An experimental study of feedback controller complexity vs noise reduction performance for active structural acoustic control of turbulent-boundary-layer (TBL)-induced sound radiation from a panel is described. The reduction of total radiated sound power as a function of the number of actuators, sensors, and controller cost function on a mock aircraft sidewall subjected to TBL excitation are discussed. The results demonstrate total radiated sound power reductions of 15 dB at resonances and 10 dB integrated over 150-1000 Hz for a three-actuator and 15-sensor case. The controller configuration was then simplified to one actuator and four sensors (summed outputs) and was found to produce 10-15-dB reductions in sound power at resonances and 9 dB integrated over the control bandwidth. This result demonstrates the potential for achieving significant reductions in radiated sound power with a relatively simple actuator/sensor topology.


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    Title :

    Controller complexity for active control of turbulent boundary-layer noise from panels


    Additional title:

    Optimierung des Regelungssystems zur aktiven Dämpfung der Geräusche der turbulenten Grenzschicht an einer Platte


    Contributors:

    Published in:

    AIAA Journal ; 42 , 7 ; 1314-1320


    Publication date :

    2004


    Size :

    7 Seiten, 15 Bilder, 23 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English