The Risk Identification And Consequence Simulation Study Of The Final Assembly Of An Aerospace Product

In order to study the danger in the final assembly of aerospace products and to control the risk of ignition and explosion accidents.Starting from the operation procedure of the assembly of solid motor,a systematic and comprehensive risk analysis and evaluation method is studied for each working procedure.First of all,through the method of job safety analysis（JSA）for aerospace products assembly process for hazard identification.The task decomposition,identify the dangerous and harmful factors in each process and qualitative analysis of possible accident consequences.Then the accident tree analysis（FTA）is used to analyze the dangerous engine fire and explosion accidents,gas fire and ignition device fire and explosion accidents in the process of final assembly.The probability of occurrence of basic events was obtained through human electrostatic experiment and expert analogy scoring method,and the accident tree was further quantitatively analyzed.The results show that the maximum probability of combustor ignition accident is 1.068×10^-4/year,and eleven basic events that need to be controlled are obtained.Secondly,in the process of analysis,in order to study the intra-boundary individual risk suffered by personnel of each position,this paper puts forward a quantitative evaluation method of individual risk analysis for personnel of each position,and carries out individual risk analysis for each process of final assembly operation.Analysis found that the main kinds of risks in the process of assembly operations personnel from mechanical damage,the post individual risk maximum 2.88×10^-5,the main reason is the insufficient protection does not reach the designated position and personnel safety consciousness.At the same time,it is found that mechanical equipment failure and human error are the main causes of ignition and explosion accidents.According to the ALARP criterion,the risk value in the final assembly of the aerospace product is within an acceptable range.Finally,the simulation analysis of the accident consequences of combustion chamber was conducted by FLUENT software,and the thermal radiation damage range of combustion chamber accidents at different stations was obtained.And through the LOPA methods of assembly work effectiveness and explosion consequences for protective measures in the process of research,the need to focus on control of 11 basic event for protection.By putting forward the corresponding protective measures,the probability of combustion chamber explosion accident was reduced to 3.561×10^-6/year,effectively preventing the occurrence of the accident.According to the research results of this paper,according to the characteristics of the final assembly of aerospace products,the evaluation method selected and proposed in this paper is more suitable.It has effectively completed the work of risk identification and risk analysis in the operation process,and has a good guiding role in the standard operation and safety production of the final assembly of aerospace products.