Design And Optimization Of Flexible Airfoil Mechanism With Variable Bending

With the development of aerospace basic research,it is possible to develop a wing that is as flexible as a bird’s wings.However,the development of variable-angle wings over the years has been mostly limited to traditional rigid materials and driving methods.More researchers use complex mechanisms to achieve deformation but increase the weight of the wing,and the wing improvement is not worth the effort.Therefore,there is an urgent need to explore the wing material and driving direction.In this thesis,a flexible wing with a shape-memory alloy wire driver that can achieve the varying spanwise curvature and swept angle and a variable camber flexible wing are designed.The flexible hinges of the wing are mechanically modeled,and the influence of the critical dimensions on the flexibility of the mechanism is analyzed.The calculation results were verified by finite element simulation.In addition,the uneven deformation of the shape memory alloy wire was analyzed,and the heating method of the shape memory alloy wire was improved and tested experimentally.By designing the MATLAB program,the structure design of the flexible wing based on the variable density topology optimization algorithm is carried out.The optimization results are extracted and reconstructed,and the finite element simulation analysis is carried out to verify the optimization results.A drive mechanism capable of simultaneously driving the deformation of the front and rear edges of a plurality of ribs is designed.In order to verify the feasibility of the variable-bend flexible wing designed in this thesis,a flexible wing prototype was designed and fabricated,and the wing bending,grazing angle and chord-direction bending performance were tested and tested.The experimental results show that the flexible wing designed in this thesis has a certain degree of camber deformation ability,which can basically achieve the continuous smooth deformation of the wing and has high rigidity.It has made some attempts for the further study of the flexible wing with flexible bending.