A flight test is described in which an active structural/acoustic control system reduces turboprop induced interior noise on a Raytheon Aircraft Company 1900D airliner. Control inputs to 21 inertial force actuators were computed adaptively using a transform domain version of the multichannel filtered-X LMS algorithm to minimize the mean square response of 32 microphones. A combinatorial search algorithm was employed to optimize placement of the force actuators on the aircraft frame. Both single frequency and multi-frequency results are presented. Reductions of up to 15 dB were obtained at the blade passage frequency (BPF) during single frequency control tests. Simultaneous reductions of the BPF and next 2 harmonics of 10 dB, 2.5 dB and 3.0 dB, were obtained in a multi-frequency test.


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    Title :

    Flight Test of ASAC Aircraft Interior Noise Control System


    Contributors:
    Palumbo, Dan (author) / Cabell, Ran (author) / Cline, John (author) / Sullivan, Brenda (author)

    Publication date :

    1999-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Flight test of ASAC aircraft interior noise control system

    Palumbo, Dan / Sullivan, Brenda / Cabell, Ran et al. | AIAA | 1999



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