Research On Accident-based Safety Analysis Method For UAV Flight

This paper describes the purpose and significance of UAV accident safety analysis,and studies the current situation of UAV operation management at home and abroad.This paper introduces and validates the applicability of Markov analysis method and the principle of equivalent safety level in UAV safety analysis.Aiming at accident-based UAV safety analysis method,a safety analysis model of UAV is established and verified by an example.The main contents of this paper are:1?The process of UAV safety analysis and the work contents of each stage are introduced.Based on ARP 4671,the FHA analysis process for UAV system is proposed,and the top-down PSSA analysis and bottom-up SSA analysis process and input and output are introduced.The application stages and functions of each analysis process in UAV safety assessment are described.2?Two security analysis methods,Markov and the principle of equivalent safety level,are studied.This paper introduces the principle and process of Markov analysis method and the application of Markov analysis method in practical cases to verify its correctness in combination with the failure events of Predator UAV.This paper introduces what is the equivalent safety level,and puts forward the safety standards for UAV from the two accident situations of air impact and ground impact respectively.3?On the basis of UAV accident symptoms,AcciTree,a safety analysis model based on UAV accident,is established.This model is a graphical accident model,which can intuitively reflect the direct process of UAV accident and the unsafe factors of corresponding deep-level organization and management.The structure of the model and the safety factors for the accident are described.Process modeling process.On this basis,the associative hazard analysis method is proposed for the unsafe factors not directly shown in the accident,as a supplement to the “AcciTree”model,and its analysis process is introduced.4?Applying the AcciTree model to the actual UAV accident cases,combining with three UAV accidents,the AcciTree model is established to analyze the accident process and verify the correctness and practicability of the model.