Dynamic two frequency vibration damper

Details Dynamic two frequency vibration damper Dynamic two frequency vibration damper

1993-01-21

1994-11-08

Butler, Douglas C.

Brakes

Inertia of damping mass dissipates motion

248559, 267136, F16F 1500

Patent

active

053618785

ABSTRACT:
A damper, especially for a structural element of an aircraft and especially a propeller driven aircraft in which the propeller generates vibration in the structural element with a fundamental frequency and a frequency which is a harmonic of the fundamental frequency. The damper has a cantilever bar which can be flexed and a cup-shaped pendulum element affixed to the bar and tunable so that the mass of the pendulum defines a first eigenfrequency of vibration of the damper corresponding to the fundamental and the moment of inertia about an axis perpendicular to the axis of the bar is tuned to a second eigenfrequency corresponding to the fundamental.

REFERENCES:
patent: 1855570 (1932-04-01), Edison
patent: 2715951 (1955-08-01), Lieber
patent: 3306399 (1967-02-01), Flannelly
patent: 4203546 (1980-05-01), Raquet et al.
patent: 4420134 (1983-12-01), Flannelly
patent: 4527951 (1985-07-01), Trier
patent: 4641809 (1987-02-01), Beer
patent: 4852848 (1989-08-01), Kucera
Database WPIL; Section PQ, Week 9017, Derwent Publications Ltd., London, GB; Class Q, AN 90-130294 & SU-A-1 490 344 (Yarysh).

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