Active dynamic beater

Details Active dynamic beater Active dynamic beater

2005-08-30

2005-08-30

Williams, Thomas (Department: 3683)

Brakes

Inertia of damping mass dissipates motion

C248S550000, C267S136000, C267S140150

Reexamination Certificate

active

06935471

ABSTRACT:
The invention provides a dynamic beater comprising a spring-mass unit, said unit having a mass M and a stiffness K actuated by a drive motor and presenting a device for coupling to a host structure for damping, the beater presenting a first acceleration sensor secured to said mass and delivering a first signal s1, and a second acceleration sensor for mounting on the host structure and delivering a second signal s2, and also having a power amplifier supplying an output signal for controlling the drive motor in response to an input signal E which is a function of a difference between the signals from the first and second acceleration sensors after passing at least one of said signals through at least one lowpass filter and/or phase delay type filter.

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Inertia-Wheel Vibration-Damping System, NTIS Tech Notes, U.S. Department of Commerce, Springfield, VA, Oct. 1, 1990, pp. 854-855.

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