Supports – Including energy absorbing means – e.g. – fluid or friction...
Patent
1994-09-29
1996-12-17
Footland, Lenard A.
Supports
Including energy absorbing means, e.g., fluid or friction...
267113, 384 99, F16C 3906
Patent
active
055844634
ABSTRACT:
A damping arrangement 20 (FIG. 1(b)) for radial vibrations in a turbomachine shaft 10 comprise two circumferentially limited, diametrically opposed damping chambers 22, 23 open towards the shaft and to which gas is supplied alternately by gas flow controllers 29.sub.A and 29.sub.B. Each controller contains fluidic devices switched by sensing pressures in the circumferentially displaced chambers 22', 23', or even the same chambers, as such pressure are modulated by the variations in shaft position, to divert the gas from source 27. The diversion of gas flow is arranged to cause pressure fluctuations, which exert radial thrust on the shaft, advanced in phase to approach of the shaft so as to damp the vibration. The fluidic devices may be implemented by flow amplifiers or fluid logic flip flop 41 (FIG. 2) and may be multistage devices to increase gain, all of which may be formed without moving parts and embedded in the housing. Flow diversion may be effected by other forms of sensing, such as leakage from a nozzle facing the shaft. The arrangement may be combined with, or serve as, a gas seal or be part of a bearing arrangement.
REFERENCES:
patent: 2884282 (1959-04-01), Sixsmith
patent: 3271086 (1966-09-01), Deffrenne
patent: 3442560 (1969-05-01), Gast
patent: 3697142 (1972-10-01), Fortier
NTIS Tech Notes, p. 25, "Damping Seals Would Help Support Turbopump Rotor" (1992).
Shultz Richard R.
Swann Michael K.
Footland Lenard A.
Glacier RPB Inc.
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