. Trans. ASME, 78, 965-973.
• Taylor, D.L., & Kumar, K. (1980). Nonlinear Response of Short Squeeze Film Dampers. ASME J. Lubrication Technology, 102, 51-58.
• White, D.C. (1970). Squeeze Film Journal Bearings. Ph.D. Dissertation, Cambridge University.
• Zhao, J.Y., & Hahn, E.J. (1993). Subharmonic, Quasi-Periodic and Chaotic Motions of a Rigid Rotor Supported by an Eccentric Squeeze Film Damper. IMechE, Proc Inst Mech Engrs, Part C: J. Mechanical Engineering Science, 207, 383-392.
• Zhao, J.Y., Linnet, I.W., & McLean, L.J. (1994). Subharmonic and Quasi-Periodic Motions of an Ecccentric Squeeze Film Damper-Mounted Rigid Rotor. ASME J. Vibration and Acoustics, 116, 357-363.
• Zhao, J. Y., & Hahn, E. J. (1995). Eccentric Operation and Blade-Loss Simulation of a Rigid Rotor Supported by an Improved Squeeze Film Damper. ASME J. Tribology, 117, 490-497.