Vibration apparatus for minute vibrations

Details Vibration apparatus for minute vibrations Vibration apparatus for minute vibrations

1974-10-01

1976-04-06

Queisser, Richard C.

Measuring and testing

Moisture content or absorption characteristic of material

G01N 2900

Patent

active

039480879

ABSTRACT:
An electro-dynamic shaker and a pendulum system which has a resonant frequency lower than the lower limit of the frequency band of ordinary floor vibrations are fixedly mounted on a base plate. The pendulum system comprises a pendulum, damper and a differential transformer for detecting the relative displacement between the pendulum and the output shaft of the shaker. The detected relative displacement is compared in a control device with an input signal, the difference obtained by the comparison being used as a negative feedback signal to correct the input signal to be fed to the shaker to thereby stably produce minute vibration.

REFERENCES:
patent: 3393555 (1968-07-01), Flannelly
patent: 3597960 (1971-08-01), Otera
patent: 3693400 (1972-09-01), Savit
patent: 3710082 (1973-01-01), Sloane et al.

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