The use of Helmholtz resonators to increase the sidewall transmission loss (TL) in aircraft cabin sidewalls is evaluated. Development, construction, and test of an aircraft cabin acoustic enclosure, built in support of the Propfan Test Assessment (PTA) program, is described. Laboratory and flight test results are discussed. Resonators (448) were located between the enclosure trim panels and the fuselage shell. In addition, 152 resonators were placed between the enclosure and aircraft floors. The 600 resonators were each tuned to a propfan fundamental blade passage frequency (235 Hz). After flight testing on the PTA aircraft, noise reduction (NR) tests were performed with the enclosure in the Kelly Johnson Research and Development Center Acoustics Laboratory. Broadband and tonal excitations were used in the laboratory. Tonal excitation simulated the propfan flight test excitation. The resonators increase the NR of the cabin walls around the resonance frequency of the resonator array. Increases in NR of up to 11 dB were measured. The effects of flanking, sidewall absorption, cabin absorption, resonator loading of trim panels, and panel vibrations are presented. Resonator and sidewall panel design and test are discussed.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Development and Testing of Cabin Sidewall Acoustic Resonators for the Reduction of Cabin Tone Levels in Propfan-Powered Aircraft (Final Report, October 1986 - December 1990)


    Beteiligte:
    H. L. Kuntz (Autor:in) / R. J. Gatineau (Autor:in) / R. A. Prydz (Autor:in) / F. J. Balena (Autor:in)

    Erscheinungsdatum :

    1991


    Format / Umfang :

    162 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch






    Cabin Noise Weight Penalty Requirements for a High-Speed Propfan-Powered Aircraft - A Progress Report

    Balena, F. J. / Revell, J. D. / Prydz, R. A. | SAE Technical Papers | 1982



    Aircraft cabin

    MIEDEMA JOOST | Europäisches Patentamt | 2022

    Freier Zugriff