As a sequel to Part I, this paper is directed toward the effect of turbulence in the atmosphere on the rotor blade stability during a forward flight. Two types of motion are considered: uncoupled flapping, and coupled flapping and torsion. Assuming that the turbulence velocities which appear as parametric excitations can be approximated by whit noise processes, the method of the Markov process is applied in the formulation of the problem. The results are presented as stability boundaries for the first- and second-order stochastic moments corresponding to different spectral levels of the excitations. The stability boundaries for the nonturbulence case, previously obtained from deterministic analyses, are also included for comparison. It is shown that the uncoupled flapping motion rei mains quite stable under the turbulence intensities and operating conditions, which may be reasonably expected in the service life of a helicopter, but the stability region for the coupled flapping and torsional is significantly reduced due to normal turbulence. (Jensen)


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    Title :

    Rotor blade stability in turbulent flows - Part II


    Additional title:

    Stabilitaet von Rotorfluegeln in turbulenten Stroemungen-; - Teil 2


    Contributors:
    Fujimori, Y. (author) / Lin, Y.K. (author) / Ariaratnam, S.T. (author)

    Published in:

    AIAA Journal ; 17 , 7 ; 673-678


    Publication date :

    1979


    Size :

    6 Seiten, 2 Bilder, 1 Tabelle, 8 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Rotor Blade Stability in Turbulent Flows-Part II

    Y. Fujimori / Y. K. Lin / S. T. Ariaratnam | AIAA | 1979


    Rotor blade stability in turbulent flows - Part 1

    Lin, Y.K. / Fujimori, Y. / Ariaratnam, S.T. | Tema Archive | 1979


    Rotor Blade Stability in Turbulent Flows-Part I

    Y. K. Lin / Y. Fujimori / S. T. Ariaratnam | AIAA | 1979


    The stability of rotor blade flapping motion

    Shutler, A. G. / Jones, J. P. | TIBKAT | 1961


    Computation of rotor blade flows using the Euler equations

    WAKE, B. / SANKAR, N. / LEKOUDIS, S. | AIAA | 1985