A numerical methodology for the aerodynamic damping analysis of fibre reinforced rotors under consideration of varying stiffness due to damage is proposed. Therefore continuum damage mechanics approaches for textile reinforced composites are applied to composite rotors for the description of anisotropic damage evolution resulting in locally varying stiffness and strength. In order to take account of aeroelastic coupling, the aerodynamic influence coefficients (AIC) technique has proved to be a well-suited and simple method for isotropic and homogeneous rotors but not yet fully developed for anisotropic and locally damaged composite rotors. To step further a first valuable combination of a simplified interaction model for vibrating structures and fluids and the modal analysis of polar orthotropic disk rotors is presented. Damping ratios are calculated in dependence on the acoustic impedance and therefore on fluid pressure and temperature and reasonable results are achieved.