HELICOPTER rotor blades, as is well known, are subjected to alternating bending stresses at various multiples of the rotor r.p.m. when the aircraft is flying forward. One of the factors determining the magnitude of the fluctuating stresses at the various frequencies is the approach to resonance between the harmonic components of the periodically varying aerodynamic loads and the natural blade frequencies. Most rotor blades are flexible enough to allow the frequencies of at any rate the lower modes, which are probably the most important, to be estimated by applying a correction for blade bending stiffness to the natural frequency of the blade if it were perfectly flexible, and subject only to inertia and centrifugal forces. It is on this latter aspect of the problem that the present article is concentrated.


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    Title :

    Natural Vibration Frequencies of Flexible Rotor Blades


    Subtitle :

    A Method Based on Consideration of Perfectly Flexible Blades


    Contributors:


    Publication date :

    1958-11-01


    Size :

    1 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Natural vibration frequencies of flexible rotor blades

    Taylor, J.L. | Engineering Index Backfile | 1958


    Resonant vibration of helicopter rotor blades

    Morris, J. / Aeronautical Research Council | TIBKAT | 1954


    Natural modes of helicopter rotor blades

    Mineck, R. E. / Weller, W. H. | NTRS | 1980


    Vibration Analysis of Rotor Blades with Pendulum Absorbers

    V. R. Murthy / C. E. Hammond | AIAA | 1981