STP671

    Methods of Gust Spectra Prediction for Fatigue Damage

    Published: Jan 1979


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    Abstract

    The prediction of aircraft responses to atmospheric turbulence using a general exponential gust exceedance equation is based on the assumption that altitude dependent spectra curve fit parameters contained in the exceedance equation are representative of the atmosphere and thus equally applicable to accelerations, loads, stresses, etc. Using vertical acceleration gust data recorded during fleet operations of the USAF C-5A transport aircraft, altitude dependent curve fit parameters were developed; these parameters were then shown to accurately predict the recorded wing stress gust experience at three wing locations, thus supporting the assumption of their uniformity between response parameters. This gust analysis then was substantiated with a second, independent analysis in which the recorded vertical acceleration gust data were converted directly to stress spectra by means of analytical stress to acceleration ratios.

    Keywords:

    damage, fatigue (materials), mathematical-predictions, gust-loads, spectrum-analysis, fatigue tests


    Author Information:

    Wilson, WW
    Structures engineers, senior, Lockheed-Georgia Co., Marietta, Ga.

    Garrett, JE
    Structures engineers, senior, Lockheed-Georgia Co., Marietta, Ga.


    Paper ID: STP35872S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP35872S


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