Effect of Stiffness on Flutter of Composite Wings with High Aspect Ratio

High aspect ratio wing (HARW) structures will deform greatly under aerodynamic loads, and changes in the stiffness have a great impact on flutter characteristics of such wings. Based this, this paper presents an effective method to determine effect HARWs. calculation theory mechanical profile thin-walled structures, torsional bending are obtained through calculation. We use fluid-structure coupling analyze wing, we our research results based corotational (CR) perform structural calculations. The load is calculated using computational fluid dynamics (CFD) solver. show that, compared with original when along spanwise direction increase by 8.28% 5.22%, respectively, amplitude decreases approximately 30%. Increasing range 0.4 0.6 Mach has greater critical velocity, which increases 12.03%. aircraft’s flight speed is, more severe affects limit cycle oscillation (LCO) amplitude.