摘要
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 a new design of an aircraft wing,the multiple objective decision making is needed.But in selecting training aircraft wings’ airfoils the prior experience is insufficient,so it is needed to further study and conclude the selection rules of the wing airfoil.The airfoils used in training aircraft wings are collected and a method of airfoil selecting for wing design by using rough set theory is provided.Weight reflecting importance of each factor is the key parameter in evaluating or decision-making.The method of weight determining combining the attribute importance with conditional information entropy,which is conformed by conducting aproject of trainer wing design,is suitable for airfoil selection in wing design.The number of breaking point in discretization of parameter of airfoil is studied.It is advised that two breaking point method is preferable than one and three,when the number of airfoils in data base available is limited.The method used in this paper is believed to be useful for trainer aircraft wing’s design.
出处
《航空工程进展》
CSCD
2016年第1期87-93,111,共8页
Advances in Aeronautical Science and Engineering
关键词
翼型
教练机
粗糙集
airfoil
trainer aircraft
rough set theory
