초록 ▼

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 syst

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 unsteady 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 actuator 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.

대표청구항 ▼

In a turbomachine, a control system for actively controlling the dynamics of at least one mode of at least one unsteady motion phenomenon associated with the blading of said turbomachine, said control system having a control bandwidth which is at least partly coextensive with the bandwidth of said u

In a turbomachine, a control system for actively controlling the dynamics of at least one mode of at least one unsteady motion phenomenon associated with the blading of said turbomachine, said control system having a control bandwidth which is at least partly coextensive with the bandwidth of said unsteady motion phenomenon and comprising: (a) an array of sensors located in said turbomachine in predetermined relationship to said unsteady motion phenomenon for continuously producing from each of said sensors sensor signals related to said unsteady motion phenomenon; (b) signal processing means connected to receive said sensor signals from each of said sensors and having at least one channel for continuously processing said sensor signals and continuously outputting control signals; and (c) actuator means located in said turbomachine in predetermined relationship to said unsteady motion phenomenon, said actuator means being adapted to be continuously driven by said control signals; wherein said signal processing means comprises: (i) means for summing sensor signals from each of said sensors in predetermined combinations thereof and weighing said sums to obtain signals representing at least one independent measure of said at least one mode in said at least one channel; and (ii) means for modifying said signals representing said at least one independent measure in said at least one channel to obtain said control signals in controlled phase and amplitude relationship to said at least one mode, said actuator means thereby producing outputs effective to change said dynamics of said at least one mode so as to minimize the physical effects of said dynamics on said turbomachine, said turbomachine being a turbocompressor, said at least one unsteady motion phenomenon being unsteady fluid flow in said turbocompressor with at least some of said array of sensors being disposed to detect the unsteady fluid flow and produce said sensor signals.