A flight and laboratory study of sidewall acoustic treatment for cabin noise control is described. In flight, cabin noise levels were measured at six locations with three treatment configurations. Noise levels from narrow-band analysis are reduced to one-third octave format and used to calculate insertion loss, IL, defined as the reduction of interior noise associated with the addition of a treatment. Laboratory tests used a specially constructed structural panel modeled after the propeller plane section of the aircraft sidewall, and acoustic treatments representing those used in flight. Lab measured transmission loss and absorption values were combined using classical acoustic procedures to obtain a prediction of IL. Comparison with IL values measured in flight for the boundary layer component of the noise indicated general agreement.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Investigation of fuselage acoustic treatment for a twin-engine turboprop aircraft in flight and laboratory tests


    Contributors:

    Publication date :

    1984-01-01


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English


    Keywords :



    Direct Field Acoustic Testing of a Turboprop Aircraft Fuselage

    Dal Borgo, Mattia / Musella, Umberto / Garcia de Miguel, Alberto et al. | AIAA | 2024


    Why twin-fuselage aircraft

    Houbolt, J. C. | NTRS | 1982


    In-flight acoustic measurements on a light twin-engined turboprop airplane

    Wilby, J. F. / Mcdaniel, C. D. / Wilby, E. G. | NTRS | 1985


    In-Flight Acoustic Measurements on a Light Twin-Engined Turboprop Airplane

    J. F. Wilby / C. D. McDaniel / E. G. Wilby | NTIS | 1985