Estimation of fuselage vibration is one of the most challening tasks in the rotorcraft field since it requires sophisticated mathematical modeling of both airframe and rotor and specialized analysis procedure. Currently, most studies incorporate either simple rotor modeling or simple body modeling to predict vibration. The present study is directed towards assessing various mathematical models of rotors and airframe to develop rotor-body coupled vibration analysis. For this purpose, five rotor models ranging from simple rigid flap model to nonlinear coupled flap-lag-torsion-axial elastic model, and three airframe models ranging from six degree of freedom rigid model to distributed elastic line model are formulated. The rotor-body coupling is achieved through an implicit procedure. For numerical study, an elastic line model of the Bell Huey AH-1G helicopter airframe is coupled to a four bladed soft-inplane hingeless rotor. The study shows simpler blade models over-predict vibration along vertical, pitch, and roll directions and under-predict vibration along longitudinal, lateral, and yaw directions. For proper accounting of rotor-body coupling effects, it is necessary to include a detailed elastic model of airframe.


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    Title :

    Effect of modeling techniques in the coupled rotor-body vibration analysis


    Additional title:

    Die Auswirkungen der Auslegungstechnik in der gekoppelten Schwingungsanalyse von Rotor und Flugzeugrumpf


    Contributors:


    Publication date :

    1993


    Size :

    13 Seiten, 4 Bilder, 21 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    EFFECT OF MODELING TECHNIQUES IN THE COUPLED ROTOR-BODY VIBRATION ANALYSIS

    VELLAICHAMY, SENTHILVEL / CHOPRA, INDERJIT | AIAA | 1993



    Coupled rotor/airframe vibration analysis

    Sopher, R. / Studwell, R.E. / Cassarino, S. et al. | Tema Archive | 1982



    Rotor System Health Monitoring Using Coupled Rotor-Fuselage Vibration Analysis

    Yang, M. / Chopra, I. / Haas, D. et al. | British Library Conference Proceedings | 2000