基于径向基函数的机翼二维气动代理模型设计

2D surrogate model of wing lift distribution based on radial basis function

采用多学科设计优化方法进行机翼气动/结构优化时,结构学科的优化需要气动学科提供机翼压力分布的代理模型。本文引入了等参单元形函数的几何变换思想,利用径向基函数,解决了复杂形状机翼的二维气动代理模型的构造问题,进行了某巡航导弹弹翼考虑结构变形的气动力代理模型的构建。算例结果表明,本文所用代理模型构造方法简单易行,预测结果的精度很好。

Surrogate model is used to provide approximate objective value by replacing time-consuming simulation evaluations or experiments. A new method to obtain 2D surrogate model of wing lift distribution was proposed in this paper based on geometry transformation and radial basis function. The geometry transformation of wing was conducted by means of shape function born of finite element method. The process of aerodynamic lift surrogate model build of a wing with arbitrary geometry was introduced. An example of aerodynamic lift surrogate model for a missile wing was made, in which the bending and torsional deformation of wing was included. The wing lift distribution was computed by CFD software MGAero. It is demonstrated that the results predicted by surrogate model is coherent with the one given by CFD simulation, and that the presented method is suitable and easy for surrogate model build.