Active control precision damping table

Details Active control precision damping table Active control precision damping table

1991-04-03

1993-01-19

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

With stabilizing features

318600, 318448, 248550, G05B 501

Patent

active

051809583

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: 4181029 (1980-01-01), Talbott, Jr.
patent: 4340777 (1982-07-01), DeCosta et al.
patent: 4483425 (1984-11-01), Newman
patent: 4633982 (1987-01-01), Swigert
patent: 4872190 (1989-10-01), Stojkov et al.

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