Zhang Chao, He Jingwu , Xie Changchuan, Liu Yi
DOI Number: N/A
Conference number: IFASD-2015-076
Due to the large size of large commercial aircrafts and extensive use of lightweight materials, the structural flexibility is quite significant. In fact, the large aspect ratio wing makes aeroelastic problems particularly prominent. What’s worse, the wing will have a great deformation even when the aircraft is in a straight level flight (more than 10% of half wingspan). It will cause the effects of structure geometrical nonlinearity and aerodynamics of curved wing, which make the flight loads, flutter and other static and dynamic aeroelastic problems highlighted. In this paper, the geometrical nonlinear aeroelasticity theory for large aircraft considering large deformation and the aerodynamics for curved wing is introduced firstly. The steady aerodynamic model of wing in large deformation is established by steady vortex lattice method and the unsteady aerodynamic model is set up by curved double-lattice method. These two methods are combined with surface spline interpolation to acco mplish geometrically nonlinear aeroelastic trim analysis. Further method of nonlinear flutter is studied and nonlinear flutter characteristics of the wing with engine are analyzed.