Research On Structural Optimization Design Of Aero-engine Wide-chord Fan Blade

Wide-chord hollow fan blade,as the first stage of the aero-engine,provides most of the thrust for the engine.With the advantages of high efficiency,light weight and strong resistance to external damage,it is widely used in high performance of turbofan aeroengine.The structure of wide-string hollow fan blade is complex,so it is of great significance and value to explore and study the optimization design of its structure.Research on two/three-layer wide chord hollow fan blades with Superplastic forming/diffusion bonding(SPF/DB)combination forming process are studied to explore the optimal design method of fan blades,and based on this,the structural design and optimization design platform of fan blades are developed.The specific contents are as follows:Firstly,using UG secondary development technology of C/C + + programming design language,in UG environment,respectively of SPF/DB process under two/three layer structure wide string hollow fan blade was parameterized modeling,allow them to quickly generate after the size parameters of the input structure model,and based on the UI Styler and MenuScript module development platform,interactive interface design for the designers to design structure,improve the design efficiency,lay the foundation for finite element analysis and structure optimization design.Secondly,under the above relevant methods,completed two/three layer structure strength analysis of fan blade platform,allowing it to automatically generate finite element mesh,applying the boundary conditions and load,automatic solving calculation,and in order to check and optimize the structural vibration characteristics,the vibration characteristics analysis function is added here.At the same time using the platform provides solutions,respectively under the same boundary conditions and loads of different structure of the fan blade in the strength analysis and vibration analysis,provide empirical basis for further research.Finally,the realization method of optimized design of fan blade structure was studied.In combination with the characteristics of blade structure,genetic algorithmwas selected to establish an optimized design method based on UG,and a twolayer/three-layer hollow fan blade internal cavity structure optimization platform was developed.The feasibility of optimized design method of blade structure was verified by correlation calculation,and the optimal design scheme of blade structure under relevant constraints was obtained.In summary,in this work,parametric modeling,finite element analysis,structural optimization design and corresponding interactive platform of two-layer/three-layer hollow fan blade are used to realize the optimization design method of hollow fan blade,laying an important foundation for further research on structural optimization design of hollow fan blade.At the same time,the design idea and research method have reference value to the structural design of other mechanical products.