Existing interior noise reduction techniques for aircraft fuselages perform reasonably well at higher frequencies, but are inadequate at low frequencies, particularly with respect to the low blade passage harmonics with high forcing levels found in propeller aircraft. A method is studied which considers aircraft fuselages lined with panels alternately tuned to frequencies above and below the frequency that must be attenuated. Adjacent panel would oscillate at equal amplitude, to give equal acoustic source strength, but with opposite phase. Provided these adjacent panels are acoustically compact, the resulting cancellation causes the interior acoustic modes to be cut off, and therefore be nonpropagating and evanescent. This interior noise reduction method, called Alternate Resonance Tuning (ART), is being investigated theoretically and experimentally. Progress to date is discussed.


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    Titel :

    Interior noise reduction by alternate resonance tuning


    Beteiligte:

    Erscheinungsdatum :

    01.08.1987


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Aircraft Interior Noise Reduction by Alternate Resonance Tuning

    D. B. Bliss / J. A. Gottwald / R. Srinivasan et al. | NTIS | 1990


    Aircraft interior noise reduction by alternate resonance tuning

    Bliss, Donald B. / Gottwald, James A. / Srinivasan, Ramakrishna et al. | NTRS | 1990


    Aircraft interior noise reduction by alternate resonance tuning

    Bliss, Donald B. / Gottwald, James A. / Gustaveson, Mark B. et al. | NTRS | 1989