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在设计机翼时,通常需要进行多目标决策,而教练机机翼翼型选取的先验经验不足,需要进一步研究,从而得出翼型的选择规则。分析国内外已有教练机机翼翼型使用情况,运用粗糙集理论中基于重要度和条件信息熵结合的权重确定方法,提出在机翼方案设计阶段翼型的选择方法;对比分析三种分段方法在翼型性能指标离散化时的优缺点及其原因,并结合算例进行适用性验证。结果表明:在有限数据条件下,两断点方法是比较合适的属性离散化方法。所提出的方法具有使用价值,对飞机设计方案阶段翼型的选择以及机翼的气动设计具有参考意义。
In the design of the wing, usually need to make multi-objective decision-making, and trainer aircraft wings selection of a priori lack of experience, need further study to come to the airfoil selection rules. Based on the analysis of the airfoil usage of trainer aircraft both at home and abroad, the aircrew selection method based on the combination of importance and condition information entropy in rough set theory is proposed. The airfoil selection method in wing design stage is proposed. Method in the discretization of the performance index of the airfoil, its advantages and disadvantages and its causes, and with the examples of applicability verification. The results show that under the condition of limited data, the two breakpoints method is a more appropriate attribute discretization method. The proposed method has the value of use, which has reference meaning for the selection of airfoil at the stage of aircraft design and aerodynamic design of airfoil.