S Irani - Assistant Professor
M.R Amoozgar - M.sc Student, Department of Aerospace Engineering, Khaje Nasir Toosi University

The bending- Torsional flutter characteristics of a swept composite wing containing an arbitrarily mass are presented. The wing performs as a classical beam. The governing equations are determined via Lagrange’s principle. In order to precisely consider the spanwise and chordwise location and the properties of the attached mass, the generalized function theory is used. Unsteady Theodorson aerodynamic theory in time domain, is used. The general laminate composite theory is used for modeling the effects of ply angles on the flutter characteristics. The Ritz method is subsequently applied to convert the partial differential equations into a set of ordinary differential equations. Dirac delta function is used in order to precisely consider the location and properties of the attached mass. Moreover, the numerical results are compared with the published results and excellent agreement is observed. The numerical simulations indicating the significant effects of the sweep angle, external mass parameters such as the mass ratio and the attached locations and the ply angles on the flutter boundaries are presented.

Swept wing; attached mass; flutter boundary; composite wing, unsteady aerodynamic