Measurements were made at nine locations to determine the frequency and level of the structure-borne noise in the airframe of a large jet aircraft during flight. The purpose of the measurements was to determine the feasibility from a noise limiting standpoint of using acoustic emission techniques to detect onset of fatigue damage. Measurements were made on four flights at both 10000 and 20000-feet altitude. Test results show that structure-borne noise will prevent the use of an acoustic emission system which operates above 500 kHz. The center wing and the vertical stabilizer areas exhibited below moderate noise levels. The high-noise area may require AE systems which operate at or above 1.0 MHz to achieve a signal-to-noise ratio of 2.


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    Title :

    Acoustic emission structure - borne background noise measurements on aircraft during flight


    Additional title:

    Akustische Emission bei Geraeuschmessungen in Flugzeugen waehrend des Fluges


    Contributors:
    Bailey, C.D. (author) / Pless, W.M. (author)

    Published in:

    Materials Evaluation ; 34 , 9 ; 189-201


    Publication date :

    1976


    Size :

    8 Seiten, 9 Bilder, 1 Tabelle, 2 Quellen


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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    W. H. Lewis / C. D. Bailey / W. M. Pless | NTIS | 1976



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