Reliability Optimization Design Of Aero-engine Blisk

Aero-engine aircraft is the propulsion system of aircraft which provide power for the aircraft flight. Blisk is the core member of engine. Aircraft engine blade is one parts of Aircraft engine which bear the most complex force. Blade will be affected by the unstable tail wind or causal factors(failure of combustor, guides or cooling system)during normal operation. The blades will vibrate or will produce high temperature which produce excessive deformation and stress. It is very important to study the reliability and reliability optimization of the blade.Considering the failure caused by common cause(the failure of stress and deformation caused by one factor of blade vibration), aero-engine blades vibration reliability method based on dual response surface method was put forward in order to study the aero-engine blades reliability when occurs Firstorder resonance. Passed the dual response surface, the response surface mathematical model of the blade maximum deformation and stress was established. The finite element model of the blade are instead of the response surface mathematical model of the blade maximum deformation and stress. Considering the speed, the tail gas power and material density, the blade reliability was obtained, using linkage sampling method. Compared with the Monte-Carlo method,the feasibility and applicability of the double response surface method is validated in the blade vibration reliability analysis.Considering the failure caused by common cause(multiple failure caused by local high temperature), aero-engine blades local burning reliability method based on multiple response surface method was put forward in order to study the reliability of aero-engine blade when it produce local burning in the short time. Passed the multiple response surface, four response surface model of the total deformation, radial deformation, stress and temperature were established. The finite element model of the blade are instead of four response surface model of the total deformation, radial deformation, stress and temperature. Combined with the linkage sampling method, the blade reliability was obtained. Co mpared with the Monte-Carlo method,the effectiveness of the multiple response surface method is validated in the blade local burning reliability analysis.Considering the decomposition-coordination optimization, the optimization design are used for the blisk operating parameters in order to study the optimization design of blisk operating parameters. Passed the response surface, deformation response surface model of blade and disk was established. The finite element model of the blade and the disk are instead of the blades and the disk surface mathematical models. Considering the decomposition-coordination optimization, the optimization design are used for the blisk operating parameters. Compared with the results of ordinary optimization, the superiority of the reliability optimization strategy based on decomposition and coordination is validated in the blisk operating parameters.