Modular vibratory force generator, and method of operating same

Details Modular vibratory force generator, and method of operating same Modular vibratory force generator, and method of operating same

1998-02-19

1999-05-11

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 51, F16F15/00

Patent

active

059030771

ABSTRACT:
A modular vibratory force generator (10) is adapted to be mounted on a helicopter fuselage (11) and operated to selectively apply a controllable vibratory force (F.sub.R) thereto. The improved generator includes a plurality of force-generating modules (12, 12) and a closed-loop servocontroller (13). Each module has a pair of counter-rotating eccentric masses (20, 21) that are arranged to exert a fixed-amplitude variable-phase individual force at spaced locations on the fuselage. These individual forces (F.sub.1, F.sub.2) combine to exert a controllable-amplitude resultant vibratory force (F.sub.R) on the structure. The servocontroller is adapted to be supplied with a single sinusoidal control signal and is operative to cause the frequency and phase of the resultant vibratory force to be identical to the frequency and phase of the control signal and to cause the amplitude of the resultant vibratory force to be proportional to the amplitude of the control signal.

REFERENCES:
patent: 3208292 (1965-09-01), Austin et al.
patent: 5005439 (1991-04-01), Jensen et al.

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