无人机大展弦比直机翼单双机身布局对结构刚度的影响

Structural stiffness effect of single & bi-fuselage UAV with higher aspect ratio and straight wing

为了探讨单、双机身布局下的大展弦比直机翼之间的结构刚度问题以及双机身大展弦比直机翼布局中基于翼面弯曲刚度下机身与机翼的最佳布置问题,采用工程梁方法对这一问题进行简化与建模。理论分析与数值优化结果表明:就结构刚度而言,双机身布局优于单机身布局;针对双机身布局,通过优化给出了机身与机翼之间的相对位置,在此工作的基础上,研究了翼面扭转刚度,并由此得出:就结构的弯曲和扭转刚度而言,双机身布局具有一定的优势。

In order to study the effect of structural bending stiffness of single ＆ bi - fuselage UAV with higher aspect ratio straight wing and the optimal layout about fuselage and wing based on wing bending stiffness on bi - fuselage aircraft with higher aspect ratio straight wing, the authors utilized the engineering beam method to model this physical problem and gave the numerical solution. Theoretical analysis and numerical result showed that bi - fuselage layout was in advantage of single one in view of structure. Through optimization the authors gave the arrangement of wing and fuselage for bi - fuselage layout. Based on above work, the wing torque stiffness was also discussed. Then we could draw a conclusion that the bi - fuselage layout had an advantage over single - fuselage layout with regard to structural stiffness （bending and torque）. Therefore, in view of UAV conceptual performance, the bi - fuselage layout was deserved to pay much attention and study.