Effects of Uneven Asymmetric Ice Accretion on Aircraft Flight

The ice accretion of airplane has influence on its performance, stability ability, and dynamical response, which is also the main reason that contributes to the aviation accidents. Additionally, the uneven asymmetric ice accretion of airplane is the most dangerous one in condition of ice accretion. To find out the aircraft dynamic response and effects of flight safety in condition of uneven asymmetric ice accretion, the dynamic model, based on the 6-degree-of-freedom dynamics equation, considering the uneven asymmetric ice accretion is established to study the effect of the stability region. Moreover, compared to the change of the stability region under ice-free and evenly iced model, the influence of uneven icing on both the stability region and dynamic response characteristics of the aircraft is analyzed. Together with an exact icing severity calculation model, the asymmetric icing effect model is adopted to study the dynamic response characteristics, which is caused by asymmetric icing under different icing severities. The results of simulation demonstrate that: (1) To compared to both ice-free and even ice model, uneven icing aircraft affect the rolling and yawing moment more severity and then the stability and handling quality is reduced significantly. (2) Various dynamical response is produced by various icing severities. With the icing severities increasing by, both the aircraft control ability and aerodynamic performance are reduced badly and the values of trim aileron and rudder are becoming big.