大展弦比飞机翼身结构不同刚度对结构响应的影响

为了研究大展弦比双机身布局无人机翼身结构不同刚度对结构响应的影响,本文采用有限元分析与满应力优化相结合来探讨这一问题。计算结果表明:机翼与机身之间不同刚度对结构响应存在影响。建议结构设计时注意这一现象并加以利用,从而得到轻量化的结构设计。针对算例进一步计算与分析表明:采用本文方法得到的结构优化方案,同样也能够满足该飞机的静、动气弹要求。结论:采用本文方法,不仅可以研究飞机部件之间不同刚度对飞机结构响应的影响,还可以进行全机的结构方案设计,并对此方案进行刚度、强度、颤振和控制面效率的分析与评估。

Effects of Different Stiffness between Wing and Fuselage Structures on Structural Responses for High Aspect Ratio Airplanes

In order to deal with effects of different stiffness between wing and fuselage structures on structural responses for high aspect ratio,twin-fuselage unmanned aerial vehicle(UAV)configurations, the authors proposed an approach to exploring the problem by combining finite element method(FEM)and full stress design(FSD).Computational results showed that wing stiffness different from fuselage stiffness have effects on structural responses.This point should be considered in the design to lead to a light-weight structure design.The further computation and analysis indicated that structure optimization concepts obtained using this approach can achieve static and dynamic aero-elasticity requirements.Finally,it was concluded that this approach may be used for the study of effects of different stiffness between airframe components on structural responses,as well as the analysis and evaluation of stiffness, strength,flutter,and control surface efficiency in the conceptual design of airframe structures.