Research on Airworthiness Compliance Verification Method for Damage to Civil Aircraft Tail Wings Caused by Ice Shedding

The ice accumulation on the surface of the aircraft may fall off due to aerodynamic force, mechanical vibration, change of temperature and other reasons, causing serious damage to the downstream parts of the aircraft and constituting a flight safety hazard. To solve this risk problem, based on MC3 risk assessment method, this paper studies the discrete source damage behavior caused by ice fall on the tail of civil aircraft, and establishes the corresponding airworthiness compliance verification method system. Based on the icing and shedding of the wing surface, the critical ice type of the wing surface is determined by calculating the three-dimensional flow field data, and the ice shedding trajectory prediction model is established. Then, the constitutive model of the ice under high-speed impact is analyzed, and the finite element model of the impact of the ice on the tail is established, considering the impact velocity, attitude and impact Angle of the ice on the structural response of the tail. Finally, the system risk value of ice falling off on the tail under different impact conditions is introduced, and the airworthiness compliance verification method of ice falling off on the tail discrete source damage is established. This paper takes A380 aircraft as an example to verify the airworthiness compliance of tail damage caused by ice shedding under typical icing weather conditions, and proves the applicability of the airworthiness compliance verification method system. The method system combines experimental testing and simulation technology, which provides important theoretical support and verification method for the safe flight of aircraft.