Method and apparatus for actively adjusting and controlling a re

Details Method and apparatus for actively adjusting and controlling a re Method and apparatus for actively adjusting and controlling a re

1995-07-17

1997-04-15

Butler, Douglas C.

Brakes

Inertia of damping mass dissipates motion

267136, F16F 1504

Patent

active

056200684

ABSTRACT:
An actively-controlled resonant-type force generator (20) is adapted to be attached to a structure (21), and includes a mass (23) mounted for movement relative to the structure and a plurality of springs (22, 24) operatively arranged between the mass and the structure. A servoactuator (26) is arranged to controllably excite the mass-spring system. The actual force (F.sub.a) transmitted from the mass to the structure is compared with a commanded force (F.sub.c) to produce a force error signal (F.sub.e). The actuator is caused to produce a velocity as a function of the error signal. The gain of the closed force loop is selected so that the resonance of the mass-spring system has an effective damping ratio (.zeta.) greater than about 0.5, and preferably about 0.7. Thus, the mass-spring system will not be substantially resonantly excited by vibrations of the structure near its resonant frequency (.omega..sub.n).

REFERENCES:
patent: 5456341 (1995-10-01), Garnjost et al.

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