The Sikorsky Finite Element Airframe Vibration Analysis (Fran/Vibration Analysis) has been found to correlate well with data taken in shake tests of the CH-53A. The frequencies of fundamental fuselage bending and transmission modes were predicted by the FRAN/Vibration Analyses to an average accuracy of three percent. In addition, the mode shapes were defined accurately. The modeling techniques and analysis used in the study can be applied during helicopter design and during evaluation of growth versions of current aircraft. hese techniques, in combination with an accurate definition of the vehicle's structural characteristics, will enable accurate prediction of all transmission and fuselage modes for a vehicle without a cargo ramp. (Modified author abstract)


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    Titel :

    CH-53A Flexible Frame Vibration Analysis/Test Correlation


    Beteiligte:

    Erscheinungsdatum :

    1973


    Format / Umfang :

    245 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





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