Optimization of aerodynamic efficiency for twist morphing MAV wing |
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Authors: | N. I. Ismail A. H. Zulkifli M. Z. Abdullah M. Hisyam Basri Norazharuddin Shah Abdullah |
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Affiliation: | a Faculty of Mechanical Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia; b School of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal 14300, Malaysia; c School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal 14300, Malaysia |
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Abstract: | Twist morphing (TM) is a practical control technique in micro air vehicle (MAV) flight. However, TM wing has a lower aerodynamic efficiency (CL/CD) compared to membrane and rigid wing. This is due to massive drag penalty created on TM wing, which had overwhelmed the successive increase in its lift generation. Therefore, further CL/CDmax optimization on TM wing is needed to obtain the optimal condition for the morphing wing configuration. In this paper, two-way fluid-structure interaction (FSI) simulation and wind tunnel testing method are used to solve and study the basic wing aerodynamic performance over (non-optimal) TM, membrane and rigid wings. Then, a multifidelity data metamodel based design optimization (MBDO) process is adopted based on the Ansys-DesignXplorer frameworks. In the adaptive MBDO process, Kriging metamodel is used to construct the final multifidelity CL/CD responses by utilizing 23 multi-fidelity sample points from the FSI simulation and experimental data. The optimization results show that the optimal TM wing configuration is able to produce better CL/CDmax magnitude by at least 2% than the non-optimal TM wings. The flow structure formation reveals that low TV strength on the optimal TM wing induces low CD generation which in turn improves its overall CL/CDmax performance. |
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Keywords: | Aerodynamics Fluid structure interaction Micro air vehicle Optimization Twist morphing |
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