A low-order phenomenological model relating dynamic wing motion to thrust production of micro flapping wings with different stiffness was examined. The motivation is toward closed-loop flight control of flapping micro air vehicles. The low-order model was based on a "black box" state-space description that used the intraperiod flapping-wing motion as input to determine modeling coefficients that minimized the error between the predicted and actual intracycle thrust. The data time series used in the modeling were provided by a companion experiment with three flapping wings of different designs and stiffness. The wings were fabricated from laminated carbon-fiber strips that were covered by a thin polyvinylidene fluoride film sheet. The wings had a span of 12.5 cm and were attached to a commercial Cybird gearbox that could be operated at different flapping frequencies. Digital high-speed video was used to determine the dynamic displacement of the wing structure. The intraperiod wing displacement was quantified using digital image processing of each video frame. The low-order model successfully captured the dynamic thrust generation within a flapping cycle and produced the correct scaling of the peak thrust with flapping frequency for all three wing designs. The model mean thrust frequency scaling agreed with the experiments if the peak thrust was within approximately 40% of the cycle-averaged thrust. A modification of the model is suggested when that difference is too large.


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    Title :

    Experiments and Modeling of Micro Flapping Wings of Different Designs in Hover


    Contributors:

    Published in:

    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.50 Luftfahrzeugtechnik / 55.60 Raumfahrttechnik / 55.60 / 50.93 / 55.50 / 50.93 Weltraumforschung
    Local classification TIB:    770/7040



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