Optimization Of Structural Parameters Of GTF Reducer And Its Dynamics Study

The increasingly serious environmental problems and energy pressure have driven the rapid development of new aero-engine technology.In the context of accelerating the research and development of key technologies for advanced aero-engines,the Geared Turbofan Engine(GTF),as a typical representative of green aero-power,has outstanding advantages in reducing fuel consumption rate and noise,and reducing pollutant emissions,and has become one of the main research directions for aero-engines.As one of the core components,the structural design and dynamics analysis of the GTF gearbox has an important impact on the lightweight,dynamic characteristics,load leveling performance and stability of the engine.In this paper,the structural parameters optimization and dynamics analysis of the GTF reducer are studied as the object.The main research contents and conclusions are as follows:(1)The structural parameters of the GTF reducer are optimized by using the response surface method and other methods.Based on the secondary development of ABAQUS in Python language,the parametric programs of input shaft,output shaft,planetary frame and torque converter assembly are prepared respectively,and the automated finite element modeling and analysis processes such as 3D model establishment,material property setting,boundary condition constraint,loading,meshing,solution calculation and post-processing of results are realized;the analysis factors of the initially selected structural parameters are designed.The significant influence factor of the structure is determined according to the Pareto diagram of standardized effects;the significant influence factor is sampled by Latin hypercube and the corresponding response variable is calculated,and the response surface model is established based on the statistical analysis results;the significant influence factor is the design variable and the response surface model is the objective function,and the optimization target is determined according to the actual performance requirements,and the structural optimization design model of the GTF reducer is established and solved.The optimal structural parameters are solved.The results show that the maximum deformation of the input shaft is increased by 213.47%,the maximum deformation of the output shaft is increased by 91.64%,the equivalent force of the assembly structure is reduced by 56.66%,and the maximum deformation is reduced by 65.41%after optimization.(2)Establish the dynamics model of the GTF reducer and introduce the optimal structural performance parameters for the dynamic analysis of the system.The calculation model is established with the integrated time-varying meshing stiffness as the excitation source of the gear pair;the kinetic model of the external meshing gear pair of the GTF reducer is established with the concentrated mass method,and the radial vibration acceleration is calculated;the power closed gear pair vibration test bench is built and the radial vibration acceleration of the gear is measured;the calculation results of the concentrated mass model are compared with the experimental results to verify the accuracy of the integrated time-varying meshing stiffness calculation The system dynamics model of the GTF gearbox was established,and the optimal structural performance parameters were introduced into the model for solution,and the system vibration response under the optimal parameters was obtained.The results show that the vibration of the optimized system is significantly reduced.The research ideas and methods in this paper provide a reference for the design and development of the complete GTF reducer,and have certain engineering application value.