Vibration detection apparatus

Details Vibration detection apparatus Vibration detection apparatus

1991-07-30

1993-07-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250230, 73655, G01D 534

Patent

active

052296032

ABSTRACT:
A vibration detection apparatus having an outer cylinder having a chamber in which a liquid is sealed, a movable member rotatably held about a predetermined rotating shaft, and detecting means for detecting a relative angular displacement of the movable member and the outer cylinder about the rotating shaft as a vibration signal, includes an electromagnetic means for controlling the relative angular displacement between the movable member and the outer cylinder, and a control means for nonlinearly changing the electromagnetic force of the electromagnetic means in accordance with the relative angular displacement between the movable member and the outer cylinder.

REFERENCES:
patent: 4649748 (1987-03-01), Fukano et al.
patent: 4792931 (1988-12-01), Nishida et al.

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