Time- and frequency-domain analyses are used to revisit a well studied case of an aeroelastic wing with control-surface freeplay nonlinearity. The dynamic response in general is presented as dependent on the stability of two linear systems, with zero and nominal control-surface rotational stiffness, and values of two angles, freeplay and preload. The principal new findings include the following. A physical explanation is given to the bifurcation airspeeds and frequencies of the oscillations for the system with both zero and nonzero aerodynamic preload of the control surface. For the latter and more complex case, it is shown and explained why a certain amount of the preload is not only always destabilizing but may also be the reason for the otherwise unexpected higher-frequency oscillations. A conclusion thus is drawn that the aircraft control-surface freeplay analyses based only on zero and high quenching aerodynamic preloads are nonconservative. All results are compared with the experimental and other published theoretical analyses for the considered model. Finally, a suggestion is given for future experiments with a goal to observe the response changes with the preload and to determine the stabilizing control-surface hinge moment.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Nature of Freeplay-Induced Aeroelastic Oscillations


    Contributors:

    Published in:

    Journal of Aircraft ; 51 , 2 ; 571-583


    Publication date :

    2014-03-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Nature of Freeplay-Induced Aeroelastic Oscillations

    Kholodar, D B | Online Contents | 2014



    REVIEW ON NONLINEAR AEROELASTIC ANALYSIS WITH FREEPLAY

    Sun, Y. / Han, Z. / Cao, H. et al. | DataCite | 2024


    Complete Bifurcation Behaviour of Aeroelastic Systems with Freeplay

    Dimitriadis, G. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2011