Transfer function method for the flutter of aircraft wings with an external store
Duan Jingbo 1,2 Jiang Tao 2
1. College of Aeronautics, Northwestern Polytechnical University, Shanxi, Xi’an 710072；
2. Department of UAVEngineering, Ordnance Engineering College, Shijiazhuang, Hebei 050003
Transfer function method is applied to the flutter of aircraft wings carrying an external store. Firstly, the flutter differential equation of a clean wing is established by combining the bend-twist vibration equations of the wing and the Therdorson’ unsteady aerodynamics model. Then, the external store hung below the wing by a pitch spring is regarded as a rigid body owning a certain mass and rotary inertia. The influence of the external store on the wing flutter is introduced through the deformation harmony and internal force balance conditions. Further, using the transfer function method, the control equations are formulated in a state-space form by defining a state vector. Both the flutter velocity and flutter frequency are obtained by solving a complex eigenvalue problem. The results are good agreement with the literature solutions and the finite element method solutions, which indicates that the present method is accurate and efficient. Finally, the effects of the mass, rotary inertia, position and pitch stiffness of the pylons are investigated.
段静波1,2，江涛2. 带外挂机翼颤振分析的传递函数方法[J]. 振动与冲击, 2017, 36(10): 109-116.
Duan Jingbo 1,2 Jiang Tao 2 . Transfer function method for the flutter of aircraft wings with an external store. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(10): 109-116.
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