Thickness correction by lifting surface method and its application in morphing simulation of folding wing
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摘要:
变体过程铰链力矩的计算是折叠翼飞行器设计的重要一环，现有仿真在气动建模中多采用传统的升力面法。该方法忽略了翼型厚度的影响，会产生较大的计算误差。引入一种可以考虑翼型厚度的定常高阶面元法，并给出一种采用高阶面元法对升力面法进行厚度修正的气动建模策略。将修正后的气动模型与现有多柔体结构模型及飞行控制模型耦合，对折叠翼的飞行变体过程进行仿真。结果表明：修正后的气动模型可以对翼型厚度进行有效考虑，计算所得铰链力矩误差小于5%。
Abstract:Calculating hinge moments during the morphing process is a critical link in the aircraft design with a folding wing. Existing simulations mostly use the traditional lifting surface method for aerodynamic modeling, which ignores the influence of the airfoil thickness and causes a great calculation error. This paper introduced a steady high-order panel method that considered the airfoil thickness and presented an aerodynamic modeling strategy using the high-order panel method to modify the thickness of the lifting surface method. The modified aerodynamic model was then coupled with the flexible multibody model and the flight control model to simulate the flight morphing process of a folding wing. The results show that the modified aerodynamic model can effectively consider the airfoil thickness, and the calculation error of the hinge moment is less than 5%.
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图 4 0°迎角下对称翼型折叠翼的翼面压力云图
Figure 4. Pressure distribution of folding wing with a symmetrical airfoil at an angle of attack of 0°
图 5 高阶面元法和CFD方法计算的弦向压力系数对比
Figure 5. Comparison of chordwise pressure coefficients calculated by high-order panel and CFD methods
图 11 不同气动模型仿真结果对比
Figure 11. Comparison of simulation results of different aerodynamic models
图 12 修正气动模型与CFD方法仿真结果对比
Figure 12. Comparison of simulation results between modified aerodynamic model and CFD methods
表 1 展开构型的主要几何参数
Table 1. Main geometric parameters of unfolding configuration
质量m/kg 重心坐标xcg/m 转动惯量Iy/(kg·m2) 823 (2.45, 0, 0) 5475 
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