The noise shielding potential of an inboard-wing catamaran aircraft when coupled with distributed propulsion is examined. Here, only low-frequency jet noise from mid-wing-mounted engines is considered. Because low frequencies are the most difficult to shield, these calculations put a lower bound on the potential shielding benefit. In this proof-of-concept study, simple physical models are used to describe the 3-D scattering of jet noise by conceptualized catamaran aircraft. The Fast Scattering Code is used to predict noise levels on and about the aircraft. Shielding results are presented for several catamaran type geometries and simple noise source configurations representative of distributed propulsion radiation. Computational analyses are presented that demonstrate the shielding benefits of distributed propulsion and of increasing the width of the inboard wing. Also, sample calculations using the FSC are presented that demonstrate additional noise reduction on the aircraft fuselage by the use of acoustic liners on the inboard wing trailing edge. A full conceptual aircraft design would have to be analyzed over a complete mission to more accurately quantify community noise levels and aircraft performance, but the present shielding calculations show that a large acoustic benefit could be achieved by combining distributed propulsion and liner technology with a twin-fuselage planform.


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    Title :

    Low-Noise Potential of Distributed Propulsion on a Catamaran Aircraft


    Contributors:
    J. W. Posey (author) / A. F. Tinetti (author) / M. H. Dunn (author)

    Publication date :

    2006


    Size :

    13 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    The Low-Noise Potential of Distributed Propulsion on a Catamaran Aircraft

    Posey, Joe / Tinetti, Ana / Dunn, Mark | AIAA | 2006


    The Low-Noise Potential of Distributed Propulsion on a Catamaran Aircraft

    Posey, Joe W. / Tinetti, A. F. / Dunn, M. H. | NTRS | 2006


    AIAA-2006-2622 The Low-Noise Potential of Distributed Propulsion on a Catamaran Aircraft

    Posey, J. / Dunn, M. / Tinetti, A. et al. | British Library Conference Proceedings | 2006