Flight stability analysis of an aircraft structure is an integral part of its design phase. In particular, such investigation is also important for MAV with a flexible aerodynamic shape intended for better flight performances. In this study, a hovering ducted-fan aircraft design model with spherical membrane structure was presented and its Reynolds number was determined. Modeled as the FSI involving the aircraft aerodynamic shape, the stability of the hovering MAV was investigated using finite element analysis (FEA) and the theory of motion of structure. Moreover, in order to optimize the flight performance and stability, OED for flexible deformation has been carried out with detailed analysis. The main findings of the investigation are as follows: The thickness of the membrane and the material of the vertical duct are the two most significant factors influencing the results. Change in any of these factors will yield a significant variation in the response. However, the duct height and the airflow velocity seem to have relatively small effects on the results. Factors causing an extreme value in the results have been identified, namely, thickness of membrane, vertical duct material, membrane material, radius of vertical duct and radius of membrane. For example, the elastic deformation results appear to have a minimum value when the membrane's radius varies in the range between 60 and 90 mm. Similarly, a maximum value in the deformation occurs when the vertical duct's radius changes from 40 to 120 mm. The optimum combination of structural geometric parameters and material properties for aircraft's flexible deformation was determined as A3B2C3D3E2F1G3. The combination of 90 mm membrane radius, 80 mm duct radius, 120 mm duct height, 4 mm membrane thickness with ABS membrane and CFRP vertical duct under 18 m/s airflow speed yields better flight stability.
Optimization of the design of ductedfan hovering micro air vehicles using finite element simulation and orthogonal design
2013
10 Seiten, 13 Bilder, 5 Tabellen, 31 Quellen
Article (Journal)
English
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