This report presents a review and analysis of recent aircraft flyover data where the aircraft is at a low angle of elevation relative to the observer. Excess attenuation factors (attenuation in addition to normal spherical divergence and atmospheric absorption losses), evaluated for a range of aircraft types, were found to vary between aircraft and could be generally characterized as a function of aircraft angle of elevation only. Fuselage sheidling or installation effects could not be positively identified although their presence is suggested by the differing excess attenuation characteristics of each aircraft type. Lack of detail in the data available for review precluded the identification of any propagation losses due to turbulent scattering of sound in the atmosphere. The results of the study suggest that currently applied predictive models for sideline noise tend to overestimate noise levels - particularly for 3 and 4 engine aircraft. An alternative approach to sideline noise prediction is suggested and recommendations are made to encourage technical development in this uncertain area of aircraft noise prediction. (Author)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Aircraft Sideline Noise: A Technical Review and Analysis of Contemporary Data


    Contributors:

    Publication date :

    1977


    Size :

    47 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English






    Pushing device for agricultural and sideline products

    XIE YUXIANG / LIU JUAN / LIU HENG et al. | European Patent Office | 2020

    Free access

    Anti-extrusion agricultural and sideline product transport case

    ZHANG TAO / TENG JIANBAO / ZHANG JIYONG et al. | European Patent Office | 2022

    Free access

    The Effect of Steady Intake Distortion on Fan Mpt Noise Under Sideline Flight Conditions

    Milidonis, Kypros F. / Hynes, Tom / Doherty, Martin et al. | AIAA | 2018