STRUCTURAL DYNAMICS OF COMPOSITE WINGS

The dynamic behaviour of a composite wing structure is studied. By com puting strain-energy, kinetic energy and work of external loads, and b y using Minimum Principles, differential matrix equations of the struc ture are written, where displacements play the role of degrees of free dom. By dividing the wing into a certain number of spanwise elements, two different methods can be used: FEM, (where descriptive functions f or every element are given), and CEM (continuous elements) where the e quations of the structure an solved for each element, and then continu ity conditions are imposed. Several numerical examples complete the wo rk; CEM and FEM are compared, and the influence of several parameters, in particular anisotropy, is considered.