The NASA goal of reducing external aircraft noise by 10 dB in the near-term presents the acoustics community with an enormous challenge. This report identifies technologies with the greatest potential to reduce airframe noise. Acoustic and aerodynamic effects will be discussed, along with the likelihood of industry accepting and implementing the different technologies. We investigate the lower bound, defined as noise generated by an aircraft modified with a virtual retrofit capable of eliminating all noise associated with the high lift system and landing gear. However, the airframe noise of an aircraft in this 'clean' configuration would only be about 8 dB quieter on approach than current civil transports. To achieve the NASA goal of 10 dB noise reduction will require that additional noise sources be addressed. Research shows that energy in the turbulent boundary layer of a wing is scattered as it crosses trailing edge. Noise generated by scattering is the dominant noise mechanism on an aircraft flying in the clean configuration. Eliminating scattering would require changes to much of the aircraft, and practical reduction devices have yet to receive serious attention. Evidence suggests that to meet NASA goals in civil aviation noise reduction, we need to employ emerging technologies and improve landing procedures; modified landing patterns and zoning restrictions could help alleviate aircraft noise in communities close to airports.


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    Titel :

    Airframe Noise Reduction Challenge


    Beteiligte:
    D. P. Lockhard (Autor:in) / G. M. Lilley (Autor:in)

    Erscheinungsdatum :

    2004


    Format / Umfang :

    31 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    The Airframe Noise Reduction Challenge

    Lockard, David P. / Lilley, Geoffrey M. | NTRS | 2004


    Progress in Airframe Noise Reduction

    Ross, J. / Canadian Aeronautics and Space Institute | British Library Conference Proceedings | 2001


    Airframe Noise Reduction Status and Plans

    M. R. Khorrami | NTIS | 2011


    Airframe Noise Reduction Status and Plans

    Khorrami, Mehdi R. | NTRS | 2011


    Airframe noise

    Scarpa, Fabrizio | Emerald Group Publishing | 2001