Stochastic Modeling of Incident Gust Effects on Aerodynamic Lift

摘要

The intrusive formulation of polynomial chaos expansion is implemented to determine uncertainty innaerodynamic loads on a rigid airfoil due to imprecise parameters that characterize an incoming gust. The resultsnyield the sensitivity of the lift coefficient to variations in intensities and integral length scales of the gust fluctuations.nThe results show that lift coefficient fluctuations about the mean of each time step are affected primarily by thenintensity of the fluctuations of the vertical velocity component,which should be expected.Next in order of importancenis the integral length scale of the vertical velocity component. This implementation of the intrusive polynomial chaosnexpansion provides guidance for future efforts to quantify uncertain gust loads on micro air vehicles with highernfidelity models.