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Active control of unsteady motion phenomena in turbomachinery

  • US 5,082,421 A
  • Filed: 02/07/1990
  • Issued: 01/21/1992
  • Est. Priority Date: 04/28/1986
  • Status: Expired due to Term
First Claim
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1. 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 weighting 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 signal processing means and at least one other part of said control system being disposed for rotation relative to each other, said one other part of said control system being selected from said sensor means and said actuator means, said rotation being tied to rotation of rotary parts of said turbomachine, said signal processing means incorporating heterodyning means for fixing the frame of reference of the signal processing means relative to the frame of reference of said at least one other part of the system.

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