An aircraft system noise assessment was performed for the hybrid wing body aircraft concept, known as the N2A-EXTE. This assessment is a result of an effort by NASA to explore a realistic HWB design that has the potential to substantially reduce noise and fuel burn. Under contract to NASA, Boeing designed the aircraft using practical aircraft design princip0les with incorporation of noise technologies projected to be available in the 2020 timeframe. NASA tested 5.8% scale-mode of the design in the NASA Langley 14- by 22-Foot Subsonic Tunnel to provide source noise directivity and installation effects for aircraft engine and airframe configurations. Analysis permitted direct scaling of the model-scale jet, airframe, and engine shielding effect measurements to full-scale. Use of these in combination with ANOPP predictions enabled computations of the cumulative (CUM) noise margins relative to FAA Stage 4 limits. The CUM margins were computed for a baseline N2A-EXTE configuration and for configurations with added noise reduction strategies. The strategies include reduced approach speed, over-the-rotor line and soft-vane fan technologies, vertical tail placement and orientation, and modified landing gear designs with fairings. Combining the inherent HWB engine shielding by the airframe with added noise technologies, the cumulative noise was assessed at 38.7 dB below FAA Stage 4 certification level, just 3.3 dB short of the NASA N+2 goal of 42 dB. This new result shows that the NASA N+2 goal is approachable and that significant reduction in overall aircraft noise is possible through configurations with noise reduction technologies and operational changes.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Noise Scaling and Community Noise Metrics for the Hybrid Wing Body Aircraft



    Conference:

    AIAA/CEAS Aeroacoustics Conference ; 2014 ; Atlanta, GA, United States


    Publication date :

    2014-06-16


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Noise Scaling and Community Noise Metrics for the Hybrid Wing Body Aircraft

    Burley, Casey L. / Brooks, Thomas F. / Hutcheson, Florence V. et al. | AIAA | 2014


    Noise Scaling and Community Noise Metrics for the Hybrid Wing Body Aircraft

    C. L. Burley / T. F. Brooks / F. V. Hutcheson et al. | NTIS | 2014


    Hybrid Wing–Body Aircraft Slat Noise

    Guo, Yueping / Brusniak, Leon / Czech, Michael et al. | AIAA | 2013


    Hybrid Wing-Body Aircraft Slat Noise

    Guo, Y | Online Contents | 2013


    Hybrid wing-body aircraft noise and performance assessment

    Weed, Philip Andrew | DSpace@MIT | 2010

    Free access