Researchers both domestically and abroad have done little research on the effect of stiffness on the aeroelasticity of the wing and have not conducted any systematic research.
Through a large number of analyses and experimental results on a two-dimensional airfoil, it has been shown that if the torsional and bending stiffnesses of the wing are simultaneously increased by n times, the flutter critical velocity of the wing will be accordingly increased by times. The flutter of the wing is severely restricted by the bending and torsional stiffness of the wing’s cross section. The effect of stiffness needs to be factored into the design of a high aspect ratio wing (HARW). The greater the aircraft’s flight speed is, the more severe the stiffness affects the wing limit cycle oscillation (LCO) amplitude. Increasing the stiffness in the range of 0.4 to 0.6 Mach has a greater impact on the flutter critical velocity, which increases by 12.03%. The results show that, compared with the original wing, when the bending stiffness and torsional stiffness of the wing along the spanwise direction increase by 8.28% and 5.22%, respectively, the amplitude of the flutter decreases by approximately 30%. The load is calculated using a computational fluid dynamics (CFD) solver. We use the fluid-structure coupling method to analyze the flutter characteristics of the wing, and we use our research results based on the corotational (CR) method to perform structural calculations. Based on the calculation theory of the mechanical profile of thin-walled structures, the torsional stiffness and bending stiffness of the wing are obtained through calculation. Based on this, this paper presents an effective method to determine the effect of the stiffness on the flutter characteristics of HARWs. High aspect ratio wing (HARW) structures will deform greatly under aerodynamic loads, and changes in the stiffness will have a great impact on the flutter characteristics of such wings.
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