Because communities are impacted by steady increases in aircraft traffic, aircraft noise continues to be a growing problem for the growth of commercial aviation. Research has focused on improving the design of specific high noise source areas of aircraft and on noise control measures to alleviate noise radiated from aircraft to the surrounding environment. Engine duct liners have long been a principal means of attenuating engine noise. The ability to control in-situ the acoustic impedance of a liner would provide a valuable tool to improve the performance of liners. The acoustic impedance of a liner is directly related to the sound absorption qualities of that liner. Increased attenuation rates, the ability to change liner acoustic impedance to match various operating conditions, or the ability to tune a liner to more precisely match design impedance represent some ways that in-situ impedance control could be useful. With this in mind, the research to be investigated will focus on improvements in the ability to control liner impedance using a mean flow through the liner which is referred to as bias flow.


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    Titel :

    Optimization and Control of Acoustic Liner Impedance with Bias Flow


    Beteiligte:
    H. Wood (Autor:in) / J. Follet (Autor:in)

    Erscheinungsdatum :

    2000


    Format / Umfang :

    22 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





    Bias flow adaptive acoustic liner

    Kwan, H. / Yu, J. / Beer, B. et al. | AIAA | 1999


    Experimental impedance of single liner elements with bias flow

    Follet, Jesse / Betts, Juan / Kelly, Jeffrey et al. | AIAA | 2000


    Optimization of Microphone Locations for Acoustic Liner Impedance Eduction

    Jones, Michael G. / Watson, Willie R. / June, Jason | AIAA | 2015


    Effects of Flow Profile on Educed Acoustic Liner Impedance

    Jones, Michael / Watson, Willie / Nark, Douglas | AIAA | 2010