Method and apparatus for synchronizing rotating machinery to red

Details Method and apparatus for synchronizing rotating machinery to red Method and apparatus for synchronizing rotating machinery to red

1991-08-05

1993-06-22

Barefoot, Galen

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Plural distinct impellers having related control

244 1N, 381 71, 364574, B64D 3112

Patent

active

052211851

ABSTRACT:
A system for reducing noise created by multiple rotating machines by synchronizing the machines so as to establish a phase relationship between the machines which minimizes the noise. One or more feedback sensors, such as microphones, are placed so as to sense the noise to be reduced. The noise signals from the microphones are sent to a controller. Tachometer signals of the rotational speed of each machine are also sent to the controller. The controller generates an output signal in response to the inputs from the microphones and the tachometers that is fed to one or more of the rotating machines in order to establish the desired phase relationships.

REFERENCES:
patent: 3071752 (1963-01-01), Strasberg
patent: 3689175 (1972-09-01), Hartzell
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4488240 (1984-12-01), Kapadia et al.
patent: 4947356 (1990-08-01), Elliott et al.
patent: 4953098 (1990-08-01), Fischer, Jr. et al.

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