Temperature compensated passive vibration absorber

Details Temperature compensated passive vibration absorber Temperature compensated passive vibration absorber

1997-06-19

1999-07-20

Oberleitner, Robert J.

Brakes

Inertia of damping mass dissipates motion

Resiliently supported damping mass

244 1727, F16F 710

Patent

active

059245328

ABSTRACT:
An apparatus for absorbing vibrations in a structural member, such as in an aircraft fuselage, has a mounting member for attaching to the structural member. Two masses are coupled in a cantilevered manner to the mounting member by a plurality of flexible rigid members, such as rods or plates, which act as a spring that allows the masses to vibrate with respect to the mounting member. The spring-mass assembly has a resonant frequency that matches the frequency of the vibrations in the structural member. A mechanism, connected between the two masses, exerts a variable force on the plurality of rigid members to compensate for changes in their stiffness due to changes in temperature and thereby maintain the resonant frequency substantially constant. Preferably the mechanism includes a bimetallic element that has a shape which changes with temperature variation to produce the variable force.

REFERENCES:
patent: 3487888 (1970-01-01), Adams et al.
patent: 3490556 (1970-01-01), Bennett, Jr. et al.
patent: 4140028 (1979-02-01), Desjardins
patent: 4463560 (1984-08-01), Greenleaf et al.

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