Method for determining rigidity of flexible airfoil suitable for distributed parabola type crankshaft driving

The invention provides a method for determining the rigidity of a flexible airfoil adapting to distributed parabolic crankshaft driving. The method comprises the following steps: setting a preset condition, and giving a known quantity; obtaining a movable trailing edge centerline parabola analytic expression according to the movable trailing edge centerline parabola equation; calculating a uniaxial average driving force according to the movable trailing edge midline parabola analytic expression; substituting the bending moment equation into a deflection curve approximate differential equation,obtaining a corner equation after integration, and obtaining a corner formula according to the corner equation; determining an unknown quantity in the corner formula, and substituting the unknown quantity into the corner formula to obtain the elastic modulus of the flexible skin; and determining the rigidity of the flexible airfoil according to the elastic modulus. The method for determining therigidity of the flexible a