Frederick A Ebert

US Patent:

44701217, Sep 4, 1984

Filed:

Aug 17, 1981

Appl. No.:

6/293733

Inventors:

Frederick J. Ebert - Elmwood Park NJ

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

G06F 1550
G06F 1531
G05B 1502
G01G 3142

US Classification:

364508

Abstract:

A variable frequency vibration controller includes a cantilever beam supported from the vibration prone structure whose vibrations are to be controlled. The cantilever beam has selectively shaped hollow interior portions into which fluid can be selectively injected or withdrawn to vary the total mass of the cantilever beam. The cantilever beam natural frequency is thus tuned to match or selectively mismatch the frequency at which the vibration prone structure is vibrating. Thereby, the beam is used to optimally absorb or excite the vibrations of the structure.