Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1986-12-19
1988-11-01
Smith, Gary L.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 74574, F16F 1510, G05G 100
Patent
active
047810777
ABSTRACT:
A dual shaft rotating assembly typically used in aircraft engines is provided with a stable intershaft squeeze film damper for reducing vibration. The assembly includes a housing, a first shaft rotatable about an axis of rotation, a second shaft concentric with the first shaft and rotatable about the same axis of rotation, bearings for supporting each of the shafts from the housing, a squeeze film damper positioned between the shafts and including an annular region containing an oil film for attenuating vibration, and apparatus for maintaining the damping fluid stationary relative to the housing. The squeeze film damper includes an inner ring and an outer ring which define the annular region between them. A first intershaft bearing is coupled between the first shaft and the inner ring, and a second intershaft bearing is coupled between the second shaft and the outer ring. The inner and outer rings are maintained stationary by squirrel cages coupled to the housing. The stationary oil film provides stable damping for all practical rotating speeds of the shafts.
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Qihan, Li et al., "Investigation of the Steady State Response of a Dual Rotor System with Inter-Shaft Squeeze Film Damper", ASME Paper 85-IGT-39, Sep. 1, 1985.
Cunningham et al., "Design of a Squeeze Film Damper for a Multi-Mass Flexible Rotor", ASME Paper #75-DET-40, 5/23/1975.
Courage, "Experimental Study of an Inter-Shaft Squeeze Film Bearing", I. Mech. E. 1980, pp. 375-380.
D. H. Hibner et al., "Analytical and Experimental, etc., Part 1: Demonstration of Instability," J. Engr. Pwr., vol. 99, No. 1, Jan. 1977, pp. 47-52.
D. H. Hibner et al., "Analysis, etc., Part 2: Control of Instability," J. Mech. Design, Jul. 1978, pp. 558-562.
Qihan Li et al., "Investigation of the Transient Response etc.," AS ME Paper 85-IGT-38, 1985.
A. Z. Szeri et al., "Linear Force Coefficients for Squeeze Film Dampers," ASME Paper 82-Lub-30, 1982.
Luong Vinh
Massachusetts Institute of Technology
Smith Gary L.
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