Nonprobabilistic interval reliability analysis of wing flutter

The influences of uncertainties on the flutter behavior of aeroelastic wings were investigated. Uncertainties in the structural parameters of the wing and the natural wind speed were quantified by interval numbers. Uncertainty propagation in wing flutter was studied via interval analysis, and the interval estimation of flutter wind speed of the wing was obtained. Further, the reliability of wing flutter was analyzed based on the interval flutter-wind-speed and natural-wind-speed interference model. The ratio of the volume of the safe region to the total volume of the region associated with the variation of the basic interval variables is suggested as the measure of structural nonprobabilistic reliability. Numerical examples were used to illustrate the validity of the presented measurement.