Numerical Study On Dynamic Response And Damage Of The UAV Impact Civil Aircraft

In recent years,with the popularization of UAV and the rapid increase of demand,the phenomenon of "black flying" of UAV occurs frequently,which seriously endangers aviation safety and normal flight operation.The research on the damage degree of the key parts of UAV impact civil aircraft is a new hot issue in aviation impact dynamics and aviation safety.Before that,major civil aviation powers had focused on exotic objects such as FOD(Foreign Object Debris,especially bird and hail strikes,and there were only a handful of research results on drone strikes.In this paper,according to the FAR25 bird collision airworthiness regulations,in the framework of nonlinear dynamic software ABAQUS,using the classical Lagrangian method,the numerical model of UAV impact on the key components of civil aircraft,including the UAV suction engine fan blade,is established.Simulation of UAV impact on wing leading edge and UAV impact windshield.The dynamic response law and failure damage process are obtained by calculation under different working conditions.In addition,numerical simulation of bird body impact on the front edge of wing and windshield glass was carried out under the same init ial conditions,and the results were compared with those of unmanned aerial vehicle(UAV)impact.The main work of this paper is as follows: Based on the background of the increasing number of UAVs and the frequent occurrence of black flying phenomenon,this paper introduces the topic and significance,and investigates the research status and progress of drone impact on civil aircraft at home and abroad in the mature bird collision research.Based on the analysis process of finite element simulation software ABAQUS and the Lagrangian method and SPH method,the theory of dynamic display finite element method is introduced,and the numerical calculation method of contact collision is emphasized.It lays a theoretical foundation for the subsequent establishment of the key components of the UAV impact civil aircraft and the bird collision calculation model.A model for calculating the impact of the UAV on the fan blade of the engine,the front edge of the wing and the windshield of the UAV is established,and the numerical simulation is carried out under different calculation conditions.The process of UAV impact components is analyzed and compared with bird impact.The following conclusions are obtained by simulation: the blade speed and impact position are the main factors that cause the difference of deformation and damage in the fan blade of UAV impingement engine,and the velocity causes the most obvious skin failure to the front edge of the wing of UAV impact.Under the same conditions,the equal mass UAV and bird body impact the wing front edge and windshield respectively,the UAV impact is more serious than the bird impact.The damage caused by UAV impact on the key components of civil aircraft mainly comes from the hard lithium battery and small motor embedded in the UAV.The impact response and damage failure process of UAV and bird body impact aircraft wing are analyzed and compared by numerical simulation results.This paper provides a theoretical basis and reference for improving the research on crashworthiness seaworthiness forensics of UAV colliding civil aircraft and the corresponding technical methods of conformance verification.