An estimate is made of the aircraft interior noise produced by high subsonic turbulent wall pressures interacting with a a fuselage skin step formed when adjacent, elastic panels overlap. The panels are modelled as thin elastic plates bonded in the vicinity of the step, and clamped along a line transverse to the mean flow direction. Sound is produced by scattering of the turbulence induced flexural skin motions at the clamp line, and by interaction of the turbulence pressure with the step. The skin step component is found to be significant at high frequencies, above the convective resonance frequency of the panels (at which the turbulence convection velocity equals the flexural wave speed). At typical cruise Mach numbers, however, when boundary layer generated sound is believed to dominate interior cabin noise, the critical frequency above which skin step noise is important is of the order of 10 kHz, which is beyond the range of interest in practice. The critical frequence is much lower at take-off and landing approach conditions, but the turbulent boundary layer is then a relatively unimportant contributor to cabin noise.


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    Titel :

    On the contribution from skin steps to boundary-layer generated interior noise


    Beteiligte:
    Howe, M.S. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1998


    Format / Umfang :

    12 Seiten, 6 Bilder, 1 Tabelle, 22 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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    Howe, M.S. / Shah, P.L. | Tema Archiv | 1995


    Influence of mean flow on boundary layer generated interior noise

    Howe, M.S. / Shah, P.L. | Tema Archiv | 1996


    On the boundary layer contribution to wayside noise generated by high-speed tracked vehicles

    King, W. F. / Institute of Noise Control Engineering, Japan / Acoustical Society of Japan et al. | British Library Conference Proceedings | 1994


    Boundary-layer-induced noise in interior of aircraft

    Ribner, H.S. | Engineering Index Backfile | 1956