This paper presents the test design, instrumentation set-up, data acquisition, and the results of an acoustic flight experiment to study how noise due to blade-vortex interaction (BVI) may be alleviated. The flight experiment was conducted using the NASA/Army Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) research helicopter. A Local Differential Global Positioning System (LDGPS) was used for precision navigation and cockpit display guidance. A laser-based rotor state measurement system on board the aircraft was used to measure the main rotor tip-path-plane angle-of-attack. Tests were performed at Crows Landing Airfield in northern California with an array of microphones similar to that used in the standard ICAO/FAA noise certification test. The methodology used in the design of a RASCAL-specific, multi-segment, decelerating approach profile for BVI noise abatement is described, and the flight data pertaining to the flight technical errors and the acoustic data for assessing the noise reduction effectiveness are reported.


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    Title :

    Acoustic Flight Tests of Rotorcraft Noise-Abatement Approaches Using Local Differential GPS Guidance


    Contributors:

    Publication date :

    1995


    Size :

    38 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Acoustic flight tests of rotorcraft noise-abatement approaches using local differential GPS guidance

    Chen, Robert T. N. / Hindson, William S. / Mueller, Arnold W. | NTRS | 1995


    Acoustic Flight Tests of Rotorcraft Noise-Abatement Approaches Using Local Differential GPS Guidance

    Chen, R. T. N. / Hindson, W. S. / Mueller, A. W. et al. | British Library Conference Proceedings | 1995


    Acoustic Flight Tests of Rotorcraft Noise-Abatement Approaches Using Local Differential GPS Guidance

    Chen, R. T. N. / Hindson, W. S. / Mueller, A. W. et al. | British Library Conference Proceedings | 1995


    Flight Tests of Noise Abatement Approaches for Rotorcraft Using Differential GPS Guidance

    Hindson, W. S. / Chen, R. T. N. / American Helicopter Society | British Library Conference Proceedings | 1995