Body Freedom Flutter of Carried Flyer on a Twin-Fuselage Aircraft

Body freedom flutter of carried flyers need to be investigated when such flyers are hung on the elastic structures of twin-fuselage aircraft (TFA). Due to the unique structural layout, the structural dynamics of TFA might be coupled with the aerodynamic loads on the flyer which leads to a special flutter behavior. In this behavior, the structural flexibility of the flyer could be neglected, while the flyer’s motion attributes to the TFA’s dynamics. In this work, the body freedom flutter of carried flyer is studied using p-k method in frequency domain. The structural model is established utilizing finite element beams. The aerodynamic loads are evaluated by doublet-lattice method. The coupling of structure and aerodynamics is established through displacement integration. The dynamic characteristics of TFA is compared with traditional single-fuselage aircraft with the same wing aspect ratio. The mode coalescence between the plunge and pitching of the flyer is found in the TFA aeroelastic system. These modes of flyer motion attribute to the vibration of the middle wing in TFA.