Aerodynamic optimization method of variant aircraft based on improved position vector expectation improvement

The aerodynamic optimization method of a variant aircraft for improving the expected improvement degree of the position vector disclosed by the invention belongs to the technical field of overall optimization of the aircraft. Select the initial reference airfoil and related shape coefficients to determine the design conditions; establish an optimization model considering structural consistency constraints to solve the shape coefficient of the deformed airfoil, and establish a high-precision aerodynamic analysis model to solve the lift coefficient and drag coefficient of the airfoil; establish The Kriging surrogate model of the high-precision aerodynamic analysis model, optimize the Kriging surrogate model to obtain a pseudo-non-dominated solution, and determine whether the prediction variance of the Kriging surrogate model is greater than the threshold; if the prediction variance is not less than the threshold, use the position vector expectation improvement criterion to obtain new samples The point is used to update the Kriging surrogate model, otherwise the new sample points are filtered from the pseudo-non-dominated solution to update the Kriging surrogate model. By filtering new sample points, the accuracy of the Kriging surrogate model at the Pareto frontier is improved, the optimality and distribution of the optimized non-dominated solution are improved, and the optimization efficiency is improved and the cost is saved.