Research On The Design Method Of Helicopter Rotor Blade Structure And Dynamics Based On 3D Printing Technology

The blade is an important part of the helicopter rotor system,and the most commonly used blade is made of composite material.Study shows that the light weight lattice structure possess high strength mechanical properties.Additive manufacturing technology presents a novel strategy of helicopter blade design and fabrication,in this strategy,the blade structures and skin are designed with lattice structures,and then fabricated by additive manufacturing.This paper focuses on the structural design and dynamic design of 3D printed lattice blades,including:(1)Parametric modeling method of 3D printed lattice structure blades.The mechanical properties of lattice structures of several different configurations are compared in detail.A parametric description and modeling method of 3D printing lattice structure blade is presented,and the parametric structure modeling and finite element modeling program of 3D printed blade are established based on ANSYS APDL language.Through the second development programming of CATIA,the 3D solid model design of 3D printed blade is completed.(2)Analysis of mechanical properties of 3D printing blade and optimization of frequency placement.Based on the parameterized model,the finite element analysis process is established,and the strength and stability of the 3D printed blade are analyzed.The integration and optimization of Beam program,ANSYS and Isight is realized based on multi-island genetic algorithm.With blade fill lattice structure features and skin thickness as the design parameters,such as blade quality,strength safety coefficient,load factor as constraint,the crystal structure of 3D printing FM optimization design was carried out on the blade,optimal design parameters are obtained.(3)Blade forming and experimental research.Using aluminum alloy blade,3D printing forming model and 3D printing blade experiment research,including the static deformation measurement,natural frequency and rotor rotating experiment and aerodynamic performance measurement.Through the experiment,the performance of the aluminum alloy 3D printed blade is proved to meet the requirements,the experimental measurement is in good agreement with the analysis results,and the effectiveness of the design method is verified.