Tuned mass damper for integrally bladed turbine rotor

Details Tuned mass damper for integrally bladed turbine rotor Tuned mass damper for integrally bladed turbine rotor

1993-10-12

1994-12-20

Oberleitner, Robert J.

Brakes

Inertia of damping mass dissipates motion

Resiliently supported damping mass

416144, 74573R, 74574, F16F 710

Patent

active

053739221

ABSTRACT:
The invention is directed to a damper ring for damping the natural vibration of the rotor blades of an integrally bladed rocket turbine rotor. The invention consists of an integral damper ring which is fixed to the underside of the rotor blade platform of a turbine rotor. The damper ring includes integral supports which extend radially outwardly therefrom. The supports are located adjacent the base portion and directly under each blade of the rotor. Vibration damping is accomplished by action of tuned mass damper beams attached at each end to the supports. These beams vibrate at a predetermined frequency during operation. The vibration of the beams enforce a local node of zero vibratory amplitude at the interface between the supports and the beam. The vibration of the beams create forces upon the supports which forces are transmitted through the rotor blade mounting platform to the base of each rotor blade. When these forces attain a predetermined design frequency and magnitude and are directed to the base of the rotor blades, vibration of the rotor blades is effectively counteracted.

REFERENCES:
patent: 2336697 (1943-12-01), Moeller
patent: 2643152 (1953-06-01), Brauer
patent: 4848182 (1989-07-01), Novotny
patent: 5257909 (1993-11-01), Glynn et al.

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