Interim status report of continuing program to reduce perceived noise levels (PNL's) on ground below takeoff and landing approach paths of turbofan-powered commercial transports; program is directed principally toward development of fan-inlet and exhaust ducts incorporating acoustically absorptive linings; ground and flight tests have been performed on experimental design evolved by incorporating linings within basic "short" fan-discharge duct design of transport aircraft; results obtained show that improved lining designs are needed to provide acceptable service life; summaries of experimental and analytical studies conducted concurrent with design, fabrication, and testing of experimental ducts are also presented.


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    Title :

    Turbofan-engine noise suppression


    Additional title:

    J Aircraft


    Contributors:
    Pendley, R.E. (author) / Marsh, A.H. (author)

    Published in:

    Publication date :

    1968


    Size :

    6 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Turbofan-engine noise suppression

    MARSH, A. | AIAA | 1967


    Turbofan-engine noise suppression.

    MARSH, A. H. | AIAA | 1968


    Turbofan-engine noise suppression.

    Marsh, A. H. / Pendley, R. E. | NTRS | 1967


    Turbofan-engine noise suppression

    MARSH, A. | AIAA | 1966


    Turbofan-engine noise suppression.

    Marsh, A. H. / Pendley, R. E. | NTRS | 1968