Abstract
Flapping wing micro air vehicles are capable of hover and forward flight with high maneuverability. However, flapping wing flight is difficult to simulate accurately because it is a more complex phenomenon than fixed wing or rotorcraft flight. Consequently, the optimization of flapping wing behavior based on simulation is limited and, therefore, we have elected to optimize a wing experimentally. Specifically, we use experimental data to optimize the flapping wing structure for maximum thrust production in hover mode. We point out the similarities or otherwise between experimental optimization and the more common simulation-based optimization. Experimental optimization is hampered by noisy data, which is due to manufacturing variability and testing/measurement uncertainty in this study. These uncertainties must be reduced to an acceptable level and this requires their quantification. Therefore, improvements in manufacturing and testing procedures were implemented to reduce the noise. Another challenge is to limit the number of experiments for reducing time and cost. This is realized by using surrogates, or meta-models, to approximate the response (in this case, thrust) of the wing. In order to take into account the uncertainty, or noise, in the response, we use a Gaussian Process surrogate with noise and a 2nd order polynomial response surface. We apply a surrogate-based optimization algorithm called Efficient Global Optimization with different sampling criteria and multiple surrogates. This enables us to select multiple points per optimization cycle, which is especially useful in this case as it is more time efficient to manufacture multiple wings at once and this also serves as insurance against failed designs.
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Notes
Wing numbers were assigned to every wing we tested. Before this stage we had 20 wings from initial DOE, 20 wings from revised design space DOE, and 6 high aspect ratio wings, totaling 46.
These are actual aspect ratio values as defined by \( \frac{b^2}{S} \) and not aspect ratio numbers.
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Acknowledgments
This work was supported by Air Force Office of Scientific Research (AFOSR) grant FA9550-11-1-0066 from Dr. David Stargel, Grant Monitor. The authors would also like to thank Dr. Diane Villanueva for valuable comments and discussions on the research.
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Appendix: Length of leading edge and root for different aspect ratios of 2nd EGO cycle
Appendix: Length of leading edge and root for different aspect ratios of 2nd EGO cycle
Keeping the area of the wing constant at 2,945.2 mm2, the lengths of leading edge and root were found by calculating all the possible errors incurred in the area due to rounding off the lengths to a single decimal place and selecting the option that was closest in realizing this area constraint. The rounding off of the lengths to one decimal place was required in order to comply with the precision of the manufacturing process. The values of these lengths are given in Table 15.
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Chaudhuri, A., Haftka, R.T., Ifju, P. et al. Experimental flapping wing optimization and uncertainty quantification using limited samples. Struct Multidisc Optim 51, 957–970 (2015). https://doi.org/10.1007/s00158-014-1184-x
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DOI: https://doi.org/10.1007/s00158-014-1184-x