Studying Body-Freedom Flutter Mechanism via a Rigid-Elastic Aeroelastic Model of Reduced-Order
Qitong Zou, Rui Huang, Haiyan Hu, Haojie Liu
Abstract: The paper presents a rigid-elastic aeroelastic model of reduced-order for a flying-wing aircraft to reveal the interaction mechanism of a body-freedom flutter and optimize the structural parameters at the initial design stage of the flying-wing aircraft. The model proposed includes the effect of the sweep-back angle, the aerodynamic forces of the wing and fuselage, and the structural dynamics. To verify the accuracy of the model, the paper offers numerical simulations of body-freedom flutter characteristics compared with the flight tests of a flying-wing aircraft. Then, the paper addresses the interaction mechanism of body-freedom flutter by combining the flight test phenomenon with the simplified model from a modal perspective and gives the consequence of related structural parameters on the body-freedom flutter for guidance in a structural design. The results indicate that the short-period mode, plunge mode, bending mode, and torsion mode of the aircraft played a joint role in the body-freedom flutter analysis. In addition, the sweep-back angle and the centers of gravity had significant influenced on the static stability of the aircraft, and the stability transition in the static equilibrium point was extremely rapid and dangerous.
文章链接：https://www.sciencedirect.com/science/article/pii/S1270963825002263
