Study On Structural Strength Reliability Of Civil Aircraft Pylon

Aircraft engine pylon is one of the most important structural components of the civil aircraft.The pylon directly affects the safety of the engine and the whole aircraft,therefore it is necessary to analyze the reliability of the pylon.Based on strength analysis of the finite element model of pylon,structural strength reliability and sensitivity analysis were carried out,the optimized sized pylon was obtained.The main contents are as follows:The reliability allocation method considering importance and complexity and the equal allocation method were used to obtain the initial reliability design indicators of pylon.The strength reliability experiment of metal specimens was designed.Comparing with the simulation results,simulation calculation was proved to have higher precision.Furthermore,by comparing static strength calculation results of three different type of finite element modeling(FEM)model of pylon,a more accurate beam model was selected for subsequent research.By using the probability design(PDS)module of ANSYS software,the structural strength reliability and sensitivity results were obtained under the limit load conditions.By comparing the reliability results with the initial reliability design indicators obtained by allocation,the high reliability of the pylon was proved.Based on the sensitivity analysis of pylon,the design variables were screened.The structure sizes of the pylon were optimized by using optimization design(OPT)module of ANSYS,on the basis of the increase of structural strength reliability,the mass of pylon was reduced by 8.98%.The rationality of the optimized pylon was proved and the optimized structure size was obtained.