Active control of unsteady motion phenomena in turbomachinery

Details Active control of unsteady motion phenomena in turbomachinery Active control of unsteady motion phenomena in turbomachinery

1990-02-07

1992-01-21

Casaregola, Louis J.

Rotary kinetic fluid motors or pumps

With inspection, signaling, indicating or measuring means

415114, F04D 2702

Patent

active

050824210

ABSTRACT:
A control system actively controls at least one troublesome mode of an unsteady motion phenomenon in turbomachinery in order to enable an increase in the operating range of the turbomachinery. For example, rotor blade flutter or rotating stall may be controlled in a turbocompressor. The control system has a control bandwidth which is at least partly coextensive with the bandwidth of the unsteady motion phenomenon and operates by passing sensor signals related to the unstady motion phenomenon from a sensor array in the turbomachine to a mode filter which produces a signal or signals which are related to the troublesome mode or modes. The selected mode signals are amplified and phase-shifted by time-variable amounts so as to produce control signals having controlled amplitude and phase relationship to the troublesome mode. Actuators in an actuaor array are continuously driven by the control signals and produce physical effects in the turbomachine which act counter to the troublesome mode without exciting others.

REFERENCES:
patent: 2926524 (1960-03-01), Sanders
patent: 3245219 (1966-04-01), Warden et al.
patent: 3936606 (1976-02-01), Wanke
patent: 4255083 (1981-03-01), Andre et al.
patent: 4557106 (1985-12-01), Williams et al.

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