A mathematical model for sound transmission into a thin cylindrical shell is used to study sound transmission under flight conditions, i.e., under conditions of external air flow past a pressurized cylinder at flight altitude. Numerical results for different incidence angles are presented for a typical narrow-bodied jet in cruising flight at 10,660 m with interior pressure at 2440 m. A comparison is made between no-flow sound transmission at standard conditions on the ground to sound transmission under flight conditions. It is shown that at M = 0, the cylinder transmission loss (TL) has dips at the cylinder ring frequency (fR) and the critical frequency (fc) for a flat panel of same material and thickness as shell. Between fR and fc, cylinder TL follows a mass-law behavior. Flow provides a modest increase in TL in the mass-law region, and strongly interacts with the cylinder resonances below fR.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    On sound transmission into a thin cylindrical shell under 'flight conditions'


    Contributors:

    Conference:

    Acoustical Society of America, Meeting ; 1975 ; San Francisco, CA


    Publication date :

    1975-11-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English