Measuring and testing – Vibration – Vibrator
Patent
1989-01-23
1991-10-29
Williams, Hezron E.
Measuring and testing
Vibration
Vibrator
248550, 73664, G01M 700, F16M 1300
Patent
active
050605194
ABSTRACT:
An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.
REFERENCES:
patent: 4477045 (1984-10-01), Karasawa et al.
patent: 4730541 (1988-03-01), Greene
patent: 4735296 (1988-04-01), Pinson
patent: 4795123 (1989-01-01), Forward et al.
patent: 4821205 (1989-04-01), Schutten et al.
Chojitani Hitoshi
Itojima Fumiaki
Osaka Takahide
Yasuda Masashi
Finley Rose M.
Greigg Edwin E.
Greigg Ronald E.
Tokkyo Kiki Kabushiki Kaisha
Williams Hezron E.
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