Brakes – Inertia of damping mass dissipates motion
Patent
1988-02-29
1989-04-04
Butler, Douglas C.
Brakes
Inertia of damping mass dissipates motion
248550, 267136, F16F 710
Patent
active
048177687
ABSTRACT:
Large space structures are generally constructed of very stiff beams with little structural damping. Periodic activities such as instrument pointing can cause small beam deformations which can accumulate over time in the frequency vicinity of structural resonances. The beam vibration damping system is a low mass, add-on system of structure, sensors, actuators and controllers that measures and controls the lateral translational velocity of a damped point on the beam relative to a reference point on the beam. The beam vibration damping system mast structure is erected about normal to the beam at the reference point with a deformation measurement mechanism attached to the end mast structure displaced from the beam axis, and attached the damped point on the beam by a cable. A controlled tension mechanism is also attached to the end of the reference structure displaced from the beam axis, and is attached by a cable to the damped point on the beam. A controller uses the beam deformation measurements to calculate the lateral translational rate at the damped point and commands the controlled tension mechanism to produce a cable tension to oppose the beam lateral rate.
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patent: 4673170 (1987-06-01), Dykema
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patent: 4778037 (1988-10-01), Papadopoulos
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